AUDITION OF IN-FLIGHT REFUELING SYSTEM

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP81B00878R000600030077-4
• Release Decision: RIPPUB
• Original Classification: C
• Document Page Count: 6
• Document Creation Date: December 14, 2016
• Document Release Date: January 3, 2003
• Sequence Number: 77
• Publication Date: January 16, 1961
• Content Type: CONT

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FNGINFFRING STUDY
LOCKHEED AIRCRAFT CCd.P.
-101
CHANGE PROPOSAL
DATE
A 1-16-61
AFFECTS' WSPO PROJECT FX]
NAME OF MAJOR COMPONENT
PART OR LOWEST SUBASSEMBLY
PART NO. & MODEL OR TYPE
AIRPLANE
- - - -
TITLE OF PROPOSAL =
ADDITICEN OF IN-FLIGHT REFUELING SYSTEM
NATURE OF PROPOSAL
SEE PAGE 2
REASON FOR PROPOSAL
To provide in-flight refueling capabilities on two U-2C aircraft per customer
request. The proposed IFR configuration is based on design studies authorized
by approved Change Proposal LAC-91.
ESTIMATED COST AND TIME INVOLVED
S E
ADDITIONAL FUNDING REQUIRED :
ESTIMATED COST FOR KITS OR PARTS See Page 4
ADDITIONAL FUNDING REQUIRED None (SP-1918 & SP-1917)
ITEMS AFFECTED BY PROPOSAL
aI
SAFETY MISSION PERFORM- OPERATING INTER- WEIGHT OR TOOLS & MAINTE- SERVICE FLIGHT MAINTE
EFFEC, ANCE PROCEDURE CHANGE WEIGHT & SUPPORT NANCE LIFE
MANUAL NANCF
TIVENESS ABILITY BALANCE EQUIPMENT PROCEDURE M
NUAL
[A
NO
ANUAL ~
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O ~?? i LJ ? 1 L-
EST. MAN/HRS. REQ'D. TO ACCOMPLISH CHANGE IN FIELD
SOURCE OF PARTS FOR KfT
AVAILABILITY --- WEEKS AFTER APPROVAL
LAC
See Page 4 25X1
DISPOSITION OF SPARES AFFECTED ~~
None
INITIATED BY APPROVED
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 LIAC-101
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1. Develop and install an in-flight refueling system on two U-2C aircraft.
The design to be based on use of the KC-135 tanker flying boom equipment,
and to provide for refueling the main wing tanks only, utilizing a hyd-
raulically extendable and retractable nozzle receptacle installed on the
top centerline of the fuselage above the sump tanks. Refueling the main
wing tanks requires modification of existing fuel system plumbing to feed
from these tanks first. To maintain satisfactory flight characteristics
for all fuel loadings with the revised "using" sequence, the zero fuel
weight C.G. limits will be changed to approximately 26.0-26.5% MAC (actual
limits to be determined by flight tests). The aircraft will be ballasted
for the most forward loading condition to bring it within the above C.G.
limits. This loading condition is assumed to be as follows:
System I, System III (Cheek), Sextant, Mark III Hand Control,
Destructor, Single Side Band Radio, added 02, IFR, System VI
with both ventral and rams horn antennas, Tracker, Slipper
Tanks, System IX, System IV (with no Ballast in drag chute
compartment).
All other load configurations will require a weight and balance check prior
to flight, with the addition of temporary ballast if necessary.
This Change Proposal also includes (1) incorporation of an additional 514
cubic inch container in the ship's oxygen system which will provide an 0
supply with adequate reserve for the longest refueling mission, and (2) 2
installation of an electric driven submerged fuel boost pump with cockpit
control switch. This will provide the pilot with optional back up for the
existing hydraulic driven pump in the event of loss of hydraulic pressure
or unsatisfactory fuel flow conditions.
To assure optimum utilization of the proposed IFR capabilities, consider-
ation should be given to the following:
a. Fuel Logistics: A problem may exist since the U-2C normally
operated on LF1A or JPTS fuel, whereas the KC-135 normally
operates on JP-4 (but is capable of using either fuel).
b. Rendezvous: Problems experienced in a trial rendezvous of a
U-2C and KC-135 Tanker under ideal daytime conditions and
using a 2-way radio communications indicate considerable
difficulty may be encountered on actual refueling missions
when attempting to rendezvous without use of homing facilities.
2. Modification of the aircraft (U-2C) to consist of the following:
a. Fuselage: Provide hole in structure at top centerline between F.S.
365 and 389, beef up structure locally and add mounting provisions
for refueling Receptacle. Install vapor tight container to seal
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 LAC-101
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8R
NATURE OF PROPOSAL: (Cont.)
off vapors from engine section. To accomodate installation of a
(refueling) fairing and maintain service accessibility, relocate
openings for the refrig. coolant discharge, refrig. regulator access,
cabin air discharge louvers, oil tank filler, P-2 exhaust vent, and
engine section cooling scoops. Install ducting as required by re-
location of outlets and scoops.
Relocate upper navigation light to top of new fairing aft of Recept-
acle. Construct and install fairing to house refueling Receptacle
and HF antenna tuner. Revise plumbing, wiring, and compressor bleed
air duct in the upper engine section as required to avoid interferences.
b. Fuel System: Revise plumbing arrangement to feed the main wing tanks
into the left-hand (high level) sump tank, and the auxiliary tanks into
the right-hand (low level) sump tank. Install refueling Receptacle Assy,
(GFAE), disconnect pressure seitch, flow regulator, check valves, and
connecting plumbing to right and left hand main wing tanks. Install
shut-off valves and associated float valves with related plumbing in
main wing tanks. Install electric driven fuel boost pump in R.H. sump
tank with related plumbing. Replace chip catcher with 200 mesh strainer
and install manual fuel shut-off between sump tanks and strainer.
c. Hydraulic System: Revise the hydraulic panel and install solenoid
control valves and related plumbing to connect with the refueling
Receptacle actuating cylinder and nozzle latch cylinder.
d. Cockpit & Electrical: Construct and install IFR control (switch)
panel in L.H. console. Modify instrument panel by installing IM
system indicator panel in space presently occupied by the Magnetic
Compass. This requires addition of new mounting provisions and re-
location of the Magnetic Compass to the upper right periphery of
the panel. Construct and install new instrument panel glare shields.
Install refueling Receptacle Signal Amplifier in cockpit. Install
fuel level float switches in L. and R. main wing tanks for indicating
full and half-full conditions. Install wiring from cockpit to the
refueling system fuel and hydraulic valves, nozzle receptacle, and
tank mounted float switches. Install electric fuel boost pump con-
trol switch and related wiring.
e. Oxygen System: Install one additional 514 cubic inch oxygen bottle
in the L.H. cheek with related mounting bracketry, valves, and plumb-
ing.
3. No Service Bulletin required. All work to be performed at the factory on
the basis of engineering drawings.
4+. This ECP does not include changes required to the KC-135 or installation
of any electronic equipment for rendezvous.
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 LAC-lol
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GFAE EQUIPMENT LIST
AF Stock No.
Description
Quantity
Per A/C _
1560-652-0951
vM65350.14
Receptacle Assy.
1 Ea.
1560-341-6238
VM65395 - 21
Guide Assy
1 Ea.
1560-345-2541
VM65379-3
Shim (Cover)
12 Es.
VM38170--12
Cylinder Assy
1 Ea.
1560-345-2542
v165382-1
Spring Assy
1 Ea.
1560-345-2538
VM65305-1
Strut Assy (Down Lock)
1 Ea.
1560-345-2537
vM653o4-1
Strut Assy (Up Lock)
1 Ea.
1560-345-2536
vM653o1-21
Torque Shaft Assy
1 Ea.
5306-625-5426
vi653o9-1
Bolt (Stop)
2 Ea.
1560.345-2541
VM65379-2
Shim (Stop Bolt)
2 Ea.
1560-345-2544
VM65399-21
Bearing Support Assy
1 Ea.
The GFAE test nozzles listed below are required to ground check the aircraft
refueling system. It is essential that a set of one each be supplied on a loan
basis to the Contractor as soon as possible after start of aircraft modification.
It is also recommended that a set of one each be considered for the using detach-
ments.
AF Stock No.
Part No.
Description
4920-547-9016
4920-587-4923
VME500015 Nozzle - Test, Refueling
VM19607 Nozzle - Test, Electrical
ESTIMATED COST OF TWO INFLIGIT REFUELING KITS (SP-1918)
Design
Mfg. Assam. & Installation
(Includes material & parts)
Flight Test
TOTAL PRICE SP-1918
25X1A
1. Prototype - May 22, 1961
Subsequent Article - Depending upon availability of aircraft and workload.
The modification, related estimates and schedule outlined in this proposal
are based on the timely receipt of the GFAE Equipment listed in this ECP.
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 LAC-101
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NOW' RECOmmENDED SPARES SP-1917:
The recommended spares are to be ordered by the depot on Purchase Order Requests.
(Note: The spares listed below have been ordered to take advantage of price
breaks).
14120-4
18140--2
1430D 22A-52
H-254
12257 29
2-153-101
6487
F73470
ME18D .26.5
A20-1B
A402P4SHS-4
4TL1-3D
R3315
9220-3620
MS35
IHS7
Descri lion Unit Price
valve - Hyd. Selector 4
Valve - Hyd. Selector 4
Switch - Pressure 8
Valve - Press. Fueling 8
(Make from 5..256-51)
Valve Shut off 4
Valve Float 3
Limiter - Flow 3
Switch - Float 6
Relay 4
Amplifier 4
Switch 4
Switch 4
Light Assem. 4
Relay 6
Switch. Receptacle 8
Switch - Receptacle 8
Total Price
25X1
25X1
TOTAL PRICE SP-1917
25X1A
Total Price SP-1918
Total Price SP-1917
GRAND TOTAL PRICE
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 25X1A
25X1A
25X1A