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1. Provide electrical power.
2. Place affected zone selectors to OFF. Place DO-NOT-OPERATE identifier on selectors.
3. Place both affected pack selectors to OFF. Place DO-NOT-OPERATE identifier on both selectors.
4. Open and collar the applicable ZONE TEMP CONT VLV CL circuit breaker for affected valve on overhead circuit breaker panel (P11).
5. Open No. 1 cargo door and remove bulkhead lining panel at aft end of forward cargo compartment and locate trim air modulating valve to be closed.
6. Check valve position, if not closed rotate the manual override knob counter clockwise until the position indicator on valve shows valve closed.
7. Disconnect, cap and stow electrical connector from valve.
8. Remove DO-NOT-OPERATE identifiers from both pack control selectors and affected zone control selectors.
 
BONDING POSITION
TRIM AIR MODULATING VALVE
 
 
B757 - 200 MINIMUM EQUIPMENT LIST

 
NUMBER INSTALLED

  NUMBER REQUIRED FOR DISPATCH
1 0 REMARKS OR EXCEPTIONS

 
EICAS STATUS MESSAGES
None
PLACARD
Trim air OFF light - INOP
 
  B757 - 200 MINIMUM EQUIPMENT LIST
EICAS STATUS MESSAGES
None
PLACARD
Associated zone INOP light - INOP
Associated zone temperature control selector - DO NOT OPERATE - LEAVE OFF Trim air switchlight as appropriate
MAINTENANCE (M)
Affected Zone Trim Air Modulating Valve Closed:
1. Position affected Compartment Temperature Control as follows:
A. FLT DK, FWD CAB or AFT CAB, rotate temperature control to OFF.
2. Check on EICAS ECS/MSG page that the affected 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 Zone Trim Air Modulating Valve will not stay closed using the
above procedure, use the optional procedure in Item 21-61-1 to ensure 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 (or affected compartment) 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 switch as appropriate - L (or R) TRIM AIR INOP MAINTENANCE (M)
1. An inoperative trim air check valve is secured closed by installing a blanking plate on the downstream side of the inoperative trim air check valve. The blanking plate may be installed on either the left side or right side, depending on which valve is inoperative (or on either side of both are inoperative).
　
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本文鏈接地址：757 最低設備清單 Minimum Equipment List (MEL) 1(51)