W DOC AIRBUS | TSM A320F

EPSU - External Load Fault

TASK 33-51-00-810-808-A
EPSU - External Load Fault

1. Possible Causes
  • POWER-EMERGENCY SUPPLY [10WL]
  • ESCAPE SLIDE FWD L [7500MM]
  • ESCAPE SLIDE FWD R [7501MM]
  • wiring
  • PROX SW-HANDLE, R FWD ESC SLIDE [4WN2]
  • PROX SW-HANDLE, R FWD PAX/CREW DOOR [13WV2]
  • PROX SW-HANDLE, L FWD ESC SLIDE [4WN1]
  • PROX SW-HANDLE, L FWD PAX/CREW DOOR [13WV1]
  • PROXIMITY SWITCH 4WN1
  • PROXIMITY SWITCH 13WV1
  • PROXIMITY SWITCH 4WN2
  • PROXIMITY SWITCH 13WV2
  • EPSU [11WL]
  • lamp(s)
  • LIGHT-FWD EMER, OVERWING [61WL]
  • LIGHT-AFT EMER, OVERWING [63WL]
  • ESCAPE SLIDE OFFWING L [7504MM]
  • PROX SW-HANDLE, L AFT EMER EXIT ESC SLIDE [6WN1]
  • PROX SW-HANDLE FLAP, L AFT EMER EXIT [21WV1]
  • PROXIMITY SWITCH 6WN1
  • PROXIMITY SWITCH 21WV1
  • EPSU [12WL]
  • LIGHT-FWD EMER, OVERWING [60WL]
  • LIGHT-AFT EMER, OVERWING [62WL]
  • ESCAPE SLIDE OFFWING R [7505MM]
  • PROX SW-HANDLE, R AFT EMER EXIT ESC SLIDE [6WN2]
  • PROX SW-HANDLE FLAP, R AFT EMER EXIT [21WV2]
  • PROXIMITY SWITCH 6WN2
  • PROXIMITY SWITCH 21WV2
  • EPSU [13WL]
  • ESCAPE SLIDE AFT L [7502MM]
  • ESCAPE SLIDE AFT R [7503MM]
  • PROX SW-HANDLE, R AFT ESC SLIDE [7WN2]
  • PROX SW-HANDLE, R AFT PAX/CREW DOOR [17WV2]
  • PROX SW-HANDLE, L AFT ESC SLIDE [7WN1]
  • PROX SW-HANDLE, L AFT PAX/CREW DOOR [17WV1]
  • PROXIMITY SWITCH 7WN1
  • PROXIMITY SWITCH 17WV1
  • PROXIMITY SWITCH 7WN2
  • PROXIMITY SWITCH 17WV2
2. Job Set-up Information
 A. Referenced Information
REFERENCE
DESIGNATION
TSM TASK 33-51-00-810-807-A
EPSU - Internal Load Fault Message
AMM 25-62-42-000-001
Offwing Escape-Slide - Removal
AMM 25-62-42-400-001
Offwing Escape-Slide - Installation
AMM 25-62-44-000-002
Removal of the Left-Hand Escape-Slide Pack-Assembly
AMM 25-62-44-400-006
Installation of the Left-Hand Escape-Slide Pack-Assembly
AMM 33-51-00-710-001
Operational Test of the Emergency Lights
AMM 33-51-00-710-006
Operational Test of Emergency Lights not with CIDS
AMM 33-51-00-720-001
Check of the Door Switch Power Supply from the Emer. Light System and of the Door Switch Operation for the Exterior Lights
ASM 335101
ASM 335102
ASM 335104
AWM 335104
AMM 33-51-15-000-001
Removal of the Emergency Overwing Lights
AMM 33-51-15-400-001
Installation of the Emergency Overwing Lights 60WL
AMM 33-51-38-000-001
Removal of the Emergency Power-Supply Unit (EPSU)
AMM 33-51-38-400-001
Installation of the Emergency Power-Supply Unit (EPSU)
AMM 52-71-11-000-001
Removal of the Proximity Switches of the Passenger/Crew Doors
AMM 52-71-11-400-001
Installation of the Proximity Switches of the Passenger/Crew Door
AMM 52-71-13-000-001
Removal of the Proximity Switches
AMM 52-71-13-400-001
Installation of the Proximity Switches
AMM 52-73-11-000-001
Removal of the Proximity Switches of the FWD Passenger/Crew Doors
AMM 52-73-11-000-002
Removal of the Proximity Switches of the Aft Passenger/Crew Doors
AMM 52-73-11-000-004
Removal of the Proximity Switches of the Aft Emergency Exits
AMM 52-73-11-400-001
Installation of the Proximity Switches of the FWD Passenger/Crew Doors
AMM 52-73-11-400-002
Installation of the Proximity Switches of the Aft Passenger/Crew Doors
AMM 52-73-11-400-004
Installation of the Proximity Switches of the Aft Emergency Exits
3. Fault Confirmation
CAUTION: DO NOT USE THE TEACH-IN PROCEDURE AS AN ALTERNATIVE FOR TROUBLESHOOTING. A TEACH-IN PROCEDURE IS NOT A RESET PROCEDURE. BEFORE YOU DO A TEACH-IN PROCEDURE, MAKE SURE THAT YOU CORRECTED ALL FAILURES. IF YOU DO NOT OBEY THIS, FAILURES CAN CAUSE A MALFUNCTION OF THE CABIN EMERGENCY LIGHTING SYSTEM.
Subtask 33-51-00-710-064-A ** ON A/C NOT FOR ALL
A. Do the operational test of the emergency lighting system AMM 33-51-00-710-001.
4. Fault Isolation
Subtask 33-51-00-810-074-A ** ON A/C NOT FOR ALL
A. If the test gives a different maintenance message, do the trouble shooting procedure related to the maintenance message.
Subtask 33-51-00-810-057-B ** ON A/C NOT FOR ALL
B. If the operational test gives the maintenance message
EPSU EXT LOAD FWD L:
   (1) If the green LED 'SYSTEM OK' comes on:
   (2) If the red LED 'EXTERIOR LIGHTS FAULT' comes on and a correct adapter cable between the escape slide and the aircraft electrical connector is available:
NOTE: A fault in one of the two forward escape slides can cause the LED to come on.
NOTE: For tests, it is necessary to use one of the items of equipment that follow:
  • A connector with four lamps (6V, 0.2 amps) in parallel
  • A connector with a 7.5 ohm, 5 watt resistor
  • A serviceable escape slide.
     (a) Do the procedures that follow:
NOTE: The step that follows gives the connection of the escape slide only. With one of the other possible items the procedure is the same.
  • connect a serviceable escape slide with the adapter cable to the pins A and B of the connector 2871.
     (b) If the fault no longer exists:
     (c) If the fault continues:
  • connect the ESCAPE SLIDE FWD L [7500MM] electrically only.
  • remove the ESCAPE SLIDE FWD R [7501MM] as necessary to get access to the electrical connector AMM 25-62-44-000-002.
NOTE: The step that follows gives the connection of the escape slide only. With one of the other possible items, the procedure is the same.
  • connect a serviceable escape slide with the adapter cable to the pins A and B of the connector 2870.
     (d) If the fault no longer exists:
     (e) If the fault continues:
  • do a check and repair the wiring between:
    escape slide connector 2870VC pin A and EPSU (10WL) pin F,
    escape slide connector 2870VC pin B and GND,
    PROX SW-HANDLE, R FWD ESC SLIDE [4WN2] pin E and EPSU (10WL) pin S,
    PROX SW-HANDLE, R FWD ESC SLIDE [4WN2] pin F and GND,
    PROX SW-HANDLE, R FWD PAX/CREW DOOR [13WV2] pin E and EPSU (10WL) pin <K,
    PROX SW-HANDLE, R FWD PAX/CREW DOOR [13WV2] pin F and GND
    ASM 335101 and AWM 335104.
     (f) If the fault no longer exists:
     (g) If the fault continues:
  • do a check and repair the wiring between:
    escape slide connector 2871VC pin A and EPSU (10WL) pin T,
    escape slide connector 2871VC pin B and GND,
    PROX SW-HANDLE, L FWD ESC SLIDE [4WN1] pin E and EPSU (10WL) pin C,
    PROX SW-HANDLE, L FWD ESC SLIDE [4WN1] pin F and GND,
    PROX SW-HANDLE, L FWD PAX/CREW DOOR [13WV1] pin E and EPSU (10WL) pin D,
    PROX SW-HANDLE, L FWD PAX/CREW DOOR [13WV1] pin F and GND
    ASM 335101 and AWM 335104.
  • install the used ESCAPE SLIDE FWD L [7500MM] AMM 25-62-44-400-006.
  • install the used ESCAPE SLIDE FWD R [7501MM] AMM 25-62-44-400-006.
     (h) If the fault continues:
     (i) If the fault continues:
     (j) If the fault continues:
     (k) If the fault continues:
   (3) If the red LED 'EXTERIOR LIGHTS FAULT' comes on and no correct adapter cable between the escape slide and the aircraft electrical connector is available:
NOTE: A fault in one of the two forward escape slides can cause the LED to come on.
NOTE: For tests, it is necessary to use one of the items of equipment that follow:
  • A connector with four lamps (6V, 0.2 amps) in parallel
  • A connector with a 7.5 ohm, 5 watt resistor
  • A serviceable escape slide.
The procedure that follows gives the connection of a serviceable escape slide.
     (a) Do the procedures that follow:
     (b) If the fault no longer exists:
     (c) If the fault continues:
  • connect the removed ESCAPE SLIDE FWD L [7500MM] electrically only.
  • remove the ESCAPE SLIDE FWD R [7501MM] AMM 25-62-44-000-002.
  • connect a serviceable escape slide electrically only.
     (d) If the fault no longer exists:
     (e) If the fault continues:
  • do a check and repair the wiring between:
    escape slide connector 2870VC pin A and EPSU (10WL) pin F,
    escape slide connector 2870VC pin B and GND,
    PROX SW-HANDLE, R FWD ESC SLIDE [4WN2] pin E and EPSU (10WL) pin S,
    PROX SW-HANDLE, R FWD ESC SLIDE [4WN2] pin F and GND,
    PROX SW-HANDLE, R FWD PAX/CREW DOOR [13WV2] pin E and EPSU (10WL) pin <K,
    PROX SW-HANDLE, R FWD PAX/CREW DOOR [13WV2] pin F and GND
    ASM 335101 and AWM 335104.
     (f) If the fault no longer exists:
     (g) If the fault continues:
  • do a check and repair the wiring between:
    escape slide connector 2871VC pin A and EPSU (10WL) pin T,
    escape slide connector 2871VC pin B and GND,
    PROX SW-HANDLE, L FWD ESC SLIDE [4WN1] pin E and EPSU (10WL) pin C,
    PROX SW-HANDLE, L FWD ESC SLIDE [4WN1] pin F and GND,
    PROX SW-HANDLE, L FWD PAX/CREW DOOR [13WV1] pin E and EPSU (10WL) pin D,
    PROX SW-HANDLE, L FWD PAX/CREW DOOR [13WV1] pin F and GND
    ASM 335101 and AWM 335104.
  • install the used ESCAPE SLIDE FWD L [7500MM] AMM 25-62-44-400-006.
  • install the removed ESCAPE SLIDE FWD R [7501MM] again AMM 25-62-44-400-006.
     (h) If the fault continues:
     (i) If the fault continues:
     (j) If the fault continues:
     (k) If the fault continues:
   (4) If the red LED 'EXTERIOR LIGHTS FAULT' and the red LED 'INTERIOR LIGHTS FAULT' flash:
     (a) If the fault continues:
     (b) If the fault continues:
  • do a check for a short to ground and repair the wiring if necessary ASM 335101 and ASM 335104:
    from EPSU (10WL) pin F to the connector(s) of the related signs and lights,
    from EPSU (10WL) pin T to the connector(s) of the related signs and lights,
    from EPSU (10WL) pin C to the connector of the PROXIMITY SWITCH 4WN1 ,
    from EPSU (10WL) pin D to the connector of the PROXIMITY SWITCH 13WV1 ,
    from EPSU (10WL) pin S to the connector of the PROXIMITY SWITCH 4WN2 ,
    from EPSU (10WL) pin <K to the connector of the PROXIMITY SWITCH 13WV2 ,
    from EPSU (10WL) pin <Q to the connector(s) of the proximity switches,
  • if you find a short to ground in the wiring, replace the POWER-EMERGENCY SUPPLY [10WL] AMM 33-51-38-000-001 and AMM 33-51-38-400-001.
     (c) If the fault continues:
Subtask 33-51-00-810-087-D ** ON A/C NOT FOR ALL
C. If the operational test gives the maintenance message
EPSU EXT LOAD EMER L:
   (1) If the green LED 'SYSTEM OK' comes on:
   (2) If the red LED 'EXTERIOR LIGHTS FAULT' comes on, do the test of the left escape-hatch switches of the emergency-exit escape-slide lighting AMM 33-51-00-720-001.
     (a) If one or more lamps of the LIGHT-FWD EMER, OVERWING (61WL) and the LIGHT-AFT EMER, OVERWING (63WL) do not come on:
       1 If the fault continues:
     (b) If all lamps of the LIGHT-FWD EMER, OVERWING (61WL) and the LIGHT-AFT EMER, OVERWING (63WL) come on and a correct adapter cable between the escape slide and the aircraft electrical connector is available:
  • remove the ESCAPE SLIDE OFFWING L [7504MM] as necessary to get access to the electrical connector AMM 25-62-42-000-001.
  • connect a serviceable escape slide with the adapter cable to the aircraft.
  • do the operational test of the emergency lights not with CIDS AMM 33-51-00-710-006.
       1 If the fault no longer exists:
       2 If the fault continues:
  • do a check and repair the wiring between:
    escape slide connector 7531VC pin A and EPSU (11WL) pin T,
    escape slide connector 7531VC pin B and GND,
    LIGHT-FWD EMER, OVERWING [61WL] connector A/B and EPSU (11WL) pin T,
    LIGHT-FWD EMER, OVERWING [61WL] connector A/A and GND,
    LIGHT-FWD EMER, OVERWING [61WL] connector A/C and GND,
    LIGHT-AFT EMER, OVERWING [63WL] connector A/B and EPSU (11WL) pin F,
    LIGHT-AFT EMER, OVERWING [63WL] connector A/A and GND,
    LIGHT-AFT EMER, OVERWING [63WL] connector A/C and GND,
    PROX SW-HANDLE, L AFT EMER EXIT ESC SLIDE [6WN1] pin E and EPSU (11WL) pin S,
    PROX SW-HANDLE, L AFT EMER EXIT ESC SLIDE [6WN1] pin F and GND,
    PROX SW-HANDLE FLAP, L AFT EMER EXIT [21WV1] pin E and EPSU (11WL) pin <K,
    PROX SW-HANDLE FLAP, L AFT EMER EXIT [21WV1] pin F and GND
    ASM 335102 and AWM 335104.
  • install the old ESCAPE SLIDE OFFWING L [7504MM] AMM 25-62-42-400-001.
       3 If the fault continues:
       4 If the fault continues:
     (c) If all lamps of the LIGHT-FWD EMER, OVERWING (61WL) and the LIGHT-AFT EMER, OVERWING (63WL) come on and no correct adapter cable between the escape slide and the aircraft electrical connector is available:
       1 If the fault no longer exists:
       2 If the fault continues:
  • do a check and repair the wiring between:
    escape slide connector 7531VC pin A and EPSU (11WL) pin T,
    escape slide connector 7531VC pin B and GND,
    LIGHT-FWD EMER, OVERWING [61WL] connector A/B and EPSU (11WL) pin T,
    LIGHT-FWD EMER, OVERWING [61WL] connector A/A and GND,
    LIGHT-FWD EMER, OVERWING [61WL] connector A/C and GND,
    LIGHT-AFT EMER, OVERWING [63WL] connector A/B and EPSU (11WL) pin F,
    LIGHT-AFT EMER, OVERWING [63WL] connector A/A and GND,
    LIGHT-AFT EMER, OVERWING [63WL] connector A/C and GND,
    PROX SW-HANDLE, L AFT EMER EXIT ESC SLIDE [6WN1] pin E and EPSU (11WL) pin S,
    PROX SW-HANDLE, L AFT EMER EXIT ESC SLIDE [6WN1] pin F and GND,
    PROX SW-HANDLE FLAP, L AFT EMER EXIT [21WV1] pin E and EPSU (11WL) pin <K,
    PROX SW-HANDLE FLAP, L AFT EMER EXIT [21WV1] pin F and GND
    ASM 335102 and AWM 335104.
  • install the removed ESCAPE SLIDE OFFWING L [7504MM] again AMM 25-62-42-400-001.
       3 If the fault continues:
       4 If the fault continues:
   (3) If the red LED 'EXTERIOR LIGHTS FAULT' and the red LED 'INTERIOR LIGHTS FAULT' flash:
     (a) If the fault continues:
     (b) If the fault continues:
  • do a check for a short to ground an repair the wiring if necessary ASM 335101 and ASM 335104:
    from EPSU (11WL) pin F to the connector(s) of the related signs and lights,
    from EPSU (11WL) pin T to the connector(s) of the related signs and lights,
    from EPSU (11WL) pin S to the connector of the PROXIMITY SWITCH 6WN1 ,
    from EPSU (11WL) pin <K to the connector of the PROXIMITY SWITCH 21WV1 ,
    from EPSU (11WL) pin <Q to the connector(s) of the proximity switches,
  • if you find a short to ground in the wiring, replace the EPSU [11WL] AMM 33-51-38-000-001 and AMM 33-51-38-400-001.
     (c) If the fault continues:
Subtask 33-51-00-810-088-D ** ON A/C NOT FOR ALL
D. If the operational test gives the maintenance message
EPSU EXT LOAD EMER R:
   (1) If the green LED 'SYSTEM OK' comes on:
   (2) If the red LED 'EXTERIOR LIGHTS FAULT' comes on, do the test of the right escape-hatch switches of the emergency-exit escape-slide lighting AMM 33-51-00-720-001.
     (a) If one or more lamps of the LIGHT-FWD EMER, OVERWING (60WL) and the LIGHT-AFT EMER, OVERWING (62WL) do not come on:
       1 If the fault continues:
     (b) If all lamps of the LIGHT-FWD EMER, OVERWING (60WL) and the LIGHT-AFT EMER, OVERWING (62WL) come on and a correct adapter cable between the escape slide and the aircraft electrical connector is available:
  • remove the ESCAPE SLIDE OFFWING R [7505MM] as necessary to get access to the electrical connector AMM 25-62-42-000-001.
  • connect a serviceable escape slide with the adapter cable to the aircraft.
  • do the operational test of the emergency lights not with CIDS AMM 33-51-00-710-006.
       1 If the fault no longer exists:
       2 If the fault continues:
  • do a check and repair the wiring between:
    escape slide connector 7532VC pin A and EPSU (12WL) pin T,
    escape slide connector 7532VC pin B and GND,
    LIGHT-FWD EMER, OVERWING [60WL] connector A/B and EPSU (12WL) pin T,
    LIGHT-FWD EMER, OVERWING [60WL] connector A/A and GND,
    LIGHT-FWD EMER, OVERWING [60WL] connector A/C and GND,
    LIGHT-AFT EMER, OVERWING [62WL] connector A/B and EPSU (12WL) pin F,
    LIGHT-AFT EMER, OVERWING [62WL] connector A/A and GND,
    LIGHT-AFT EMER, OVERWING [62WL] connector A/C and GND,
    PROX SW-HANDLE, R AFT EMER EXIT ESC SLIDE [6WN2] pin E and EPSU (12WL) pin S,
    PROX SW-HANDLE, R AFT EMER EXIT ESC SLIDE [6WN2] pin F and GND,
    PROX SW-HANDLE FLAP, R AFT EMER EXIT [21WV2] pin E and EPSU (12WL) pin <K,
    PROX SW-HANDLE FLAP, R AFT EMER EXIT [21WV2] pin F and GND
    ASM 335102 and AWM 335104.
  • install the old ESCAPE SLIDE OFFWING R [7505MM] AMM 25-62-42-400-001.
       3 If the fault continues:
       4 If the fault continues:
     (c) If all lamps of the LIGHT-FWD EMER, OVERWING (60WL) and the LIGHT-AFT EMER, OVERWING (62WL) come on and no correct adapter cable between the escape slide and the aircraft electrical connector is available:
       1 If the fault no longer exists:
       2 If the fault continues:
  • do a check and repair the wiring between:
    escape slide connector 7532VC pin A and EPSU (12WL) pin T,
    escape slide connector 7532VC pin B and GND,
    LIGHT-FWD EMER, OVERWING [60WL] connector A/B and EPSU (12WL) pin T,
    LIGHT-FWD EMER, OVERWING [60WL] connector A/A and GND,
    LIGHT-FWD EMER, OVERWING [60WL] connector A/C and GND,
    LIGHT-AFT EMER, OVERWING [62WL] connector A/B and EPSU (12WL) pin F,
    LIGHT-AFT EMER, OVERWING [62WL] connector A/A and GND,
    LIGHT-AFT EMER, OVERWING [62WL] connector A/C and GND,
    PROX SW-HANDLE, R AFT EMER EXIT ESC SLIDE [6WN2] pin E and EPSU (12WL) pin S,
    PROX SW-HANDLE, R AFT EMER EXIT ESC SLIDE [6WN2] pin F and GND,
    PROX SW-HANDLE FLAP, R AFT EMER EXIT [21WV2] pin E and EPSU (12WL) pin <K,
    PROX SW-HANDLE FLAP, R AFT EMER EXIT [21WV2] pin F and GND
    ASM 335102 and AWM 335104.
  • install the removed ESCAPE SLIDE OFFWING R [7505MM] again AMM 25-62-42-400-001.
       3 If the fault continues:
       4 If the fault continues:
   (3) If the red LED 'EXTERIOR LIGHTS FAULT' and the red LED 'INTERIOR LIGHTS FAULT' flash:
     (a) If the fault continues:
     (b) If the fault continues:
  • do a check for a short to ground an repair the wiring if necessary ASM 335101 and ASM 335104:
    from EPSU (12WL) pin F to the connector(s) of the related signs and lights,
    from EPSU (12WL) pin T to the connector(s) of the related signs and lights,
    from EPSU (12WL) pin S to the connector of the PROXIMITY SWITCH 6WN2 ,
    from EPSU (12WL) pin <K to the connector of the PROXIMITY SWITCH 21WV2 ,
    from EPSU (12WL) pin <Q to the connector(s) of the proximity switches,
  • if you find a short to ground in the wiring, replace the EPSU [12WL] AMM 33-51-38-000-001 and AMM 33-51-38-400-001.
     (c) If the fault continues:
Subtask 33-51-00-810-086-C ** ON A/C NOT FOR ALL
E. If the operational test gives the maintenance message
EPSU EXT LOAD AFT L:
   (1) If the green LED 'SYSTEM OK' comes on:
   (2) If the red LED 'EXTERIOR LIGHTS FAULT' comes on and a correct adapter cable between the escape slide and the aircraft electrical connector is available:
NOTE: A fault in one of the two aft escape slides can cause the LED to come on.
     (a) Do the subsequent procedures:
  • remove the ESCAPE SLIDE AFT L [7502MM] as necessary to get access to the electrical connector AMM 25-62-44-000-002.
  • connect a serviceable escape slide with the adapter cable to the aircraft.
     (b) If the fault no longer exists:
     (c) If the fault continues:
  • connect the ESCAPE SLIDE AFT L [7502MM] electrically only.
  • remove the ESCAPE SLIDE AFT R [7503MM] as necessary to get access to the electrical connector AMM 25-62-44-000-002.
  • connect a serviceable escape slide with the adapter cable to the aircraft.
     (d) If the fault no longer exists:
     (e) If the fault continues:
  • do a check and repair the wiring between:
    escape slide connector 2872VC pin A and EPSU (13WL) pin F,
    escape slide connector 2872VC pin B and GND,
    PROX SW-HANDLE, R AFT ESC SLIDE [7WN2] pin E and EPSU (13WL) pin S,
    PROX SW-HANDLE, R AFT ESC SLIDE [7WN2] pin F and GND,
    PROX SW-HANDLE, R AFT PAX/CREW DOOR [17WV2] pin E and EPSU (13WL) pin <K,
    PROX SW-HANDLE, R AFT PAX/CREW DOOR [17WV2] pin F and GND
    ASM 335102 and AWM 335104.
     (f) If the fault no longer exists:
     (g) If the fault continues:
  • do a check and repair the wiring between:
    escape slide connector 2873VC pin A and EPSU (13WL) pin T,
    escape slide connector 2873VC pin B and GND,
    PROX SW-HANDLE, L AFT ESC SLIDE [7WN1] pin E and EPSU (13WL) pin C,
    PROX SW-HANDLE, L AFT ESC SLIDE [7WN1] pin F and GND,
    PROX SW-HANDLE, L AFT PAX/CREW DOOR [17WV1] pin E and EPSU (13WL) pin D,
    PROX SW-HANDLE, L AFT PAX/CREW DOOR [17WV1] pin F and GND
    ASM 335102 and AWM 335104.
  • install the old ESCAPE SLIDE AFT L [7502MM] AMM 25-62-44-400-006.
  • install the old ESCAPE SLIDE AFT R [7503MM] AMM 25-62-44-400-006.
     (h) If the fault continues:
     (i) If the fault continues:
     (j) If the fault continues:
     (k) If the fault continues:
   (3) If the red LED 'EXTERIOR LIGHTS FAULT' comes on and no correct adapter cable between the escape slide and the aircraft electrical connector is available:
NOTE: A fault in one of the two aft escape slides can cause the LED to come on.
     (a) Do the subsequent procedures:
     (b) If the fault no longer exists:
     (c) If the fault continues:
  • connect the removed ESCAPE SLIDE AFT L [7502MM] electrically only.
  • remove the ESCAPE SLIDE AFT R [7503MM] AMM 25-62-44-000-002.
  • connect a serviceable escape slide electrically only.
     (d) If the fault no longer exists:
     (e) If the fault continues:
  • do a check and repair the wiring between:
    escape slide connector 2872VC pin A and EPSU (13WL) pin F,
    escape slide connector 2872VC pin B and GND,
    PROX SW-HANDLE, R AFT ESC SLIDE [7WN2] pin E and EPSU (13WL) pin S,
    PROX SW-HANDLE, R AFT ESC SLIDE [7WN2] pin F and GND,
    PROX SW-HANDLE, R AFT PAX/CREW DOOR [17WV2] pin E and EPSU (13WL) pin <K,
    PROX SW-HANDLE, R AFT PAX/CREW DOOR [17WV2] pin F and GND
    ASM 335102 and AWM 335104.
     (f) If the fault no longer exists:
     (g) If the fault continues:
  • do a check and repair the wiring between:
    escape slide connector 2873VC pin A and EPSU (13WL) pin T,
    escape slide connector 2873VC pin B and GND,
    PROX SW-HANDLE, L AFT ESC SLIDE [7WN1] pin E and EPSU (13WL) pin C,
    PROX SW-HANDLE, L AFT ESC SLIDE [7WN1] pin F and GND,
    PROX SW-HANDLE, L AFT PAX/CREW DOOR [17WV1] pin E and EPSU (13WL) pin D,
    PROX SW-HANDLE, L AFT PAX/CREW DOOR [17WV1] pin F and GND
    ASM 335102 and AWM 335104.
  • install the old ESCAPE SLIDE AFT L [7502MM] AMM 25-62-44-400-006.
  • install the removed ESCAPE SLIDE AFT R [7503MM] again AMM 25-62-44-400-006.
     (h) If the fault continues:
     (i) If the fault continues:
     (j) If the fault continues:
     (k) If the fault continues:
   (4) If the red LED 'EXTERIOR LIGHTS FAULT' and the red LED 'INTERIOR LIGHTS FAULT' flash:
     (a) If the fault continues:
     (b) If the fault continues:
  • do a check for a short to ground an repair the wiring if necessary ASM 335101 and ASM 335104:
    from EPSU (13WL) pin F to the connector(s) of the related signs and lights,
    from EPSU (13WL) pin T to the connector(s) of the related signs and lights,
    from EPSU (13WL) pin C to the connector of the PROXIMITY SWITCH 7WN1 ,
    from EPSU (13WL) pin D to the connector of the PROXIMITY SWITCH 17WV1 ,
    from EPSU (13WL) pin S to the connector of the PROXIMITY SWITCH 7WN2 ,
    from EPSU (13WL) pin <K to the connector of the PROXIMITY SWITCH 17WV2 ,
    from EPSU (13WL) pin <Q to the connector(s) of the proximity switches,
  • if you find a short to ground in the wiring, replace the EPSU [13WL] AMM 33-51-38-000-001 and AMM 33-51-38-400-001.
     (c) If the fault continues:
Subtask 33-51-00-710-065-A ** ON A/C NOT FOR ALL
F. Do the test as given in Para. 3.A.
5. Close-up
Subtask 33-51-00-860-071-A ** ON A/C NOT FOR ALL
A. Put the aircraft back to its initial configuration.
[Rev.8 from Aug 2018] 2026.04.04 04:40:22 UTC
"AVIABRAIN" 2025