Subtask 21-43-34-865-055
 B. Remove the safety clip(s) and the tag(s) and close this(these) circuit
 breaker(s): R 31HN
 Subtask 21-43-34-710-051
 C. Do an operational test of the AFT cargo compartment heating system (Ref. TASK 21-43-00-710-003).
 5. Close-up
________
 Subtask 21-43-34-410-051

 A. Close Access
 (1)
 Make sure that the work area is clean and clear of tool(s) and other items.

 (2)
 Close the access door 811.

 (3) Remove the access platform(s).
 Subtask 21-43-34-862-051

 B. De-energize the ground service network
 (Ref. TASK 24-42-00-862-001).

 VALVE - TRIM AIR, AFT CARGO COMPARTMENT (12HC) - REMOVAL/INSTALLATION
_____________________________________________________________________
 TASK 21-43-51-000-001
 Removal of the Aft Cargo-Trim Air-Valve (12HC)
 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

__________________
 Self Explanatory

 2.
 Job Set-up Information

______________________
 A. Fixtures, Tools, Test and Support Equipment
 -------------------------------------------------------------------------------
REFERENCE  QTY DESIGNATION
 -------------------------------------------------------------------------------
No specific blanking caps
 No specific blanking plugs
 No specific circuit breaker(s) safety clip(s)
 No specific access platform 2.0 m (6 ft. 7 in.)

 B. Referenced Information
 -------------------------------------------------------------------------------
REFERENCE  DESIGNATION
 -------------------------------------------------------------------------------
24-41-00-861-002  Energize the Aircraft Electrical Circuits from the External Power
 53-35-13-000-002  Removal of the Quick-Release Access Panels from the Belly Fairing Structure

R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 401-499,
 21-43-51-991-001 Fig. 401
 **ON A/C 301-399,

 21-43-51-991-001-A  Fig. 401A **ON A/C ALL

 3. Job Set-up
__________
 Subtask 21-43-51-861-050

 A. Energize the aircraft electrical circuits (Ref. TASK 24-41-00-861-002). Subtask 21-43-51-865-050
 B. Open, safety and tag this(these) circuit breaker(s):
 -------------------------------------------------------------------------------
PANEL DESIGNATION IDENT. LOCATION
 -------------------------------------------------------------------------------

R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 301-399,
 122VU AIR COND/AFT CARGO VENT/FAN 30HN S22 R **ON A/C ALL
 Subtask 21-43-51-865-055
 C. Open, safety and tag this(these) circuit breaker(s):
 -------------------------------------------------------------------------------
PANEL DESIGNATION FIN LOCATION
 -------------------------------------------------------------------------------
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 21-43-51-941-050
 D. 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 pushbutton 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 21-43-51-010-050
 E. 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 21-43-51-010-050-A
 E. Get Access
 (1) Put the access platform in position at the access panel 197KB.
　
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