Cleaning of the Gearbox Vent Tube

TASK 49-26-55-100-801-A
Cleaning of the Gearbox Vent Tube

WARNING: DO NOT TOUCH THE APU UNTIL IT IS SUFFICIENTLY COOL TO PREVENT BURNS WHEN YOU DO THE MAINTENANCE TASK(S).

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

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	BLOWING EQUIPMENT - DRY AIR

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.08BBB1)	Non Aqueous Cleaner-- Petroleum Based -

C. Referenced Information

REFERENCE	DESIGNATION
TASK 49-26-55-000-801-A	Removal of the Gearbox Vent Tube
TASK 49-26-55-400-801-A	Installation of the Gearbox Vent Tube

3. Job Set-up
Subtask 49-26-55-020-050-A ** ON A/C NOT FOR ALL

A. Removal of the Gearbox Vent Tube
(1) Remove the gearbox vent tube (Ref. AMM TASK 49-26-55-000-801).

4. Procedure
Subtask 49-26-55-160-050-A ** ON A/C NOT FOR ALL

A. Cleaning of the Gearbox Vent Tube
(1) Clean the gearbox vent tube and its union fittings to make sure there is no blockage.
(a) Spray the tube and fittings externally and internally with Non Aqueous Cleaner-- Petroleum Based - (Material No.08BBB1) .
(2) Dry the gearbox vent tube.

WARNING: WHEN YOU USE COMPRESSED AIR:

USE THE CORRECT PROTECTION (FACE SHIELD OR GOGGLES)
DO NOT POINT THE AIRFLOW AT YOURSELF OR OTHER PERSONS.

LOOSE PARTICLES AND/OR HIGH PRESSURE AIR CAN CAUSE INJURY.

(a) Use a BLOWING EQUIPMENT - DRY AIR to blow clean compressed air until the gearbox vent tube is free of moisture. Use a maximum pressure of 2 bar (29 psi).
(3) If the vent tube and/or the union fittings are damaged or cleaning is not possible, replace the vent tube and/or the union fittings (Ref. AMM TASK 49-26-55-000-801) and (Ref. AMM TASK 49-26-55-400-801).

5. Close-up
Subtask 49-26-55-420-050-A ** ON A/C NOT FOR ALL

A. Installation of the Gearbox Vent Tube
(1) Install the gearbox vent tube (Ref. AMM TASK 49-26-55-400-801).

[Rev.10 from 2021] 2026.04.01 01:29:19 UTC