Removal of the Check Valve

TASK 29-12-37-000-002-A
Removal of the Check 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: MAKE SURE THAT THE GROUND SAFETY-LOCKS ARE IN POSITION ON THE LANDING GEAR. THIS WILL PREVENT UNWANTED MOVEMENT OF THE LANDING GEAR, AND THUS POSSIBLE INJURY TO PERSONS AND DAMAGE TO THE AIRCRAFT AND/OR EQUIPMENT.

FIN: 2170GM
FIN: 2405GM

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 4M (13 FT)
No specific	1	CONTAINER 5 L (1.32 USGAL)
No specific	AR	SAFETY BARRIER(S)
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	AR	WARNING NOTICE(S)
FOR [2405GM] (CHECK VALVE-FLAP WTB B RETURN, R WING)
No specific	AR	PLUG - BLANKING

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
FOR [2170GM] (CHECK VALVE-FLAP WTB B RETURN, L WING)
575DB
FOR [2405GM] (CHECK VALVE-FLAP WTB B RETURN, R WING)
675DB

C. Referenced Information

REFERENCE	DESIGNATION
TASK 27-50-00-866-008-A	Extension of the Flaps on the Ground
TASK 27-50-00-866-008-A-01	Extension of the Flaps/Slats on the Ground
TASK 27-60-00-866-002-A	Extension-Retraction of the Spoilers for Maintenance
TASK 29-00-00-910-002-A	Safety Procedures of the Hydraulic System
TASK 29-10-00-864-003-A	Depressurize the Blue Hydraulic System
TASK 29-14-00-614-001-A	Depressurization of the Hydraulic Reservoirs
Flap WTB Check Valve 2170GM
Flap WTB Check Valve 2405GM
FOR [2170GM] (CHECK VALVE-FLAP WTB B RETURN, L WING)
TASK 57-51-37-000-004-A	Removal of the Access Panels 575AB(675AB), 575BB(675BB), 575CB(675CB), 575DB(675DB), 575EB(675EB), 575FB(675FB), 575GB(675GB), 575HB(675HB)
FOR [2405GM] (CHECK VALVE-FLAP WTB B RETURN, R WING)
TASK 57-51-37-000-004-A	Removal of the Access Panels 575AB(675AB), 575BB(675BB), 575CB(675CB), 575DB(675DB), 575EB(675EB), 575FB(675FB), 575GB(675GB), 575HB(675HB)

3. Job Set-up
Subtask 29-12-37-941-053-A

A. Safety Precautions

WARNING: OBEY THE HYDRAULIC SAFETY PROCEDURES.

(1) Obey the hydraulic safety procedures (Ref. AMM TASK 29-00-00-910-002).
(2) Put the SAFETY BARRIER(S) in position.
(3) Put a WARNING NOTICE(S) in position to tell persons not to pressurize the Blue hydraulic system.
(4) Put a WARNING NOTICE(S) in position to tell persons not to operate the flaps.

Subtask 29-12-37-860-051-A

B. Aircraft Maintenance Configuration
(1) Extend the flaps fully (Ref. AMM TASK 27-50-00-866-008).
(2) Make sure the 98D27803000000 LOCKING TOOL-FLAP SLAT LEVER,INT. POSITION is on the flap/slat control lever on panel 114VU.
(3) Remove the safety collar from the circuit breakers 10CV and 12CV.
(4) Extend the No.3 spoiler for maintenance (Ref. AMM TASK 27-60-00-866-002).
(5) Put the 98D27604000000 COLLAR-SAFETY, SPOILER or 98D27604004000 COLLAR SAFETY SPOILER on the piston rod of the servo-control.

Subtask 29-12-37-865-051-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
49VU	FLIGHT CONTROLS/SEC1/NORM/SPLY	21CE1	B08
49VU	FLIGHT CONTROLS/FLP/CTL AND MONG/SYS1	6CV	B07
** ON A/C ALL
49VU	HYD/HYD PWR/B WARN/& CTL	2702GJ	C12
** ON A/C NOT FOR ALL
49VU	FLIGHT CONTROLS/SEC1/NORM/SPLY	21CE1	B03
49VU	FLIGHT CONTROLS/FLP/CTL AND MONG/SYS1	6CV	B02
** ON A/C ALL
105VU	FLT CTL/SEC1/STBY SPLY	22CE	B01
121VU	FLIGHT CONTROLS/WTB/FLP/SYS2	12CV	P20
121VU	FLIGHT CONTROLS/FLP/CTL AND/MONG/SYS2	8CV	Q21
121VU	FLIGHT CONTROLS/SEC3/SPLY	21CE3	Q19
121VU	FLIGHT CONTROLS/SEC2/SPLY	21CE2	Q18
122VU	FLIGHT CONTROLS/WTB/FLP/SYS1	10CV	S07
123VU	B HYD/ELEC PUMP	2701GJ	AB09

Subtask 29-12-37-864-051-A

D. Depressurize the Applicable Hydraulic System
(1) Depressurize the Blue hydraulic system (Ref. AMM TASK 29-10-00-864-003).
(2) Depressurize the Blue hydraulic-system reservoir (Ref. AMM TASK 29-14-00-614-001).

Subtask 29-12-37-010-051-A

E. Get Access
(1) Put an ACCESS PLATFORM 4M (13 FT) below the applicable access panel.
(2) Remove the applicable access panel:
(a) FOR [2170GM] (CHECK VALVE-FLAP WTB B RETURN, L WING)
remove 575DB (Ref. AMM TASK 57-51-37-000-004)
(b) FOR [2405GM] (CHECK VALVE-FLAP WTB B RETURN, R WING)
remove 675DB (Ref. AMM TASK 57-51-37-000-004).
(3) Put a CONTAINER 5 L (1.32 USGAL) below the applicable check valve.

4. Procedure
Subtask 29-12-37-020-052-B

A. Removal of the Check Valve

WARNING: DO NOT GET THE FLUID ON YOUR SKIN OR IN YOUR EYES. IF YOU DO:

FLUSH IT AWAY WITH CLEAN WATER
GET MEDICAL AID.

CAUTION: MAKE SURE THAT THE FLUID DOES NOT STAY ON THE AIRCRAFT STRUCTURE. IF THE FLUID GETS ON THE AIRCRAFT STRUCTURE, WASH IT OFF IMMEDIATELY WITH SOAP AND WATER.

(1) FOR [2170GM] (CHECK VALVE-FLAP WTB B RETURN, L WING)
(a) Disconnect the coupling nuts (3) and (5) and remove the pipe (4).
(b) Remove the check valve (2) from the coupling nut (1).
(2) FOR [2405GM] (CHECK VALVE-FLAP WTB B RETURN, R WING)
(a) Cut, remove and discard the tie-wrap (6) then remove the support plug (7).
(b) Remove the nuts (8), the spring washers (9), the sleeves (10), the bolts (12) and the clamp (11).
(c) Disconnect the coupling nuts (3) and (5) and remove the pipe (4).
(d) Remove the check valve (2) from the coupling nut (1).
(e) For 2170GM and 2405GM:
1 Put the PLUG-BLANKING in each disconnected line end.
2 Remove the CONTAINER 5 L (1.32 USGAL) and correctly dispose of the hydraulic fluid.

[Rev.10 from 2021] 2026.04.01 00:19:18 UTC