Refueling not Possible

TASK 24-67-00-810-801-A
Refueling not Possible

1. Possible Causes

RELAY - REFLNG NORM/BAT (5PR)
RELAY - REFLNG BUS 501PP CTL (8PR)
CNTOR-DC SVCE BUS GND SPLY [3PX]
CNTOR-DC SVCE BUS NORM SPLY [8PN]
CTL PNL-REFUEL/DEFUEL [800VU]
wiring
C/B-ELEC/REFLNG/ON/BAT [1PR]
C/B-ELEC/RFL/SPLY/LOGIC [4PR]

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
TSM TASK 24-00-00-810-803-A	Circuit Breaker Tripped and/or C/B TRIPPED Warning
AMM 24-41-00-861-002	Energize the Aircraft Electrical Circuits from the External Power
AMM 24-41-00-862-002	De-energize the Aircraft Electrical Circuits Supplied from the External Power
AMM 24-43-55-000-001	Removal of the DC Service Bus Ground Supply Contactor
AMM 24-43-55-400-001	Installation of the DC Service Bus Ground Supply Contactor
AMM 24-61-55-000-001	Removal of the DC Service Bus Normal Supply Contactor
AMM 24-61-55-400-001	Installation of the DC Service Bus Normal Supply Contactor
ASM 246701
AMM 28-25-55-000-001	Removal of the Refuel Panel
AMM 28-25-55-400-001	Installation of the Refuel Panel

3. Fault Confirmation
Subtask 24-67-00-860-050-A

A. Job Set-up
(1) Aircraft Maintenance Configuration
(a) Energize the aircraft electrical circuits
AMM 24-41-00-861-002.

Subtask 24-67-00-700-050-A

B. Test
No applicable, the fault is evident.

4. Fault Isolation
Subtask 24-67-00-865-050-A

A. Table of the circuit breakers used in this procedure:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
122VU	ELEC/RFL/SPLY/LOGIC	4PR	U29
122VU	ELEC/REFLNG/ON/BAT	1PR	U28

Subtask 24-67-00-810-050-A

B. If the refueling is not possible:

Do a check of the battery 1 voltage.

(1) If the voltage is correct:

Do a check of the status of the circuit breakers (1PR) and (4PR).

(a) If the circuit breakers are closed:

Replace the RELAY - REFLNG NORM/BAT (5PR) and RELAY - REFLNG BUS 501PP CTL (8PR).

1 If the fault continues:

Replace the CNTOR-DC SVCE BUS GND SPLY [3PX] AMM 24-43-55-000-001 and AMM 24-43-55-400-001.

2 If the fault continues:

Replace the CNTOR-DC SVCE BUS NORM SPLY [8PN] AMM 24-61-55-000-001 and AMM 24-61-55-400-001.

3 If the fault continues:

Replace the CTL PNL-REFUEL/DEFUEL [800VU] AMM 28-25-55-000-001 and AMM 28-25-55-400-001.

4 If the fault continues:

Do a check and repair the wiring between respectively:
. the circuit breaker (1PR) and the pin A/C1 of the relay (5PR)
. the circuit breaker (4PR) and the pins A/X1 and A/A1 of the relay (5PR)
. the pin A/X2 of the relay (5PR) and the ground, through the contactors (3PX and 8PN), the switch (10PR) or the relay (11PR), and the microswitch (20QU)
. the pin A/C2 of the relay (5PR) and the pins A/A1, A/C1 and A/X1 of the relay (8PR)
. the pin A/A2 of the relay (8PR) and the terminal block
. the pin A/C2 of the relay (8PR) and the terminal block
. the pin A/X2 of the relay (8PR) and the ground ASM 246701.

(b) If the circuit breaker (1PR) is open:

Do the procedure (Ref. TSM TASK 24-00-00-810-803).

1 If the fault continues:

Replace the C/B-ELEC/REFLNG/ON/BAT [1PR] .

Do the procedure (Ref. TSM TASK 24-00-00-810-803).

1 If the fault continues:

Replace the C/B-ELEC/RFL/SPLY/LOGIC [4PR] .

Subtask 24-67-00-710-050-A

C. Do this test.
(1) Energize the aircraft electrical circuits
AMM 24-41-00-861-002.
(2) Do a refueling to make sure that the fault does not continue.

5. Close-up
Subtask 24-67-00-860-051-A

A. Put the aircraft back to its initial configuration.
(1) De-energize the aircraft electrical circuits
AMM 24-41-00-862-002.

[Rev.8 from Aug 2018] 2026.04.04 04:26:59 UTC