W DOC AIRBUS | AMM A320F

Removal of the APU Overheat Sensing-Elements

TASK 36-22-17-000-001-A
Removal of the APU Overheat Sensing-Elements

WARNING: MAKE SURE THAT THE PNEUMATIC SYSTEM IS DEPRESSURIZED BEFORE YOU START WORK. PRESSURIZED AIR CAN CAUSE INJURY TO PERSONNEL.
NOTE: The removal procedure for all sensing elements of the leak detection system (single loop 125 degree) is the same.
FIN: 11HF
FIN: 12HF
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FIN: 15HF
FIN: 16HF
FIN: 17HF
FIN: 18HF
FIN: 19HF
FIN: 20HF
FIN: 84HF ** ON A/C NOT FOR ALL
1. Reason for the Job
Self explanatory
2. Job Set-up Information
 A. Fixtures, Tools, Test and Support Equipment
REFERENCE
QTY
DESIGNATION
No specific
AR
ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE
No specific
AR
SAFETY CLIP - CIRCUIT BREAKER
 B. Work Zones and Access Panels
ZONE/ACCESS
ZONE DESCRIPTION
151BW, 161AW, 161BW, 161CW, 161DW, 312AR, 314AR
151CW, 151DW, 151EW, 151HW, 151JW
197BB
151RW, 197KB
151SW, 151TW, 151UW, 151VW
 C. Referenced Information
REFERENCE
DESIGNATION
TASK 25-55-11-000-001-A
Removal of the Aft Cargo-Compartment Partition at FR47
TASK 25-55-12-000-001-A
Removal of the Aft Cargo-Compartment Partition at FR65
TASK 52-30-00-860-001-A
Open the FWD or Aft Cargo-Compartment Door with the Yellow Electric Pump
F APU Overheat Sensing-Elements ** ON A/C NOT FOR ALL
F APU Overheat Sensing-Elements ** ON A/C NOT FOR ALL
3. Job Set-up
Subtask 36-22-17-865-050-A
A. Open, safety and tag this(these) circuit breaker(s):
PANELDESIGNATIONFINLOCATION
** ON A/C NOT FOR ALL
49VUAIR BLEED/ENG 1/CTL3HA1D12
49VUAIR BLEED/ENG 1/MONG2HA1D11
** ON A/C ALL
49VUAIR BLEED/X FEED/VALVE/BAT2HVD13
** ON A/C NOT FOR ALL
49VUAIR BLEED/ENG 2/MONG3HA2D12
49VUAIR BLEED/ENG 1/CTL2HA1D11
** ON A/C NOT FOR ALL
122VUAIR BLEED/ENG 2/CTL3HA2Z23
122VUAIR BLEED/ENG 2/MONG2HA2Z22
** ON A/C ALL
122VUAIR BLEED/X FEED VALVE/NORM1HVZ20
** ON A/C NOT FOR ALL
122VUAIR BLEED/ENG 1/MONG3HA1Z23
122VUAIR BLEED/ENG 2/CTL2HA2Z22
Subtask 36-22-17-010-050-A ** ON A/C NOT FOR ALL
B. Get Access
NOTE: To remove the necessary APU overheat sensing elements, remove only the related access panels.
   (1) Get access to the overheat sensing elements between FR49 and FR50:
     (a) Put the ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE in position.
     (b) Remove the access panel 197BB.
   (2) Get access to the APU overheat sensing elements between FR46 and FR70 from the AFT cargo compartment:
     (a) Open the AFT cargo compartment door (Ref. AMM TASK 52-30-00-860-001).
     (b) Remove the applicable access panels for the APU overheat sensing elements:
  • between the FR46 and FR47
    remove the partition panel 151BW (Ref. AMM TASK 25-55-11-000-001)
  • between the FR47 and FR49
    remove the access panel 151CW
  • between the FR49 and FR52
    remove the access panel 151DW
  • between the FR52 and FR55
    remove the access panel 151EW
  • between the FR55 and FR58
    remove the access panel 151HW
  • between the FR58 and FR59
    remove the access panel 151JW
  • between the FR59 and FR62
    remove the access panel 161AW
  • between the FR62 and FR63
    remove the access panel 161BW
  • between the FR63 and FR65
    remove the access panel 161CW
  • between the FR65 and FR70
    remove the partition panel 161DW (Ref. AMM TASK 25-55-12-000-001).
   (3) Get access to the APU overheat sensing elements aft of FR70.
     (a) Put the ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE below the rear fuselage.
     (b) Open the applicable access door for the APU overheat sensing elements:
  • between the FR70 and FR77
    open the access door 312AR,
  • aft of FR77
    open the access door 314AR.
Subtask 36-22-17-010-050-B ** ON A/C NOT FOR ALL
B. Get Access
NOTE: To remove the necessary APU overheat sensing elements, remove only the related access panels.
   (1) Get access to the APU overheat sensing elements between FR49 and FR50:
     (a) Put the ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE in position.
     (b) Remove the access panel 197KB.
   (2) Get access to APU overheat sensing elements between FR46 and FR70 from the AFT cargo compartment:
     (a) Open the AFT cargo compartment door (Ref. AMM TASK 52-30-00-860-001).
     (b) Remove the applicable access panels for the APU overheat sensing elements:
  • between the FR46 and FR47
    remove the partition panel 151BW (Ref. AMM TASK 25-55-11-000-001)
  • between the FR47 and FR47.4
    remove the access panel 151RW
  • between the FR47.4 and FR49
    remove the access panel 151CW
  • between the FR49 and FR52
    remove the access panel 151DW
  • between the FR52 and FR55
    remove the access panel 151EW
  • between the FR55 and FR58
    remove the access panel 151HW
  • between the FR58 and FR59
    remove the access panel 151JW
  • between the FR59 and FR62
    remove the access panel 161AW
  • between the FR62 and FR63
    remove the access panel 161BW
  • between the FR63 and FR65
    remove the access panel 161CW
  • between the FR65 and FR70
    remove the partition panel 161DW (Ref. AMM TASK 25-55-12-000-001).
   (3) Get access to the APU overheat sensing elements aft of FR70.
     (a) Put the ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE below the rear fuselage.
     (b) Open the applicable access door for the APU overheat sensing elements:
  • between the FR70 and FR77
    open the access door 312AR,
  • aft of FR77
    open the access door 314AR.
Subtask 36-22-17-010-050-C ** ON A/C NOT FOR ALL
B. Get Access
NOTE: To remove the necessary APU overheat sensing elements, remove only the related access panels.
   (1) Get access to the APU overheat sensing elements between FR49 and FR50:
     (a) Put the ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE in position.
     (b) Remove the access panel 197BB.
   (2) Get access to the APU bleed-air ducts between FR46 and FR70 from the AFT cargo compartment:
     (a) Open the AFT cargo compartment door (Ref. AMM TASK 52-30-00-860-001).
     (b) Remove the applicable access panels for the APU bleed-air ducts:
  • between the FR46 and FR53
    remove the partition panel 151BW (Ref. AMM TASK 25-55-11-000-001) and remove the access panel 151SW
  • between the FR53 and FR56
    remove the access panel 151TW
  • between the FR56 and FR58
    remove the access panel 151UW
  • between the FR58 and FR59
    remove the access panel 151VW
  • between the FR59 and FR62
    remove the access panel 161AW
  • between the FR62 and FR63
    remove the access panel 161BW
  • between the FR63 and FR65
    remove the access panel 161CW
  • between the FR65 and FR70
    remove the partition panel 161DW (Ref. AMM TASK 25-55-12-000-001).
   (3) Get access to the APU overheat sensing elements aft of FR70.
     (a) Put the ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE below the rear fuselage.
     (b) Open the applicable access door for the APU overheat sensing elements:
  • between the FR70 and FR77
    open the access door 312AR,
  • aft of FR77
    open the access door 314AR.
4. Procedure
Subtask 36-22-17-020-051-A
A. Removal of the Sensing Elements
CAUTION: REMOVE OR INSTALL THE SENSING ELEMENTS CAREFULLY. DO NOT TWIST, BEND OR CAUSE KINKS IN THE SENSING ELEMENTS. IF YOU DO, YOU CAN CAUSE DAMAGE TO THEM.
   (1) Remove and discard the lockwire from the bracket and the union nut (2).
   (2) Loosen the union nut (2).
   (3) Remove and discard the lockwire from the bracket and the retaining nut (1).
   (4) Remove the retaining nut (1).
   (5) Remove the bonding jumper from the socket.
   (6) Attach the sensing element to the bracket.
   (7) Put blanking caps on the disconnected electrical connector(s) and on the receptacle(s).
   (8) Loosen the camloc (3) and open the clamp (5).
   (9) Remove the sensing element with the attached grommet (4) from the clamp (5).
   (10) Remove the grommet (4) from the sensing element.
   (11) On the bulkhead remove and discard the lockwire from the union nut (2) and the bulkhead connection (6).
   (12) Loosen the union nut (2).
   (13) Remove the bulkhead connection (6), the sealing ring (7) and the washer (8).
   (14) Put blanking caps on the disconnected connector(s).
[Rev.10 from 2021] 2026.04.01 01:17:20 UTC
"Aviabrain" 2025