Missing PTU-arrow on the ECAM

TASK 29-23-00-810-810-A
Missing PTU-arrow on the ECAM

1. Possible Causes

DU-ECAM, UPPER [4WT1]

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 29-23-00-710-002	Functional Check of the Power Transfer Unit (PTU) Green to Yellow
AMM 29-23-00-710-003	Functional Check of the Power Transfer Unit (PTU) Yellow to Green
AMM 31-60-00-710-002	Operational Test of EFIS/ECAM Switching Functions
AMM 31-60-00-710-005	Operational Check of Correct Operation of EFIS and ECAM DMC Automatic and Manual Transfer
AMM 31-63-22-000-001	Removal of the Display Unit
AMM 31-63-22-400-001	Installation of the Display Unit

3. Fault Confirmation
Subtask 29-23-00-710-067-A

A. Do these tests:
(1) Do the operational check of the PTU GREEN to YELLOW AMM 29-23-00-710-002.
(2) Do the operational check of the PTU YELLOW to GREEN AMM 29-23-00-710-003.

4. Fault Isolation
Subtask 29-23-00-810-062-A ** ON A/C NOT FOR ALL

A. If the Test gives no indication of the PTU arrow on the System Page on the DU-ECAM, UPPER [4WT1] :
(1) Do the operational test of the EFIS/ECAM switching functions AMM 31-60-00-710-002.
(a) If the PTU arrow comes into view during this test on an different ECAM Display Unit:

Replace the defective ECAM Display Unit AMM 31-63-22-000-001 and AMM 31-63-22-400-001.

Subtask 29-23-00-810-062-B ** ON A/C NOT FOR ALL

A. If the test gives no indication of the PTU arrow on the system page on the DU-ECAM, UPPER [4WT1] :
(1) Do the operational test of EFIS/ECAM automatic and manual transfer AMM 31-60-00-710-005.
(a) If the PTU arrow comes into view during this test on a different ECAM Display Unit:

Replace the defective ECAM Display Unit AMM 31-63-22-000-001 and AMM 31-63-22-400-001.

Subtask 29-23-00-710-068-A

B. Do the test as given in para. 3. to make sure that the indication is correct.

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