(6)
Make sure that the light switch 11LJ is set to on. Subtask 49-12-54-865-054
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
4. Procedure
_________
(Ref. Fig. 401/TASK 49-12-54-991-003, 402/TASK 49-12-54-991-004) Subtask 49-12-54-210-052
A. Clean the rear APU mount-bracket with CLEANING AGENTS (Material No. 11-001).
(1)
Do a visual inspection of the rear APU mount-bracket for damage:
(2)
Make sure that the bolt holes of the bracket are not elongated.
(3)
Make sure that the surface finish of the tapered shaft is not scratched, scored or burred.
(4)
Make sure that the thread in the bracket, for the setscrew is not damaged.
(5)
Make sure that the flange is not bent.
(6)
Make sure that there are no cracks in the rear APU mount-bracket. If you think there is a crack, do a dye-penetrant inspection.
(7)
Install the PROTECTOR - THREADS, APU MOUNTING BOLTS to the rear APU mount.
Subtask 49-12-54-420-051
B. Installation of the APU Mount Brackets
(1)
Install the FWD left and the FWD right APU mount-brackets.
(a)
Carefully put the FWD APU mount bracket (17) in position on the vibration isolator and the APU. Make sure that the spigot is correctly engaged in the APU.
(b)
Attach the FWD APU mount-bracket (17) to the APU with the bolts (10).
(c)
TORQUE the bolts (10) to between 2.6 and 3.0 m.daN (19.17 and
22.12 lbf.ft).
(d)
Remove the thread protector and install the FWD APU mount-nut (16).
(e)
TORQUE the FWD APU mount-nut (16) to between 2.5 and 3.1 m.daN
(18.43 and 22.86 lbf.ft)
(f)
Install the setscrew (15) in the FWD APU mount-bracket (17) and lock it in position with the nut (14).
(g)
Attach the bonding strap (13) to the setscrew (15) with the washer (12) and the nut (11) (Ref. TASK 20-28-00-912-002).
(h)
Safety the bolts (10) with lockwire-corrosion resistant steel
0.63 mm (0.0248 in.) dia..
(2)
Install the rear APU mount-bracket.
(a)
Carefully put the rear APU mount bracket (31) in position on the APU.
(b)
Attach the rear APU mount-bracket (31) to the APU with the bolts (30).
(c)
TORQUE the bolts (30) to between 2.6 and 3.0 m.daN (19.17 and
22.12 lbf.ft).
(d)
Safety the bolts (30) with lockwire-corrosion resistant steel
0.63 mm (0.0248 in.).
(e)
Put the rear vibration isolator (23) in position on the rear APU mount-bracket (31).
(f)
Remove the thread protector and install the rear APU mount-nut (29). Do not tighten the nut at this step of the procedure.
(g)
Connect the rear vibration isolator (23) to the tie-rods (28) and (22).
1_ Align the rear left tie-rod (28) with the rear vibration
isolator (23) and insert the bolts (27).
2_ Install the washers (26) and the nuts (25) to the bolts (27).
3_ TORQUE the nuts (25) to between 0.3 and 0.35 m.daN (26.54 and
30.97 lbf.in).
4_ Safety the nuts (25) with the cotter pin (24).
5_ Align the rear right tie-rod (22) with the rear vibration
isolator (23) and insert the bolt (21).
6_ Install the washer (20) and the nut (19) to the bolt (21).
7_ TORQUE the nut (19) to between 0.55 and 0.75 m.daN (48.67 and
66.37 lbf.in).
8_ Safety the nut (19) with the cotter pin (18).
9_ Hold the rear vibration isolator (23) to prevent movement and
TORQUE the rear APU mount nut (29) to between 7.7 and 8.5
m.daN (56.78 and 62.68 lbf.ft).
Subtask 49-12-54-080-051
C. Remove the APU hoist (Ref. TASK 49-00-00-080-001) Subtask 49-12-54-420-052
D. Apply a thin layer of SPECIAL MATERIALS (Material No. 05-027) to the rear vibration isolator (23).
5. Close-up
________ Subtask 49-12-54-865-055
A. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s): 1KD, 2KD.
Subtask 49-12-54-410-051
B. Close Access
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