EGT at or above the HPC Operating Line Limit on Engine 1

TASK 72-00-00-810-808-A
EGT at or above the HPC Operating Line Limit on Engine 1

1. Possible Causes

engine

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
TSM TASK 77-00-00-810-849-A	EGT Overlimit on Engine 1 or 2
TSM TASK 77-00-00-810-854-A	Loss of the EGT Indication on Engine 1 or 2
TSM TASK 77-20-00-810-830-A	The EGT indication fluctuates while other parameters are stable on Engine 1
AMM 71-00-00-000-042	Removal of the Power Plant
AMM 71-00-00-400-042	Installation of the Power Plant
AMM 72-00-00-200-006	Inspection/Check of Foreign Object Damage (FOD) (Bird Strike Included)
AMM 75-31-00-210-002	Visual Inspection of the Variable Bleed Valve (VBV) System

3. Fault Confirmation
Subtask 72-00-00-710-064-A ** ON A/C NOT FOR ALL

A. Get the engine take off EGT data, with the use of the MCDU or DAR/QAR data. Check for previous history logged on this engine of CFDS message "HPC (OPERT.LINE)".

4. Fault Isolation
Subtask 72-00-00-810-059-A ** ON A/C NOT FOR ALL

A. Do this trouble shooting if the SB CFMI 72-182 has not been incorporated. If POST SB CFMI 72-182, fault message must be ignored.
(1) Check for the presence of the following CFDS messages in the Post Flight Report (PFR) and do trouble shooting as required.

VBV ACT, HMU
T495 SNSR, J13, ECU
CHECK HOT AIR LEAKS ENG1
HPTCC VLV (POS), HMU
BSV, HMU

(2) Do a visual inspection of all the VBV doors actuators and flexible shafts through the fan duct panels. Check for offset of position between all VBV doors AMM 75-31-00-210-002.
(3) If an EGT fluctuation/loss has been reported by the crew, do trouble shooting for the EGT indication (Ref. TSM TASK 77-00-00-810-854) and (Ref. TSM TASK 77-20-00-810-830).
(4) Check if the Engine Serial Number (ESN) of the engine was entered through the LRU IDENTIFICATION menu of the MCDU before the flight.

if yes, no further action is required.

(5) Do an inspection of the engine for Foreign Object Damage (FOD or bird strike) AMM 72-00-00-200-006.
(6) Check if an EGT deterioration greater than 62 deg. C (using EGT value recorded in the take off report) is consistant with the EGT trend monitoring data (GEM or ADEPT):

if no, do trouble shooting of the EGT system (Ref. TSM TASK 77-00-00-810-849)
if yes, the engine must be replaced within five (5) cycles AMM 71-00-00-000-042 and AMM 71-00-00-400-042.

[Rev.8 from Aug 2018] 2026.04.04 04:35:09 UTC