Installation of the Tail Navigation-Light Transformer

TASK 33-41-16-400-001-A
Installation of the Tail Navigation-Light Transformer

WARNING: MAKE SURE THAT ALL THE CIRCUITS IN MAINTENANCE ARE ISOLATED BEFORE YOU SUPPLY ELECTRICAL POWER TO THE AIRCRAFT. UNWANTED ELECTRICAL POWER CAN BE DANGEROUS.

WARNING: PUT THE SAFETY DEVICES AND THE WARNING NOTICES IN POSITION BEFORE YOU START A TASK ON OR NEAR:

THE FLIGHT CONTROLS
THE FLIGHT CONTROL SURFACES
THE LANDING GEAR AND THE RELATED DOORS
COMPONENTS THAT MOVE.

MOVEMENT OF COMPONENTS CAN KILL OR CAUSE INJURY TO PERSONS AND/OR CAN CAUSE DAMAGE TO THE EQUIPMENT.

WARNING: BEFORE YOU START WORK, YOU MUST PUT ON A SAFETY HARNESS AND ATTACH IT TO THE ACCESS PLATFORM. WITHOUT A SAFETY HARNESS, YOU CAN FALL. THIS CAN KILL YOU OR CAUSE YOU INJURY.

WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.

ZONE: 317
FIN: 13LA ** ON A/C NOT FOR ALL

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Consumable Materials

REFERENCE	DESIGNATION
(Material No.06AEA1)	Polysulfide Sealant-Low Adhesion Brushable -
(Material No.06BHG1)	Silicone Sealant-Firewall High Temp. -
(Material No.06LCG9)	Non Hardening Jointing Putty-Medium Temp. Area - -

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
317	TAIL CONE APU AND ACCESSORY COMPARTMENT

C. Referenced Information

REFERENCE	DESIGNATION
TASK 20-28-00-912-802-A	Electrical Bonding - General Maintenance Procedure
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 33-41-00-710-001-A	Operational Test of the Navigation Lights
TASK 33-41-15-000-001-A	Removal of the Tail Navigation Light
TASK 33-41-15-400-001-A	Installation of the Tail Navigation Light
TASK 33-48-00-710-002-A	Operational Test of the Anti-Collision/Strobe Lighting
TASK 52-41-18-000-001-A	Removal of the APU Exhaust Access-Fairing
TASK 52-41-18-400-001-A	Installation of the APU Exhaust Access-Fairing
Tail Navigation-Light Transformer 13LA

3. Job Set-up
Subtask 33-41-16-941-052-A ** ON A/C NOT FOR ALL

A. Safety Precautions
(1) In the cockpit, on panel 25VU:

Make sure that the STROBE switch is in the OFF position.
Make sure that the NAV & LOGO switch is in the OFF position.
Make sure that the APU MASTER SW pushbutton switch is in the OFF position.
Make sure there is a warning notice to tell persons not to operate the navigation lights or the strobe lights.
Make sure there is a warning notice to tell persons not to operate the APU.

Subtask 33-41-16-865-051-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	APU/APU/CTL	2KD	L42
121VU	APU/ECB/SPLY	1KD	L41
** ON A/C NOT FOR ALL
122VU	LIGHTING/EXT LT/NAV1/AND LOGO/LT	1LA	T03
** ON A/C NOT FOR ALL
122VU	LIGHTING/EXT LT/NAV2/AND LOGO/LT	2LA	T02
122VU	LIGHTING/WING/STROBE	10LV	V05
** ON A/C NOT FOR ALL
122VU	LIGHT/EXT LT NAV1/AND LOGO/LT	1LA	T03

Subtask 33-41-16-941-053-A ** ON A/C NOT FOR ALL

C. Get Access
(1) Make sure that the ACCESS PLATFORM 5M (16 FT)- ADJUSTABLE is in position in the APU tail-cone-exhaust area.
(2) Make sure that you removed the exhaust access-fairing (Ref. AMM TASK 52-41-18-000-001) or, as an alternative, the tail navigation light (Ref. AMM TASK 33-41-15-000-001).

4. Procedure
Subtask 33-41-16-910-050-A ** ON A/C NOT FOR ALL

A. Preparation for Installation
(1) Clean the component interfaces and the adjacent area.
(2) Do an inspection of the component interfaces and the adjacent area.
(3) Apply Polysulfide Sealant-Low Adhesion Brushable - (Material No.06AEA1) to the mating surfaces.
(4) Apply Non Hardening Jointing Putty-Medium Temp. Area - - (Material No.06LCG9) to the screws (2) and (7) and the washers (3) and (6).

Subtask 33-41-16-420-050-A ** ON A/C NOT FOR ALL

B. Installation of the Tail Navigation-Light Transformer
(1) Install the transformer plate (5) with the transformer in the APU exhaust access-fairing.
(2) Install the screw (2) and the washer (3) for bonding (Ref. AMM TASK 20-28-00-912-802).
(3) Install the screws (7) and the washers (6).
(4) Tighten the screws (2) and (7).
(5) Apply Silicone Sealant-Firewall High Temp. - (Material No.06BHG1) to the screws (2) and (7) and the washers (3) and (6).
(6) Remove the blanking caps from the electrical connectors.
(7) Connect the electrical connectors (1) and (4).

Subtask 33-41-16-410-050-A ** ON A/C NOT FOR ALL

C. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Install the APU exhaust access-fairing (Ref. AMM TASK 52-41-18-400-001) or, as an alternative, the tail navigation light (Ref. AMM TASK 33-41-15-400-001).
(3) Remove the WARNING NOTICE(S).

Subtask 33-41-16-865-052-A ** ON A/C NOT FOR ALL

D. 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	APU/APU/CTL	2KD	L42
121VU	APU/ECB/SPLY	1KD	L41
** ON A/C NOT FOR ALL
122VU	LIGHTING/EXT LT/NAV1/AND LOGO/LT	1LA	T03
** ON A/C NOT FOR ALL
122VU	LIGHTING/EXT LT/NAV2/AND LOGO/LT	2LA	T02
122VU	LIGHTING/WING/STROBE	10LV	V05
** ON A/C NOT FOR ALL
122VU	LIGHT/EXT LT NAV1/AND LOGO/LT	1LA	T03

Subtask 33-41-16-710-050-A ** ON A/C NOT FOR ALL

E. Test
(1) Do the operational test of the tail navigation lights (Ref. AMM TASK 33-41-00-710-001) and (Ref. AMM TASK 33-48-00-710-002).

5. Close-up
Subtask 33-41-16-942-050-A ** ON A/C NOT FOR ALL

A. Remove the access platform(s).

Subtask 33-41-16-862-051-A ** ON A/C NOT FOR ALL

B. Make sure that the aircraft electrical circuits are de-energized
(Ref. AMM TASK 24-41-00-862-002).

Subtask 33-41-16-860-050-A ** ON A/C NOT FOR ALL

C. Aircraft Maintenance Configuration
(1) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.01 12:46:34 UTC