LED anti-collision light - The Lower Anti-Collision Beacon Light does not flash but the Upper Anti-Collision Beacon Light flashes

TASK 33-48-00-810-807-A
LED anti-collision light - The Lower Anti-Collision Beacon Light does not flash but the Upper Anti-Collision Beacon Light flashes

1. Possible Causes

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
TSM TASK 33-48-00-810-804-A	LED anti-collision light - The Lower Anti-Collision Beacon Light does not flash
AMM 33-48-00-710-001	Operational Test of the Anti-Collision Lighting

3. Fault Confirmation
Subtask 33-48-00-710-065-A

A. Do the Operational Test of the Anti-Collision Lighting AMM 33-48-00-710-001.

4. Fault Isolation
Subtask 33-48-00-810-062-A

A. If the test confirms the fault:
(1) Do a visual inspection of the lower anti-collision beacon light and make sure that the lens drain plug is not installed. This is necessary to prevent any condensation or liquid from collecting inside the light unit and allowing the liquid to drain away.
(2) Do a visual inspection of the installation around the lower power supply unit and check for any signs of corrosion, fluid or condensation on the connectors and wiring between the lower power supply unit and the lower anti-collision beacon light
(a) If signs of corrosion, fluid or condensation are found, make sure that the corroded parts are replaced and the area is cleaned and fully dried.
(3) Operate the cockpit EXT LT BEACON-SWITCH (2LV):
(a) Toggle the cockpit EXT LT BEACON-SWITCH (2LV) to OFF position for more than 3 seconds.
(b) Toggle the cockpit EXT LT BEACON-SWITCH (2LV) to ON position.
(4) If the lower anti-collision beacon light flashes, no more actions are necessary.

Subtask 33-48-00-810-063-A

B. If the fault continues:
(1) Do the troubleshooting procedure (Ref. TSM TASK 33-48-00-810-804).

5. Close-up
Subtask 33-48-00-860-055-A

A. Make sure that the work area is clean and clear of tools and other items.

[Rev.8 from Aug 2018] 2026.04.04 04:32:02 UTC