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WARNING:  HYDRAULIC FLUID MAY CONTAIN TRICRESYL PHOSPHATE. THIS ADDITIVE IS POISONOUS AND CAN BE READILY ABSORBED THROUGH THE SKIN. USE NEOPRENE GLOVES AND MAKE CERTAIN THAT THIS OIL DOES NOT REMAIN ON SKIN. USE IN A WELL VENTILATED AREA. AVOID PROLONGED BREATHING OF VAPORS. AVOID EYE AND REPEATED SKIN CONTACT. KEEP AWAY FROM SPARKS AND FLAMES.
NOTE:  Ensure that O-rings are properly seated, and that sealing surfaces on the rear spar are clean and free from flaws. Apply assembly lube or hydraulic fluid to all O-rings and fittings to facilitate installation.
D.  Align holes and install mounting bolts (3) and (5).
CAUTION:  ENSURE ALL PARTS, TOOLS AND FOREIGN MATERIALS ARE REMOVED BEFORE LEAVING TANK.
E.  At the aft face of the rear spar web, where heat exchanger fittings (1) pass through, install fittings as follows:
(1)  
Install washers (8) and bulkhead nuts (7). Lockwire nuts.

(2)  
Install unions (6) on heat exchanger inlet and outlet fittings. Lubricate with assembly lube or hydraulic fluid.

CAUTION:  EXERCISE CARE TO PREVENT IMPURITIES FROM ENTERING HYDRAULIC SYSTEM.

(3)  
Remove protective caps from hydraulic lines and connect to unions.

F.  Install fuel tank access panel (Ref Chapter 28, Fuel Tank Access Panels - R/I).
G.  Service hydraulic reservoirs (Refer to Chapter 12, Hydraulic Fluid Servicing.
H.  Refuel fuel tank No. 2 to a minimum of 250 gallons of fuel (Ref Chapter 12, Servicing).
I.  Pressurize hydraulic system B using electric motor-driven pumps (Ref 29-12-0).
J.  Check heat exchanger fittings for leakage.
K.  Check fuel tank for leakage in areas reworked by heat exchanger removal and installation (Ref Chapter 28, Fuel Storage System).
500 
Feb 15/73  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  29-12-91 Page 403 

SYSTEM B HYDRAULIC FLUID HEAT EXCHANGER - REMOVAL/INSTALLATION

EFFECTIVITY
Airplanes with S271N401-X Heat Exchanger
1. General
A.  A heat exchanger is installed in the bottom of No. 2 wing tank. A container will be necessary to catch any fluid when removing the heat exchanger. Should any fluid spill on the airplane, the affected area must be decontaminated (Ref 12-40-0).
2.  Equipment and Materials
A.  Skydrol Assembly Lube - MCS 352 or Hydraulic Fluid - BMS 3-11 (Ref 20-30-20)
3.  Prepare for Removal
A.  If flaps are not extended, pressurize hydraulic system B and operate flap handle to ten degree position. Depressurize hydraulic system B (Ref 29-12-0 MP).
B.  Depressurize applicable hydraulic reservoir(s) (Ref 29-09-300 MP).
C.  Open the following circuit breakers (P6):
(1)  
FLIGHT CONTROL SHUT-OFF VALVES BAT STDBY RUDDER

(2)  
FLIGHT CONTROL SHUT-OFF VALVES FLAP

(3)  
ALTERNATE TRAILING EDGE FLAP DRIVE AC

(4)  
HYDRAULIC SYSTEM ELEC HYD PUMP CONT SYS B

D.  Defuel applicable wing fuel tank and remove fuel tank access panel No. 1 (Ref 28-23-0, Defueling).
E.  Prepare fuel tank for entering (Ref 28-10-0 MP, Purging and Entry).
WARNING:  FUEL TANK IS HAZARDOUS AREA. KNOW PRECAUTIONS BEFORE ENTERING FUEL TANK, OR INJURY TO PERSONNEL AND DAMAGE TO AIRPLANE MAY RESULT.
4.  Remove Heat Exchanger (Fig. 401)
A.  Disconnect and cap heat exchanger inlet and outlet lines at rear spar.
B.  Remove unions, bulkhead nuts and washers. Discard O-rings.
C.  Remove electrical bonding jumper from wing tank stringer.
D.  Remove heat exchanger mounting bolts and washers. Retain laminated washers for
installation.

E.  Loosen heat exchanger fittings from rear spar.
NOTE: Do not use material harder than 2024-T3 aluminum for removing sealant.
F.  Remove heat exchanger through tank access opening.
5.  Install Heat Exchanger (Fig. 401)
A.  Insert O-rings in grooves of heat exchanger fittings.
Feb 20/85 29-12-92 Page 401
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.

System B Hydraulic Fluid Heat Exchanger Installation  500 
29-12-92  Figure 401  Feb 20/85 
Page 402 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

B.  Pass heat exchanger through wing tank access opening with the inlet and outlet ports going through opening first.
C.  Enter fuel tank and position inlet and outlet fittings so they enter the holes in rear spar.
NOTE:  Ensure that O-rings are properly seated, and that sealing surfaces on the rear spar are clean and free from flaws. Apply assembly lube or hydraulic fluid to all O-rings and fittings to facilitate installation.
　
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