(11)
Make sure that the threads of the vent and drain valve (21) are clean and in a correct condition.
(12)
Make sure that the:
-electrical cables of the APU starter motor
-ring terminals of the starter motor cables are clean and in a correct condition.
(13)
Make sure that the:
-phase leads of the APU generator
-ring terminals of the APU generator phase leads are clean and in a correct condition.
(14)
Put the SUPPORT FRAME - APU (with the APU temporarily installed on it) in the correct position below the APU compartment.
(15)
Make sure that the HOIST - MINILIFT is installed correctly (Ref. TASK 49-00-00-480-001).
(16)
Remove the blanking covers from APU exhaust and hot nozzle assy flange.
(17)
Make sure that the hot nozzel assy flange is in the temporary position to which it was moved during APU removal.
NOTE : There must be sufficient clearance between the hot nozzle assy
____ and exhaust flange to prevent damage to the APU during installation.
Subtask 49-11-11-420-056-A
C. Installation of the APU
(1) Removal of the APU from the SUPPORT FRAME - APU.
WARNING : OBEY THE HOISTING SAFETY PROCEDURES.
_______ MAKE SURE THAT THE HOIST IS ASSEMBLED AND ATTACHED CORRECTLY BEFORE YOU PUT A LOAD ON IT. OBEY THE MANUFACTURER'S INSTRUCTIONS WHEN YOU USE THE HOIST. IF THE HOIST IS IN AN INCORRECT CONDITION THE LOAD CAN MOVE ACCIDENTALLY AND KILL PERSONS OR CAUSE INJURY.
CAUTION : MAKE SURE THAT ALL PLUMBING IS FREE FROM OBSTRUCTION.
_______
(a)
Connect the HOIST - MINILIFT to the APU (Ref. TASK 49-00-00-480-001).
(b)
Operate the HOIST - MINILIFT carefully until the APU weight is removed from the SUPPORT FRAME - APU, then disconnect the APU from the SUPPORT FRAME - APU.
NOTE : Turn the upper drum shaft of the HOIST - MINILIFT until
____ you have removed the slack from the hoist cable, then disconnect the APU from the SUPPORT FRAME - APU. Make sure that you do not lift the SUPPORT FRAME - APU.
NOTE : Do a check and make sure that the HOIST - MINILIFT is
____ assembled and installed correctly.
(2) Installation of the APU on the APU mount vibration-isolators. (Ref. Fig. 404/TASK 49-11-11-991-007)
CAUTION : BE CAREFUL WHEN YOU ENGAGE THE TWO FORWARD MOUNT BRACKETS
_______ ON THE VIBRATION ISOLATORS. THE MACHINED FACES ON THE CONE BOLTS OF THE VIBRATION ISOLATORS MUST BE ALIGNED WITH THE SLOTS ON THE MOUNT BRACKETS. IF NOT YOU WILL CAUSE DAMAGE TO THE MATING FACES.
CAUTION : DO NOT TURN THE HOIST HANDLE MORE THAN 90 DEGREES WHEN THE
_______ APU MOUNT BRACKETS ARE TIGHTLY ENGAGED ON THE VIBRATION ISOLATORS. IF YOU TURN THE HOIST HANDLE MORE THAN 90 DEGREES, YOU CAN CAUSE DAMAGE TO THE APU AND THE APU MOUNTS.
CAUTION : DO NOT RELEASE THE LOAD FROM THE HOIST UNTIL THE MOUNT NUTS
_______ ARE TORQUED. IF THE MOUNT NUTS HOLD THE LOAD BEFORE THEY ARE TORQUED, YOU CANNOT APPLY THE CORRECT TORQUE VALUE.
CAUTION : MAKE SURE THAT ALL PLUMBING IS FREE FROM OBSTRUCTION.
_______
(a)
Operate the HOIST - MINILIFT and carefully lift the APU into the correct position in the APU compartment.
(b)
Carefully engage the APU mount brackets (42) and (46) on the APU vibration isolators.
(c)
Remove the PROTECTOR - THREADS, APU MOUNTING BOLTS from the threads (41) of the rear APU mount bracket and the vibration isolators.
(d)
Installation of the nuts (40), (47) and (48).
(e)
Do a visual check of the FWD LH vibration isolator, FWD RH vibration isolator and AFT vibration isolator (Ref. TASK 49-12-00-210-004).
1_ Install and turn the nuts (40), (47) and (48) a few turns on
the threads (41) of the vibration isolators and aft mount
bracket.
2_ Use a torque wrench to turn the nuts and measure the breakaway
torques of the nuts (40), (47) and (48).
NOTE : If the breakaway torque of the LH (47) or RH FWD nut____
(48) is less than to 0.10 m.daN (8.84 lbf.in) replace
the nut.
If the breakaway torque of the AFT nut (40) is less
than to 0.20 m.daN (17.69 lbf.in) replace the nut.
3_ Turn the nuts (40), (47) and (48) until they are in contact
with the APU mount brackets or vibration isolator.
4_ TORQUE the LH (47) and the RH (48) nuts to between 2.5 and 3.1
m.daN (18.43 and 22.86 lbf.ft)
5_ TORQUE the aft nut (40) to between 7.7 and 8.5 m.daN (56.78
and 62.68 lbf.ft)
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