C. Referenced Information
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
24-41-00-861-002 Energize the Aircraft Electrical Circuits from the External Power 29-00-00-864-001 Put the Related Hydraulic System in the Depressurized
Configuration before Maintenance Action 49-00-00-480-001 Installation of the APU Hoist Tool (APS 3200) 52-41-00-010-001 Open the APU Doors for Access 52-41-21-000-001 Removal of the APU Access Door 315AL 52-41-22-000-001 Removal of the APU Access Door 316AR and the related
Door Mechanism 49-12-54-991-003 Fig. 401 49-12-54-991-004 Fig. 402
3. Job Set-up
__________
Subtask 49-12-54-860-050
A. Aircraft Maintenance Configuration
(1)
Put the warning notices on panel 25VU to tell persons not to start the APU.
(2)
Energize the ground service network (Ref. TASK 24-41-00-861-002).
(3)
Make sure that the hydraulic systems are depressurized (Ref. TASK 29-00-00-864-001).
Subtask 49-12-54-865-053
B. Open, safety and tag this(these) circuit breaker(s):
-------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------121VU APU/APU/CTL 2KD L42 121VU APU/ECB/SPLY 1KD L41
Subtask 49-12-54-010-051
C. Get Access
(1)
Put the access platform below the access doors 315AL and 316AR.
(2)
Open the APU access doors 315AL, 316AR. (Ref. TASK 52-41-00-010-001)
(3)
Set the light switch 11LJ to on.
(4)
Remove the APU access doors 315AL, 316AR (Ref. TASK 52-41-21-000-001) (Ref. TASK 52-41-22-000-001).
4. Procedure
_________ (Ref. Fig. 401/TASK 49-12-54-991-003, 402/TASK 49-12-54-991-004) Subtask 49-12-54-480-051
A. Installation of the HOIST- MINILIFT CAUTION : WHEN YOU REMOVE (INSTALL) THE APU, DISENGAGE (ENGAGE) ALL THE
_______ VIBRATION ISOLATORS AT THE SAME TIME FROM THE APU MOUNT BRACKETS. IF YOU DISENGAGE (ENGAGE) THEM ONE AFTER THE OTHER, THE LOADS WILL NOT BE EQUAL. THIS WILL CAUSE DAMAGE TO THE TIE RODS.
(1)
Install the HOIST - MINILIFT (Ref. TASK 49-00-00-480-001) Subtask 49-12-54-020-051
B.
Removal of the APU Mount Brackets
(1)
Slowly wind the handle on the APU hoist until the APU hoist-cable is in tension.
(2)
Remove the FWD left and FWD-right APU mount-brackets.
(a)
Remove and discard the lockwire from the bolts (10) of the FWD APU mount-bracket (17).
(b)
Remove the nut (11) and the washer (12) from the setscrew (15) and disconnect the bonding jumper (13).
(c)
Temporarily install the nut (11) adjacent to the nut (14) on the setscrew (15). Use the nut (11) as a locknut and remove the setscrew (15) from the FWD APU mount-bracket (17).
FWD-Left and FWD-Right APU Mount Brackets
Figure 401/TASK 49-12-54-991-003
CES
REAR APU Mount Bracket
Figure 402/TASK 49-12-54-991-004
CES
(d)
Remove the FWD APU mount-nut (16).
(e)
Remove the bolts (10) from the FWD APU mount-bracket (17).
(f)
Carefully pull the FWD APU mount-bracket (17) out and down to disconnect it from the APU and the vibration isolator.
NOTE : The FWD APU mount-bracket has a spigot which engages in
____ the APU. This spigot is 9.0906 mm (0.3578 in.) long.
(g)
Install the PROTECTOR - THREADS, APU MOUNTING BOLTS to the vibration isolators.
(h)
Clean the FWD APU mount-bracket and the setscrew with CLEANING AGENTS (Material No. 11-001).
(i)
Do a visual inspection of the FWD APU mount-bracket for damage:
(j)
Do a visual inspection of the setscrew. Replace the setscrew and the nuts if necessary.
1_ Make sure that the bolt holes of the bracket are not
elongated.
2_ Make sure that the surface finish of the tapered hole is not
scratched, scored or burred.
3_ Make sure that the thread in the bracket, for the setscrew is
not damaged.
4_ Make sure that the flange is not bent.
5_ Make sure that there are no cracks in the APU mount bracket.
If you think there is a crack, do a dye-penetrant inspection.
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