W DOC AIRBUS | TSM A320F

Emergency Ram Air Inlet Fault

TASK 21-55-00-810-801-A
Emergency Ram Air Inlet Fault

1. Possible Causes
  • EMERG RAM AIR ACTUATOR [7HZ]
  • P/BSW-AIR COND/RAM RAM AIR [4HZ]
  • wiring
  • RELAY-RAM AIR OPENING CTL [5HZ]
  • RELAY-RAM AIR CLOSE CTL [3HZ]
2. Job Set-up Information
 A. Referenced Information
REFERENCE
DESIGNATION
AMM 21-55-00-710-001
Operational Test of the Emergency Ram-Air Inlet
ASM 215501
AMM 21-55-51-000-001
Removal of the Emergency Ram Air Inlet Actuator
AMM 21-55-51-400-001
Installation of the Emergency Ram Air Inlet Actuator
AWM 315452
3. Fault Confirmation
Subtask 21-55-00-710-050-A
A. Do the operational test of the emergency ram air inlet AMM 21-55-00-710-001.
4. Fault Isolation
Subtask 21-55-00-810-050-A
A. If during the test on the lower ECAM display the ram air symbol is replaced by amber XX:
  • do a check for 28VDC at the EMERG RAM AIR ACTUATOR [7HZ] .
   (1) If the voltage is correct:
     (a) If the fault continues:
  • replace the P/BSW-AIR COND/RAM RAM AIR [4HZ] .
     (b) If the fault continues:
  • do a check and repair the wiring from:
    . the EMERG RAM AIR ACTUATOR [7HZ] A/B, F to the SDAC-1 (1WV1) AA/9F, 10F,
    . the EMERG RAM AIR ACTUATOR [7HZ] A/B, F to the SDAC-2 (1WV2) AA/9F, 10F,
    . the EMERG RAM AIR ACTUATOR [7HZ] A/D, H to the GND,
    . the RAM AIR pushbutton switch (4HZ) A/J to the SDAC-1 (1VW1) AA/9G,
    . the RAM AIR pushbutton switch (4HZ) A/J to the SDAC-2 (1WV2) AA/9G,
    . the RAM AIR pushbutton switch (4HZ) A/D3 to the GND,
ASM 215501 and AWM 315452.
   (2) If the voltage is not correct:
  • replace the P/BSW-AIR COND/RAM RAM AIR [4HZ] .
     (a) If the fault continues:
  • replace the RELAY-RAM AIR OPENING CTL [5HZ] .
     (b) If the fault continues:
  • replace the RELAY-RAM AIR CLOSE CTL [3HZ] .
     (c) If the fault continues:
  • do a check and repair the wiring from the EMERG RAM AIR ACTUATOR [7HZ] to the circuit breaker (1HZ), via the relay (5HZ), the RAM AIR pushbutton switch (4HZ) and the relay (3HZ) ASM 215501.
Subtask 21-55-00-710-051-A
B. Do the test given in Para. 3.
[Rev.8 from Aug 2018] 2026.04.04 04:38:52 UTC
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