(Ref. Fig. 601/TASK 28-26-00-991-002) Subtask 28-26-00-941-050
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. TASK 28-10-00-910-001) when you do work in a fuel tank.
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Transfer System Discharge Check Valve - Location and Detail
Figure 601/TASK 28-26-00-991-002
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(2) Put the safety barriers in position.
Subtask 28-26-00-650-052
B. Fuel Configuration
(1)
Defuel the applicable wing tank and the center tank (Ref. TASK 28-25-00-650-001).
(2)
Drain the remaining fuel from the applicable wing tank (Ref. TASK 28-25-00-650-003).
Subtask 28-26-00-865-051
C. Open, safety and tag this(these) circuit breaker(s):
-------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------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
D. Get Access
(1)
Put an adjustable access platform below the applicable access panel 540AB(640AB).
(2)
Remove the applicable access panels 540AB, 640AB (Ref. TASK 28-10-00-910-002), (Ref. TASK 57-27-11-000-001).
(3)
Safety open the applicable spring-loaded surge-door 540BZ, 640BZ with the HOOK-COVER (RIB2-SURGE DOORS) (98D57004014000).
(4)
If necessary, remove the applicable Fuel Quantity Indicating (FQI) probe 54QT1(54QT2) (Ref. TASK 28-42-15-000-005):
(5)
Remove the fuel pipes, as necessary, to get access to the applicable discharge check valve (Ref. TASK 28-00-00-000-001).
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4. Procedure
_________ (Ref. Fig. 601/TASK 28-26-00-991-002) Subtask 28-26-00-210-050
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. TASK 28-26-44-000-001) and (Ref. TASK 28-26-44-400-001).
5. Close-up
________ Subtask 28-26-00-410-050
A. Close Access
(1)
Make sure that the work area is clean and clear of tool(s) and other items.
(2)
Install the fuel pipes that you removed (Ref. TASK 28-00-00-400-001).
(3)
If necessary, install the applicable FQI probe 54QT1(54QT2) (Ref. TASK 28-42-15-400-005):
(4)
Remove the HOOK-COVER (RIB2-SURGE DOORS) (98D57004014000) and carefully close the applicable spring-loaded surge-door 540BZ, 640BZ.
(5)
Install the applicable access panels 540AB, 640AB (Ref. TASK 28-10-00-910-002), (Ref. TASK 57-27-11-400-001).
Subtask 28-26-00-865-052
B. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s): 1QA, 2QA, 7QA, 8QA, 11QA, 12QA, 1QL, 2QL.
Subtask 28-26-00-650-053
C. Fuel Configuration
(1) Refuel, defuel or transfer fuel as necessary (Ref. TASK 12-11-28-650-003), (Ref. TASK 28-25-00-650-001) or (Ref. TASK 28-25-00-869-001).
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D. Removal of Equipment
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