A. Energize the aircraft electrical circuits (Ref. TASK 24-41-00-861-002).
Subtask 21-43-00-865-056
B. Open, safety and tag this(these) circuit breaker(s):
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PANEL DESIGNATION FIN LOCATION
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122VU AIR COND/AFT CARGO VENT/CTL AND/MONG 31HN 20 S
or alternative location :-
49VU AIR COND/AFT CARGO/VENT/CTL & MONG 31HN 07 C
Subtask 21-43-00-941-058
C. Safety Precautions
(1)
On the panel 30VU:
(a)
Make sure that:
-
the APU BLEED pushbutton switch is in the off position (the ON legend is off) and,
-
the ENG 1 BLEED and the ENG 2 BLEED pushbutton switches are in the off position (the OFF legends are on).
(b)
Put a warning notice in position to tell persons not to operate these switches.
(2)
On the HP ground connector put a warning notice in position to tell persons not to supply the ground air.
R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 401-499,
Subtask 21-43-00-010-058
D. Get Access
(1)
Put the access platform in position at the access panel 197BB.
(2)
Remove the access panel 197BB (Ref. TASK 53-35-13-000-002).
**ON A/C 301-399,
Subtask 21-43-00-010-058-A
D. Get Access
(1) Put the access platform in position at the access panel 197KB.
(2) Remove the access panel 197KB (Ref. TASK 53-35-13-000-002).
**ON A/C ALL
4. Procedure
_________
Subtask 21-43-00-440-051
A. Reactivation of the Trim Air Valve WARNING : DO NOT TOUCH THE COMPONENT UNTIL IT IS SUFFICIENTLY
_______
COOL TO PREVENT BURNS.
(1)
Remove the quick-release pin (4) from the manual overide lever (2).
(2)
Install the quick-release pin (4) in the stowage hole in the body of the trim air valve.
(3)
Turn the manual overide lever (2) to open the trim air valve.
(4)
Remove the temporary attachment and the blanking caps from the electrical connectors (1) and reconnect them.
Subtask 21-43-00-865-067
B. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s): 31HN.
Subtask 21-43-00-810-052
R C. Do the trouble shooting of the trim air valve 12HC (Ref. TSM ATA 21) and do the applicable corrective maintenance procedure(s).
5. Close-up
________ R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 401-499,
Subtask 21-43-00-410-057
A. Close Access
(1)
Make sure that the work area is clean and clear of tool(s) and other items.
(2)
Install the access panel 197BB.
(3)
Remove the access platform(s).
(4) Remove the warning notice(s).
**ON A/C 301-399,
Subtask 21-43-00-410-057-A
A. Close Access
(1)
Make sure that the work area is clean and clear of tool(s) and other items.
(2)
Install the access panel 197KB.
(3)
Remove the access platform(s).
(4) Remove the warning notice(s).
**ON A/C ALL
Subtask 21-43-00-862-061
B. De-energize the aircraft electrical circuits (Ref. TASK 24-41-00-862-002).
TASK 21-43-00-040-003
Deactivation of the AFT Cargo Compartment-Heating Pressure-Regulating Valve
WARNING : MAKE SURE THAT AIR IS NOT SUPPLIED TO THE AIR CONDITIONING SYSTEM
_______ FROM THE MAIN ENGINE, THE APU OR A GROUND SOURCE. HOT COMPRESSED AIR CAN CAUSE INJURY TO PERSONNEL.
1. Reason for the Job
__________________
Refer to the MMEL TASK: 21-43-02 b)
Cargo Compartment Heating
Aft Cargo Compartment Heating
2. Job Set-up Information
______________________
A. Fixtures, Tools, Test and Support Equipment
-------------------------------------------------------------------------------REFERENCE QTY DESIGNATION
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