W DOC AIRBUS | TSM A320F

Refuel (ACT 1) - Fails To Refuel In Manual Control

TASK 28-25-00-810-812-A
Refuel (ACT 1) - Fails To Refuel In Manual Control

WARNING: OBEY THE FUEL SAFETY PROCEDURES.
1. Possible Causes
  • RELAY-HI LVL IND CTL, ACT 1 [56QJ]
  • aircraft wiring
  • VALVE-REFUEL, ACT [41QU]
  • C/B-ACT1/CTL & SPLY [9QH]
  • C/B-ACT1/REFUEL & SPLY [33QU]
  • SWITCH-INDICATOR, ACT [24QH]
  • SWITCH-REFUEL VALVE CONTROL, ACT [40QU]
  • ACTUATOR-FUEL TRANSFER VALVE, ACT [6QH]
  • VALVE-FUEL TRANSFER, ACT [165QM]
  • RELAY-TRANSFER VALVE CONTROL, ACT [21QH]
  • RELAY- INLET VALVE CONTROL, ACT1 [19QH]
  • RELAY-REFUEL/TRANSFER CONTROL, ACT1 [35QU]
  • RELAY-REFUEL INHIBIT, ACT1 [37QU]
  • ACTUATOR-FUEL INLET VALVE, ACT1 [5QH1]
  • VALVE-FUEL INLET, ACT1 [166QM1]
  • RELAY-POWER SUPPLY SWITCH [39QU]
  • ACTUATOR-AIR SHUTOFF VALVE, ACT [3QH]
  • RELAY-PRESSURIZATION CONTROL, ACT [28QH]
  • ACTUATOR-VENT VALVE, ACT1 [4QH1]
  • VALVE-VENT, ACT1 [167QM1]
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
TSM TASK 28-28-00-810-801-A
Fuel Pumps - ACT Manual Transfer Pump 1QH System Malfunction
TSM TASK 28-28-00-810-801-A-01
 Fuel Pumps - ACT Manual Transfer Pump 1QH System Malfunction (802VU ACT Relay Testbox)
TSM TASK 28-28-00-810-802-A
Fuel - ACT 1 Manual Transfer Failure (On The Ground)
TSM TASK 28-28-00-810-802-A-01
 Fuel - ACT 1 Manual Transfer Failure (On The Ground) (802VU ACT Relay Testbox)
TSM TASK 28-46-00-810-826-A
ACT 1 HI LVL Indicator Lamp Does Not Come On When TEST Switch Set To LTS
TSM TASK 28-46-00-810-827-A
ACT 1 HI LVL Manual TEST
AMM 12-11-28-650-004
Pressure Refuel with Manual Control
AMM 12-11-28-650-005
Pressure Refuel without Electrical Power
AMM 28-25-00-710-003
Operational Test of the Refuel System
AMM 28-25-00-869-001
Fuel Transfer
ASM 282501
AMM 28-25-51-000-003
Removal of the Solenoid Valve
AMM 28-25-51-000-004
Removal of the Refuel Valve
AMM 28-25-51-400-003
Installation of the Solenoid Valve
AMM 28-25-51-400-004
Installation of the Refuel Valve
ASM 282801
ASM 282803
ASM 282804
AMM 28-28-33-000-001
Removal of the ACT Fuel Transfer-Valve
AMM 28-28-33-400-001
Installation of the ACT Fuel Transfer-Valve
AMM 28-28-34-000-001
Removal of the ACT Fuel Inlet Valve (166QM)
AMM 28-28-34-400-001
Installation of the ACT Fuel Inlet Valve (166QM)
AMM 28-28-35-000-001
Removal of the ACT Vent Shut-off Valve (167QM)
AMM 28-28-35-400-001
Installation of the ACT Vent Shut-off Valve (167QM)
AMM 28-28-53-000-001
Removal of the ACT Transfer-Valve Actuator
AMM 28-28-53-400-001
Installation of the ACT Transfer-Valve Actuator
AMM 28-28-54-000-001
Removal of the ACT Fuel Inlet Valve Actuator (5QH)
AMM 28-28-54-400-001
Installation of the ACT Fuel Inlet Valve Actuator (5QH)
AMM 28-28-55-000-001
Removal of the ACT Vent Shut-off Valve Actuator (4QH)
AMM 28-28-55-400-001
Installation of the ACT Vent Shut-off Valve Actuator (4QH)
AMM 28-28-56-000-001
Removal of the ACT Air Shut-Off Valve Actuator
AMM 28-28-56-400-001
Installation of the ACT Air Shut-Off Valve Actuator
ASM 284210
ASM 284601
3. Fault Confirmation
Subtask 28-25-00-865-053-A ** ON A/C NOT FOR ALL
A. Table of the circuit breakers referred to in this procedure:
PANELDESIGNATIONFINLOCATION
** ON A/C NOT FOR ALL
121VUACT1/REFUEL & SPLY33QUL29
121VUACT2/REFUEL & SPLY34QUL28
121VUACT1/CTL & SPLY9QHP29
121VUACT2/CTL & SPLY10QHP28
Subtask 28-25-00-710-061-A ** ON A/C NOT FOR ALL
B. Test
   (1) Make sure that you obey the steps in the Pressure Refuel with Manual Control AMM 12-11-28-650-004.
NOTE: It is not possible to refuel the ACT 1 if the P/BSW-FUEL/ACT/AUTO (24QH) is set to the FWD (pushed in), manual transfer position.
NOTE: The ACT 1 Inlet Valve Actuator (5QH1) will not open if the ACT 1 is full of fuel (high level sensor wet).
   (2) Do the Operational Test of the Refuel System AMM 28-25-00-710-003.
NOTE: You can get more data of the ACT System in the:
  • Description and Operation (D and O) section of the Aircraft Maintenance Manual (AMM) Chap, 28-25-00, the Refuel Defuel System
  • AMM Chap, 28-28-00, the Additional Center Tank (ACT) Transfer System
  • AMM Chap, 28-42-00, the Fuel Quantity Indicating System (FQIS)
  • AMM Chap, 28-46-00, the Fuel Level Sensing System (FLSS)
  • Aircraft Schematic Manual (ASM), Refuel/Defuel System Valve Control ACT 1 ASM 282501
  • ASM, ACT XFR System, Inlet Valve ASM 282801
  • ASM, ACT XFR System, Transfer Valve ASM 282803
  • ASM, ACT XFR System, Vent Valves ASM 282804
  • ASM, FQIS, Monitoring ASM 284210
  • ASM, FLSS, High Level Refuel Control ASM 284601.
4. Fault Isolation
Subtask 28-25-00-810-061-D ** ON A/C NOT FOR ALL
A. Procedure
   (1) If the ACT 1 HI LVL Indicator Lamp does not come on when the TEST Switch is set to LTS (lights) do:
   (2) If the ACT 1 HI LVL Indicator Lamp does not change condition when the TEST Switch is set to HI LVL do:
   (3) If the ACT 1 HI LVL Indicator Lamp does not go off when the TEST switch is released and the ACT 1 is not full do:
   (4) If the fault continues, examine the ACT 1 fuel quantity on the FUEL System Display page.
     (a) If the ACT 1 fuel quantity shows less than 80 kg (180 lb) (low level sensors dry):
     (b) If the ACT 1 fuel quantity shows more than 80 kg (180 lb) (low level sensors wet):
NOTE: This Step has been included as the most direct way of checking the ACT 1 Fuel Inlet Valve.
If fuel transfers (indicated by the green closed triangular transfer symbol or by examination of the ACT 1, the wing tank or the center tank fuel quantities for fuel flow), the fuel inlet valve, its actuator and associated aircraft wiring are serviceable.
   (5) If fuel can be transferred from or into the ACT 1:
  • go to Step (7).
   (6) If the fuel from the ACT 1 cannot be transferred forward:
     (a) Do ACT Manual Transfer, Pump System Failure (Ref. TSM TASK 28-28-00-810-801).
     (b) Do ACT Manual Transfer (On The Ground Failure) (Ref. TSM TASK 28-28-00-810-802).
   (7) Make sure that the C/Bs that follow are closed:
  • C/B-ACT/XFR VLV/AUTO CTL (9QH)
  • C/B-ACT/REFUEL/VALVE (33QU).
   (8) Make sure that the refuel door is open.
   (9) Make sure that the SW-MODE SELECT/REFUEL/OFF/DEFUEL/XFR (3QU) on the REFUEL/DEFUEL PANEL (800VU) is set to REFUEL.
   (10) Make sure that the SW-REFUEL VALVE/OPEN/NORM/SHUT (40QU) on the ACT REFUEL/DEFUEL PANEL (801VU) is set to OPEN.
   (11) With a MULTIMETER - STANDARD at the RELAY-PANEL (802VU) TEST connector 4068VC, do the four (4) tests ASM 282501 that follow:
     (a) Do a check that a ground is available at pin U.
NOTE: Relay-Panel 802VU Input
A ground at pin U shows that the ACT 1 has ullage (space) to receive fuel because the ACT 1 high level sensor is dry.
       1 If the ground is available at the TEST connector pin U, go to Step (b).
       2 If the ground is not available go to Step (12).
     (b) Do a check that 28VDC is available between pin N and an applicable ground.
NOTE: Relay-Panel 802VU Input
The 28VDC at pin N shows that the air shutoff valve actuator is closed and the vent valve actuator is open (their refuel positions).
       1 If the 28VDC is available at the TEST connector pin N, go to Step (c).
       2 If the 28VDC is not available go to Step (13).
     (c) Do a check that 28VDC is available between pin <A and an applicable ground.
NOTE: Relay-Panel 802VU Output
The 28VDC at pin <A is the open command to the actuator fuel inlet valve, ACT 1 (5QH1).
       1 If the 28VDC is available at the TEST connector pin <A, go to Step (d).
       2 If the 28VDC is not available go to Step (16).
     (d) Do a check that 28VDC is available between pin M and an applicable ground.
NOTE: Relay-Panel 802VU Output
The 28VDC at pin M is the open command to the valve-refuel ACT (41QU).
       1 If the 28VDC is available at the TEST connector pin (M), go to Step (14).
       2 If the 28VDC is not available go to Step (15).
   (12) If a ground is not available at the TEST connector 4068VC, pin U
     (a) Disconnect the free connector 4065VC-A from the RELAY-PANEL (802VU).
     (b) With a multimeter do a check ASM 282501 to see if a ground is available at the free connector 4065VC-A, pin <I.
     (c) If the ground is not available:
       1 Do a check of the RELAY-HI LVL IND CTL, ACT 1 [56QJ] and replace, if necessary.
       2 Do a check of the aircraft wiring ASM 282501 between:
  • the FLSCU-3 (47QJ) rack connector AA, pin 8A and the free connector 4065VC-A, pin <I (ACT 1 HI LVL (LS3) CHAN O/P)
  • the FLSCU-3 (47QJ) rack connector AA, pin 6A and the RELAY-HI LVL IND, ACT1 (56QJ), terminal A
  • RELAY-HI LVL IND, ACT1 (56QJ), terminal 2 and the ground point DC1 (ground I/P for (LS3) CHAN RELAY O/P)
  • RELAY-HI LVL IND, ACT1 (56QJ), terminal Z and the ground point DC1 (relay control coil ground)
  • RELAY-HI LVL IND, ACT1 (56QJ), terminal X and the C/B-ACT/RFL/VALVE (33QU).
     (d) Repair all the unserviceable wiring and connectors.
     (e) Connect the free connector 4065VC-A to the RELAY-PANEL (802VU).
     (f) Do the test given in Para. 3.B.(2).
     (g) If the fault continues, do ACT 1 HI LVL Manual TEST Failure (Ref. TSM TASK 28-46-00-810-827).
   (13) If 28VDC is not available at the TEST connector 4068VC, pin N
     (a) Disconnect the free connector 4065VC-A, from the RELAY-PANEL (802VU).
     (b) Do a check of the aircraft wiring ASM 282501 between:
  • the free connector 4065VC-A, pin W and the aircraft to tank interface 7619VC1, pin 21
  • the ACT 1 aircraft to tank interface free connector 7619VC1-A, pin 21 and the Actuator-Vent Valve, ACT 1 free connector 4QH1-A, pin C.
     (c) Repair all the unserviceable wiring and connectors.
     (d) Connect the free connector 4065VC-A, to the RELAY-PANEL (802VU).
     (e) Do the test given in Para. 3.B.(2).
     (f) If the fault continues:
  • go to Step (16).
   (14) If 28VDC is available at the TEST connector 4068VC, pin M
     (a) Get access to the Valve-Refuel, ACT (41QU).
     (b) Disconnect the free connector 41QU-A from the VALVE-REFUEL, ACT (41QU).
     (c) With a multimeter do a check ASM 282501 to see if 28VDC is available at the free connector 41QU-A, between the pins A (+ve) and C (-ve).
NOTE: The ground at pin C is only available if the Actuator Fuel XFR Valve (6QH) is in the closed position.
     (d) If the:
       1 28VDC (pin A) and the ground (pin C) are available at the free connector 41QU-A, in Step (14)(c):
         a Do a check of and replace, if necessary:
NOTE: The resistance of the solenoid and internally connected diode is as follows:
With the multimeter +ve lead connected to pin A and the -ve lead connected to pin C, make sure the resistance is between 200 and 300 ohms.
With the multimeter +ve lead connected to pin C and the -ve lead connected to pin A, make sure the resistance is between 20 and 30 ohms.
         b If the fault continues:
  • do a Pressure Refuel of the ACT without Electrical Power to check the VALVE-REFUEL, ACT (41QU) AMM 12-11-28-650-005.
         c Replace, if necessary, the VALVE-REFUEL, ACT [41QU] AMM 28-25-51-000-004 and AMM 28-25-51-400-004.
       2 28VDC is not available at the free connector 41QU-A, pin A in Step (14)(c):
         a Do a check of the aircraft wiring ASM 282501 between:
  • the free connector 41QU-A, pin A and the RELAY-PANEL (802VU) free connector 4065VC-A, pin <J.
         b Repair all the unserviceable wiring and connectors.
         c Connect the free connector 41QU-A to the VALVE-REFUEL, ACT (41QU).
         d Do the test given in Para. 3.B.(2).
       3 A ground is not available at the free connector 41QU-A, pin C in Step (14)(c)
         a Do a check of the aircraft wiring ASM 282501 between:
  • the free connector 41QU-A, pin C and the Actuator Fuel XFR Valve free connector 6QH-A, pin B.
         b Repair all the unserviceable wiring and connectors.
         c Connect the free connector 41QU-A to the VALVE-REFUEL, ACT (41QU).
         d Do the test given in Para. 3.B.(2).
         e If the fault continues, go to Step (16)
   (15) If 28VDC is not available at the TEST connector 4065VC, pin M
     (a) Disconnect the free connector 4065VC-A, from the RELAY-PANEL (802VU).
     (b) With a multimeter do a check ASM 282501 to see if 28VDC is available between the free connector 4065VC-A:
  • pin <G (+ve) and pin <T or <M (-ve) (normal supply)
  • pin <S (+ve) and pin <T or <M (-ve) (refuel supply).
       1 If the 28VDC is available:
  • go to Step (15)(c).
       2 If the 28VDC is not available:
         a Do a check of and replace, if necessary:
  • the C/B-ACT1/CTL & SPLY [9QH]
  • the C/B-ACT1/REFUEL & SPLY [33QU] .
         b Do a check of the aircraft wiring ASM 282501 between:
  • the C/B-ACT/XFR VALVE/AUTO CTL (9QH), terminal 2 and the free connector 4065VC-A, pin <G
  • the C/B-ACT/RFL/VALVE (33QU), terminal 2 and the free connector 4065VC-A, pin <S.
         c Repair all the unserviceable wiring and connectors.
         d Connect the free connector 4065VC-A to the RELAY-PANEL (802VU).
         e Do the test given in Para. 3.B.(2).
     (c) With a multimeter do a check ASM 282501 to see if a ground is available at the free connector 4065VC-A, pin <N.
       1 If a ground is available:
  • go to Step (15)(d).
       2 If a ground is not available:
         a Do a check of ASM 282501 and replace, if necessary:
  • the SWITCH-INDICATOR, ACT [24QH] .
         b Do a check of the aircraft wiring ASM 282501 between:
  • the P/BSW-FUEL/ACT/AUTO (24QH), terminal A2 and the free connector 4065VC-A, pin <N.
         c Repair all the unserviceable wiring and connectors.
         d Connect the free connector 4065VC-A to the RELAY-PANEL (802VU).
         e Do the test given in Para. 3.B.(2).
     (d) With a multimeter do a check ASM 282501 to see if 28VDC is available at the free connector 4065VC-A, between pin <F and an applicable ground.
       1 If the 28VDC is available:
  • go to Step (16).
       2 If the 28VDC is not available:
         a Do a check of ASM 282501 and replace, if necessary:
  • the SWITCH-REFUEL VALVE CONTROL, ACT [40QU] , part of the REFUEL/DEFUEL PANEL (801VU).
         b Do a check of the aircraft wiring ASM 282501 between:
  • the free connector 4065VC-A, pin <F and the free connector 4067VC-A, pin U
  • the free connector 4067VC-A, pin D and the free connector 4024VC-A, pin <G.
         c Repair all the serviceable wiring and connectors.
         d Connect the free connector 4065VC-A to the RELAY-PANEL (802VU).
         e Do the test given in Para. 3.B.(2).
   (16) If the fault continues (when you think all the inputs to the relay-panel are correct):
     (a) Examine the see/feel indicators of the actuators shown in the table that follows:
     (b) If any of the actuators are not in the position given in the table:
  • go to the Fault Isolation Step shown in the last column.
ACTUATOR FUNCTIONAL DESIGNATION
FIN
CORRECT REFUEL POSITION
IF ACTUATOR NOT AT THE CORRECT REFUEL POSITION, GO TO THE TROUBLE-SHOOTING STEP SHOWN BELOW
FUEL XFR VALVE
6QH
CLOSED
(17)
FUEL INLET VALVE, ACT 1
5QH1
OPEN
(19)
AIR SHUT OFF VALVE
3QH
CLOSED
(21) SEE NOTE
VENT VALVE, ACT 1
4QH1
OPEN
(23)
NOTE: The Actuator Air Shutoff Valve (3QH), 28VDC command to CLOSE, can also be checked at the RELAY-PANEL (802VU) TEST connector 4068VC, pin Z.
   (17) Actuator Fuel Transfer Valve (6QH) Refuel Trouble-shooting
     (a) Disconnect the free connector 6QH-A from the ACTUATOR-FUEL XFR VALVE, ACT (6QH).
     (b) Make sure the P/BSW-FUEL/ACT/AUTO (24QH) is set to AUTO (released out).
     (c) With a multimeter do a check ASM 282803 to see if 28VDC is available at the free connector 6QH-A, between pins C (+ve), and E (-ve).
     (d) If the voltage is correct, do a check of and replace, if necessary:
       1 The ACTUATOR-FUEL TRANSFER VALVE, ACT [6QH] AMM 28-28-53-000-001 and AMM 28-28-53-400-001.
       2 The VALVE-FUEL TRANSFER, ACT [165QM] AMM 28-28-33-000-001 and AMM 28-28-33-400-001.
     (e) If the voltage is not correct, do a check of the aircraft wiring ASM 282803 between:
  • the Actuator Fuel XFR Valve free connector 6QH-A, pin C and the RELAY-PANEL (802VU) free connector 4065VC-A, pin <P
  • the Actuator Fuel XFR Valve free connector 6QH-A, pin E and the ground point DC1.
     (f) Repair all the unserviceable wiring and connectors.
     (g) Connect the free connector 6QH-A to the ACTUATOR-FUEL XFR VALVE, ACT (6QH).
     (h) Do the test given in Para. 3.B.(2).
   (18) RELAY-PANEL (802VU) Internal Trouble-shooting for
ACTUATOR-XFR VALVE MOTOR 1 CLOSE SUPPLY
     (a) Do a check of ASM 282803 and replace, if necessary:
  • the RELAY-TRANSFER VALVE CONTROL, ACT [21QH]
  • the RELAY- INLET VALVE CONTROL, ACT1 [19QH]
  • the RELAY-REFUEL/TRANSFER CONTROL, ACT1 [35QU]
  • the RELAY-REFUEL INHIBIT, ACT1 [37QU] .
     (b) Do a check of the RELAY-PANEL (802VU) wiring ASM 282803 between:
       1 The connector 4065VC, pin <P and the RELAY-XFR VALVE CTL, ACT (21QH), terminal B3.
       2 The RELAY-XFR VALVE CTL, ACT (21QH), terminal B2 and the RELAY-INLET VALVE CTL, ACT 1 (19QH), terminal A3.
       3 Repair all the unserviceable wiring and connectors.
     (c) Do the test given in Para. 3.B.(2).

End of RELAY-PANEL (802VU) Internal Trouble-shooting for
ACTUATOR-XFR VALVE MOTOR 1 CLOSE SUPPLY.
   (19) Actuator Fuel Inlet Valve (5QH1) Refuel Trouble-shooting
     (a) Disconnect the free connector 5QH1-A from the ACTUATOR-FUEL INLET VALVE, ACT 1 (5QH1).
     (b) With a multimeter do a check ASM 282801 to see if 28VDC is available at the free connector 5QH1-A, between pins A (+ve) and E (-ve).
     (c) If the voltage is correct, do a check of and replace, if necessary:
       1 The ACTUATOR-FUEL INLET VALVE, ACT1 [5QH1] AMM 28-28-54-000-001 and AMM 28-28-54-400-001.
       2 The VALVE-FUEL INLET, ACT1 [166QM1] AMM 28-28-34-000-001 and AMM 28-28-34-400-001.
     (d) If the voltage is not correct, do a check of the aircraft wiring ASM 282801 between:
  • the free connector 5QH1-A, pin A and the aircraft to tank break free connector 7619VC1-A, pin 15
  • the free connector 5QH1-A, pin E and the aircraft to tank break free connector 7619VC1-A, pin 5
  • the aircraft to tank break connector 7619VC1, pin 15 and the RELAY-PANEL (802VU) free connector 4065VC-A, pin <H
  • the aircraft to tank break connector 7619VC1, pin 5 and the ground point DC1.
     (e) Repair all the unserviceable wiring and connectors.
     (f) Connect the free connector 5QH1-A to the ACTUATOR-FUEL INLET VALVE, ACT 1 (5QH1).
     (g) Do the test given in Para. 3.B.(2).
   (20) RELAY-PANEL (802VU) Internal Trouble-shooting for
ACTUATOR-FUEL INLET VALVE (5QH1) OPEN SUPPLY
     (a) Do a check of ASM 282801 ASM 282803 and replace, if necessary:
  • the RELAY- INLET VALVE CONTROL, ACT1 [19QH]
  • the RELAY-REFUEL/TRANSFER CONTROL, ACT1 [35QU]
  • the RELAY-REFUEL INHIBIT, ACT1 [37QU]
  • RELAY-POWER SUPPLY SWITCH [39QU] .
     (b) Do a check of the RELAY-PANEL (802VU) wiring ASM 282801 and ASM 282803 between:
       1 The connector 4065VC, pin <H and the RELAY-INLET VALVE CTL, ACT 1 (19QH), terminal B3.
       2 The RELAY-INLET VALVE CTL, ACT 1 (19QH), terminal B2 and the RELAY-REFUEL/XFR CTL, ACT 1 (35QU), terminal B1.
       3 The RELAY-REFUEL/XFR CTL, ACT 1 (35QU), terminal B2 and the RELAY-POWER SUPPLY SWITCH (39QU)), terminal C2.
       4 The RELAY-INLET VALVE CTL, ACT 1 (19QH), terminal X2 and the RELAY-REFUEL INHIBIT, ACT 1 (37QU), terminal A3.
       5 Repair all unserviceable wiring and connectors.
     (c) Do the test given in Para. 3.B.(2).

End of RELAY-PANEL (802VU) Internal Trouble-shooting for
ACTUATOR-FUEL INLET VALVE, ACT 1 MOTOR OPEN SUPPLY.
   (21) Actuator Air Shut Off Valve (3QH), Refuel Trouble-shooting
     (a) Disconnect the free connector 3QH-A from the ACTUATOR-AIR SHUTOFF VALVE, ACT (3QH).
     (b) With a multimeter do a check ASM 282804 to see if 28VDC is available at the free connector 3QH-A, between pins B (+ve), and E (-ve).
     (c) If the voltage is correct, do a check of and replace, if necessary:
     (d) If the voltage is not correct, do a check of the aircraft wiring ASM 282804 between:
  • the Actuator Air Shutoff Valve free connector 3QH-A, pin B and the RELAY-PANEL (802VU) free connector 4065VC-A, pin <R
  • the Actuator Air Shutoff Valve free connector 3QH-A, pin E and the ground point DC1.
     (e) Repair all the unserviceable wiring and connectors.
     (f) Connect the free connector 3QH-A to the ACTUATOR-AIR SHUTOFF VALVE, ACT (3QH).
     (g) Do the test given in Para. 3.B.(2).
   (22) RELAY-PANEL (802VU) Internal Trouble-shooting for
ACTUATOR-AIR SHUTOFF VALVE MOTOR CLOSE SUPPLY
     (a) Do a check of ASM 282804 and replace, if necessary:
  • the RELAY-PRESSURIZATION CONTROL, ACT [28QH] .
     (b) Do a check of the RELAY-PANEL (802VU) wiring ASM 282804 between:
       1 The connector 4065VC, pin <R and the RELAY-PRESS CTL, ACT (28QH), terminal A3.
       2 The RELAY-PRESS CTL, ACT (28QH), terminal A2 and the RELAY-POWER SUPPLY SWITCH (39QU), terminal C2.
       3 The RELAY-POWER SUPPLY SWITCH (39QU), terminal C3 and the connector 4065VC, pin <G.
       4 The RELAY-POWER SUPPLY SWITCH (39QU), terminal A1 and the connector 4065VC, pin <S.
       5 The RELAY-POWER SUPPLY SWITCH (39QU), terminals A2 and C1.
       6 Repair all the unserviceable wiring and connectors.
     (c) Do the test given in Para. 3.B.(2).

End of RELAY-PANEL (802VU) Internal Trouble-shooting for
ACTUATOR-AIR SHUTOFF VALVE MOTOR CLOSE SUPPLY.
   (23) Actuator Vent Valve (4QH1), Refuel Trouble-shooting
     (a) Disconnect the free connector 4QH1-A from the ACTUATOR-VENT VALVE, ACT 1 (4QH1).
     (b) With a multimeter do a check ASM 282804 to see if 28VDC is available at the free connector 4QH1-A, between pins A (+ve) and E (-ve).
     (c) If the voltage is correct, do a check of and replace, if necessary:
       1 The ACTUATOR-VENT VALVE, ACT1 [4QH1] AMM 28-28-55-000-001 and AMM 28-28-55-400-001.
       2 The VALVE-VENT, ACT1 [167QM1] AMM 28-28-35-000-001 and AMM 28-28-35-400-001.
     (d) If the voltage is not correct, do a check of the aircraft wiring ASM 282804 between:
  • the free connector 4QH1-A, pin A and the aircraft to tank break free connector 7619VC1-A, pin 20
  • the free connector 4QH1-A, pin E and the aircraft to tank break free connector 7619VC1-A, pin 8
  • the aircraft to tank break connector 7619VC1, pin 20 and the Actuator Air Shutoff Valve free connector 3QH-A, pin D
  • the aircraft to tank break connector 7619VC1, pin 8 and the ground point DC1.
     (e) Repair all the unserviceable wiring and connectors.
     (f) Connect the free connector 4QH1-A to the ACTUATOR-VENT VALVE, ACT 1 (4QH1).
     (g) Do the test given in Para. 3.B.(2).
     (h) If the fault continues, do a check of and replace, if necessary:
NOTE: This step is necessary because the control voltage for the Actuator Vent Valve 4QH1 comes from the Actuator Air Shutoff Valve 3QH only when it is completely closed.

No RELAY-PANEL (802VU) Internal Trouble-shooting is therefore required.
End of ACTUATOR-AIR SHUTOFF VALVE MOTOR CLOSE SUPPLY Trouble-shooting.
   (24) Do the test given in Para. 3.B.(2).
   (25) RELAY-PANEL (802VU) Internal Trouble-shooting for
Refuel-Valve, ACT (41QU) Open Supply.
     (a) Do a check of ASM 282501 ASM 282803 and replace, if necessary:
  • the RELAY-REFUEL/TRANSFER CONTROL, ACT1 [35QU]
  • the RELAY-POWER SUPPLY SWITCH [39QU] .
     (b) Do a check of the RELAY-PANEL (802VU) wiring ASM 282501 and ASM 282803 between:
  • the connector 4065VC, pin <J and the RELAY-REFUEL/XFR CTL, ACT (35QU), terminal D1
  • the TEST connector 4068VC, pin M and the RELAY-REFUEL/XFR CTL ACT (35QU), terminal D1
  • the RELAY-REFUEL/XFR CTL ACT (35QU), pins D2 and B2 (via diode)
  • the RELAY-POWER SUPPLY SW (39QU), terminal C2 and the RELAY-REFUEL/XFR CTL ACT (35QU), terminal B2
  • the connector 4065VC, pin <G and the RELAY-POWER SUPPLY SW, terminal C3
  • the connector 4065VC, pin <S and the RELAY-POWER SUPPLY SW, terminal X1 and A1
  • the connector 4065VC, pin <F and the RELAY-REFUEL/XFR CTL, ACT (35QU), terminal X1
  • the connector 4065VC, pin <I and the RELAY-REFUEL/XFR CTL, ACT (35QU), terminal X2.
     (c) Repair all the unserviceable wiring and connectors.
     (d) Do the test given in Para. 3.B.(2).

End of RELAY-PANEL (802VU) Internal Trouble-shooting for
Refuel-Valve, ACT (41QU) Open Supply.
     (e) If the fault continues:
  • go to Step (16).
[Rev.8 from Aug 2018] 2026.04.04 04:28:44 UTC
"WTRUIB" 2025