Procedure for an Emergency Shutdown (New or Overhauled Engines) [IAE]

TASK 71-00-00-710-021-A
Procedure for an Emergency Shutdown (New or Overhauled Engines)

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
TASK 71-00-00-710-043-A	Normal Engine Automatic-Start Procedure
TASK 71-00-00-710-047-A	Normal Engine Manual-Start Procedure
Gearbox Crank Pad Locations

3. Job Set-up
Subtask 71-00-00-869-161-A ** ON A/C NOT FOR ALL

A. Not Applicable

4. Procedure
Subtask 71-00-00-710-095-A ** ON A/C NOT FOR ALL

A. Procedure for an emergency shut down for engines with less than two hours of operation time since overhaul of HP rotor blade tip seals.

CAUTION: IF YOU DO NOT DO THIS PROCEDURE, DAMAGE TO THE HP ROTOR BLADE TIP SEALS CAN BE THE RESULT.

CAUTION: DO NOT TRY TO START AN ENGINE THAT HAS AN N2 ROTOR THAT IS LOCKED. THE HP ROTOR BLADE TIP SEALS CAN BE DAMAGED.

CAUTION: DO NOT START NEWLY OVERHAULED ENGINES WITH HP COMPRESSOR BLADE TIP CLEARANCES THAT ARE NOT WORN AFTER AN EMERGENCY SHUTDOWN. THIS CAN CAUSE AN ECCENTRIC RUB PATTERN OF THE HP COMPRESSOR BLADE TIP SEALS. THIS IS CAUSED BY A THERMALLY BOWED ROTOR BECAUSE OF HEAT BUILD-UP IN THE 15 MINUTES THAT FOLLOW AN EMERGENCY SHUTDOWN. THIS ECCENTRIC RUB PATTERN CAN CAUSE UNSATISFACTORY ENGINE PERFORMANCE AND STABILITY.

(1) Quickly and immediately move the throttle control lever to the minimum idle position.
(2) On the ENG panel 115VU: Set the ENG/MASTER control switch 1(2) to OFF. The HP fuel shut off valve will close and stop the flow of fuel to the engine.

NOTE: The EEC will engage the starter automatically when N2 reaches 10 percent and will continue to motor the engine until the EGT has decreased below 250 deg.C (482.00 deg.F) or for two minutes, whichever is reached first.

(3) Start the engine again in less than 15 minutes by the instructions given in Normal Engine Automatic Start Procedure (Ref. AMM TASK 71-00-00-710-043) or Normal Engine Manual Start Procedure (Ref. AMM TASK 71-00-00-710-047)
(4) Keep the power at minimum idle for 15 minutes before you move the throttle control lever forward. Normal operation can continue after 15 minutes at minimum idle.
(5) If you cannot start the engine again in less than 15 minutes, do not try to start the engine for six hours, but you can turn the HP compressor as follows :
(a) Turn the HP compressor (use the gearbox crank pad) 180 degrees each half hour until the start can be made. One third turn clockwise (as seen from the front of the gearbox) on the gearbox crank pad is equal to 180 degrees N2.

Gearbox Crank Pad Locations ** ON A/C NOT FOR ALL

NOTE: Between 10 and 20 minutes after the last manual rotor turn, before you try an engine start, the HP rotor must be free to turn (less than 500 lbf.in (5.65 m.daN) of torque at the gearbox crank pad) through 360 degrees. Operate the engine at APPROACH IDLE for 15 minutes before you accelerate.

(b) If the rotor cannot be turned (if more than 500 lbf.in (5.65 m.daN)) of torque is necessary), try to turn the rotor each one half hour until the rotor is free.
(c) When the rotor is free, turn the rotor 180 degrees, stop for one hour and start the engine. Operate the engine at APPROACH IDLE for 15 minutes before you accelerate.

[Rev.10 from 2021] 2026.04.01 02:28:09 UTC