(2)
Install the bonding jumper to the clamp with a screw, two washers and nut
(AMM 20-10-185/401).
(a) You must have a resistance of 0.0025 ohm maximum (AMM 20-22-01/601).
(3)
Install the six screws that attach the fuel line shroud to the upper shroud.
O. Connect the bleed air line to the fitting of the control valve for the fuel sensing flow in the upper shroud.
P. Connect generator control receptacle to fitting in upper shroud.
Q. Connect EGT receptacle to fitting in upper shroud.
R. Connect generator, starter motor, and APU harness receptacles to fittings in upper shroud.
S. Connect upper shroud to airframe structure bonding jumper (Fig. 401, sheet 3, detail B).
T. Gain access to horizontal stabilizer jackscrew compartment just aft of pressurized bulkhead.
U. Reaching through opening in horizontal web, connect air pressure line to cooling air shutoff valve pneumatic actuator.
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4. Restore Airplane to Normal Configuration
A. Install APU power plant (Ref 49-11-0.)
B. Position lower shroud against upper shroud and close shroud latches.
CAUTION: MAINTAIN A MINIMUM CLEARANCE OF 0.18 INCH BETWEEN ENGINE PLUMBING, FIRE DETECTOR, CLAMPS AND INSIDE SURFACE OF LOWER SHROUD.
EXERCISE EXTREME CARE NOT TO DAMAGE SHROUD DRAIN LINES WHEN HANDLING SHROUD.
C. Disengage APU compartment access door support rods and stow rods. Close and latch access door.
D. Close the circuit breaker on M280 module-APU accessory unit on E3-3 electronic shelf.
E. Close horizontal stabilizer trim control circuit breaker on P6 panel and remove placard.
F. Position BATTERY SWITCH to ON and rotate horizontal stabilizer trim to neutral position.
G. Remove placard from APU START SWITCH.
H. Position BATTERY SWITCH to OFF if power no longer required.
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Feb 15/79 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 49-12-31 Page 407
APU SHROUD LATCH - ADJUSTMENT/TEST
1. General
A. This procedure applies to the latch bolts securing the lower shroud to the upper shroud. The latch bolts should have proper latching tension and both a lock nut and jam nut installed.
B. This adjustment will be made with the lower shroud installed and all latches in secured position.
2. Adjust APU Shroud Latches
A. Unlatch one shroud latch assembly.
B. Check force required to move latch handle through over-center travel. Force should be 23-33 pounds.
C. If latch requires adjustment, loosen jamnut and move lock nut as required to either increase or decrease tension. Tighten jam nut.
NOTE: To prevent loss of jam nut from bolt, deform outer two threads of bolt.
D. Repeat steps A through C for each of remaining latches.
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APU MOUNTS - DESCRIPTION AND OPERATION
1. General (Fig. 1)
A. The APU mounts support the APU installation and isolate the airplane from adverse vibrations of the APU engine. The APU mounts consist of the shroud mounts, shroud rings, and APU engine mounts. The shroud mounts attach the shroud rings to the airplane and the engine mounts attach the APU engine to the shroud rings. The shroud mounts, shroud rings, and the engine mounts constitute the APU mount system.
2. Shroud Mounts (Fig. 1)
A. The shroud mounts attach the shroud rings to the airplane structure. The shroud mounts consist of airplane mount brackets, struts, and ring mounts. The ring mounts are integral with the shroud rings. Each shroud ring is supported vertically by two struts and laterally by one strut. In addition, the aft shroud ring is supported axially by two struts. The struts are fastened to the brackets with bolts and nuts.
3. Shroud Rings (Fig. 1)
A. Two shroud rings provide the mounting base for the upper shroud and the APU engine mounts. For convenience of installation, the shroud rings are made integral with the upper shroud.
4. Engine Mounts (Fig. 1)
A. Three engine mounts attach the APU engine to the shroud rings. Two mounts are located on the right side of the APU and one on the left side. The mounts are designed to give the engine maximum support in all directions. Each engine mount consists of two mount brackets, a vibration isolator, and a cap. The mount brackets attached to the shroud rings are fitted with the vibration isolators. The mount brackets attached to the APU engine flanges contain the caps. The caps are used to facilitate a quick removal and installation of the APU.
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