(2)
Put the safety barriers in position.
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B. Aircraft Maintenance Configuration WARNING : MAKE SURE THAT ALL THE CIRCUITS IN MAINTENANCE ARE ISOLATED
_______ BEFORE YOU SUPPLY ELECTRICAL POWER TO THE AIRCRAFT.
(1)
Energize the aircraft electrical circuits (Ref. TASK 24-41-00-861-002).
(2)
Refuel (Ref. TASK 12-11-28-650-003), defuel (Ref. TASK 28-25-00-650-001) or transfer fuel (Ref. TASK 28-25-00-869-001) as necessary so that
-
the center tank is empty
-
the left wing tank inner-cell contains a minimum 750 kg (1700 lb).
(3)
Drain the remaining fuel from the center tank (Ref. TASK 28-25-00-650-003).
4. Procedure
_________
(Ref. Fig. 506/TASK 28-21-00-991-007) Subtask 28-21-00-720-063
A. Functional Test of the Center-Tank Pump-Canister Check-Valves
NOTE : This test is for 84QM. For 85QM use the indications in
____
parenthesis.
(1)
Put a container below the center tank fuel-pump 37QA(38QA).
(2)
Remove the drain plug (2) from the center tank fuel-pump 37QA(38QA). Let the fuel drain from the center tank fuel pump 37QA(38QA).
(3)
Install the drain plug (2) in the center tank fuel-pump 37QA(38QA).
(4)
Remove the container from below the center tank fuel-pump 37QA(38QA).
(5)
On the panel 40VU, push in the L (R) TK PUMPS 1 and 2 push button switches (P/BSWs).
(6)
Let the wing tank pumps operate for 5 minutes.
(7)
On the panel 40VU, release out the L (R) TK PUMPS 1 and 2 P/BSWs.
(8)
Put an empty container below the center tank fuel-pump 37QA(38QA).
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Center-Tank Fuel-Pump Drain Plug - Location and Detail
Figure 506/TASK 28-21-00-991-007
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(9) Remove the drain plug (2) and the O-ring (1) from the center tank fuel-pump 37QA (38QA). Let the fuel drain from the center tank fuel pump 37QA(38QA).
(10)
Measure the quantity of fuel removed from the center tank fuel-pump 37QA(38QA). The amount of fuel drained from the center tank fuel-pump 37QA(38QA) must not be more than 0.25 l (0.07 USgal).
(11)
Lubricate the new sealing ring (1) with FUELS (Material No. 01-001) or COMMON GREASE (Material No. 04-012).
(12)
Install the sealing ring (1) and the drain plug (2).
(13)
Safety the drain plug (2) with MISCELLANEOUS (Material No. 19-010).
(14)
Refuel (Ref. TASK 12-11-28-650-003) or transfer fuel (Ref. TASK 28-25-00-869-001) as necessary so that the right wing tank inner-cell contains a minimum 750 kg (1700 lb).
(15)
Repeat this test procedure for the right center tank fuel-pump.
5. Close-up
________ Subtask 28-21-00-860-085
A. Aircraft 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).
(2)
De-energize the aircraft electrical circuits (Ref. TASK 24-41-00-862-002).
Subtask 28-21-00-942-082
B. Removal of Equipment
(1)
Make sure that the work area is clean and clear of tool(s) and other items.
(2)
Remove the safety barriers.
(3)
Remove the ground support and maintenance equipment, the special and standard tools and all other items.
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TASK 28-21-00-710-011
Operational Leak Test of the Air Release Valve Float
WARNING : PUT THE SAFETY DEVICES AND THE WARNING NOTICES IN POSITION BEFORE YOU
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