Removal of the Drain Mast

TASK 28-13-43-000-001-A
Removal of the Drain Mast

WARNING: OBEY THE FUEL SAFETY PROCEDURES.

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	PLUG - BLANKING

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
148FB

C. Referenced Information

REFERENCE	DESIGNATION
TASK 28-00-00-910-001-A	Fuel Safety Procedures
TASK 53-35-13-000-001-A	Removal of the Belly Fairing Access Panels
Drain Mast

3. Job Set-up
Subtask 28-13-43-941-050-A

A. Safety Precautions
(1) Obey the fuel safety procedures (Ref. AMM TASK 28-00-00-910-001).

Subtask 28-13-43-010-050-A

B. Get Access
(1) Remove the access panel 148FB on the right side from the belly fairing (Ref. AMM TASK 53-35-13-000-001).

4. Procedure
Subtask 28-13-43-020-050-A

A. Removal of the Drain Mast
(1) Loosen the nut (8) which connects the APU vent-pipe (1) to the straight union (7). Make sure that the APU vent-pipe (1) attachment is loose.
(2) Remove the screws (4) from the drain mast (5).

NOTE: The drain mast stays in position because the sealant holds it in its position.

(3) Remove the drain mast (5) from the fuselage.
(4) Remove and discard the O-ring (3) from the center tank vent-pipe (2).
(5) Put the PLUG-BLANKING in each disconnected line end.

[Rev.10 from 2021] 2026.04.01 07:25:59 UTC