(2)
Make sure that the ground service network is energized (Ref. TASK 24-41-00-861-002).
(3)
Make sure that the hydraulic systems are depressurized (Ref. TASK 29-00-00-864-001).
(4)
Make sure that the access platform is in position below the access doors 315AL and 316AR.
(5)
Make sure that the APU access doors 315AL, 316AR are open (Ref. TASK 52-41-00-010-001) or removed (Ref. TASK 52-41-21-000-001) and (Ref. TASK 52-41-22-000-001).
(6)
Make sure that the light switch 11LJ is set to on. Subtask 49-12-52-865-055
B.
Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged
-------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------121VU APU/APU/CTL 2KD L42 121VU APU/ECB/SPLY 1KD L41
4. Procedure
_________
(Ref. Fig. 401/TASK 49-12-52-991-002) Subtask 49-12-52-210-053
A. Preparation for Installation
(1)
Clean the tie-rods (9) and (11) and the vibration isolator (16) with solvent CLEANING AGENTS (Material No. 11-001) and a fiber-bristled brush. condition.
(2)
If the tie-rods and/or the vibration isolator are damaged, replace them if necessary.
(3)
Clean and examine the attachment brackets, the APU mount-bracket (14) and the structure for damage and replace if nescessary.
Subtask 49-12-52-420-051
B. Installation of the Vibration Isolator
(1) Protective Treatment
WARNING : USE SOLVENTS/CLEANING AGENTS, SEALANTS AND OTHER SPECIAL
_______ MATERIALS ONLY WITH A GOOD SUPPLY OF AIR. OBEY THE MANUFACTURERS INSTRUCTIONS. PUT ON PROTECTIVE CLOTHING. DO NOT GET THEM IN YOUR MOUTH. DO NOT SMOKE. DO NOT BREATHE THE GAS. THESE MATERIALS ARE POISONOUS, FLAMMABLE AND SKIN IRRITANT. GET MEDICAL HELP IF YOUR SKIN OR EYES BECOME IRRITATED.
(a) Apply SPECIAL MATERIALS (Material No. 05-002) to all mating surfaces. Do not apply it to the bonding straps.
(2)
Install the vibration isolator (16) on the APU mount-bracket (14).
(3)
If removed install the tie-rods (4) and (6).
(a)
Install the bolts (18), the washers (19) and the castle nuts (20).
(b)
Tighten and TORQUE the castle nuts (20) to between to between
0.55 and 0.75 m.daN (48.67 and 66.37 lbf.in) and safety them with the new cotter pin (21)
(c)
Connect the bonding straps (10).
(d)
Install the bolts (7), the washers (8) and the nuts (9).
(e)
Tighten and TORQUE the nuts (9) to between to between 0.22 and
0.26 m.daN (19.46 and 23.00 lbf.in)
(f)
Install the clamps (26) and (27) with the bolts (22), the washers (23), the bonding strap (24) and the nuts (25) at the tie-rod (4).
(4)
Install the tie-rods (4) and (6) at the vibration isolator.
(5)
Install the bolts (5) and (17), the washers (1) and (12) and the castle nuts (2) and (13).
(6)
Tighten and TORQUE the castle nuts
-
item (2) to between to between 0.3 and 0.35 m.daN (26.54 and 30.97 lbf.in),
-
item (13) to between to between 0.55 and 0.75 m.daN (48.67 and
66.37 lbf.in) and safety them with the new cotter pin (3) and cotter pin (11).
(7)
Remove the PROTECTOR - THREADS, APU MOUNTING BOLTS and install the nut (15).
(8)
Tighten and TORQUE the nut (15) to between 2.5 and 3.1 m.daN (18.43 and 22.86 lbf.ft)
Subtask 49-12-52-080-051
C. Remove the APU hoist (Ref. TASK 49-00-00-080-001) Subtask 49-12-52-420-052
D. Apply a thin layer of SPECIAL MATERIALS (Material No. 05-027) to the vibration isolator (16), the tie-rod ends, the suspension structural brackets and the APU mount-bracket.
5. Close-up
________ Subtask 49-12-52-865-056
A. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s): 1KD, 2KD.
Subtask 49-12-52-410-051
B. Close Access
(1)
Make sure that the work area is clean and clear of tool(s) and other items.
(2)
Set the light switch 11LJ to off.
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