757 最低设备清单 Minimum Equipment List (MEL) 1(47)

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2. If Maintenance has installed a shorting plug in ram air inlet door electrical connector, then operate affected pack in STBY mode (AUTO mode will be inoperative).
Doors In Any Other Position (Affected Pack Deactivated):
1. See Item 21-51-1 for operations information when dispatching with one pack inoperative.
 
  B757 - 200 MINIMUM EQUIPMENT LIST
A. Verify that the ram air exhaust door is in the full open position.
B. Disconnect, cap and stow electrical connector for exhaust door actuator.
4. If exhaust door is inoperative - not full open:
A. Remove exhaust door actuator (AMM 21-53-04).
B. Fabricate actuator link 11.1 inch long with rod ends compatible with door actuator fittings.
C. Position door to full open position and install actuator link in place of ram air actuator.
5. Notify dispatch that (left or right) pack is inoperative and flight will be limited to FL 350 or below. Ram Air
RAM AIR INLET DOOR OPEN POSITION
RAM AIR EXHAUST DOOR OPEN POSITION
RAM AIR INLET/EXHAUST DOOR INSTALLATION
 
  B757 - 200 MINIMUM EQUIPMENT LIST

EICAS STATUS MESSAGES
AFT EXHAUST FAN
PLACARD
As appropriate
 
 
B757 - 200 MINIMUM EQUIPMENT LIST
 

 
EICAS STATUS MESSAGES
OVBD EX VAL OPEN OVBD EX VAL TEST
PLACARD
Equipment cooling control panel as appropriate - OVBD EX VAL INOP - SMOKE POS or OPEN MAINTENANCE (M)
1. Confirm the valve’s position (partially open, fixed open or missing) using the following procedure: A. Provide electrical power.
 
B. Place Left Recirculating Fan switch off.
C. Place equipment cooling switch to the ALTN position.
D. To access valve, open forward cargo compartment left sidewall panel located four feet aft of forward bulkhead. For partially open position, ensure valve actuator position indicator is in the SMOKE position. (Should the valve move toward the closed position the valve actuator will not allow it to close completely thus insuring smoke clearance capability for the forward equipment cooling system.)
E. Disconnect and stow the electrical connector from the Forward Equipment Cooling Overboard Exhaust Valve.
F. De-select the ALTN equipment cooling mode.
G. Close sidewall panel.
H. Press L RECIRC FAN switch to ON.
2. For unpressurized flight, use Item 21-31-1 Maintenance (M) procedure.
FORWARD EQUIPMENT COOLING OVERBOARD EXHAUST VALVE
OPERATIONS (O)
1. If valve is in open position:
A. Flight will be unpressurized, use Item 21-31-1 Operations (O) procedure.
2. If valve is in SMOKE (partially open) position:
 
A. Limit operating altitude to FL 350 or lower.
3. When dispatching with empty Cargo Compartment the associated Compartment must remain empty or contain only ballast, empty cargo handling equipment (ballast may be loaded in ULDs(Unit Load Device)), or Flight Kits. The content of a Flight Kit is defined in B757 Technical File. Materials to be used as ballast shall be non-combustible (see MEL Preamble).
　
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