(2)
On the panel 25VU make sure that the APU MASTER SW pushbutton switch is off.
(3)
Put a warning notice in the cockpit to tell persons not to start the APU.
(4)
Make sure that hydraulic systems are depressurized
(Ref. TASK 29-00-00-864-001).
Subtask 49-81-00-865-051
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 49-81-00-010-051
C. Get Access
(1)
Put the access platform in position below the APU access doors 315AL and 316AR.
(2)
Open the APU access doors 315AL, 316AR (Ref. TASK 52-41-00-010-001).
(3)
Set the LIGHT control switch 11LJ to the on position.
4. Procedure
_________ (Ref. Fig. 602/TASK 49-81-00-991-004) Subtask 49-81-00-020-059
A. Disconnect the APU Exhaust Coupling for access. WARNING : CUT, REMOVE AND DISCARD THE LOCKWIRE AS YOU DO THE TASK. LOOSE
_______
LOCKWIRE CAN CUT OR BLIND YOU.
(1)
Remove the lockwire from the upper and lower halves of the heat insulation (1) and (2), remove the heat insulation halves.
(2)
Remove the clamp (3) from the exhaust hot nozzle assy. and APU exhaust duct.
(3)
Push the hot nozzle and bellows assembly (7) as far rearwards as possible.
Hot Nozzle and Sealing Ring - Inspection
Figure 602/TASK 49-81-00-991-004
CES Subtask 49-81-00-210-052
B. Visual Inspection
(1)
Examine the inner and outer flange areas of the hot nozzle assembly for distortion, wear-grooves and cracks. Replace if defective (Ref. AIPC 49814101010).
(2)
Use a hand mirror and examine the piston ring as far as possible for distortion, wear or damage. If the piston ring is found to be defective, replace the exhaust muffler (Ref. TASK 49-81-41-000-001) and (Ref. TASK 49-81-41-400-001).
Subtask 49-81-00-420-050
C. Connect the APU exhaust Coupling.
(1)
Push the hot nozzle/bellows assembly forward until the hot nozzle flange touches the APU exhaust duct flange.
(2)
Adjust the hot nozzle flange radially to the APU exhaust duct flange. The radial offset should be 0 +4 -4 mm (0.0 +0.16 -0.16 in.).
(3)
Position the clamp (3) on the exhaust coupling flanges with the lockbolts in the 3 and 9 o'clock position.
(4)
Secure the V-clamp (3). Torque the clamp lockbolts to between 0.81 and 0.93 m.daN (71.68 and 82.30 lbf.in).
(5)
Install the heat insulation upper (1) and lower (2) halves, connect the two halves with MISCELLANEOUS (Material No. 19-010).
(6)
Connect the two halves with corrosion-resistant steel lockwire 0.8mm (0.032in.) to the hot nozzle assembly studs.
5. Close-up
________ Subtask 49-81-00-410-050
A. Close Access
(1)
Make sure that the work area is clean and clear of tool(s) and other items.
(2)
Set the LIGHT control switch 11LJ to the off position.
(3)
Close the APU access doors 315AL , 316AR (Ref. TASK 52-41-00-410-001).
(4)
Remove the access platform(s). Subtask 49-81-00-865-052
B.
Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s): 1KD, 2KD
Subtask 49-81-00-860-057
C. Aircraft Maintenance Configuration
(1)
Pressurize the reservoirs of the hydraulic systems.
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