TASK 21-31-00-810-808

 Safety Valves open
 1. Possible Causes
_______________
 - VALVE-SAFETY 1 (6HL)

 - VALVE-SAFETY 2 (7HL)

 - VALVE-OUTFLOW (10HL)

 - wiring

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION
 -------------------------------------------------------------------------------
AMM 21-31-51-000-001 Removal of the Outflow Valve 10HL (From Inside)
 AMM 21-31-51-000-006 Removal of the Outflow Valve 10HL (From Outside)
 AMM 21-31-51-400-001 Installation of the Outflow Valve 10HL (From Inside)
 AMM 21-31-51-400-006 Installation of the Outflow Valve 10HL (From Outside)
 AMM 21-31-52-000-001 Removal of the Safety Valve 6HL (7HL)
 AMM 31-50-00-710-001 Ground Scanning of the Central Warning System
 AMM 31-60-00-860-001 EIS Start Procedure
 ASM 21-31/02
 ASM 21-31/02
 ASM 21-31/02

 3. Fault Confirmation
__________________
 A. Do a check of the safety-valve symbol position on the ECAM CAB PRESS page (Ref. AMM TASK 31-60-00-860-001).
 4. Fault Isolation
_______________
 A. If:
R (1) the safety-valves have opened during flight below delta p = 8.4 psi:
 - replace the VALVE-SAFETY 1 (6HL) and the VALVE-SAFETY 2 (7HL) (Ref. AMM TASK 21-31-52-000-001) and (Ref. AMM TASK 21-31-52-000-001).

 - add fault history on the replaced units.

 (2) the safety valves have opened during flight at apprx. 8.6 psi. and the outflow valve was indicated closed at that time, (associated failure message would be OUTFLOW VALVE with code (81) in LLR, however this message is not necessarily generated):
 - replace the VALVE-OUTFLOW (10HL) (Ref. AMM TASK 21-31-51-000-001) and (Ref. AMM TASK 21-31-51-400-001) or (Ref. AMM TASK 21-31-51-000-006) and (Ref. AMM TASK 21-31-51-400-006).

 - add fault history on the replaced unit.

 「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1 EFF : ALL ∞∞21-31-00∞∞∞∞∞∞∞∞∞∞Page 218
 Feb 01/05 CES B. If the safety-valve symbol is closed:

 - no other maintenance action is necessary.
 C. If the safety-valve symbol is open:
 - do a check for a ground signal at the SAFETY VALVE 1 (6HL) A/2 (Ref. ASM 21-31/02).
 (1) If there is no ground signal:

 - replace the VALVE-SAFETY 1 (6HL) (Ref. AMM TASK 21-31-52-000-001) and (Ref. AMM TASK 21-31-52-000-001).
 (a) If the fault continues:
 - do a check and repair the wiring from the VALVE 1 (6HL) A/1 to the GND (Ref. ASM 21-31/02).

 (2) If there is a ground signal:

 - do a check for a ground signal at the SAFETY VALVE 2 (7HL) A/2 (Ref. ASM 21-31/02).
 (a) If there is no ground signal:

 - replace the VALVE-SAFETY 2 (7HL) (Ref. AMM TASK 21-31-52-000-001) and (Ref. AMM TASK 21-31-52-000-001).

 (b) If the fault continues:

 - do a check and repair the wiring from the VALVE 2 (7HL) A/1 to the GND (Ref. ASM 21-31/02).

 (3) If the fault continues:

 - do the operational test of the central warning system (Ref. AMM TASK 31-50-00-710-001).
R (a) If the test gives a different maintenance message, refer to the R Fault Symptom List.
 (4) If the fault continues:
 - do a check and repair the wiring between: VALVE 1 (6HL) A/2 and SDAC 1 (1WV1) AA/9A, SDAC 1 (1WV1) AA/9A and SDAC 2 (1WV2) AA/9A, VALVE 2 (7HL) A/2 and SDAC 2 (1WV2) AD/9G, SDAC 2 (1WV2) AD/9G and SDAC 1 (1WV1) AD/9G (Ref. ASM 21-31/02).
 D. Do the test as given in the Para. 3.A.
 5. Close-up
________
 A. Put the aircraft back to its initial configuration.
 「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1 EFF : ALL ∞∞21-31-00∞∞∞∞∞∞∞∞∞∞Page 219
 Feb 01/05 CES TASK 21-31-00-810-809

 Excessive Cabin Altitude
 1. Possible Causes
_______________
 - CONTROLLER-CABIN PRESSURE 1 (11HL)

 - CONTROLLER-CABIN PRESSURE 2 (12HL)

 - VALVE-OUTFLOW (10HL)

 - LGCIU-1 (5GA1)

 - LGCIU-2 (5GA2)

 - air conditioning pack ducts

 - trim air ducts

 - isolation valves

 - bleed air system

 - skin air valves

 - structural damage (Ref. SIL 21-040)
　
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