Procedure for an Emergency Shutdown [IAE]

TASK 71-00-00-710-015-A
Procedure for an Emergency Shutdown

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

REFERENCE	DESIGNATION
TASK 71-00-00-700-016-A	Procedure for a Bowed Rotor Start Prevention
TASK 71-00-00-710-045-A	Test No.1 : Dry Motor Leak Check

3. Job Set-up
Subtask 71-00-00-869-153-A ** ON A/C NOT FOR ALL

A. Not Applicable

4. Procedure
Subtask 71-00-00-710-093-A ** ON A/C NOT FOR ALL

A. Procedure for an emergency shutdown

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 MIN IDLE position.
(2) On the ENG panel 115VU:
Set the ENG/MASTER control switch 1(2) to OFF. The HP fuel valve will close immediately.
(3) Do a dry motoring.

CAUTION: YOU CAN ENGAGE STARTER MOTOR WHEN N2 IS LESS THAN 10 PER CENT. IF YOU ENGAGE STARTER MOTOR AT MORE THAN 10 PERCENT N2 SPEED CAN CAUSE DAMAGE TO THE STARTER.

(a) Do a dry motoring of the engine for a minimum of 30 seconds but not more than two minutes to remove the remaining fuel and to decrease the EGT below 250 deg.C (482 deg.F) (Ref. AMM TASK 71-00-00-710-045).
(4) Examine the ignition system leads.

CAUTION: WHEN ENGINE SHUTDOWN OCCURS QUICKLY, THE IGNITION LEAD CAN POSSIBLY NOT BE SUFFICIENTLY COOL. DAMAGE TO THE RUBBER BUSHINGS AND INSULATION CAN BE THE RESULT.

(a) Examine the ignition system leads at the terminal end (which is connected to the igniter) for signs of damage before the subsequent start. The cause of the damage is high temperature.
(5) Before you start the engine refer to the procedure for a bowed rotor start prevention after an emergency shutdown (Ref. AMM TASK 71-00-00-700-016).

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