Installation of the On-Board Airport Navigation Computer (OANC) Mass-Memory Card

TASK 34-38-34-400-802-A
Installation of the On-Board Airport Navigation Computer (OANC) Mass-Memory Card

ZONE: 121

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
121	AVIONICS COMPARTMENT
811

C. Referenced Information

REFERENCE	DESIGNATION
TASK 24-42-00-861-001-A	Energize the Ground Service Network from the External Power
TASK 24-42-00-862-001-A	De-energize the Ground Service Network Supplied from the External Power
TASK 34-38-00-610-801-A	Uploading of Software to the Onboard Airport Navigation Computer (OANC)
OANC Mass-Memory Card

3. Job Set-up
Subtask 34-38-34-860-053-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) Make sure that the ground service network is energized
(Ref. AMM TASK 24-42-00-861-001).

Subtask 34-38-34-865-054-A ** ON A/C NOT FOR ALL

B. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
121VU	OANS CMPTR	2FX	L10

Subtask 34-38-34-010-053-A ** ON A/C NOT FOR ALL

C. Get Access
(1) Make sure that the ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE is in position.
(2) Make sure that access door 811 is open.

4. Procedure
Subtask 34-38-34-420-051-A ** ON A/C NOT FOR ALL

A. Installation of the On-Board Airport Navigation Computer (OANC) Mass-Memory Card

CAUTION: OBEY THE ELECTROSTATIC-DISCHARGE SAFETY PRECAUTIONS WHEN YOU DO MAINTENANCE ON OR NEAR DEVICES THAT ARE SENSITIVE TO ELECTROSTATIC DISCHARGE. IF YOU DO NOT OBEY THESE PRECAUTIONS, YOU CAN CAUSE DAMAGE TO THE EQUIPMENT.

(1) Remove the preformatted OANC mass-memory card (5) from the BAG - ANTISTATIC.
(2) Install the OANC mass-memory card (5) in the OANC (3).
(3) Turn the turnlock fastener (1) a quarter of a turn clockwise to close the access door (2).

Subtask 34-38-34-865-055-A ** ON A/C NOT FOR ALL

B. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
121VU	OANS CMPTR	2FX	L10

Subtask 34-38-34-610-051-A ** ON A/C NOT FOR ALL

C. Do the uploading of the software to the OANC (Ref. AMM TASK 34-38-00-610-801).

5. Close-up
Subtask 34-38-34-410-051-A ** ON A/C NOT FOR ALL

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close access door 811.
(3) Remove the access platform(s).

Subtask 34-38-34-862-051-A ** ON A/C NOT FOR ALL

B. De-energize the ground service network
(Ref. AMM TASK 24-42-00-862-001).

[Rev.10 from 2021] 2026.04.02 06:23:19 UTC