- is not held open by a loose object, damage, corrosion or biological growth.

 1 If necessary, remove the loose (foreign) object and find out
_
 where it came from.

 (b) Make sure that the items that follow are serviceable. If necessary, replace them (Ref. AMM TASK 28-26-44-000-001) and (Ref. AMM TASK 28-26-44-400-001):
 1 The Left (Right) Main Transfer System Clack (moveable flap)
_
 Valve.

 2 The clack valve seat.
_

 3 The shroud.
_

 (2) Replace the JET PUMP-L, CENTER TANK (157QM) (JET PUMP-R, CENTER TANK (158QM) (Ref. AMM TASK 28-26-41-000-001) and (Ref. AMM TASK 28-26-41-400-001).
 NOTE : This step is necessary because the jet pump contains a
____ Non-Return Valve (NRV) flapper assembly in the secondary inlet. This NRV is in series with the transfer system clack valve. The two valves must be in the open (failed) position to give this unwanted fuel transfer.
 No jet pump NRV maintenance parts are defined in the IPC.
 (3) Do a leak test of the applicable wing tank Rib 1 (Ref. AMM TASK 28-11-00-790-008) and (Ref. AMM TASK 28-11-00-280-002). Repair, if necessary.

 (4) If the unwanted transfer is between the:

 (a) Right wing tank and the center tank, go to step (5).

 (b) Left wing tank and the center tank, do Fuel - Unwanted Transfer From The Left Wing Tank To The Center Tank At Any Time (Ref. TASK 28-12-00-810-801).

 「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 : 301-399, ∞∞28-26-00∞∞∞∞∞∞∞∞∞∞Page 237
 Aug 01/05 CES

 NOTE : This step (cross reference) is not applicable to an
____ unwanted fuel transfer from the right wing tank to the center tank.
 (5) Do the tests given in Para. 3.A.
 「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 : 301-399, ∞∞28-26-00∞∞∞∞∞∞∞∞∞∞Page 238
 Aug 01/05 CES

 MAIN TRANSFER SYSTEM - TASK SUPPORTING DATA

___________________________________________
 1. General
_______
 The diagrams that follow are to help you do the trouble-shooting tasks.

 For the Main Transfer (Center Tank to Wing Tanks) System:
 - Physical Layout see
 (Ref. Fig. 301)

 - Block Diagram and Basic Control Logic see
 (Ref. Fig. 302)

 - Auto Control Logic see
 (Ref. Fig. 303)

 - Engine Feed Interface see
 (Ref. Fig. 304)

 「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 : 301-399, ∞∞28-26-00∞∞∞∞∞∞∞∞∞∞Page 301
 May 01/04 CES

 Main Transfer System - Physical Layout Figure 301 (SHEET 1)
 「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 : 301-399, ∞∞28-26-00∞∞∞∞∞∞∞∞∞∞Page 302
 May 01/04 CES

 Main Transfer System - Physical Layout Figure 301 (SHEET 2)
 「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 : 301-399, ∞∞28-26-00∞∞∞∞∞∞∞∞∞∞Page 303
 May 01/04 CES

 Main Transfer System - Block Diagram and Basic Control Logic
 Figure 302

 「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 : 301-399, ∞∞28-26-00∞∞∞∞∞∞∞∞∞∞Page 304
 May 01/04 CES

 Main Transfer System - Auto Control Logic
 Figure 303

 「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 : 301-399, ∞∞28-26-00∞∞∞∞∞∞∞∞∞∞Page 305
 May 01/04 CES

 Main Transfer System - Engine Feed Interface
 Figure 304

 「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 : 301-399, ∞∞28-26-00∞∞∞∞∞∞∞∞∞∞Page 306
 May 01/04 CES 2. Maintenance Notices

___________________ The maintence notices that follow are to give you an introduction or understanding of possible reported problems associated with the Main Transfer System.
　
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