Critical Overtemperature Fault

TASK 21-58-00-810-815-A
Critical Overtemperature Fault

1. Possible Causes

SENSOR-TEMP DUCT,CSAS [115HW]
SENSOR-BLEED AIR TEMP, IGGS [2YA]

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 21-58-00-100-001	Remove CSAS Heat Exchanger for Cleaning
AMM 21-58-00-710-002	Operational Test of the Conditioned Service Air System with Bleed Air
AMM 21-58-11-000-001	Removal of the Duct Temperature Sensor
AMM 21-58-11-400-001	Installation of the Duct Temperature Sensor
AMM 47-41-11-000-001	Removal of the Temperature Sensor
AMM 47-41-11-400-001	Installation of the Temperature Sensor

3. Fault Confirmation
Subtask 21-58-00-710-078-B ** ON A/C NOT FOR ALL

A. Test.
(1) Do the reset procedure for the CSAS and the IGGS as follows,

open the circuit breakers 1HW and 7YA.
wait for a minimum of 5 seconds.
close the circuit breakers 1HW and 7YA.

(2) Do the operational test of the conditioned service air system with bleed air AMM 21-58-00-710-002.
(3) Do a read out of the post flight report.

4. Fault Isolation
Subtask 21-58-00-810-075-A ** ON A/C NOT FOR ALL

A. If the test gives a different maintenance message, do the related trouble shooting procedure.

Subtask 21-58-00-810-064-A ** ON A/C NOT FOR ALL

B. If the test gives the maintenance message CRITICAL OVTEMP:

do a check for leakages downstream of the CSAS Heat Exchanger (5103HM) during the test.
remove the leakage by replacement of the faulty component if necessary.

(1) If the fault continues:

do a check of the CSAS Heat Exchanger and the Ram Air Channel for contamination.

(a) If the Heat Exchanger is contaminated:
1 clean the Heat Exchanger (5103HM) AMM 21-58-00-100-001.

Subtask 21-58-00-810-101-A ** ON A/C NOT FOR ALL

C. If no leakage and no contamination is found and the post flight report gives the maintenance message CRITICAL OVTEMP:

do a read out of the TROUBLE SHOOTING DATA (TSD) of the fault message:

(1) push the line key adjacent to the prompt ">" at the right of the Class number of the fault:
(a) if the trouble shooting data gives the fault code 1041 1101 or 1041 1102: refer to paragraph D.
(b) if the trouble shooting data gives the fault code 1041 1103 or 1041 1104 or 1041 1105: refer to paragraph E.

Subtask 21-58-00-810-102-A ** ON A/C NOT FOR ALL

D. If the trouble shooting data gives the fault code 1041 1101 or 1041 1102:

replace the SENSOR-TEMP DUCT,CSAS [115HW] AMM 21-58-11-000-001 and AMM 21-58-11-400-001.

Subtask 21-58-00-810-103-A ** ON A/C NOT FOR ALL

E. If the trouble shooting data gives the fault code 1041 1103 or 1041 1104 or 1041 1105:

replace the SENSOR-BLEED AIR TEMP, IGGS [2YA] AMM 47-41-11-000-001 and AMM 47-41-11-400-001.

Subtask 21-58-00-710-079-A ** ON A/C NOT FOR ALL

F. Do the test as given in the Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:24:50 UTC