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

TASK 34-38-34-400-801-A
Installation 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. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
121	AVIONICS COMPARTMENT

B. 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 24-41-00-862-002-A	De-energize the Aircraft Electrical Circuits Supplied from the External Power
TASK 24-41-00-862-002-A-01	De-energize the Aircraft Electrical Circuits Supplied from the APU
TASK 24-41-00-862-002-A-02	De-energize the Aircraft Electrical Circuits Supplied from the Engine 1(2)
TASK 34-38-00-610-801-A	Uploading of Software to the Onboard Airport Navigation Computer (OANC)
TASK 34-38-00-740-801-A	BITE Test of the Onboard Aircraft Navigation System (OANS) (System Test)
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 34-38-34-860-051-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 34-38-34-865-051-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 34-38-34-010-051-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 34-38-34-420-050-A ** ON A/C NOT FOR ALL

A. Installation of the OANC
(1) Clean the component interface and/or the adjacent area.
(2) Do an inspection of the component interfaces and the adjacent area.
(3) Remove the CAP-BLANKING from each electrical connector and receptacle.
(4) Make sure that all the electrical connections are clean and in the correct condition.
(5) Do a visual inspection of the optic fiber and make sure that the optic fiber is clean and in correct conditions.
(6) Unlock and Open the cover plate (6) on the OANC front face.
(7) Make sure that the mass memory card (7) is engaged into the front panel access (8).
(8) Close and lock the cover plate (6).
(9) Install the OANC (1) on its rack (3).
(10) Push the OANC (1) on its rack (3) to connect the electrical connectors (2).
(11) Engage the knurled nuts (4) on the lugs (5) and tighten.

Subtask 34-38-34-865-052-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 34-38-34-610-050-A ** ON A/C NOT FOR ALL

C. Do a check of the configuration of the OANC and, if necessary, upload the applicable software (Ref. AMM TASK 34-38-00-610-801).

Subtask 34-38-34-740-050-A ** ON A/C NOT FOR ALL

D. Do the BITE test (System Test) of the OANS (Ref. AMM TASK 34-38-00-740-801).

5. Close-up
Subtask 34-38-34-410-050-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 the access door 811.
(3) Remove the access platform(s).

Subtask 34-38-34-862-050-A ** ON A/C NOT FOR ALL

B. De-energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-862-002).

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