757 最低设备清单 Minimum Equipment List (MEL) 1(50)

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OPERATIONS NOTE
If affected compartment temperature becomes too hot or too cold, select trim air OFF to achieve 24°C
control.
 
REPAIR INTERVAL C 1 NUMBER INSTALLED
ITEM   0 NUMBER REQUIRED FOR DISPATCH
    REMARKS OR EXCEPTIONS
(M) May be inoperative provided associated zone trim air modulating valve, or trim air regulating/shutoff valve remains closed.
21-61-2 Flight Deck COMPT TEMP
Control System    

EICAS STATUS MESSAGES
None
PLACARD
Flight deck temperature control selector - FLT DK TEMP CONTROL SYS INOP Trim air switchlight as appropriate
MAINTENANCE (M)
Flight Deck Zone Trim Air Modulating Valve Closed:
1. Position FLT DK Compartment Temperature Control to OFF.
2. Check on EICAS ECS/MSG page that the FLT DK TRIM VALVE is in the full closed (0.00) position.
3. Check that the affected Zone INOP Light illuminates.
NOTE: If there is reason to suspect that the FLT DK Zone Trim Air Modulating Valve will not stay closed
using the above procedure, use the optional procedure in Item 21-61-1 to insure its closure. Trim Air Regulating Valve Closed:
1. Press TRIM AIR switchlight on P5 panel to OFF.
2. Check that amber TRIM AIR OFF light comes on.
3. Open and collar the CABIN TRIM AIR circuit breaker on overhead circuit breaker panel (P11).
OPERATIONS NOTE
If flight deck temperature becomes too hot or too cold, select trim air OFF to achieve 24°C control.
 
  B757 - 200 MINIMUM EQUIPMENT LIST

EICAS STATUS MESSAGES
None
PLACARD
Trim air switchlight - TRIM AIR INOP
MAINTENANCE (M)
1. Press TRIM AIR switchlight on P5 panel to off position.
2. Open left ECS door (193CL or 194CL).
3. Rotate manual override on Trim Air Pressure Regulating Valve until position indicator is in CLOSE.
4. Disconnect, cap and stow electrical connector from regulating valve.
5. Close left ECS door.
 
REPAIR INTERVAL   NUMBER INSTALLED
ITEM    NUMBER REQUIRED FOR DISPATCH
    REMARKS OR EXCEPTIONS
21-61-4 Zone Trim Air Modulating C 3 0 (M) May be inoperative closed.
Valves    
 C 3 0 May be inoperative in any position provided trim air switch remains OFF.

EICAS STATUS MESSAGES
None
PLACARD
Associated zone temperature selector as appropriate - FLT DK (FWD CAB or AFT CAB) TRIM AIR INOP Trim air switchlight as appropriate
MAINTENANCE (M)
Close individual zone trim air modulating valve(s) per the following steps:
NOTE: Three trim air modulating valves are located on the 3 trim air supply ducts just forward of the air conditioning packs (see following illustration).
　
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