Continuous Running of the Power Transfer Unit (PTU) After Start in Sequence of Engine 1 and Engine 2

TASK 29-23-00-810-805-A
Continuous Running of the Power Transfer Unit (PTU) After Start in Sequence of Engine 1 and Engine 2

1. Possible Causes

MANIFOLD,PTU [3015GM]

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
TSM TASK 29-23-00-810-802-A	Continuous Running of the Power Transfer Unit (PTU)
AMM 29-13-15-000-001	Removal of the Power Transfer Unit (PTU) Manifold of the Yellow Hydraulic System
AMM 29-13-15-400-001	Installation of the Power Transfer Unit (PTU) Manifold of the Yellow Hydraulic System
AMM 71-00-00-710-003	Engine Automatic Start
AMM 71-00-00-710-028	Engine Shutdown

3. Fault Confirmation
Subtask 29-23-00-710-058-A

A. Do this test.
(1) Make sure that the PTU P/BSW is in the AUTO position.
(2) Start the engine No. 1 AMM 71-00-00-710-003.
(3) Start the engine No. 2 AMM 71-00-00-710-003.
(4) Do a check of the PTU for continuous running.
(a) If there is continuous running, do the subsequent steps:
1 On the overhead panel 40VU, set the GREEN/ENG 1 PUMP P/BSW to the OFF position, and after some seconds, back to the ON position.

NOTE: The GREEN/ENG 1 PUMP is set back to its initial configuration when you set the GREEN/ENG 1 PUMP P/BSW to ON again.

2 Do again a check for continuous running of the PTU.
(5) Shut down the engines AMM 71-00-00-710-028.

4. Fault Isolation
Subtask 29-23-00-810-056-C

A. If after start of the engine No. 2:
(1) The PTU starts continuous running and stops after you have switched off and on the GREEN/ENG 1 PUMP P/BSW:

Replace the MANIFOLD,PTU [3015GM] AMM 29-13-15-000-001 and AMM 29-13-15-400-001.

(2) If the fault continues:

Do the troubleshooting of the continuous running of the PTU (Ref. TSM TASK 29-23-00-810-802).

Subtask 29-23-00-710-059-A

B. Do the fault confirmation procedure as given in Para. 3. to make sure that operation is correct.

[Rev.8 from Aug 2018] 2026.04.04 04:29:28 UTC