Intercell XFR System - Left Valve Shows in Transit, CFDS (FUEL) Reports L/FWD Valve

TASK 28-15-00-810-818-A
Intercell XFR System - Left Valve Shows in Transit, CFDS (FUEL) Reports L/FWD Valve

WARNING: OBEY THE FUEL SAFETY PROCEDURES.

WARNING: WHEN YOU DO WORK ON THE FUEL SYSTEM WIRING, YOU MUST USE TEST EQUIPMENT THAT IS APPROVED (REFER TO INTERNATIONAL OR NATIONAL SPECIFICATIONS FOR INTRINSICALLY SAFE TEST EQUIPMENT: EN50020, UL913 OR EQUIVALENT). TEST EQUIPMENT THAT IS NOT APPROVED CAN CAUSE FIRE OR AN EXPLOSION.

1. Possible Causes

ACTUATOR-TRANSFER VALVE, L FWD SPAR [9QP]
aircraft wiring
RELAY-L WING TK LOW LEVEL CHANNEL B (7QP) 103VU
RELAY-R WING TK LOW LEVEL CHANNEL A (8QP) 103VU

2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	MULTIMETER - STANDARD

B. Referenced Information

REFERENCE	DESIGNATION
AMM 28-15-00-710-002	Operational Check of Individual Transfer Valves to Ensure Valve Shaft Rotates Valve to Open Position
ASM 281502
AMM 28-15-51-000-001	Removal of the Actuator
AMM 28-15-51-400-001	Installation of the Actuator

3. Fault Confirmation
Subtask 28-15-00-710-067-A ** ON A/C NOT FOR ALL

A. Do the Operational Test of the Intercell Transfer Valves AMM 28-15-00-710-002.

NOTE: The intercell transfer valves (ICTVs) are motor driven and the power for these circuits is derived from the main power. The ICTVs are immobilized on battery power.

4. Fault Isolation
Subtask 28-15-00-810-067-A ** ON A/C NOT FOR ALL

A. If the Left Intercell Transfer Valve continues to be shown in transit on the FUEL System Display, and the CFDS(FUEL) reports the Left Forward Valve, disconnect the electrical connector from the ACTUATOR-TRANSFER VALVE, L FWD SPAR (9QP).

NOTE: During normal Actuator-Transfer Valve, Left Forward Spar (9QP) operation, 28VDC is supplied to the electrical connector:

on the pin A for OPEN
on the pin B for SHUT.

(1) Check with a MULTIMETER - STANDARD, at the electrical supply cable connector ASM 281502 to see if:

28VDC is at pin B
0VDC is at pin A.

(2) Open the C/B-FUEL/XFR VALVE 2/WING/R (4QP), M23 at 121VU.
(3) Check with a multimeter, at the electrical supply cable connector ASM 281502 to see if:

28VDC is at pin A
0VDC is at pin B.

(4) Close the C/B-FUEL/XFR VALVE 2/WING/R (4QP), M23 at 121VU.
(5) If the voltages at pins A and B of the connector are correct, (as in (1) and (3) above), check/replace the ACTUATOR-TRANSFER VALVE, L FWD SPAR [9QP] , AMM 28-15-51-000-001, and AMM 28-15-51-400-001.
(a) While the actuator is removed from the aircraft confirm that the transfer valve drive shaft and valve are free to rotate.
(b) Repair/replace any unserviceable items found in (a).
(6) If no 28VDC is measured at either pins A and B of the electrical supply cable connector, (as in (1) and (3) above).
(a) Check with a multimeter to see if 28VDC is available at:

terminal A2, RELAY-L WING TK LOW LEVEL CHANNEL B (7QP)
terminal X1, RELAY-L WING TK LOW LEVEL CHANNEL B (7QP).

(b) If the 28VDC is not available do a wiring check ASM 281502 of the aircraft wiring between the RELAY-L WING TK LOW LEVEL CHANNEL B (7QP) and the C/B-FUEL/XFR VALVE 2/WING/L (3QP).
(c) Repair all the unserviceable wiring and connectors.
(d) Check with a multimeter to see if 28VDC is available at:

terminal A2, RELAY-R WING TK LOW LEVEL CHANNEL A (8QP)
terminal X1, RELAY-R WING TK LOW LEVEL CHANNEL A (8QP).

(e) If the 28VDC is not available do a wiring check ASM 281502 of the aircraft wiring between the RELAY-R WING TK LOW LEVEL CHANNEL A (8QP) and the C/B-FUEL/XFR VALVE 2/WING/R (4QP).
(f) Repair all the unserviceable wiring and connectors.
(7) Do the test given in Para 3.A.
(8) If the fault continues, check/replace the RELAY-L WING TK LOW LEVEL CHANNEL B (7QP) 103VU.
(9) Do the test given in Para 3.A.
(10) If the fault continues check/replace the RELAY-R WING TK LOW LEVEL CHANNEL A (8QP) 103VU.
(11) Do the test given in Para 3.A.
(12) If the fault continues do a wiring check ASM 281502 of the aircraft wiring:

between the pin A, ACTUATOR-TRANSFER VALVE, L FWD SPAR (9QP) and the terminal A3, RELAY-L WING TK LOW LEVEL CHANNEL B (7QP)
between the pin A, ACTUATOR-TRANSFER VALVE, L FWD SPAR (9QP) and the terminal B3, RELAY-R WING TK LOW LEVEL CHANNEL A (8QP)
between the terminal A1, RELAY-L WING TK LOW LEVEL CHANNEL B (7QP) and the terminal B2, RELAY-R WING TK LOW LEVEL CHANNEL A (8QP)
between the pin B, ACTUATOR-TRANSFER VALVE, L FWD SPAR (9QP) and the terminalB1, RELAY-R WING TK LOW LEVEL CHANNEL A (8QP).

(13) Repair all the unserviceable wiring and connectors.
(14) Do the test given in Para 3.A.

[Rev.8 from Aug 2018] 2026.04.04 04:28:31 UTC