Deactivation of the Vent Valve in the Open Position

TASK 28-28-00-040-003-A
Deactivation of the Vent Valve in the Open Position

WARNING: OBEY THE FUEL SAFETY PROCEDURES.

FIN: 167QM1 ** ON A/C NOT FOR ALL
FIN: 167QM2 ** ON A/C NOT FOR ALL
Task Summary

Access	Test	Specific Tools	Mhr	E/T	Nb Men
YES	NO	YES	0.8	0.8	1

1. Reason for the Job
MMEL 28-28-06A
ACT VENT VALVE
MMEL 28-28-06D
ACT VENT VALVE
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	ACCESS PLATFORM 2M (6 FT)
No specific	1	BRIDGE-WIRE
No specific	AR	CAP - BLANKING
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	1	TIE WRAP(S)
No specific	1	WARNING NOTICE(S)
T720521	1	TOOL-VALVE LOCKING

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
252BG

C. Referenced Information

REFERENCE	DESIGNATION
TASK 24-42-00-861-001-A	Energize the Ground Service Network from the External Power
TASK 24-42-00-862-001-A	De-energize the Ground Service Network Supplied from the External Power
TASK 28-00-00-910-001-A	Fuel Safety Procedures
TASK 28-11-49-000-001-A	Removal of the ACT Integrated Impact Wall
TASK 28-11-49-400-001-A	Installation of the ACT Integrated Impact Wall
TASK 52-30-00-860-001-A	Open the FWD or Aft Cargo-Compartment Door with the Yellow Electric Pump
TASK 53-42-12-000-001-A	Removal of the Cabin Floor Panels from FR47 thru FR64
TASK 53-42-12-400-001-A	Installation of the Cabin Floor Panels from FR47 thru FR64
ACT Vent Valve 167QM

3. Job Set-up
Subtask 28-28-00-860-079-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) Obey the fuel safety procedures when you do work on the fuel system (Ref. AMM TASK 28-00-00-910-001).
(2) Energize the ground service network
(Ref. AMM TASK 24-42-00-861-001).
(3) Put a WARNING NOTICE(S) in position:

On the APU section of the overhead panel 25VU, to tell persons not to operate the APU/MASTER SW pushbutton switch.
On the refuel/defuel control panel 801VU.
On the FUEL section of the panel 40VU, to tell persons not to operate the fuel system.
On the ENG/APU FIRE panel located on the overhead panel 20VU, to tell persons not to operate the fire extinguishing system.

Subtask 28-28-00-010-055-A ** ON A/C NOT FOR ALL

B. Get Access
(1) Open the aft cargo-compartment door (Ref. AMM TASK 52-30-00-860-001).
(2) Put an ACCESS PLATFORM 2M (6 FT) in position at the aft cargo door opening.
(3) Loosen the quick-release fasteners to remove the right Integrated Impact Wall (Ref. AMM TASK 28-11-49-000-001).

Subtask 28-28-00-010-055-C ** ON A/C NOT FOR ALL

B. Get Access
(1) Open the aft cargo-compartment door (Ref. AMM TASK 52-30-00-860-001).
(2) Put an ACCESS PLATFORM 2M (6 FT) in position at the aft cargo door opening.
(3) For ACT2:

Loosen the quick-release fasteners to remove the right Integrated Impact Wall (Ref. AMM TASK 28-11-49-000-001).

(4) For ACT1:

Remove the cabin floor panel 252BG (Ref. AMM TASK 53-42-12-000-001).
Remove the applicable access panel from the ceiling of the cargo-compartment.

Subtask 28-28-00-865-062-A ** ON A/C NOT FOR ALL

C. Open, safety and tag this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
121VU	ACT1/REFUEL & SPLY	33QU	L29
121VU	ACT1/CTL & SPLY	9QH	P29

4. Procedure
Subtask 28-28-00-040-052-A ** ON A/C NOT FOR ALL

A. Vent Valve Inoperative in the Open Position

NOTE: The Vent Valve can stay in the open position and inoperative when you do the subsequent procedure.

(1) Disconnect the electrical connector (23) from the receptacle (24) of the vent valve actuator (25).
(2) Install a BRIDGE-WIRE (shunt) on the electrical connector (23) between the pins A and C.
(3) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
(4) Safety the electrical connector (23) to the adjacent electrical harness with a TIE WRAP(S).
(5) Do a visual check of the see/feel indicator of the Vent Valve Actuator to identify the position of the valve:

see/feel indicator aligned, the Vent Valve is OPEN,
see/feel indicator across, the Vent Valve is CLOSED.

(6) Loosen the screw (27) and disconnect the V-clamp (26) from the V-flange of the Vent Valve (28).
(7) Remove the Vent Valve Actuator (25) from the Vent Valve (28).
(8) Manually turn the input shaft (31) of the Vent Valve (28) to the open position.
(9) Install the T720521 TOOL-VALVE LOCKING on the V-flange of the Vent Valve (28) with V-clamp (26) to lock it in the open position.

Subtask 28-28-00-040-052-B ** ON A/C NOT FOR ALL

A. Vent Valve Inoperative in the Open Position

NOTE: The subsequent procedure is the same for each ACT. Therefore only one procedure is given. Differences between each ACT are given where applicable.

NOTE: The Vent Valve can stay in the open position and inoperative when you do the subsequent procedure.

(1) Disconnect the electrical connector (23) from the receptacle (24) of the Vent Valve Actuator (25).
(2) Install a BRIDGE-WIRE (shunt) on the electrical connector (23) between the pins A and C.
(3) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
(4) Safety the electrical connector (23) to the adjacent electrical harness with a TIE WRAP(S).
(5) Do a visual check of the see/feel indicator of the Vent Valve Actuator to identify the position of the valve:

see/feel indicator aligned, the Vent Valve is OPEN,
see/feel indicator across, the Vent Valve is CLOSED.

5. Close-up
Subtask 28-28-00-865-063-A ** ON A/C NOT FOR ALL

A. 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	ACT1/REFUEL & SPLY	33QU	L29
121VU	ACT1/CTL & SPLY	9QH	P29

Subtask 28-28-00-860-080-A ** ON A/C NOT FOR ALL

B. Put the aircraft back to the serviceable condition.
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Install the Integrated Impact Wall (Ref. AMM TASK 28-11-49-400-001).
(3) Remove the access platform(s).
(4) Close the aft cargo-compartment door (Ref. AMM TASK 52-30-00-860-001).
(5) De-energize the ground service network
(Ref. AMM TASK 24-42-00-862-001).
(6) Remove the WARNING NOTICE(S).
(7) Make an entry in the logbook.

Subtask 28-28-00-860-080-C ** ON A/C NOT FOR ALL

B. Put the aircraft back to the serviceable condition.
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Install the access panel in the ceiling of the cargo compartment.
(3) Install the cabin floor panel 252BG (Ref. AMM TASK 53-42-12-400-001).
(4) Install the right Integrated Impact Wall (Ref. AMM TASK 28-11-49-400-001).
(5) Remove the access platform(s).
(6) Close the aft cargo-compartment door (Ref. AMM TASK 52-30-00-860-001).
(7) De-energize the ground service network
(Ref. AMM TASK 24-42-00-862-001).
(8) Remove the WARNING NOTICE(S).
(9) Make an entry in the logbook.

[Rev.10 from 2021] 2026.04.02 06:17:49 UTC