Loss of the OANC Data on the F/O ND

TASK 31-63-82-810-830-A
Loss of the OANC Data on the F/O ND

1. Possible Causes

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
ESPM 205225
ESPM 2053280
ESPM 205560
AMM 31-60-00-740-007	GROUND SCANNING Test of the DMC
AWM 316136
AMM 31-63-22-000-001	Removal of the Display Unit
AMM 31-63-22-400-001	Installation of the Display Unit
AMM 34-38-34-000-801	Removal of the On-Board Airport Navigation Computer (OANC)
AMM 34-38-34-400-801	Installation of the On-Board Airport Navigation Computer (OANC)

3. Fault Confirmation
Subtask 31-63-82-740-087-A ** ON A/C NOT FOR ALL

A. Test
(1) Do the ground scanning test of the DMC AMM 31-60-00-740-007.

4. Fault Isolation
Subtask 31-63-82-810-159-A ** ON A/C NOT FOR ALL

A. If the test confirms the fault:

CAUTION: BE VERY CAREFUL WITH THE OPTICAL FIBERS. IT IS EASY TO CAUSE DAMAGE TO THE FIBERS.

(1) If the optical fiber test is not OK:

Replace the optical fiber cable ESPM 2053280 from the F/O ND DU (3WT2) pin AA/5 to the OANC (1FX) pin AA/LL AWM 316136.
Install the OANC (1FX) AMM 34-38-34-400-801.
Install the F/O ND DU (3WT2) AMM 31-63-22-400-001.

(2) If the optical fiber test is OK:

(3) If the fault continues:

Subtask 31-63-82-740-088-A ** ON A/C NOT FOR ALL

B. Do the test given in Para. 3.B.

[Rev.8 from Aug 2018] 2026.04.04 04:31:15 UTC