W DOC AIRBUS | AMM A320F

Deactivation of the AFT Cargo Compartment-Heating Pressure-Regulating Valve

TASK 21-43-00-040-003-A
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.
ZONE: 197
FIN: 11HC ** ON A/C NOT FOR ALL
Task Summary
Access Test Specific Tools Mhr E/T Nb Men
YESNONO0.70.71
1. Reason for the Job
MMEL 21-43-02B
AFT CARGO COMPARTMENT HEATING
2. Job Set-up Information
 A. Fixtures, Tools, Test and Support Equipment
REFERENCE
QTY
DESIGNATION
No specific
1
ACCESS PLATFORM 2M (6 FT)
No specific
AR
CAP - BLANKING
No specific
AR
SAFETY CLIP - CIRCUIT BREAKER
 B. Work Zones and Access Panels
ZONE/ACCESS
ZONE DESCRIPTION
197
REAR FAIRING
197BB
197KB
 C. Referenced Information
REFERENCE
DESIGNATION
TASK 24-41-00-861-002-A
Energize the Aircraft Electrical Circuits from the External Power
TASK 24-41-00-861-002-A-01
Energize the Aircraft Electrical Circuits from the APU
TASK 24-41-00-861-002-A-02
Energize the Aircraft Electrical Circuits from Engine 1(2)
TASK 24-41-00-862-002-A
De-energize the Aircraft Electrical Circuits Supplied from the External Power
TASK 24-41-00-862-002-A-01
De-energize the Aircraft Electrical Circuits Supplied from the APU
TASK 24-41-00-862-002-A-02
De-energize the Aircraft Electrical Circuits Supplied from the Engine 1(2)
TASK 53-35-13-000-002-A
Removal of the Quick-Release Access Panels from the Belly Fairing Structure
TASK 53-35-13-400-002-A
Installation of the Quick-Release Access Panels on the Belly Fairing Structure
F AFT Cargo Compartment-Heating Pressure-Regulating Valve ** ON A/C NOT FOR ALL
F AFT Cargo Compartment-Heating Pressure-Regulating Valve ** ON A/C NOT FOR ALL
3. Job Set-up
Subtask 21-43-00-861-060-A ** ON A/C NOT FOR ALL
A. Energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-861-002).
Subtask 21-43-00-865-061-A ** ON A/C NOT FOR ALL
B. Open, safety and tag this(these) circuit breaker(s):
PANELDESIGNATIONFINLOCATION
** ON A/C NOT FOR ALL
49VUAIR COND/AFT CARGO/VENT/CTL & MONG31HNC07
** ON A/C NOT FOR ALL
49VUAIR COND/AFT CARGO/VENT & HTG/CTL & MONG31HNC07
Subtask 21-43-00-941-059-A ** ON A/C NOT FOR ALL
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.
Subtask 21-43-00-010-056-A ** ON A/C NOT FOR ALL
D. Get Access
   (1) Put the ACCESS PLATFORM 2M (6 FT) in position at the access panel 197BB.
   (2) Remove the access panel 197BB (Ref. AMM TASK 53-35-13-000-002).
Subtask 21-43-00-010-056-C ** ON A/C NOT FOR ALL
D. Get Access
   (1) Put the ACCESS PLATFORM 2M (6 FT) in position at the access panel 197KB.
   (2) Remove the access panel 197KB (Ref. AMM TASK 53-35-13-000-002).
4. Procedure
Subtask 21-43-00-040-052-A ** ON A/C NOT FOR ALL
A. Deactivation of the AFT Cargo Compartment-Heating Pressure Regulating Valve
WARNING: DO NOT TOUCH THE COMPONENT UNTIL IT IS SUFFICIENTLY COOL TO PREVENT BURNS.
   (1) Turn the manual overide handwheel (2) to close the pressure regulating valve.
   (2) Engage the locking device on the manual overide handwheel (2) to safety the pressure regulating valve in the closed position.
   (3) Disconnect the electrical connector (1) and temporarily attach it to the aircraft structure.
   (4) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
5. Close-up
Subtask 21-43-00-865-090-A ** ON A/C NOT FOR ALL
A. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):
PANELDESIGNATIONFINLOCATION
** ON A/C NOT FOR ALL
49VUAIR COND/AFT CARGO/VENT/CTL & MONG31HNC07
** ON A/C NOT FOR ALL
49VUAIR COND/AFT CARGO/VENT & HTG/CTL & MONG31HNC07
Subtask 21-43-00-410-055-A ** ON A/C NOT FOR ALL
B. Close Access
   (1) Make sure that the work area is clean and clear of tools and other items.
   (2) Install the access panel 197BB (Ref. AMM TASK 53-35-13-400-002).
   (3) Remove the access platform(s).
   (4) Remove the WARNING NOTICE(S).
   (5) Put a warning notice in the cockpit to tell the flight crew that the pressure regulating valve is deactivated.
   (6) Record the deactivation of the pressure regulating valve in the aircraft technical log book.
Subtask 21-43-00-410-055-C ** ON A/C NOT FOR ALL
B. Close Access
   (1) Make sure that the work area is clean and clear of tools and other items.
   (2) Install the access panel 197KB (Ref. AMM TASK 53-35-13-400-002).
   (3) Remove the access platform(s).
   (4) Remove the WARNING NOTICE(S).
   (5) Put a warning notice in the cockpit to tell the flight crew that the pressure regulating valve is deactivated.
   (6) Record the deactivation of the pressure regulating valve in the aircraft technical log book.
Subtask 21-43-00-862-057-A ** ON A/C NOT FOR ALL
C. De-energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-862-002).
[Rev.10 from 2021] 2026.04.02 06:11:18 UTC
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