W DOC AIRBUS | TSM A320F

Leak Detection from the Loop B in the Left Wing

TASK 36-22-00-810-876-A
Leak Detection from the Loop B in the Left Wing

1. Possible Causes
  • CABLE ASSY [57HF]
  • wiring
  • OVHT SENS ELEMENT [63HF]
  • OVHT SENS ELEMENT [62HF]
  • OVHT SENS ELEMENT [61HF]
  • OVHT SENS ELEMENT [60HF]
  • OVERHEAT SENSING ELEM [59HF]
  • OVHT SENS ELEMENT [58HF]
  • OVHT SENS ELEMENT [78HF]
  • INTERCONNECTING CABLE [91HF]
  • SNSG ELEM-OVHT, L WING LOOP B [56HF]
  • SNSG ELEM-OVHT, L WING LOOP B [55HF]
  • SNSG ELEM-OVHT, L WING LOOP B [54HF]
  • SNSG ELEM-OVHT, L WING LOOP B [53HF]
  • CABLE-CONNECTING, L WING LOOP B [52HF]
  • CABLE-CONNECTING, L WING LOOP B [51HF]
  • SNSG ELEM-OVHT, L WING LOOP B [50HF]
  • SNSG ELEM-OVHT, L WING LOOP B [49HF]
  • SNSG ELEM-OVHT, L WING LOOP B [83HF]
  • CABLE-CONNECTING, L WING LOOP B [77HF]
  • duct
2. Job Set-up Information
 A. Fixtures, Tools, Test and Support Equipment
REFERENCE
QTY
DESIGNATION
9240SI
1
CONTROLLER-LOOP
 B. Referenced Information
REFERENCE
DESIGNATION
AMM 36-11-00-740-802
BITE Test of the Engine Bleed Air System (EBAS) (System Test)
AMM 36-11-34-000-001
Removal of the BMC
AMM 36-11-34-400-001
Installation of the BMC
AMM 36-11-48-000-003
Removal of the Bleed Air Ducts
AMM 36-11-48-400-004
Installation of the Bleed Air Ducts
AMM 36-11-48-790-802
Leak Check on Bleed Air Ducting in Wing Area between Bleed Air Precooler Wing Anti Ice Valve and Wing/Fuselage Connection
AMM 36-22-00-790-802
Leak Check on all the Bleed Air Ducts and Packs Components
ASM 362201
AMM 36-22-16-000-001
Removal of the Overheat Sensing Elements
AMM 36-22-16-000-002
Removal of the Cables
AMM 36-22-16-000-003
Removal of the Cables
AMM 36-22-16-000-004
Removal of the Overheat Sensing Elements
AMM 36-22-16-000-005
Removal of the Overheat Sensing Elements
AMM 36-22-16-000-006
Removal of the Overheat Sensing Elements
AMM 36-22-16-000-007
Removal of the Cables
AMM 36-22-16-400-001
Installation of the Overheat Sensing Elements
AMM 36-22-16-400-002
Installation of the Cables
AMM 36-22-16-400-003
Installation of the Cables
AMM 36-22-16-400-004
Installation of the Overheat Sensing Elements
AMM 36-22-16-400-005
Installation of the Overheat Sensing Elements
AMM 36-22-16-400-007
Installation of the Overheat Sensing Elements
AMM 36-22-16-400-008
Installation of the Cables
AMM 36-22-18-000-001
Removal of the Fuselage Overheat Sensing-Elements (Loop A and B)
AMM 36-22-18-400-001
Installation of the Fuselage Overheat Sensing-Elements (Loop A and B)
3. Fault Confirmation
Subtask 36-22-00-710-122-A ** ON A/C NOT FOR ALL
A. Test
NOTE: The overheat detection threshold is between 117 and 131 degrees Celsius.
An overheat detection by one loop can occur in these conditions:
  • High Outside Air Temperature (OAT)
  • ECS supplied with hot bleed air.
    In these conditions, the ambient air around the sensing elements can increase to the detection threshold but there is not an air leak.
    If there is an air leak, there will be an AIR L(R) WING LEAK warning on the ECAM.
    No other maintenance action is necessary if:
  • The overheat detection was by one loop only with high OAT and ECS supplied with hot bleed air.
  • The result of the EBAS BITE test is TEST OK.
   (1) Do the BITE test of the EBAS AMM 36-11-00-740-802.
4. Fault Isolation
Subtask 36-22-00-810-143-A ** ON A/C NOT FOR ALL
A. If the test gives the maintenance message:
L WING LOOP B
  • Remove BMC2 (1HA2) AMM 36-11-34-000-001.
  • On the shelf 96VU, connect the 9240SI CONTROLLER-LOOP between connector 1HA2-AA/4G and the ground ASM 362201.
  • Do a check of the impedance read on the 9240SI CONTROLLER-LOOP.
   (1) If the impedance is more than 10 kOhms:
  • Disconnect the 9240SI CONTROLLER-LOOP from the BMC2 connector.
  • Install BMC2 (1HA2) AMM 36-11-34-400-001.
  • Refer to Para. 4.C.
  • Do a check of the correct installation of the sensing elements along the bleed duct.
  • Do a wiring check.
   (2) If the impedance is less than 10 kOhms:
  • Do a visual inspection of the sensing elements and cables on the L wing loop B.
     (a) If a sensing element or cable is damaged:
     (b) If no sensing element is damaged:
  • Disconnect the connector between sensing elements 56HF (found in the wing) and 55HF (found in the wing).
  • Connect the 9240SI CONTROLLER-LOOP between connector 1HA2-AA/4G and the ground.
  • Do a check of the impedance read on the 9240SI CONTROLLER-LOOP.
NOTE: You must use a dichotomy method to find the defective sensing element:
  • Disconnect a connector in the middle of the loop.
  • Measure the resistance of one of the halves.
    If the measurement is correct, you must do a check of the other half.
    If the measurement is not correct, do the same operation in the defective half again until you find the defective sensing element.
The elements that follow can be found in the FUSELAGE:
       1 If the impedance is less than 10 kOhms:
  • Disconnect the connector between sensing elements 60HF and 59HF.
  • Do a check of the impedance read on the 9240SI CONTROLLER-LOOP.
         a If the impedance is less than 10 kOhms:
  • Disconnect the connector between sensing elements 63HF and 62HF.
  • Do a check of the impedance read on the 9240SI CONTROLLER-LOOP.

    * If the impedance is less than 302 kOhms:
    - Disconnect the connector between cable 57HF and sensing element 63HF.
    - Do a check of the impedance read on the 9240SI CONTROLLER-LOOP.

    ** If the impedance is less than 10 kOhms:
    - Replace the CABLE ASSY [57HF] AMM 36-22-18-000-001 and AMM 36-22-18-400-001.
    - Do a check of the impedance read on the 9240SI CONTROLLER-LOOP.

    *** If the impedance is less than 10 kOhms:
    - Do a check and repair the wiring between pin AA/4G of BMC2 (1HA2) and cable 57HF ASM 362201.
    - Connect all the cables or connectors disconnected.
    - Disconnect the 9240SI CONTROLLER-LOOP from the BMC2 connector.
    - Install BMC2 (1HA2) AMM 36-11-34-400-001.
    - Refer to Para. 4.C.

    *** If the impedance is more than 10 kOhms:
    - Connect all the cables or connectors disconnected.
    - Disconnect the 9240SI CONTROLLER-LOOP from the BMC2 connector.
    - Install BMC2 (1HA2) AMM 36-11-34-400-001.
    - Refer to Para. 4.C.

    ** If the impedance is more than 10 kOhms:
    - Replace the OVHT SENS ELEMENT [63HF] AMM 36-22-18-000-001 and AMM 36-22-18-400-001.
    - Connect all the cables or connectors disconnected.
    - Disconnect the 9240SI CONTROLLER-LOOP from the BMC2 connector.
    - Install BMC2 (1HA2) AMM 36-11-34-400-001.
    - Refer to Para. 4.C.

    * If the impedance is more than 302 kOhms:
    - Disconnect the connector between sensing elements 62HF and 61HF.
    - Connect the connector between sensing elements 63HF and 62HF.
    - Do a check of the impedance read on the 9240SI CONTROLLER-LOOP.

    ** If the impedance is less than 10 kOhms:
    - Replace the OVHT SENS ELEMENT [62HF] AMM 36-22-18-000-001 and AMM 36-22-18-400-001.
    - Connect all the cables or connectors disconnected.
    - Disconnect the 9240SI CONTROLLER-LOOP from the BMC2 connector.
    - Install BMC2 (1HA2) AMM 36-11-34-400-001.
    - Refer to Para. 4.C.

    ** If the impedance is more than 10 kOhms:
    - Disconnect the connector between sensing elements 61HF and 60HF.
    - Connect the connector between sensing elements 62HF and 61HF.
    - Do a check of the impedance read in the 9240SI CONTROLLER-LOOP.

    *** If the impedance is less than 10 kOhms:
    - Replace the OVHT SENS ELEMENT [61HF] AMM 36-22-18-000-001 and AMM 36-22-18-400-001.
    - Connect all the cables or connectors disconnected.
    - Disconnect the 9240SI CONTROLLER-LOOP from the BMC2 connector.
    - Install BMC2 (1HA2) AMM 36-11-34-400-001.
    - Refer to Para. 4.C.

    *** If the impedance is more than 10 kOhms:
    - Replace the OVHT SENS ELEMENT [60HF] AMM 36-22-18-000-001 and AMM 36-22-18-400-001.
    - Connect all the cables or connectors disconnected.
    - Disconnect the 9240SI CONTROLLER-LOOP from the BMC2 connector.
    - Install BMC2 (1HA2) AMM 36-11-34-400-001.
    - Refer to Para. 4.C.
         b If the impedance is more than 10 kOhms:
  • Disconnect the connector between sensing elements 58HF and 78HF.
  • Connect the connector between cables 60HF and 59HF.
  • Do a check of the impedance read on the 9240SI CONTROLLER-LOOP.

    * If the impedance is less than 10 kOhms:
    - Disconnect the connector between cables 59HF and 58HF.
    - Do a check of the impedance read on the 9240SI CONTROLLER-LOOP.

    ** If the impedance is less than 10 kOhms:
    - Replace the OVERHEAT SENSING ELEM [59HF] AMM 36-22-18-000-001 and AMM 36-22-18-400-001.
    - Connect all the cables or connectors disconnected.
    - Disconnect the 9240SI CONTROLLER-LOOP from the BMC2 connector.
    - Install BMC2 (1HA2) AMM 36-11-34-400-001.
    - Refer to Para. 4.C.

    ** If the impedance is more than 10 kOhms:
    - Replace the OVHT SENS ELEMENT [58HF] AMM 36-22-18-000-001 and AMM 36-22-18-400-001.
    - Connect all the cables or connectors disconnected.
    - Disconnect the 9240SI CONTROLLER-LOOP from the BMC2 connector.
    - Install BMC2 (1HA2) AMM 36-11-34-400-001.
    - Refer to Para. 4.C.

    * If the impedance is more than 10 kOhms:
    - Disconnect the connector between sensing elements 78HF (found in the wing) and 91HF (found in the fuselage).
    - Connect the connector between sensing elements 58HF and 78HF.
    - Do a check of the impedance read on the 9240SI CONTROLLER-LOOP.

    ** If the impedance is less than 10 kOhms:
    - Replace the OVHT SENS ELEMENT [78HF] AMM 36-22-18-000-001 and AMM 36-22-18-400-001.
    - Connect all the cables or connectors disconnected.
    - Disconnect the 9240SI CONTROLLER-LOOP from the BMC2 connector.
    - Install BMC2 (1HA2) AMM 36-11-34-400-001.
    - Refer to Para. 4.C.

    ** If the impedance is more than 10 kOhms:
    - Disconnect the connector between sensing elements 52HF (found in the wing) and 91HF (found in the fuselage).
    - Connect the connector between sensing elements 91HF and 78HF.
    - Do a check of the impedance read on the 9240SI CONTROLLER-LOOP.

    *** If the impedance is less than 10 kOhms:
    - Replace the INTERCONNECTING CABLE [91HF] (found in the wing) AMM 36-22-16-000-001 and AMM 36-22-16-400-001.
    - Connect all the cables or connectors disconnected.
    - Disconnect the 9240SI CONTROLLER-LOOP from the BMC2 connector.
    - Install BMC2 (1HA2) AMM 36-11-34-400-001.
    - Refer to Para. 4.C.

    *** If the impedance is more than 10 kOhms:
    - Replace the SNSG ELEM-OVHT, L WING LOOP B [56HF] (found in the wing) AMM 36-22-16-000-001 and AMM 36-22-16-400-001.
    - Connect all the cables or connectors disconnected.
    - Disconnect the 9240SI CONTROLLER-LOOP from the BMC2 connector.
    - Install BMC2 (1HA2) AMM 36-11-34-400-001.
    - Refer to Para. 4.C.

The elements that follow can be found in the WING:
       2 If the impedance is more than 10 kOhms:
  • Disconnect the connector between cables 52HF and 51HF.
  • Connect the connector between sensing elements 56HF and 55HF.
  • Do a check of the impedance read on the 9240SI CONTROLLER-LOOP.
         a If the impedance is less than 10 kOhms:
  • Disconnect the connector between sensing elements 54HF and 53HF.
  • Do a check of the impedance read on the 9240SI CONTROLLER-LOOP.

    * If the impedance is less than 10 kOhms:
    - Disconnect the connector between sensing elements 55HF and 54HF.
    - Do a check of the impedance read on the 9240SI CONTROLLER-LOOP.

    ** If the impedance is less than 10 kOhms:
    - Replace the SNSG ELEM-OVHT, L WING LOOP B [55HF] AMM 36-22-16-000-006 and AMM 36-22-16-400-007.
    - Connect all the cables or connectors disconnected.
    - Disconnect the 9240SI CONTROLLER-LOOP from the BMC2 connector.
    - Install BMC2 (1HA2) AMM 36-11-34-400-001.
    - Refer to Para. 4.C.

    ** If the impedance is more than 10 kOhms:
    - Replace the SNSG ELEM-OVHT, L WING LOOP B [54HF] AMM 36-22-16-000-005 and AMM 36-22-16-400-005.
    - Connect all the cables or connectors disconnected.
    - Disconnect the 9240SI CONTROLLER-LOOP from the BMC2 connector.
    - Install BMC2 (1HA2) AMM 36-11-34-400-001.
    - Refer to Para. 4.C.

    * If the impedance is more than 10 kOhms:
    - Disconnect the connector between sensing element 53HF and cable 52HF.
    - Connect the connector between sensing elements 54HF and 53HF.
    - Do a check of the impedance read on the 9240SI CONTROLLER-LOOP.

    ** If the impedance is less than 10 kOhms:
    - Replace the SNSG ELEM-OVHT, L WING LOOP B [53HF] AMM 36-22-16-000-004 and AMM 36-22-16-400-004.
    - Connect all the cables or connectors disconnected.
    - Disconnect the 9240SI CONTROLLER-LOOP from the BMC2 connector.
    - Install BMC2 (1HA2) AMM 36-11-34-400-001.
    - Refer to Para. 4.C.

    ** If the impedance is more than 10 kOhms:
    - Replace the CABLE-CONNECTING, L WING LOOP B [52HF] AMM 36-22-16-000-007 and AMM 36-22-16-400-008.
    - Connect all the cables or connectors disconnected.
    - Disconnect the 9240SI CONTROLLER-LOOP from the BMC2 connector.
    - Install BMC2 (1HA2) AMM 36-11-34-400-001.
    - Refer to Para. 4.C.
         b If the impedance is more than 10 kOhms:
  • Disconnect the connector between sensing elements 49HF and 83HF.
  • Connect the connector between cables 52HF and 51HF.
  • Do a check of the impedance read on the 9240SI CONTROLLER-LOOP.

    * If the impedance is less than 10 kOhms:
    - Disconnect the connector between cable 51HF and sensing element 50HF.
    - Do a check of the impedance read on the 9240SI CONTROLLER-LOOP.

    ** If the impedance is less than 10 kOhms:
    - Replace the CABLE-CONNECTING, L WING LOOP B [51HF] AMM 36-22-16-000-003 and AMM 36-22-16-400-003.
    - Connect all the cables or connectors disconnected.
    - Disconnect the 9240SI CONTROLLER-LOOP from the BMC2 connector.
    - Install BMC2 (1HA2) AMM 36-11-34-400-001.
    - Refer to Para. 4.C.

    ** If the impedance is more than 10 kOhms:
    - Disconnect the connector between sensing elements 50HF and 49HF.
    - Connect the connector between cable 51HF and sensing element 50HF.
    - Do a check of the impedance read on the 9240SI CONTROLLER-LOOP.

    *** If the impedance is less than 10 kOhms:
    - Replace the SNSG ELEM-OVHT, L WING LOOP B [50HF] AMM 36-22-16-000-005 and AMM 36-22-16-400-005.
    - Connect all the cables or connectors disconnected.
    - Disconnect the 9240SI CONTROLLER-LOOP from the BMC2 connector.
    - Install BMC2 (1HA2) AMM 36-11-34-400-001.
    - Refer to Para. 4.C.

    *** If the impedance is more than 10 kOhms:
    - Replace the SNSG ELEM-OVHT, L WING LOOP B [49HF] AMM 36-22-16-000-006 and AMM 36-22-16-400-007.
    - Connect all the cables or connectors disconnected.
    - Disconnect the 9240SI CONTROLLER-LOOP from the BMC2 connector.
    - Install BMC2 (1HA2) AMM 36-11-34-400-001.
    - Refer to Para. 4.C.

    * If the impedance is more than 10 kOhms:
    - Disconnect the connector between sensing element 83HF and cable 77HF.
    - Connect the connector between the sensing elements 49HF and 83HF.
    - Do a check of the impedance read on the 9240SI CONTROLLER-LOOP.

    ** If the impedance is less than 10 kOhms:
    - Replace the SNSG ELEM-OVHT, L WING LOOP B [83HF] AMM 36-22-16-000-001 and AMM 36-22-16-400-001.
    - Connect all the cables or connectors disconnected.
    - Disconnect the 9240SI CONTROLLER-LOOP from the BMC2 connector.
    - Install BMC2 (1HA2) AMM 36-11-34-400-001.
    - Refer to Para. 4.C.

    ** If the impedance is more than 10 kOhms:
    - Replace the CABLE-CONNECTING, L WING LOOP B [77HF] AMM 36-22-16-000-002 and AMM 36-22-16-400-002.
    - Connect all the cables or connectors disconnected.
    - Do a check of the impedance read on the 9240SI CONTROLLER-LOOP.

    *** If the impedance is less than 10 kOhms:
    - Do a check and repair the wiring between pin AA/5G of BMC2 (1HA2) and cable 77HF ASM 362201.
    - Disconnect the 9240SI CONTROLLER-LOOP from the BMC2 connector.
    - Install BMC2 (1HA2) AMM 36-11-34-400-001.
    - Refer to Para. 4.C.

    *** If the impedance is more than 10 kOhms:
    - Disconnect the 9240SI CONTROLLER-LOOP from the BMC2 connector.
    - Install BMC2 (1HA2) AMM 36-11-34-400-001.
    - Refer to Para. 4.C.
Subtask 36-22-00-810-144-A ** ON A/C NOT FOR ALL
B. If the test gives the TEST OK message:
Subtask 36-22-00-710-123-A ** ON A/C NOT FOR ALL
C. Do the test given in Para. 3.
[Rev.8 from Aug 2018] 2026.04.04 04:34:09 UTC
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