Engine Acceleration on Ground with no Order, on Engine 1 or 2

TASK 73-00-00-810-874-A
Engine Acceleration on Ground with no Order, on Engine 1 or 2

1. Possible Causes

HMU-1 [4000KC1]
HMU-2 [4000KC2]

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 71-00-00-710-006	Minimum Idle Check
AMM 73-21-10-000-001	Removal of the Hydromechanical Unit (HMU)
AMM 73-21-10-000-002	Removal of the Hydromechanical Unit (HMU)
AMM 73-21-10-400-001	Installation of the Hydromechanical Unit (HMU)
AMM 73-21-10-400-002	Installation of the Hydromechanical Unit (HMU)

3. Fault Confirmation
Subtask 73-00-00-710-194-A ** ON A/C NOT FOR ALL

A. Test
Not applicable, the fault is evident.

4. Fault Isolation
Subtask 73-00-00-810-124-A ** ON A/C NOT FOR ALL

A. If the fault symptom is identified by the crew observation: engine acceleration on ground with no order:
(1) Make sure that the throttle control lever was in idle position during the start.
(2) Replace the HMU-1 [4000KC1] ( HMU-2 [4000KC2] ) AMM 73-21-10-000-001 and AMM 73-21-10-400-001.

Subtask 73-00-00-810-124-B ** ON A/C NOT FOR ALL

Subtask 73-00-00-710-195-A ** ON A/C NOT FOR ALL

B. Do a minimum idle check AMM 71-00-00-710-006.

[Rev.8 from Aug 2018] 2026.04.04 04:35:12 UTC