JT11D-20 ENGINE PROGRAM REVIEW

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP67B00511R000100110087-4
• Release Decision: RIPPUB
• Original Classification: S
• Document Page Count: 6
• Document Creation Date: December 14, 2016
• Document Release Date: November 20, 2002
• Sequence Number: 87
• Publication Date: July 25, 1961
• Content Type: MF

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OXC - 1986
Copyjof 6
25 July 1961
SUBJECT : JT11D-20 Engine Program Review
REFERENCE : (a) OXC-1823 dated 19 June 1961 titled
"JT11D-20 Engine Program Review"
(b) OXC-1479 dated 24 March 1961 titled
ttJTl1D-20 Engine Controls Problems"
25X1A
Part I Program Present Status
1. Pratt & Whitney, Florida, was vi
17 July 1961 for an orientation visit for
for subject review. During 17 and 18 Jul
an excellent over-all briefing by Messrs.
The balance of the week was spent on subject review, g s or
which are summarized herewith.
2. X Engine Initial Delivery:
(a) Schedule:
Relative to the XD engine production schedule established
at the 12 June Suppliers Meeting as presented in reference (a)
memorandum, progress as of 24 July as assessed by the writer is as
follows :
En g. No.
Scheduled
Delivery
Present St
Assy. Status T
atus Relative
o Schedule
Projected
Delivery Estimate
XD-1
10/6/61
55% complete 22
weeks late
10/24/61
XD-2
10/20 61
5% complete 4
weeks late
11/17/61
XD-3
11/3/61
Not Started 2
weeks late
11/17/61
At this time barring acceleration or further probable deceleration,
it would appear that XD engine delivery dates will slip a minimum
of 4 weeks. Although no official change in schedule is acknowledged
by P&& so far, the realism of this schedule is rapidly becoming
questionable.
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(b) Engine Discs:
All compressor and turbine discs for XD-1, 2, and 3
have passed the spin test for the Mach 2.0 condition (one
rejected and successfully replaced) and are in or ready for
engine assembly. No further delays expected here.
(c) Parts Shortages:
A combination of many engineering changes and slow
recovery of a weak production control function (ref.(a) memo)
has resulted in the following parts shortages of which some
are purchased major components but the majority are "in house"
fabricated plumbing:
Eng. No. Parts Short at Assembly
XD-1 93
XD-2 300
XD-3 Unknown but probably
much over 300
The above figures may be compared with the approximate total
bill of material of 2900 parts per engine.
This area is the major force delaying the XD engine
schedule. The seriousness of the situation is evidenced by
the lack of feel for the shortage magnitude on XD-3I
(d) Controls:
The main and afterburner controls delivery schedule has
slipped relative to that reported in reference (a) memorandum
as follows:
For Eng. No.
Delivery
Schedule Was
Delivery
Schedule Now
XD-1
7/10/61
7/19/61
XD-2
7/15/61
8/3/61
XD-3
8/18/61
8/28/61
This slippage primarily is due to the necessity for recutting
acceleration and droop as well as speed cams for single power
lever operation at the limited Mach 2.0 condition. Hardware
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OXC-1986
Page 3
incorporation of "must conform" engineering changes resulting
from the problems reported in reference (b) memorandum has also
contributed to this delay.
objections to the Y engine delivery schedule proposed in
memorandum dated 14 June 1961 and as listed in reference (a) memorandum,
a corresponding production schedule will be implemented.
4. Time Accumulation z Development Engine Status:
(a) In spite of a maximum level of effort, with the exception
of D-20 afterburner time, very little progress is evident in the
accumulation of meaningful engine test time since the 12 June
meeting. The importance of this test time accumulation is para-
mount not only in endurance preparation for Y-PFRT but also in
order to verify controls and gas generator design fixes and to
verify calculated engine performance levels. It is hopefully
expected (and imperative if further delay is to be minimized) that
progress in this area is imminent with the return to test of engines
FX-111 and EX-115 as described in paragraph (b) below.
3. Y Engine Tentative Delivery Schedule:
Since queries to the airframe contractor have revealed no
Engine test time accumulation as follows:
Time As Of
Time As Of
Progress
Target Prior
Time 6/13/61 (hrs)
7J 1/61 (hrs)
hrs
Y-PERT Dec. 1961
Total Engine
2845
2916
71
3000
Full D-20
126
147
21
326
Hot Inlet
262
262
0
350
1900?F Turbine
209
209
0
300
M3.0 Mission
23
23
0
123 min.
Endurance Cycle
273 desired
D-20 Afterburner
60
97
37
250
(b) Development Engine Program Status as of 21 July:
FX-111: Starting on test A-3 sea level stand. Four weeks late due
(D-20) to shortages and re-inspection. Running vibration check
and verification of compressor rim damper fix.
FX-112: At assembly, 65% rebuild completed. Four weeks late now
(D-20) due to component and plumbing shortages and parts re-
inspection. To run plumbing, controls, and engine en-
durance on hot inlet sea level stand A-1. Target to test
7/31/61.
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25X1A
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25X1A
FX-113: At assembly, 55% rebuild completed. Program changed
(D-20) to run performance calibration on altitude stand C-5
after engine FX-115 now on C-5. Target to sea level
stand for preliminary calibration 7/31/61.
FX-114: Some parts at assembly. Compressor and some components
(D-20) cannibalized for FX-113. Parts availability under
investigation. Targeting Y-PFRT in December 1961:
must start assembly soon to meet this target.
FX-115: Starting on test C-5 altitude stand. Three weeks late
(D-20) due to component and plumbing shortages and parts re-
inspection. To run X-PFRT.
FX-116: On test A-2 sea level stand. P-4 (A3J) configuration
(P-2) boundary layer control tests.
FX-117: On test, completing D-20 afterburner calibration A-4
(F-2) sea level stand. To be moved to A-5 sea level stand
for ejector endurance targeted to start approximately
8/14/61 after plant shutdown.
Due to the timeliness of information contained herein and
necessary travel schedules, Part II of this report covering
technical and organizational problem status will be released
subsequently in order not to delay this release. Covering
QIIYIIYffw llTS winwn...-~.J__.v _ 7 ? q 1
DPD-DD/P
Distribution:
1&2-CH/bB/DPD
3-SA/TA/DPD
4&5-DB/DPD
6-RI/bPD
DPD/DB/ROD:rew
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TD
NAME AND ADDRESS
INITIALS
DATE
1.
n
,
f
2'
D/Tech
3.
4.
5.
6.
7.
RETURN TO SENDER
ACTION
CONCURRENCE
INFORMATION
COMMENT
FILE
SIGNATURE
REMARKS
The attached OX memo (OXC 1986) was
returned to me this morning by Mr. Helms
secretary who located it, apparently, among
some of Mr Bissell's old records - although
the distribution does not indicate that
Mr. Bissell was an addressee
I leave it to you to decide what dispos.tion
to make of it From a historical standpoint
it might be interesting
DAD! O5A
FROM
NAME AND ADDRESS
PHONE NO.
DATE
d
-
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