High Idle Speed on both Engines

TASK 71-00-00-810-805-A
High Idle Speed on both Engines

1. Possible Causes

ZONE CONTROLLER [8HK]
P/BSW-ANTI ICE/WING [3DL]
CONT-AIR COND SYSTEM 1 [47HH]
CONT-AIR COND SYSTEM 2 [57HH]

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
TSM TASK 36-11-00-810-809-A	Bleed Pressure-Regulator Valve of the Engine 1 Blocked in the Closed Position or Regulation Too Low
TSM TASK 36-11-00-810-810-A	Bleed Pressure-Regulator Valve of the Engine 2 Blocked in the Closed Position or Regulation Too Low
TSM TASK 36-11-00-810-829-A	Loss of the Non-Return Function and Temperature Limitation Function of the Bleed Pressure-Regulator Valve of the Engine 1
TSM TASK 36-11-00-810-830-A	Loss of the Non-Return Function and Temperature Limitation Function of the Bleed Pressure-Regulator Valve of the Engine 2
AMM 21-61-34-000-002	Removal of the Air-Conditioning System Controller
AMM 21-61-34-400-002	Installation of the Air-Conditioning System Controller
AMM 21-63-34-000-001	Removal of the Zone Controller
AMM 21-63-34-400-001	Installation of the Zone Controller
AWM 301101
AMM 71-00-00-710-003	Engine Automatic Start
ASM 732506

3. Fault Confirmation
Subtask 71-00-00-710-056-A ** ON A/C NOT FOR ALL

A. Test
(1) Not applicable.

4. Fault Isolation
Subtask 71-00-00-810-055-A ** ON A/C NOT FOR ALL

A. If the fault symptom is identified by a high idle speed on both engines:

Do a check of the Post Flight Report (PFR) and the scheduled maintenance report for ECAM status EIU and/or for failure messages relative to the bleed system, and do the associated troubleshooting.

(1) If the A/C is under MMEL 36-11-02 (Pressure Regulating Valve (PRV) secured closed), troubleshoot per (Ref. TSM TASK 36-11-00-810-809) or (Ref. TSM TASK 36-11-00-810-810).
(a) If nothing is found:

Replace the ZONE CONTROLLER [8HK] AMM 21-63-34-000-001 and AMM 21-63-34-400-001.

(2) If the fault continues:

Do a check of the aircraft wiring between the CONT-ZONE TEMPERATURE (8HK) and both EIUs ASM 732506:

(a) 8HK pins AA/1J, 2J to the first terminal block
(b) 8HK pins AA/1B, 2B to the first terminal block.
(3) If nothing is found or if the fault continues:

With the ANTI ICE/WING pushbutton switch (3DL) released, make sure that there is ground at pin AA/C2 of this pushbutton switch.

(a) If there is no ground:

Replace the P/BSW-ANTI ICE/WING [3DL] AWM 301101.

(b) If there is ground or if the fault continues:

Troubleshoot as per (Ref. TSM TASK 36-11-00-810-829) and (Ref. TSM TASK 36-11-00-810-830) to check 10HA1, 10HA2 and 4001HA1, 4001HA2.

Subtask 71-00-00-810-055-B ** ON A/C NOT FOR ALL

A. If the fault symptom is identified by a high idle speed on both engines:

Do a check of the Post Flight Report (PFR) and the scheduled maintenance report for ECAM status EIU and/or for failure messages relative to the bleed system and do the associated troubleshooting.

(1) If the A/C is under MMEL 36-11-02 (Pressure Regulating Valve (PRV) secured closed), troubleshoot per (Ref. TSM TASK 36-11-00-810-809) or (Ref. TSM TASK 36-11-00-810-810).
(a) If nothing is found:

Replace the CONT-AIR COND SYSTEM 1 [47HH] and CONT-AIR COND SYSTEM 2 [57HH] AMM 21-61-34-000-002 and AMM 21-61-34-400-002.

(2) If the fault continues:

Do a check of the aircraft wiring between the ACSCs (47HH, 57HH) and both EIUs ASM 732506:

(a) 47HH pins AA/7E, 7F to the first terminal block
(b) 57HH pins AA/7E, 7F to the first terminal block.
(3) If nothing is found or if the fault continues:

With the ANTI ICE/WING pushbutton switch (3DL) released, make sure that there is ground at pin AA/C2 of this pushbutton switch.

(a) If there is no ground:

Replace the P/BSW-ANTI ICE/WING [3DL] AWM 301101.

(b) If there is ground or if the fault continues:

Troubleshoot as per (Ref. TSM TASK 36-11-00-810-829) and (Ref. TSM TASK 36-11-00-810-830) to check 10HA1, 10HA2 and 4001HA1, 4001HA2.

Subtask 71-00-00-710-057-A ** ON A/C NOT FOR ALL

B. Test
(1) Start the engines AMM 71-00-00-710-003.
(2) Check that the idle speed is correct.

[Rev.8 from Aug 2018] 2026.04.04 04:34:56 UTC