757 最低设备清单 Minimum Equipment List (MEL) 2(81)

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2. Check valve position indicators to verify valve position (see illustration).
 The airplane may be dispatched if the high pressure compressor and high pressure turbine case cooling air valve is in the closed position.
 The airplane may be dispatched with the low pressure turbine case cooling air valve in the open position only.
NOTE: At this time, there exists no recommended procedure for dispatch with the LP turbine case cooling air valve inoperative closed.
 If the LP turbine case cooling air valve fails in the closed or partially closed position, dispatch is not allowed in that configuration.
 If the LP turbine case cooling air valve fails in the open position, Pratt and Whitney recommends the valve be replaced when practical to reduce the loss of performance due to seal rubbing.
3. Disconnect, cap and stow electrical connector of affected valve.
 
4. Close fan duct cowl and thrust reverser left half (AMM 78-31-00/201).
 
HIGH PRESSURE
COMPRESSOR AND
HIGH PRESSURE TURBINE CASE COOLING AIR VALVE
LOW PRESSURE TURBINE CASE COOLING AIR VALVE
VALVE POSITION INDICATOR (BOTTOM OF VALVE)
 
HIGH PRESSURE COMPRESSOR AND HIGH PRESSURE TURBINE CASE COOLING VALVE
VALVE
POSITION INDICATOR
SUPPLY MANIFOLD (REF)
 
LOW PRESSURE TURBINE CASE COOLING AIR VALVE
 

 
HP AND LP TURBINE CASE COOLING AIR VALVE INSTALLATION
 

NUMBER INSTALLED
2 NUMBER REQUIRED FOR DISPATCH
REMARKS OR EXCEPTIONS
0 (M) May be inoperative provided associated turbine cooling valves are deactivated open.
 
EICAS STATUS MESSAGES
L ENG TURB COOL
R ENG TURB COOL
PLACARD
As appropriate
MAINTENANCE (M)
 When EICAS status message L or R ENG TURB COOL is displayed, review the EPCS maintenance page. A lenticular air seal overheat event is indicated if the L or R ENG TURB COOL status message and P(S) 354-20 EPCS maintenance message are both displayed. Follow maintenance procedures required for the P(S) 354-20 EPCS maintenance message, if it is displayed.
 To secure the associated valves open:
A. Open the fan duct cowl and thrust reverser right half (AMM 78-31-00/201).
B. Deactivate the turbine cooling air system by
 Removing bolt and nut from the threaded rod end and the actuator shaft clevis, and
 Moving the threaded rod end down to attach the connecting rod to the hole provided in the upper shelf of the bracket assembly, using the bolt and nut removed in step 2.B.1). Torque the nut to 36 to 40 in. lb.
C. Close the fan duct cowl and thrust reverser right half (AMM 78-31-00/201).
D. Erase the EICAS status message.
NOTE: Status message L(R) ENG TURB COOL may be ignored after de-activation provided EPCS Maintenance message 354-20 does not appear. For all other EPCS messages, dispatch is allowed with L(R) ENG TURB COOL Status message displayed.
　
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