R 2_ Does not change when a fuel-pump is tested, do Para. 4.A. forR the applicable fuel-pump(s).
「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1 EFF : ALL ∞∞28-21-00∞∞∞∞∞∞∞∞∞∞Page B236
May 01/04 CES
(2) If, during the procedure in Para. 4.A. you have been told to do the test given in Para. 3.A. after a pump canister check valve replacement, do the procedure that follows:
- Operational Check of the Wing Tank Pump-Canister Check-Valves (Ref. AMM TASK 28-21-00-710-012).
NOTE : This test is necessary to make sure that the fuel pump
____ canister check valve stays closed in the check/reverse flow direction. The fuel pump canister check valve stops the possible migration of fuel between fuel tanks and is one feature that lets you remove a fuel pump with out defuelling the applicable fuel tank.
**ON A/C ALL
4. Fault Isolation
_______________
R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 401-499,
A. Procedure
(1) Remove the applicable fuel pump from the:
- wing tank (Ref. AMM TASK 28-21-51-000-001)
- center tank (Ref. AMM TASK 28-21-51-000-002).
(2) If, during the removal of the fuel pump:
(a) Approximately 0.5 l (0.2 USgal) of fuel flows from the fuel pump drain, do step (3).
(b) More than approximately 0.5 l (0.2 USgal) of fuel, or fuel continues to flow from the fuel pump drain:
1 Re-install the drain plug/bolt.
_
2 Do step (4).
_
(3) Remove the check valve from the fuel pump canister (Ref. AMM TASK 28-21-52-000-004).
(a) Do a check of the check valve, to see if it can open, as follows:
1 Push the valve in (away from the valve seat). Make sure that
_ the valve has a full and free movement.
2 If the fuel-pump canister check-valve does not have a full and
_ free movement, replace it with a serviceable item.
(b) Install the check valve in the fuel pump canister (Ref. AMM TASK 28-21-52-400-004).
「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1 EFF : ALL ∞∞28-21-00∞∞∞∞∞∞∞∞∞∞Page B237
Aug 01/05 CES
(c) Install the fuel pump in the:
- wing tank (Ref. AMM TASK 28-21-51-400-001)
- center tank (Ref. AMM TASK 28-21-51-400-002).
(d) Do the test given in Para. 3.A.
(4) If the fault continues:
(a) Do the procedure for the Leak Test of the Main-Pump-System Pipe-Lines (Ref. AMM TASK 28-21-00-790-001). Use the wing tank fuel pumps on the opposite wing to generate a fuel pressure to test the applicable engine feed pipe lines.
(b) If no leak is found, no more trouble shooting steps are
necessary.
(c) If a leak is found in the center tank, do step (d). If a leak is found in the wing tank:
1 Get access to the applicable wing tank collector cell (Ref.
_
AMM TASK 28-21-52-000-001).
2 Examine the items that follow (to see/find out what can cause
_ the leak) for damage, incorrect assembly or installation:
a The applicable fuel pump canister.
_ Replace, if necessary (Ref. AMM TASK 28-21-52-000-001) / (Ref. AMM TASK 28-21-52-000-002) and (Ref. AMM TASK 28-21-52-400-001) / (Ref. AMM TASK 28-21-52-400-002).
b The related sequence valve.
_ Replace, if necessary, (Ref. AMM TASK 28-21-45-000-001) and (Ref. AMM TASK 28-21-45-400-003).
c The adjacent main-pump-system pipe-lines.
_ Replace, if necessary all the unserviceable pipe sections and connections (Ref. AMM TASK 28-00-00-000-001) and (Ref. AMM TASK 28-00-00-400-001).
d The related suction valve (Ref. AMM TASK 28-21-00-280-001).
_ Replace, if necessary (Ref. AMM TASK 28-21-42-000-001) and (Ref. AMM TASK 28-21-42-400-001).
3 Get access to the related wing tank inner cell (Ref. AMM TASK
_
28-21-52-000-001).
4 Examine the engine fuel supply pipe-line, between the Rib 2
_ and the exit point to the engine pylon at the forward spar, for damage, incorrect assembly or installation.
「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1R EFF : 001-049, 051-099, 101-149, 151-199, ∞∞28-21-00∞∞∞∞∞∞∞∞∞∞Page B238
201-299, 401-499, Aug 01/05 CES
5 Replace all the unserviceable pipe sections and connections
_ (Ref. AMM TASK 28-00-00-000-001) and (Ref. AMM TASK 28-00-00-400-001).
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