Removal of the On-Board Airport Navigation Computer (OANC)

TASK 34-38-34-000-801-A
Removal of the On-Board Airport Navigation Computer (OANC)

ZONE: 121
FIN: 1FX ** ON A/C NOT FOR ALL

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

REFERENCE	QTY	DESIGNATION
No specific	AR	CAP - BLANKING
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
121	AVIONICS COMPARTMENT

C. Referenced Information

REFERENCE	DESIGNATION
TASK 24-41-00-861-002-A	Energize the Aircraft Electrical Circuits from the External Power
TASK 24-41-00-861-002-A-01	Energize the Aircraft Electrical Circuits from the APU
TASK 24-41-00-861-002-A-02	Energize the Aircraft Electrical Circuits from Engine 1(2)
TASK 52-41-00-010-002-A	Open the Avionics Compartment Doors for Access
On-Board Aircraft Navigation Computer (OANC)

3. Job Set-up
Subtask 34-38-34-860-050-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) Energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-861-002).

Subtask 34-38-34-865-050-A ** ON A/C NOT FOR ALL

B. Open, safety and tag this(these) circuit breaker(s):

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

Subtask 34-38-34-010-050-A ** ON A/C NOT FOR ALL

C. Get access to the avionics compartment.
(Ref. AMM TASK 52-41-00-010-002).

4. Procedure
Subtask 34-38-34-020-050-A ** ON A/C NOT FOR ALL

A. Removal of the OANC
(1) Loosen the knurled nuts (4).
(2) Lower the knurled nuts (4).
(3) Pull the OANC (1) on its rack (3) to disconnect the electrical connectors.
(4) Remove the OANC (1).
(5) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.

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