737 AMM 飞机维护手册 机载辅助动力AIRBORNE AUXILIARY POWER(24)

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F.  Disconnect fire detection sensor element plug from receptacle in upper shroud.
G.  Disconnect APU to upper shroud bonding jumper (Fig. 401, Detail C).
H.  Remove clamp attaching bleed air duct coupling to turbine plenum bleed air flange.
I.  Push bleed air duct coupling outboard as far as it will go.
J.  Move compressor air inlet duct lock handle outboard until heel of cam is free from spring arm. Rotate compressor plenum downward so that compressor air inlet opening in plenum no longer matches air inlet duct in upper shroud.
K.  Install hoist assemblies to brackets in APU compartment with pins.
CAUTION:  CHECK THAT HOIST CABLES ARE UNIFORMLY WRAPPED AROUND DRUMS BEFORE ATTEMPTING TO SUPPORT APU. CABLES THAT ARE NOT UNIFORMLY WRAPPED AROUND DRUMS CAN CAUSE A SHORT BUT SUDDEN DROP OF THE UNIT, IMPARTING A SHOCK LOAD TO THE HOIST AND FITTINGS.
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L.  When using F80002 cradle, insert tubes in cradle base and secure in place with pins.
M.  Attach hoist cables to cradle assembly tubes with pins.
N.  Install cradle base on APU power plant and secure in place with pins (Fig. 401).
O.  Pull hoist cables taut to remove load from APU engine mounts.
P.  Remove nuts, washers, and bolts fastening mount caps to engine mount brackets. Do not remove cap and mount bracket hinge bolts. Open mount caps.
Q.  Lower power plant slowly. Guide unit to clear bleed air duct coupling, fuel line, and airplane structure.
R.  After the unit is set on transportation dolly, slacken hoist cables.
S.  Disconnect hoist cables from tubes by removing pins.
NOTE:  If spare cradles are available, they may be used for transportation and storage of APU power plants.
T.  Inspect torque box, air inlet liner and aft bulkhead for cracks. If cracks are found, refer to the structural repair manual for damage limits.
5.  Install APU Power Plant
A.  Position APU power plant, installed on a cradle base, directly under APU compartment.
B.  When using F80002 cradle, insert tubes in cradle base and secure in place with pins (Fig. 401).
C.  Connect hoist cables to tubes with pins.
D.  Rotate compressor plenum air inlet opening down.
May 01/98 49-11-0 Page 403 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.

E80869 E82211
APU Power Plant Installation  514 
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505 APU Power Plant Installation Feb 01/95 Figure 401 (Sheet 2) 49-11-0 Page 404A/404B BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.

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Feb 01/95  Figure 401 (Sheet 3) BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  49-11-0 Page 405 

E.  Slowly raise APU power plant. Guide unit to clear airplane structure.
CAUTION:  WHILE RAISING APU, CHECK THAT CABLES WRAP UNIFORMLY AROUND DRUMS. IF CARE IS NOT TAKEN WHILE RAISING UNIT, CABLES MAY BECOME TANGLED ON DRUMS. THIS CAN CAUSE A SHORT BUT SUDDEN DROP OF THE UNIT, IMPARTING A SHOCK LOAD TO THE HOIST AND FITTINGS.
F.  When power plant is nearly in place, stop hoisting operation and make following checks:
(1)  
Ensure that mount caps do not interfere with installation.

(2)  
Check that cooling air inlet duct seal is properly aligned with cooling air fan flange.

(3)  
Align compressor plenum air inlet flange with upper shroud air inlet duct and guide into place as APU is raised.

G.  Raise APU slowly into place.
CAUTION:  AVOID ANY SIDEWAYS MOVEMENT OF THE APU OVER THE LAST ONE-INCH OF TRAVEL. THIS COULD CAUSE THE COOLING AIR INLET DUCT SEAT TO BE MISALIGNED WITH THE COOLING FAN FLANGE AND IMPAIR THE COOLING AIR SYSTEM.
H.  With the APU in place, make sure the seal of the cooling air inlet duct is touching the cooling fan flange:
(1)  
APU's WITH A SEAL CLAMP;
If the seal is not touching the cooling fan flange, adjust the seal:

(a)  
Lower the APU.

(b)  
Loosen the seal clamp and pull the seal down the necessary distance for the seal to touch the cooling fan flange.

(c)  
Tighten the seal clamp.

(d)  
Lift the APU into its position.

 

(2)  
APU's WITHOUT A SEAL CLAMP If there is a clearance between the cooling fan flange and the seal for the cooling air duct, close the clearance (Fig. 402):
　
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