Manually Operate the Transfer System Discharge Check Valve on RIB1 and Check For Full and Free Movement

TASK 28-26-00-210-001-A
Manually Operate the Transfer System Discharge Check Valve on RIB1 and Check For Full and Free Movement

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.

ZONE: 540
ZONE: 640

1. Reason for the Job
Refer to the MPD TASK: 282600-01
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE
No specific	AR	SAFETY BARRIER(S)
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
98D57004014000	2	HOOK-COVER (RIB2-SURGE DOORS)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
540	FUEL TANK
640	FUEL TANK
540AB, 540BZ, 640AB, 640BZ

C. Referenced Information

REFERENCE	DESIGNATION
TASK 12-11-28-650-003-A	Pressure Refuel with Automatic Control
TASK 28-00-00-000-001-A	Removal of the Fuel Pipes
TASK 28-00-00-400-001-A	Installation of the Fuel Pipes
TASK 28-10-00-910-001-A	Safety Procedures When You Do Work in a Fuel Tank
TASK 28-10-00-910-002-A	Access to the Fuel Tanks and the Work Areas
TASK 28-25-00-650-001-A	Pressure Defuel
TASK 28-25-00-650-003-A	To Drain Remaining Fuel from the Wing Tanks and the Center Tank
TASK 28-25-00-650-003-A-01	To Drain Remaining Fuel from the Wing Tanks and the Center Tank
TASK 28-25-00-869-001-A	Fuel Transfer
TASK 28-42-15-000-005-A	Removal of the Wing Tank Fuel-Quantity Probes
TASK 28-42-15-400-005-A	Installation of the Fuel-Quantity-Probes
TASK 57-27-11-000-001-A	Removal of the Access Panel
TASK 57-27-11-400-001-A	Installation of the Access Panel
TASK 28-26-44-000-001-A	Removal of the Main-Transfer-System Clack Valve (for corrective action)
TASK 28-26-44-400-001-A	Installation of the Main-Transfer-System Clack Valve (for corrective action)
Transfer System Discharge Check Valve - Location and Detail

3. Job Set-up
Subtask 28-26-00-941-050-A ** ON A/C NOT FOR ALL

A. Safety Precautions

WARNING: OBEY THE SAFETY PROCEDURES WHEN YOU DO WORK IN A FUEL TANK.

(1) You must obey the fuel safety procedures (Ref. AMM TASK 28-10-00-910-001) when you do work in a fuel tank.
(2) Put the SAFETY BARRIER(S) in position.

Subtask 28-26-00-650-052-A ** ON A/C NOT FOR ALL

B. Fuel Configuration
(1) Defuel the applicable wing tank and the center tank (Ref. AMM TASK 28-25-00-650-001).
(2) Drain the remaining fuel from the applicable wing tank (Ref. AMM TASK 28-25-00-650-003).

Subtask 28-26-00-865-051-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	FUEL/L WING TK/PUMP2 SPLY	7QA	N26
121VU	FUEL/L WING TK/PUMP1 SPLY	1QA	N23
121VU	FUEL/R WING TK/PUMP2 SPLY	8QA	Q26
121VU	FUEL/R WING TK/PUMP1 SPLY	2QA	Q23
121VU	FUEL/CTR TK/L&R XFR/CTL & IND	2QL	R26
121VU	FUEL/CTR TK/L&R XFR/CTL & IND	1QL	R25
123VU	L WING TK/PUMP 1/STBY SPLY	11QA	AD12
123VU	R WING TK/PUMP 1/STBY SPLY	12QA	AE12

Subtask 28-26-00-010-050-A ** ON A/C NOT FOR ALL

D. Get Access
(1) Put an ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE below the applicable access panel 540AB(640AB).
(2) Remove the applicable access panels 540AB 640AB (Ref. AMM TASK 28-10-00-910-002), (Ref. AMM TASK 57-27-11-000-001).
(3) Safety open the applicable spring-loaded surge-door 540BZ 640BZ with the 98D57004014000 HOOK-COVER (RIB2-SURGE DOORS).
(4) If necessary, remove the applicable Fuel Quantity Indicating (FQI) probe 54QT1(54QT2) (Ref. AMM TASK 28-42-15-000-005):
(5) Remove the fuel pipes, as necessary, to get access to the applicable discharge check valve (Ref. AMM TASK 28-00-00-000-001).

4. Procedure
Subtask 28-26-00-210-050-A ** ON A/C NOT FOR ALL

A. Inspection of the Transfer-System Discharge-Check-Valve
(1) Manually operate the transfer-system discharge-check-valve. Make sure that the check valve moves fully and freely.
(2) If necessary, replace the transfer-system discharge-check-valve (Ref. AMM TASK 28-26-44-000-001) and (Ref. AMM TASK 28-26-44-400-001).

5. Close-up
Subtask 28-26-00-410-050-A ** ON A/C NOT FOR ALL

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Install the fuel pipes that you removed (Ref. AMM TASK 28-00-00-400-001).
(3) If necessary, install the applicable FQI probe 54QT1(54QT2) (Ref. AMM TASK 28-42-15-400-005):
(4) Remove the 98D57004014000 HOOK-COVER (RIB2-SURGE DOORS) and carefully close the applicable spring-loaded surge-door 540BZ 640BZ.
(5) Install the applicable access panels 540AB 640AB (Ref. AMM TASK 28-10-00-910-002), (Ref. AMM TASK 57-27-11-400-001).

Subtask 28-26-00-865-052-A ** ON A/C NOT FOR ALL

B. 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	FUEL/L WING TK/PUMP2 SPLY	7QA	N26
121VU	FUEL/L WING TK/PUMP1 SPLY	1QA	N23
121VU	FUEL/R WING TK/PUMP2 SPLY	8QA	Q26
121VU	FUEL/R WING TK/PUMP1 SPLY	2QA	Q23
121VU	FUEL/CTR TK/L&R XFR/CTL & IND	2QL	R26
121VU	FUEL/CTR TK/L&R XFR/CTL & IND	1QL	R25
123VU	L WING TK/PUMP 1/STBY SPLY	11QA	AD12
123VU	R WING TK/PUMP 1/STBY SPLY	12QA	AE12

Subtask 28-26-00-650-053-A ** ON A/C NOT FOR ALL

C. Fuel Configuration
(1) Refuel, defuel or transfer fuel as necessary (Ref. AMM TASK 12-11-28-650-003), (Ref. AMM TASK 28-25-00-650-001) or (Ref. AMM TASK 28-25-00-869-001).

Subtask 28-26-00-942-051-A ** ON A/C NOT FOR ALL

D. Removal of Equipment
(1) Remove the safety barriers.
(2) Remove the WARNING NOTICE(S).
(3) Remove the access platform(s).
(4) Remove the ground support and maintenance equipment, the special and standard tools and all other items.

[Rev.8 from Aug 2017] 2026.04.02 06:17:45 UTC