Removal of the Dual-Flow and Shut-off Valve

TASK 47-21-43-000-001-A
Removal of the Dual-Flow and Shut-off Valve

WARNING: PUT THE SAFETY DEVICES AND THE WARNING NOTICES IN POSITION BEFORE YOU START A TASK ON OR NEAR:

THE FLIGHT CONTROLS
THE FLIGHT CONTROL SURFACES
THE LANDING GEAR AND THE RELATED DOORS
COMPONENTS THAT MOVE.

MOVEMENT OF COMPONENTS CAN KILL OR CAUSE INJURY TO PERSONS AND/OR CAN CAUSE DAMAGE TO THE EQUIPMENT.

WARNING: YOU MUST PUT ON AND ATTACH A SAFETY HARNESS BEFORE YOU START WORK:

ON THE THS OR IN THE REAR FUSELAGE
ON TOP OF THE WINGS OR PYLONS.

WITHOUT A SAFETY HARNESS, YOU CAN FALL. THIS CAN KILL YOU OR CAUSE YOU INJURY.

WARNING: DO NOT GO INTO THE WORK AREA UNTIL A MINIMUM OF 5 MINUTES AFTER YOU REMOVE THE ACCESS PANEL. LET AIR FLOW THROUGH THE WORK AREA. AIR FROM THIS SYSTEM HAS A LOW OXYGEN CONTENT AND CAN CAUSE INJURY OR DEATH.

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

FIN: 6YA ** ON A/C NOT FOR ALL

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	ACCESS PLATFORM 2M (6 FT)
No specific	AR	CAP - BLANKING
No specific	AR	PLUG - BLANKING
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	1	TIE WRAP

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
191AB

C. Referenced Information

REFERENCE	DESIGNATION
TASK 24-41-00-861-002-A	Energize the Aircraft Electrical Circuits from the External Power
TASK 24-41-00-861-002-A-01	Energize the Aircraft Electrical Circuits from the APU
TASK 24-41-00-861-002-A-02	Energize the Aircraft Electrical Circuits from Engine 1(2)
TASK 53-25-11-000-001-A	Removal of the Forward Belly Fairing Panels (191AT, 192AT, 191AB, 192AB)
Dual-Flow and Shut-off Valve

3. Job Set-up
Subtask 47-21-43-860-050-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) Energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-861-002)

Subtask 47-21-43-865-050-A ** ON A/C NOT FOR ALL

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
121VU	IGGS/CTRL	7YA	N28
** ON A/C NOT FOR ALL
121VU	IGGS/CTRL	7YA	P28
** ON A/C NOT FOR ALL
122VU	CSAS / CTRL	1HW	U17

Subtask 47-21-43-010-050-A ** ON A/C NOT FOR ALL

C. Get Access
(1) Put an ACCESS PLATFORM 2M (6 FT) in position at zone 191.
(2) Remove forward belly-fairing panel 191AB (Ref. AMM TASK 53-25-11-000-001).

4. Procedure
Subtask 47-21-43-020-050-B ** ON A/C NOT FOR ALL

A. Removal of the Dual-Flow and Shut-off Valve

CAUTION: BE CAREFUL WHEN YOU TOUCH THIS ASSEMBLY. IT HAS PRECISION- TOLERANCE COMPONENTS WITH VERY POLISHED SURFACES. IF YOU ARE NOT CAREFUL, IT IS VERY EASY TO CAUSE DAMAGE TO THESE COMPONENTS (INTERNAL CONTAMINATION, EXTERNAL IMPACT DAMAGE).

(1) Disconnection of the electrical connector (6).
(a) Disconnect the electrical connector (6) from the Dual-Flow and Shut-off Valve (DFSOV) (9).
(b) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
(c) Attach the electrical connector (6) with a TIE WRAP to the IGGS pallet (1).
(2) Release and remove the coupling assembly (4).

NOTE: The clamp and the sleeve fit together to make one coupling assembly (4).

(a) Pull up the latch pawls of the clamp to remove and retain the clamp.
(b) Move the sleeve across the packing (5) to the inlet fitting DFSOV (9), until the sleeve is at the bottom.

NOTE: Do not remove the sleeve until you remove the DFSOV (9).

(3) Release and remove the coupling assembly (11).

NOTE: The clamp and the sleeve fit together to make one coupling assembly (11).

(a) Pull up the latch pawls of the clamp to remove and retain the clamp.
(b) Move the sleeve across the packing (10) to the outlet fitting DFSOV (9), until the sleeve is at the bottom.

NOTE: Do not remove the sleeve until you remove the DFSOV (9).

(4) Remove the bolts (8), the washers (7) and the DFSOV (9).
(5) Remove and discard the packing (3) from the duct assembly (2).
(6) Remove and discard the packing (12) from the duct assembly (13).
(7) Remove the sleeve from the DFSOV (9).
(8) Keep the sleeve with the coupling assembly (4).
(9) Remove the sleeve from the DFSOV (9).
(10) Keep the sleeve with the coupling assembly (11).
(11) Remove and discard the packing (5) and (10) from the DFSOV (9).
(12) Put the PLUG-BLANKING in each disconnected line end.

[Rev.10 from 2021] 2026.04.02 06:43:07 UTC