MOSTAR AIRFRAME PLANT SOKO AND MOSTAR/SOKO AIRFIELD

• Document Type: CREST
• Collection: NGA Records (Formerly NIMA)
• Document Number (FOIA) /ESDN (CREST): CIA-RDP80T01355A000100880001-1
• Release Decision: RIPPUB
• Original Classification: T
• Document Page Count: 15
• Document Creation Date: December 28, 2016
• Document Release Date: October 14, 2010
• Sequence Number: 1
• Publication Date: July 1, 1980
• Content Type: REPORT

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basic Imagery interpretation report
Mostar Airframe Plant Soko and
Mostar/Soko Airfield (S)
STRATEGIC WEAPONS INDUSTRIAL FACILITIES
BE: Various
YUGOSLAVIA
Top Secret
Top Secret
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JULY 1980 25X1
Copy 49
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Mostar Airframe Plant Soko and Mostar/Soko Airfield
GEOGRAPHIC COORDINATES
43-18-40N 017-48-08E
43-18-06N 017-48-42E
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1. (S/D) This is the initial NPIC basic report on Mostar Airframe Plant Soko, Yugoslavia, and the
collocated Mostar/Soko Airfield, the primary test and flyaway field for the plant. The basic reporting require-
ment for this target is satisfied by this report. As of ostar Airframe Plant Soko consisted of 84 25X1
buildings and structures with a total floorspace of 122,466 square meters. An additional 3,914 square meters of
floorspace were under construction. Mostar/Soko Airfield consisted of 69 buildings and structures with a total
floorspace of 58,565 square meters. An additional 1,018 square meters of floorspace were under construction.
2. (S/D) A description of both Mostar Airframe Plant Soko and Mostar/Soko Airfield: a construc-
tion chronology; and aircraft production, assembly, and repair activity at both facilities are provided in
this report. This report also contains a location map, three annotated photographs, six small-format
photographs, two tables of mensural and chronological data, a table of aircraft observations, and a chart
illustrating production activity at the plant.
3. (S/D) Mostar Airfield, the secondary test and flyaway field for the plant, is also discussed briefly
in this report.
4. (S/D) Mostar Airframe Plant Soko and Mostar/Soko Airfield (Figure 1) occupy an area of
approximately 223.2 hectares, 4 nautical miles (nm) south of Mostar. These facilities are on relatively flat
ground in the western floodplain of the Neretva River. The Mostar area has a generally mild climate and
receives sparse rainfall. Future plant expansion is possible to both the north and west but would require
the displacement of a small civilian population.
5. (S/D) Mostar Airframe Plant Soko (Figure 2) consists of four basic facilities-a fabrication
facility, Mostar Airframe Plant Soko proper; a primar test and flyaway field, Mostar/Soko Airfield; a
secondary test and flyaway field, Mostar Airfield and a concrete taxiway connecting the 25X1
fabrication area and Mostar Airfield. Since Mostar Airfield is only peripherally related to aircraft prod-
uction activity, it is mentioned only briefly.
6. (S/D) Mostar Airframe Plant Soko (Figure 3) is secured by a 3-meter-high fence. Entrance to the
plant is restricted to three vehicle/pedestrian entrances and one aircraft (taxiway) entrance.
General Description
7. (S/D) Mostar Airframe Plant Soko (Figure
3) occupies an area of 36.9 hectares and consists of 84
buildings and structures of which 82 (Table 1) are
considered to be significant. The plant consists of a
separately secured administration/engineering area
and a separately secured fabrication area.
8. (S/D) The administration/engineering area
(Figure 3 and Table 1) occupies the extreme eastern
portion of the plant and is separated from the
fabrication area by a wall. The area contains 12
significant buildings-two administration/engineering
buildings (items 3 and 4), four engineering buildings
(items 2 and 8 through 10), a shop building (item 11),
a vehicle storage/maintenance building (item 1), and
four apartment buildings (items 5 through 7 and 12).
9. (S/D) The fabrication area occupies the
major part of the plant and contains 72 buildings
and structures; 70 are considered to be significant.
There are four administration/engineering build-
ings (items 30, 31, 43, and 51), two final assembly
buildings (items 60 and 79), six fabrication/assem-
bly buildings (items 18, .37, 50, 52, 55, and 61), five
subassembly buildings (items 39, 40, 46, 48, and
67), three engineering/shop buildings (items 17, 47,
and 69), six shop buildings (items 24, 41, 45, 68, 71,
and 75), an engine test building (item 65), a rotor
test facility (item 63), a steam/heating plant (item
66), a compressor building (item 42), an aircraft
checkout apron (item 80), a communication build-
ing (item 14), five security buildings (items 15, 16,
21, 26, and 27), a dispatch office (item 23), a
dispensary (item 20), a vehicle maintenance build-
ing (item 44), three vehicle storage buildings (items
13, 22, and 28), a covered work area (item 19), 17
storage buildings (items 25, 29, 32 through 36, 38,
49, 56 through 59, 70, 72, 73, and 76), four support
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buildings (items 53, 54, 62, and 64), and five build-
ings under construction (items 74, 77, 78, 81, and
82).
10. (S/D) As of I I(the informa-
tion cutoff date for this report), the plant con-
tained approximately 122,466 square meters of us-
able floorspace with an additional 3,914 square
meters under construction. A functional break-
down of this floorspace is presented in the follow-
ing table.
ity consisting of an oval track and two troop obsta-
cle courses.
14. (S/D) The housing and recreation area is
southwest of the administration and security area. 25X1
The area contains 16 buildings and structures; 15
buildings are considered to be significant. These
include three administration buildings (items 10,
14, and 21), two officers' quarters (items 8 and 12),
three barracks (items 9, 11, and 13), a messhall
(item 15), a chapel (item 16), a laundry (item 22), a
Administration/engineering
28,508
23.3
Fabrication/assembly
65,425
53.4
Direct support
15,954
13.0
General support
12,579
10.3
Current floorspace
122,466
100.0
Under construction
3,914
Total projected floorspace
126,380
11. (S/D) Mostar/Soko Airfield occupies an
area of 186.3 hectares and comprises 69 buildings
and structures. Sixty-one of these buildings are
considered to be significant. Flight support facili-
ties at the airfield (Figure 4) includes a 1,492- by
5I-meter, north-northeast/south-southwest, servi-
ceable sod runway, delineated by corner and side
markers, a light-aircraft parking apron; a helicop-
ter checkout apron; and a compass rose. No elec-
tronic navigational aids were at the airfield. The
airfield consists of four functional areas-an explo-
sives storage area, an administration and security
area, a housing and recreation area, and a prod-
uction support and repair area.
12. (S/D) The explosives storage area (Fig-
ure 4 and Table 2) contains three explosives stor-
age buildings (items I through 3) and is separately
fence-secured. Access is restricted by a swing gate
on the south edge of the area.
13. (S/D) The administration and security
area occupies the northwest corner of the airfield
and contains five buildings. Four are considered to
be significant-two administration buildings (items
4 and 6) and two security buildings (items 5 and 7).
All vehicular and pedestrian traffic entering the
airfield must pass through this area. The eastern
portion of this area supports a troop training facil-
recreation center (item 19), a shower/dressing
room (item 17), a support building (item 20), and a
building under construction (item 18). Recreation-
al facilities in this area include an oval track, six
basketball courts, two tennis courts, a volleyball
court, a swimming pool, and three troop obstacle
courses.
15. (S/D) The production support and re-
pair area contains 46 buildings. Of the 46, 39
buildings are considered to be significant. These
include three administration buildings (items 42,
43, and 45), four engineering buildings (items 29,
30, 35, and 36), two checkout/paint hangars (items
49 and 56), an electronic checkout and repair hang-
ar (item 37), seven checkout/repair hangars (items
23 through 28 and 31), two repair hangars (items
57 and 61), two shop buildings (items 32 and 38),
an engine run-up building (item 44), an operations
building (item 34), three weapons storage buildings
(items 58 through 60), a messhall (item 48), two
vehicle maintenance buildings (items 50 and 51),
four vehicle storage buildings (items 40, 41, 54, and
55), a POL storage building (item 52), three storage
buildings (items 39, 46, and 47), and two support
buildings (items 33 and 53). A troop training area at
the south end of the airfield consists of a chemical,
biological, and radiological dosimetric training facil-
ity and numerous field firing positions for both
antiaircraft and field artillery.
FIGURE 1. LOCATION OF MOSTAR AIRFRAME PLANT SOKO AND MOSTAR/SOKO AIRFIELD, YUGOSLAVIA
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16. (S/D) As of Mostar/-
Soko Airfield contained approximately 58,565
square meters of floorspace with an additional
1,018 square meters under construction. Mostar/-
Soko Airfield serves as the primary test and
flyaway airfield for all fixed-wing, propeller-driven
aircraft and helicopters produced at Mostar Air-
frame Plant Soko. The airfield is also the preflight
checkout facility for all aircraft produced at the
plant. Further details of activity at this airfield will
be discussed later in this report.
17. (S/D) Mostar Airfield is on the eastern
floodplain of the Neretva River, 2 nm southeast of
Mostar Airframe Plant Soko (Figure 2), and is
connected to the plant by a concrete taxiway. The
airfield is the secondary test and flyaway field for
all jet-engined aircraft produced at the plant.
However, since Mostar Airfield also houses an
operational Yugoslav Air Force (YAF) fighter-
Top Secret
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bomber squadron and two helicopter training
squadrons,' this airfield was not considered, for
purposes of this report, to be an operational part
of Mostar Airframe Plant Soko. Mostar Airfield
has a 2,393- by 46-meter, northwest/southwest,
serviceable concrete runway and has limited elec-
tronic navigational aids.
Construction Chronology
Mostar Airframe Plant Soko
18. (S/D) The earliest available coverage of
Mostar Airframe Plant Soko was aircraft photog-
raphy of At that time, the plant
consisted of 18 major buildings with a total floor-
space of 42,500 square meters. Buildings observed
in the administration/engineering area (Figure 3
and Table 1) were two administration/engineering
(Continued p. 8)
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16. (S/D) As of Mostar/-
Soko Airfield contained approximately 58,565
square meters of floorspace with an additional
1,018 square meters under construction. Mostar/-
Soko Airfield serves as the primary test and
flyaway airfield for all fixed-wing, propeller-driven
aircraft and helicopters produced at Mostar Air-
frame Plant Soko. The airfield is also the preflight
checkout facility for all aircraft produced at the
plant. Further details of activity at this airfield will
be discussed later in this report.
17. (S/D) Mostar Airfield is on the eastern
floodplain of the Neretva River, 2 nm southeast of
Mostar Airframe Plant Soko (Figure 2), and is
connected to the plant by a concrete taxiway. The
airfield is the secondary test and flyaway field for
all jet-engined aircraft produced at the plant.
However, since Mostar Airfield also houses an
operational Yugoslav Air Force (YAF) fighter-
Top Secret
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bomber squadron and two helicopter training
squadrons,' this airfield was not considered, for
purposes of this report, to be an operational part
of Mostar Airframe Plant Soko. Mostar Airfield
has a 2,393- by 46-meter, northwest/southwest,
serviceable concrete runway and has limited elec-
tronic navigational aids.
Construction Chronology
Mostar Airframe Plant Soko
18. (S/D) The earliest available coverage of
Mostar Airframe Plant Soko was aircraft photog-
raphy of At that time, the plant
consisted of 18 major buildings with a total floor-
space of 42,500 square meters. Buildings observed
in the administration/engineering area (Figure 3
and Table 1) were two administration/engineering
(Continued p. 8)
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Top Secret RUFI
16. (S/D) As of Mostar/-
Soko Airfield contained approximately 58,565
square meters of floorspace with an additional
1,018 square meters under construction. Mostar/-
Soko Airfield serves as the primary test and
flyaway airfield for all fixed-wing, propeller-driven
aircraft and helicopters produced at Mostar Air-
frame Plant Soko. The airfield is also the preflight
checkout facility for all aircraft produced at the
plant. Further details of activity at this airfield will
be discussed later in this report.
17. (S/D) Mostar Airfield is on the eastern
floodplain of the Neretva River, 2 nm southeast of
Mostar Airframe Plant Soko (Figure 2), and is
connected to the plant by a concrete taxiway. The
airfield is the secondary test and flyaway field for
all jet-engined aircraft produced at the plant.
However, since Mostar Airfield also houses an
operational Yugoslav Air Force (YAF) fighter-
Top Secret
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bomber squadron and two helicopter training
squadrons,' this airfield was not considered, for
purposes of this report, to be an operational part
of Mostar Airframe Plant Soko. Mostar Airfield
has a 2,393- by 46-meter, northwest/southwest,
serviceable concrete runway and has limited elec-
tronic navigational aids.
Construction Chronology
Mostar Airframe Plant Soko
18. (S/D) The earliest available coverage of
Mostar Airframe Plant Soko was aircraft photog-
raphy of At that time, the plant
consisted of 18 major buildings with a total floor-
space of 42,500 square meters. Buildings observed
in the administration/engineering area (Figure 3
and Table 1) were two administration/engineering
(Continued p. 8)
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Top Secret RUFF
Table 2.
Structures, Dimensions, and Construction Chronology at Mostar/Soko Airfield
(Items keyed to Figure 4)
This table in its entirety is classified TOP SECRET R UFF
Item Description
Dimensions*
(m)
L W H
Total Date rust Date
Floorspace Observed Observed
(sq m) Ucon Complete
Remarks
Item Description
Dimensions
(m)
L W H
Total Date first Date
Floorspace Observed Observed
(sq m) Ucon Complete
Remarks
Explosives Storage Area
1 Stor bldg
171 **
Revetted
34 Ops bldg
165 **
2 Stor bldg
178 **
Revetted
35 Engr bldg
795 **
2 stories
3 PUG stor bldg
91 **
36 Engr bldg
1,215
Has 2 internal
Administration and Security Area
courtyards
37 Electronic checkout
4 Admin bldg
1,105 **
3 stories
and repair hangar
5 Security bldg
231 **
Height
a Hangar sect
1,092 **
Taxiway to Compass
undet
Rose
6 Admin bldg
540 **
2 stories
b Shop sect
936 **
7 Security bldg
31 **
c Shop sect
932 **
Housing and Recreation Area
d Engr
sect
755 **
2 stories
38 Stor bldg
934
8 Officers' qtrs
558 **
39 Stor bldg
722 **
Floorspace includes
9 Barracks
2,614 **
3 stories
a small annex
10 Admin bldg
2,838 **
4 stories
40 Veh stor bldg
506 **
11 Barracks
2,763 **
3 stories
41 Veh stor bldg
441 **
12 Officers' qtrs
573 **
42 Admin bldg
220 **
13 Barracks
2,419 **
2 stories; center
43 Admin bldg
482 **
sect is 3
44 Engine run-up
106 **
Concrete pad im-
stories
bldg
mediately to the
14 Admin bldg
1,944 **
2 stories;
north
one small sect
45 Admin bldg
240 **
4 stories
is 3 stories
46 Star bldg
319 **
15 Messhall
726 **
47 Star bldg
148 **
16 Chapel
41 **
48 Messhall
306 **
17 Shower/dressing room
174 **
Serves swimming
49 Checkout/paint
For helicopters
pool & tennis
hangar
courts
a Hangar sect
1,517 **
18 Bldg ucon
(1,018)
Ucon, foundation
b Hangar sect
1,523 **
only; may event-
c Shop sect
172 **
ually be a swim-
d Shop sect
112 **
ming pool
50 Veh maint bldg
19 Recreation center
a Veh maint sect
618 **
a Gymnasium
397 **
b Shop sect
363 **
b Theater
420 **
51 Veh maint bldg
c Gymnasium
402 **
a Veh maint sect
623 **
d Shower/dressing room
186 **
b Shop sect
361 **
20 Spt bldg
436 **
52 POL stor bldg
337 **
Drum star
21 Admin bldg
3,384 **
3 stories; floors ace
53 Spt bldg
32 **
54 Veh stor bldg
667 **
55 Veh stor bldg
659 **
22 Laundr
517 **
56 Ch
k
t/
i
t
y
ou
pa
n
ec
Production Support and Repair Area
hangar
a Hangar sect
1,505 **
For helicopters
23 Checkout/repair
961 **
b Hangar sect
1,520 **
hangar
c Paint shop
307 **
24 Checkout/paint
d Paint shop
291 **
hangar
57 Repair hangar
a Hangar sect
3,254 **
For fixed-wing
a Hangar sect
578 **
aircraft
b Hangar sect
570 **
b Paint shop
314 **
c Shop sect
181 **
c Paint shop
307 **
d Shop sect
167 **
25 Checkout/repair
640 **
58 Weapons stor bldg
495 **
Artillery star;
hangar
quonset
26 Checkout/repair
906 **
59 Weapons stor bldg
467 **
Artillery stor;
hangar
quonset
21 Checkout/repair
894 **
60 Weapons star bldg
432 **
Small arms
hangar
61 Repair hangar
28 Checkout/repair
625 **
a Hangar sect
910 **
hangar
b Hangar sect
907 **
29 Engr bldg
238 **
c Shop sect
142
30 Engr bldg
246 **
d Shop sect
151
31 Checkout/repair
884 **
Unnumbered bldgs
Various
120 -
8 sheds
hangar
Total usable toorspace o
58,565
32 Shop bldg
905 **
0
Floorspace ucon on
1,018
33 Spt bldg
18 **
Control tower at
Total projected Iloorspace
59,583
SE corner is
**Complete when first observed.
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AIRCRAFT
TYPE 522
SIKORSKY S-55
GALEB/JASTREB
SOKO KRAGUJ
GAZELLE
PROTOTYPE AND
PRESERIES PRODUCTION
PERIOD OF PRODUCTION
J',PIC S-9256
(ASSEMBLY)
1954 56 58 60 62 64 66 68 70 72 74 76 78 80
I II I
55 57 59 61 63 65 67 69 77 73 75 77 79
FIGURE 5. AIRCRAFT PRODUCTION ACTIVITY AT MOSTAR AIRFRAME PLANT 501(0
FIGURE 6. YUGOSLAVIAN TYPE 522 AIRCRAFT
FIGURE 7.62?A CALEB AIRCRAFT
FIGURE 8. J?1 JASTREB AIRCRAFT
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CS-9258
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buildings (items 3 and 4), two engineering build-
ings (items 2 and 9), and four apartment buildings
(items 5 through 7 and 12). Buildings seen in the
fabrication area included an engineering building
(item 31c; now administration/engineering), a final
assembly building (item 60a and b), five fabrica-
tion/assembly buildings (items 37a, 48a, 50a, 52a,
and 55e), a shop building (item 68), the engine test
building item 65), and the steam/heat plant (item
66a). On approximately 78 percent
of the total plant floorspace was related to fabrica-
tion/assembly, as opposed to the present 53.4
percent.
19. (S/D) Construction between 1957 and 1967
increased the total plant floorspace by 15,957 square
meters, a 37.5 percent increase since
Construction during this period resulted in the com-
pletion of an engineering building (item 8), a shop
building (item 11), and the vehicle storage/mainten-
ance building (item 1) in the administration/engineer-
ing area. Buildings completed in the fabrication area
were two subassembly buildings (items 40 and 67a),
an engineering/shop building (item 47), a shop build-
ing (item 24), the dispensary (item 20), and a vehicle
storage building (item 13). By the end of this period,
the proportion of floorspace which was fabrication/-
assembly related had dropped to 63.1 percent.
20. (S/D) Construction between 1968 anti 1977
increased the total plant floorspace by 42,501 square
meters, a 72.7 percent increase. One engineering
building (item 10) was completed in the administra-
tion/engineering area. In the fabrication area, a final
assembly building (items 60c and d), four fabrica-
tion/assembly buildings (items 37b, SOc and d, 52c,
and 55d), an administration building (items 31b and
c), the steamplant (item 66b, c, and d), and two
subassembly buildings (items 67c and 40b, c, and d)
were all enlarged or expanded. New buildings con-
structed consisted of two fabrication/assembly build-
ings (items 18 and 61), three administration/engineer-
ing buildings (items 41, 45, 71, and 15), the rotor test
facility (item 63), a vehicle maintenance building (item
44), a communications building (item 14), five securi-
ty buildings (items 15, 16, 21, 26, and 27), the
dispatch office (item 23), a vehicle storage building
(item 22), a covered work area (item 19), 12 storage
buildings (items 29, 32 through 36, 38, 56 through 59,
and 72), and three support buildings (items 53, 54,
and 62). By the end of this period the proportion of
fabrication/assembly floorspace in the fabrication
area had been reduced to 54.6 percent.
21. (S/D) Construction between
esulted in an increase of
21,508 square meters of floorspace or 21.3 percent.
Existing buildings with new additions were an ad-
ministration/engineering building (item 30b), four
fabrication/assembly buildings (items 37b and d,
Sob, 52b, and 55b, c, and d), and a subassembly
building (item 67b and c). New buildings con-
structed during this period were a final assembly
building (item 79), a subassembly building (item
46), an engineering/shop building (item 69), a com-
pressor building (item 42), a vehicle storage build-
ing (item 28), six storage buildings (items 25, 38,
57, 58, 70, and 76), and a support building (item
64). A new aircraft checkout apron (item 80) was
also completed.
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22. (S/D) As of an engineer-
ing section (item 37c) to a fabrication/assembly
building, a shop section (item 55f) to a fabrica-
tion/assembly building, and five unidentified
buildings (items 74, 77, 78, 81, and 82) were still
under construction. The completion of this con-
struction will add 3,914 square meters of usable
floorspace.
Mostar/Soko Airfield
23. (S/D) The earliest available coverage of
Mostar/Soko Airfield was also aircraft photogra-
phy of At that time, the airfield
consisted of 28 buildings and structures with a
total floorspace of 35,168 square meters, 60 per-
cent of the current floorspace. Buildings and struc-
tures observed on were two admin-
istration buildings (items 4 and 6, Figure 4 and
Table 2) in the administration and security area;
two barracks (items 9 and 11) and an officers'
quarters (item 8) in the housing and recreation
area: and an administration building (item 45), two
engineering buildings (items 29 and 30), a shop
building (item 38), the electronics checkout and
repair hangar (item 37), seven checkout/repair
hangars (items 23 through 28 and 31), two check-
out/paint hangars (items 49 and 56), two repair
hangars (items 57 and 61), the operations building
(item 34), two vehicle maintenance buildings (items
50 and 51), and two vehicle storage buildings (items
54 and 55) in the production support and repair area.
24. (TSR) Three buildings-two storage
buildings (items I and 2) in the explosives storage
area and the engine run-up building (item 44) in
the production support and repair area-were
constructed between 1957 and 1967, adding 455
square meters of floorspace. The completion of
these buildings added 1.3 percent to the total
floorspace at the airfield.
25. (S/D) Thirty-seven buildings were com-
pleted and three buildings were enlarged between
1968 and 1977, resulting in the addition of 22,942
square meters of floorspace, a 64.4 percent increase.
Twenty-nine significant buildings were completed
during this period. In the explosives storage area, one
partially underground (PUG) storage building (item
3) was completed. In the administration and security
area, two security buildings (items 5 and 7) were
completed. In the housing and recreation area, three
administration buildings (items 10, 14, and 21), a
barracks (item 13), an officers' quarters (item 12), a
FIGURE 9. YUGOSLAVIAN SOKO KRAGUJ AIRCRAFT
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Top Secret
messhall (item I5), a laundry (item 22), a shower/-
dressing room (item 17), and a support building (item
70) were completed. In the production support and
repair area, two administration buildings (items 42
and 43), two engineering buildings (items 35 and 36),
a shop building (item 32), a messhall (item 48), three
weapons storage buildings (items 58 through 60), a
POL storage building (item 52), two vehicle storage
buildings (items 40 and 41), three storage buildings
(items 39, 46, and 47), and two support buildings
(items 33 and 53) were completed. Additionally, three
buildings were enlarged during this period. Two shop
sections (items 49c and d) were added to a checkout/-
paint hangar, and two shop sections were added to
each of the two repair hangars (items 57c and d and
61c and d).
26. (S/D) Construction observed after 1977
was limited to one building in the housing and
recreation area which was under construction on
When complete, this building will
add at least 1,018 square meters of floorspace,
bringing the airfield total to 59,583 square meters.
Plant Activity
27. (S/D) Mortar Airframe Plant Soko has a
long and varied association with the Yugoslavian
aviation industry. The plant was constructed in
1951 and incorporated three previously separate
corporations, the Rogojarsky, Ikarus, and Zmaj
organizations.' Full-scale aircraft production be-
gan in early 1957 (Figure 5) with the Type 522.
This program was followed by assembly of the
Sikorsky S-55 helicopter, production of the indige-
nous GALEB/JASTREB and SOKO KRAGUJ
aircraft, and assembly of the SA-341 GAZELLE
helicopter. Each of these programs is discussed
separately below.
28. (S/D) The identification of recently pro-
duced aircraft at the plant was hampered by the
diversity of activities occurring at both the air-
frame plant and at Mostar/Soko Airfield. Obser-
vations of aircraft within the security of the plant
were rare. Most aircraft activity observed was at
Mostar/Soko Airfield. Identification of production
aircraft was difficult because of aircraft repair
activity and YAF technical and maintenance train-
ing at Mostar/Soko Airfield. Photographic evi-
dence indicates that Mostar/Soko Airfield houses
both a YAF aircraft maintenance training unit and
a Yugoslav Army artillery training unit. Addition-
ally, the aforementioned YAF flight training units
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at Mostar Airfield use the sod runway at Mostar/-
Soko Airfield for natural-surface landing and take-
off training. However, photographic observations
of equipment and activities do not reflect prod-
uction activity at the plant. Aircraft which were
often seen at Mostar/Soko Airfield (Table 3) and
may not be production or repair related included
the indigenous CIJAN KURIR, GALEB/JAS-
TREB, UTVA-60/-66, SOKO KRAGUJ, Aero-3,
and UTVA-65. Soviet aircraft commonly observed
included the LI-2 (CAB) and MI-2 (HOPLITE).
Two models of US aircraft (the T-33 and F-84G
thunderjet) used for maintenance training are per-
manently stationed at Mostar/Soko Airfield.
Ground forces equipment commonly observed in-
cluded the 20mm antiaircraft (AA) gun M-55
(Swiss HSS-804), the ZPU-2 and ZPU-4 AA heavy
machine guns, the 57mm AA gun S-60, the 76mm
mountain gun M-48, and the 120mm mortar M-52.
Aircraft Production and Assembly Programs
29. (S/D) Type 522. The first aircraft to be
mass produced at Mostar was the Type 522, designed
by Sima Milutinovoc. A tandem two-seat advanced
trainer, the Type 522, was the most widely used
trainer in the YAF until it was replaced in the early
1960s with the GALEB. The Type 522 (Figure 6) is a
low-wing, single-engine monoplane powered by a 600-
horsepower, Pratt/Whitney, R-1340-AN-1 Wasp
nine-cylinder radial air-cooled engine and was the
first Yugoslav all-metal production aircraft. For gun-
nery training, the Type 522 carries two 7.9mm ma-
chine guns, but for tactical roles it can be fitted with
four 50- or 100-lb bombs or two 5-inch HVAR mis-
siles.' The number of Type 522 produced at the
Mostar plant is not known. However, one Type 522-
equipped ground-attack squadron is still operational
at Ljubljana International Airfield
and as many as 12 have been observed at Mostar/-
Soko Airfield (Table 3) on a single coverage. It is
estimated that production of the Type 522 began in
early 1957 and ended by late 1961. Based on known
production rates of other aircraft at Mostar and given
the probable 5-year production span of the Type 522,
it is possible that as many as 120 of the aircraft were
produced.
30. (S/D) Sikorsky S-55. Only limited informa-
tion is available concerning the assembly of the Sikor-
sky S-55 helicopter at Mostar in the early 1960s. One
FIGURE 11. JUROM (ORAO) WITH YUGOSLAV MARKINGS
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estimate suggests that assembly, mostly from foreign
parts, began in mid-1960 and ended in mid-1963 with
50 to 60 having been assembled.' However, since the
S-55 has virtually been supplanted by the Soviet MI-8
(HIP) in the YAF inventory,' no accurate count of S-
55s is possible. Two S-55s were observed at Mostar/-
Soko Airfield (Table 3), one each on and 25X1
long after assembly had ended.
31. (S/D) GALEB/JASTREB.* The best
known of all the Yugoslavian aircraft, the Soko G-2A
GALEB (Figure 7), is a subsonic two-seat basic/ad-
vanced jet trainer. The GALEB has been widely
acclaimed at International air shows and has proven
to be a popular export aircraft (designated G-2A-E),
competitive with the BAC Strikemaster and the
Macchi MB 326G.4 The first GALEB prototype was
designed in 1957 at the Military Technical Institute in
Zarkovo (Zarkovo Air Research Institute, BE 25X1
near Belgrade.' Two prototypes were com- 25X1
pleted in 1959 at Mostar.5 After many flight tests,
series production was begun in early 1963, and by the
end of 1979, at least 240 GALEBs had been produc-
ed,6 most of them at Mostar. The estimated 1979
production rate for the GALEB was one per month.
However, no GALEB/JASTREB have been observed
at Mostar since (Table 3) but have been
observed at Batajnica Aircraft Assembly Plant (BE
indicating that all GALEB/JASTREB
assembly has been transferred to Batajnica. It is
probable, however, that most of the GALEB/JAS-
TREB components necessary for assembly are still
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Table 3.
Aircraft Observations at Mostar Airframe Plant Soko and Mostar/Soko Airfield*
This table in its entirety is classified TOP SECRET RUFF
Combat Aircraft Rotary Wing Aircraft Utility Aircraft
Date Mission** GALEB/ SOKO Type GAZELLE Sikorsky CIJAN t1TVA- Miscellaneous
JASTREB KRAGUJ 522 S-55 KURIR 60/66 Aircraft
10 2
10
8 2 2
5
2
1
12
2 I 6
2
3
*Excluding maintenance training aircraft (T-33 and F-84G).
**All available coverages of sufficient quality.
I Acro-3
I HOPLITF.
I CAB
I CAB & I
HOPLITF.
I CAB & I
HOP1.ITF.
ICAB
I CAB
ICA B
I JUROM
I CAB & I
HOPLITE
I CAB
2 1 CAB
ICA B
ICA B
I CAB
ICA B
ICA B
I CAB & I HIP C
I CAB & I
UTVA-65
2 ICAB& I
UTVA-65
I CAB
I CAB
ICA B
I CAB
ICA B
I CAB
I CAB
ICA B
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produced at Mostar. The Soko J-I JASTREB pro-
gram was begun in 1962, and series production was
initiated at Mostar in 1967.6 The JASTREB (Figure
8) is a single-seat attack/counterinsurgency version of
the GALEB. While the GALEB is powered by a
Rolls-Royce Viper 11 (NK 22-6) turbojet engine, the
JASTREB is equipped with a more powerful Rolls-
Royce Viper 531 engine. Three versions of the
JASTREB are the export version (J-I-F), a reconnais-
sance version (RJ-1), and a two-seat trainer version
(TJ-1). An exact version of the RJ-I, designated RJ-I-
F, is for export. By the end of 1979, at least 170
JASTREB had been produced,6 mostly at Mostar.
Like that of the GALEB, however, JASTREB prod-
uction has evidently been transferred to Batajnica
Aircraft Assembly Plant.'
32. (S/D) SOKO KRAGUJ. The SOKO
KRAGUJ (Figure 9) is a single engine, low-wing
monoplane powered by a Lycoming GSO-480-
B I A6 engine. It was designed as a ground-attack
aircraft with sod field capabilities. The SOKO
KRAGUJ has two underwing pylons for bombs up
to 220 pounds, cluster bombs, napalm tanks, or
rocket pods. There are also four additional hard-
points for 57mm or 127mm air-to-surface rockets.
Each wing houses an internal 7.7mm, 650-round,
machine gun.' Production of the SOKO KRAGUJ
(Figure 5) began at Mostar in 1967 and ended in
1970: an estimated 40 SOKO KRAGUJ were
produced.', One ground-attack squadron, equipped
with SOKO KRAGUJ, remains in operation at
Cerklje Airfield
33. (S/D) SA-341 GAZELLE. Licensed assem-
bly of the French SA-341 GAZELLE, using French
components, began at Mostar in 1973.1, The first
GAZELLE was observed at the plant on overhead
photography of Table 3). By the end of
1979, approximately 85 GAZELLE had been assem-
bled. The GAZELLE (Figure 10) is a five-seat, light
utility helicopter powered by a Turbomeca Astazou
ILIA turboshaft engine. Armament options include
rocket pods, wire-guided missiles, machine guns,
flares, and smoke markers.' The GAZELLE is also
being assembled at Batajnica Aircraft Assembly
Plant.'
34. (S/D) In addition to powered aircraft,
towed gliders (Table 3), small rowboats, refrigerators,
and automobile parts are also produced at Mostar
Airframe Plant Soko. All these items are produced in
limited numbers from spare materials at sporadic
intervals. It is also likely that the bulk of the
components supporting the GALEB/JASTREB as-
sembly activity at Batajnica Aircraft Assembly Plant
are produced at Mostar.'
Aircraft Repair Activity
35. (S/D) Observations of the Type 522 and
SOKO KRAGUJ aircraft (Table 3) at Mostar/-
Soko Airfield suggest that both of these aircraft
are being repaired at the airfield. Both typically
appear in fairly large numbers from eight to 12,
indicating that approximately one-third to one-half
of an operational squadron is serviced/repaired at
a time. As previously indicated, one operational
squadron of each aircraft is currently in service.
Occasionally CIJAN KURIR, UTVA-60/-66, Aero-3,
and HOPLITE were observed at the airfield suggest-
ing that these aircraft may also be repaired at the
airfield in limited numbers. Additionally, it is likely
that occasional GALEB/JASTREB are returned to
the plant for periodic overhaul.
Aircraft Programs Under Development
36. L___
ROM (Orao).
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The first Orao prototype was observed on overhead
photography at Batajnica Airfield
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*The term GALES/JASTRFB is used collectively in this report since the several versions of these aircralt are virtually indistinguishable on
overhead photography.
Small-Format Imagery
Figure No Source*
6 The Aircraft of the World, MacDonald & Co, London, 1965
7 Aviation Week & Space Technology, 8 Apr 68
8 Aviation Week & Space Technology, 8 Apr 68
9 A viation Week & Space Technology, 8 Apr 68
10 Jane's All the World's Aircraft, 1978- 1979
11 Front Magazine, Belgrade, Yugoslavia, 9 May 75
*All sources are UNCLASSIFIED.
MAPS OR CHARTS
DMA. US Air Target Chart, Series 200, Sheet 0321-5, scale 1:200,000 (UNCLASSIFIED)
DOCUMENTS
I. DIA. DDB-1300-101A-79, Air Order of Battle (AOB) volume I-USSR and Eastern Lurope II u, Mar 79
(SECRET)
2. FLIGHT International, 28 Nov 68, pp 901 -905 (UNCLASSIFIED)
3. MacDonald & Co., The Aircraft of the World, London, 1965 (UNCLASSIFIED)
4. Dot). IIR 6-904-5045-80, Yugoslav Military Aircraft 'Galeh,'' 4 Mar 80 (UNCLASSIFIED)
5. Front Magazine, Belgrade, Yugoslavia, 22 Feb 80 (UNCLASSIFIED)
6. DI A. DDB-1923-2A-79-SAO, Foreign
58-59 (TOP SECRET
7. NPIC.
IAR-0014/80, Batajnica Aircraft Assembly Plant, Jugoslavia (.S). Mar 80 (TOP
SECRET I
8. Jane 'ss A11 The World's Aircraft, 1978-1979 (UNCLASSIFIED)
9. CIA/NFAC. SC-01198/80, SR M 80-10014C, Yugoslavia: Problems with Militar.i Aircraft Productioti, 17 Jan 80
10. NPIC.
CA-09/0016/78, Sarajevo Aircraft Engine Plant Rajlovac (S), Jun 78 (TOP
11 DIA. Defense Intelligence Notice 68-3S, Yugoslavia: Aircraft Output Declines ICI. 1003321, 9 Mar 79 (TOP
SECRET=
12. DOD. IIR 1-521-0086-78, Alleged Development of New Indigenous Helicopter (1.). 6 Feb 78 (SECRET
*Extracted material is classified SECRET.
**Extracted material has been decompartmented and is classified SECRET/WNINTEL.
COMIREX J02
Project 200027DJ
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(S) Comments and queries regarding this report are welcome. They may be directed to Warsaw 25X1
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