(d) Do the test given in Para. 3.A.

 **ON A/C 301-399,
 A. If the RIGHT HI LVL Indicator light fails to change state, from off to on, or from on to off:
 - swap the FLSCU-2 (9QJ) with FLSCU-1 (7QJ), (Ref. AMM TASK 28-46-34-000-001), and (Ref. AMM TASK 28-46-34-400-001).
 (1) Do the test 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 : ALL ∞∞28-46-00∞∞∞∞∞∞∞∞∞∞Page A269
 May 01/05R CES

 (2) If the RIGHT HI LVL Indicator light changes state during the test but the fault has transfered to LEFT HI LVL Indicator light:

 - replace the FLSCU-1 (7QJ), (Ref. AMM TASK 28-46-34-000-001), and (Ref. AMM TASK 28-46-34-400-001).

 (3) Do the test given in Para. 3.A.

 (4) If the fault continues:

 (5) Remove Panel Assy-Refuel (800VU) (Ref. AMM TASK 28-25-55-000-001).

 (6) Do a check (Ref. AWM 28-46-02) with a multimeter of the SW-TEST/HI/LTS (2QJ) between:

 - connector 4023VC, pin <C, and connector 4024VC, pin R, on the Panel

 Assy-Refuel (800VU). The multimeter must show: - open circuit for the switch in the central (released) position

 - closed circuit for the switch in the TEST position.

 NOTE : The LTS test checks the 28VDC supply to the Panel Assy-Refuel
____
 (800VU).

 (7) Replace the Panel Assy-Refuel (800VU), if it fails Step (6), (Ref. AMM TASK 28-25-55-000-001), and (Ref. AMM TASK 28-25-55-400-001).
 NOTE : If due to airline operational conditions it is not possible to
____ replace the Panel Assy-Refuel (800VU) and internal Trouble-shooting is required, go to Step (12).
 (8) If the fault continues do a wiring check (Ref. AWM 28-46-01), and (Ref. AWM 28-46-02) of the aircraft wiring:

 - between the Panel Assy-Refuel (800VU), connector 4024VC, pin R and the FLSCU-2 rack connector AA, pin 13B

 - between the Panel Assy-Refuel (800VU), connector 4024VC, pin S and the FLSCU-2 rack connector AA, pin 7A

 - between the FLSCU-2 rack connector AA, pin 6A and the DC ground/earth point

 - between the FLSCU-2 rack connector AB, pin 10A and the tank wall connector 4039VC, pin <V

 - between the FLSCU-2 rack connector AB, pin 10B and the tank wall connector 4039VC, pin EE.

 (9) Repair all the unserviceable wiring and connectors.

 (10) Do the test given in Para. 3.A.

 (11) If the fault continues:

 (a) Drain, open and vent the tank (Ref. AMM TASK 28-10-00-910-001).

 (b) Do a check of the TANK HARNESS INNER A (58QT), (Ref. AWM 28-46-02).

 「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 : 301-399, ∞∞28-46-00∞∞∞∞∞∞∞∞∞∞Page A270
 May 01/05 CES

 (c) If the harness is unserviceable:

 - replace the harness (Ref. AMM TASK 28-42-43-000-005) and (Ref. AMM TASK 28-42-43-400-005).

 (d) If the harness is serviceable:

 - replace the SENSOR-HI LEVEL, RIGHT WING TANK INNER CHANNEL A (17QJ2) (Ref. AMM TASK 28-46-15-000-001) and (Ref. AMM TASK 28-46-15-400-009).
 (12) Panel Assy-Refuel (800VU) Internal Trouble-shooting (Ref. AWM 28-46-01) and (Ref. AWM 28-46-02):
 (a) Check/replace the SWITCH-TEST/HIGH/LTS (2QJ) (part of 800VU).

 (b) Check/repair the Panel Assy-Refuel (800VU) internal wiring as follows:

 - connector 4023VC, pin <C to terminal block 4001VT, terminal 5C

 - terminal block 4001VT, terminal 5J to SW-TEST/HI/LTS (2QJ), terminal 1B

 - SW-TEST/HI/LTS (2QJ), terminal 3B to connector 4024VC, pin R

 - connector 4024VC, pin S to IND-HI LVL/RIGHT (4QJ), terminal I.

 (c) Install the Panel Assy-Refuel (800VU) (Ref. AMM TASK 28-25-55-400-001).

 (d) Do the test given in Para. 3.A.

 「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1R EFF : 301-399, ∞∞28-46-00∞∞∞∞∞∞∞∞∞∞Page A271
 May 01/05 CES

 **ON A/C ALL

 TASK 28-46-00-810-825
 CTR HI LVL Manual TEST
 WARNING : OBEY THE FUEL SAFETY PROCEDURES.
_______
 1. Possible Causes
_______________
 - FLSCU-1 (7QJ)

 - CTL PNL-REFUEL/DEFUEL (800VU)

 - HARNESS-CHAN A, CTR TK (17QT)

 - SENSOR-HIGH LEVEL, CENTER TANK (20QJ)

 - SW-TEST/LTS/HIGH (2QJ)
　
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