Fuel Depulse activated on Engine 1

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1. Possible Causes
NOTE: The annunciation of the Fuel Depulse activation as a Class 3 fault has been introduced by EEC software
standard SCN 19 (Reference SB ENG 73-0197). For Pre SB ENG 73-0197 software standards, this procedure
is not applicable.
· HPC stage 7 bleed valve
· HPC stage 10 bleed valve
2 Job Set-up Information
A. Referenced Information
REFERENCE DESIGNATION
77-00-00-810-930-A EGT Higher than the Limit on Engine 1 (Idle and below Including Start)
80-00-00-810-819-A Start Fault or Hung Start on Engine 1
Ref. AMM 24-41-00-861-002 Energize the Aircraft Electrical Circuits from the External Power
Ref. AMM 24-41-00-862-002 De-energize the Aircraft Electrical Circuits Supplied from the External
Power
Ref. AMM 31-32-00-869-002 Procedure for Class 3 Faults Reading
Ref. AMM 31-60-00-860-002 EIS Stop Procedure
Ref. AMM 71-13-00-410-010 Closing of the Fan Cowls 437AL(447AL),438AR(448AR)
Ref. AMM 75-32-52-700-011 Functional Test of the HPC Stage 7 Bleed Valve with Test Set
IAE2R19437
Ref. AMM 75-32-54-700-011 Functional Test of the HPC Stage 10 Bleed Valve with Test Set
IAE2R19437
3. Fault Confirmation
Subtask 80-00-00-860-089-A
A. Job Set-up
(1) Energize the aircraft electrical circuits
Ref. AMM 24-41-00-861-002 .
(2) On the panel 50VU, release the ENG FADEC GND PWR 1 pushbutton switch.
Subtask 80-00-00-710-143-A
B. Test
(1) Adjust the brightness of the MCDU screen.
(2) Read the CLASS 3 fault report of the FADEC (1A and 1B) menu on the MCDU Ref.
AMM 31-32-00-869-002 .
(a) Make a record of the maintenance message.
NOTE: Fuel depulse is an integral part of the autostart function which is intended to enhance
starting capability. A fuel depulse does not constitute a failure as such, but indicates a
condition, which caused the compressor to stall during start.
(3) Fully decrease the brightness of the MCDU screen (display off).
4. Fault Isolation
Subtask 80-00-00-810-113-A
A. If the clear language message FUEL DEPULSE ACTIVATED was set in conjunction with an exceedance
of the EGT limit during start:
· follow (Ref. TSM 77-00-00-810-930) .
Subtask 80-00-00-810-115-A
B. If the clear language message FUEL DEPULSE ACTIVATED was set in conjunction with an experienced
Hung start:
· follow (Ref. TSM 80-00-00-810-819) .
Subtask 80-00-00-810-116-A
C. If the clear language message FUEL DEPULSE ACTIVATED was set without observation of the above:
· do functional test of the HPC stage 7 bleed valve Ref. AMM 75-32-52-700-011 .
· do functional test of the HPC stage 10 bleed valve Ref. AMM 75-32-54-700-011 .
NOTE: For additional information on bleed valve effects on engine operation (Ref. 75-00-00 Page Block
301 Task Supporting Data).
5. Close-up
Subtask 80-00-00-860-090-A
A. Put the aircraft back to its initial configuration.
(1) On the ECAM control panel, set the UPPER DISPLAY and LOWER DISPLAY potentiometers to OFF.
Ref. AMM 31-60-00-860-002 .
(2) On the panel 50VU, push the ENG FADEC GND PWR 1 pushbutton switch.
(3) De-energize the aircraft electrical circuits
Ref. AMM 24-41-00-862-002 .
(4) Make sure that the fan cowls 437AL and 438AR are closed Ref. AMM 71-13-00-410-010 . [Rev.6 from Feb 2017] 2026.04.04 04:38:42 UTC