Removal of the ACT Pressure Holding Valve

TASK 28-28-48-000-001-A
Removal of the ACT Pressure Holding Valve

WARNING: BEFORE YOU DO WORK IN OR NEAR A FUEL TANK, MAKE SURE THAT YOU OBEY ALL THE SAFETY PROCEDURES. THIS WILL PREVENT INJURY TO PERSONS AND/OR DAMAGE TO THE AIRCRAFT.

WARNING: BE CAREFUL NOT TO GET AIRCRAFT FUEL IN YOUR MOUTH OR IN YOUR EYES. IF YOU GET FUEL ON YOUR SKIN OR ON YOUR CLOTHES, FLUSH IT IMMEDIATELY WITH WATER. IF NECESSARY, GET MEDICAL HELP. AIRCRAFT FUEL IS POISONOUS.

WARNING: DO NOT GET YOUR CLOTHES SOAKED WITH FUEL.

WARNING: MAKE SURE THAT YOU HAVE THE CORRECT FIRE FIGHTING EQUIPMENT AVAILABLE.

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	WARNING NOTICE(S)

B. Referenced Information

REFERENCE	DESIGNATION
TASK 24-42-00-861-001-A	Energize the Ground Service Network from the External Power
TASK 28-00-00-910-001-A	Fuel Safety Procedures
TASK 28-10-00-910-001-A	Safety Procedures When You Do Work in a Fuel Tank
TASK 28-11-27-000-001-A	Removal of the Additional Center Tank (ACT)
TASK 28-11-37-000-001-A	Removal of the Inner Manhole-Cover ACT
TASK 28-11-37-000-004-A	Removal of the Outer Manhole-Cover ACT
TASK 28-25-00-650-001-A	Pressure Defuel
TASK 28-25-00-650-005-A	To Drain the Remaining Fuel from the Additional Center Tank (ACT)

3. Job Set-up
Subtask 28-28-48-860-050-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) Obey the fuel safety procedures (Ref. AMM TASK 28-00-00-910-001).
(2) Energize the ground service network
(Ref. AMM TASK 24-42-00-861-001).
(3) Transfer the fuel from the Additional Center Tank (ACT) to the center tank (Ref. AMM TASK 28-25-00-650-001).
(4) Drain the remaining fuel from the ACT (Ref. AMM TASK 28-25-00-650-005).
(5) Put the WARNING NOTICE(S) in position on:
- the refuel/defuel panel 801VU,
- the fuel panel 40VU,
to tell persons not to operate the refuel/defuel system.

Subtask 28-28-48-010-050-A ** ON A/C NOT FOR ALL

B. Get Access

NOTE: To remove equipment from inside of an ACT, you must remove the ACT from the aircraft.

(1) Remove the applicable Additional Center Tank (ACT) (Ref. AMM TASK 28-11-27-000-001).
(2) Remove the applicable ACT Manhole Covers (Ref. AMM TASK 28-11-37-000-004) (Ref. AMM TASK 28-11-37-000-001).

4. Procedure
Subtask 28-28-48-020-050-A ** ON A/C NOT FOR ALL

A. Removal of the Pressure Holding Valve

NOTE: This procedure must be done in the workshop only because of the possibility that the bladder tank can be damaged.

(1) Obey the safety procedures when you work in a fuel tank (Ref. AMM TASK 28-10-00-910-001).
(2) Remove the pressure holding valve in the workshop.

[Rev.10 from 2021] 2026.04.02 06:17:59 UTC