DOC AIRBUS | TSM A320FLoss of Fuel Flow Indication (or) Failure of the Fuel Flowmeter on Engine 2
1. Possible Causes
NOTE: This task is to troubleshoot the Clear Language Message (CLM) FUEL FLOWMETER/HC/EEC 2 (or) if the
fuel flow indication is replaced by amber crosses. The fault acronyms listed in the fault confirmation section
below will help you to focus on the correct cause of this CLM.
· harness from the EEC connector (4000KS-J2) to the fuel flowmeter (4010KS)
· FLOWMETER-FUEL ( 4010KS )
· EEC ( 4000KS )
2 Job Set-up Information
A. Referenced Information
REFERENCE DESIGNATION
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 31-60-00-860-002 EIS Stop Procedure
Ref. AMM 70-23-15-912-010 Connection of Electrical Connectors
Ref. AMM 71-00-00-710-018 Discontinued Start, Restart and Shutdown Procedures
Ref. AMM 71-00-00-710-043 Normal Engine Automatic Start Procedure
Ref. AMM 71-00-00-710-047 Normal Engine Manual Start Procedure
Ref. AMM 71-13-00-410-010 Closing of the Fan Cowls 437AL(447AL),438AR(448AR)
Ref. AMM 71-50-00-210-010 Wire Harness Visual Inspection - All Power Plant Electrical Cables
Ref. AMM 73-22-34-000-010 Removal of the Electronic Engine Control (EEC)
Ref. AMM 73-22-34-400-010 Installation of the Electronic Engine Control (EEC)
Ref. ASM 73-25-18
Ref. AMM 73-31-17-000-010 Removal of the Fuel Flow Transmitter
Ref. AMM 73-31-17-400-010 Installation of the Fuel Flow Transmitter
Ref. AMM 78-30-00-440-012 Re-activation of the Thrust Reverser Hydraulic Control Unit (HCU) after
Ground Maintenance
Ref. AMM 78-32-00-410-010 Closing of the Thrust Reverser Halves
70-00-00-03-13 STANDARD PRACTICES - ENGINE - GENERAL - TASK SUPPORTING
DATA
Fuel Flowmeter SHEET 1
Figure 73(IAE)-31-00-991-00200-A / SHEET 1/1 - Fuel Flowmeter not printed, as per printing
preferences
3. Fault Confirmation
Subtask 73-31-00-860-052-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 2 pushbutton switch.
Subtask 73-31-00-710-078-A
B. Identify the Test for Fault Confirmation
NOTE: Troubleshooting can start immediately without doing the fault confirmation if this CLM was shown
in multiple flight or ground legs.
(1) Do the CFDS message decoding and read the scheduled maintenance report to identify the fault
acronym related to the CLM (Ref. TSM 70-00-00-03) .
(2) If the readout gives the fault acronym FFL in FADEC 2A, do the steps in Para 3.C for fault
confirmation (engine idle run to confirm the fault).
(a) If the test gives the fault acronym FFL or there are two or more occurrences in fault history,
continue with fault isolation Para 4.A..
(b) If the test does not give the fault acronym FFL (for A5 engines), and there is no history of faults,
send the engine back to service.
(3) If a loss of fuel flow indication (fuel flow indication replaced by amber crosses) has been reported, do
the steps in Para 3.C. for fault confirmation (engine idle run to confirm the fault).
(a) If the test confirms the loss of fuel flow indication, continue with fault isolation Para 4.A.
(b) If the test does not confirm the loss of fuel flow indication, send the engine back to service.
Subtask 73-31-00-710-060-A
C. Do a test for fault acronym FFL or if a loss of fuel flow indication (fuel flow indication replaced by amber
crosses) has been reported:
(1) On the overhead panel 50VU, select ENG FADEC GND PWR 2 to the ON position.
NOTE: This step resets the FADEC memory.
(2) Push the INIT mode key. The INIT page comes into view.
(3) Start the engine 2 by the normal engine automatic start procedure Ref. AMM 71-00-00-710-043 or
the normal engine manual start procedure Ref. AMM 71-00-00-710-047 .
NOTE: You must operate the engine for a minimum of three minutes. If not, the LAST LEG REPORT
will not be erased and the fault will not be kept again in the EEC LAST LEG REPORT.
(4) If the fuel flow indication shows amber crosses, do the shutdown of the engine 2 by the discontinued
start, restart and shutdown procedure Ref. AMM 71-00-00-710-018 and continue with fault isolation
Para 4.A.. If not, continue with Para 3.C.(5).
(5) Do the shutdown of the engine 2 by discontinued start, restart and shutdown procedure Ref.
AMM 71-00-00-710-018 .
(6) Read the LAST LEG REPORT and the scheduled maintenance report of the FADEC 2A menu on the
MCDU (Ref. TSM 70-00-00-03) .
(a) Make a record of the fault message.
(b) Do the CFDS message decoding and read the flight data and ground data to identify the fault
acronym.
4. Fault Isolation
(Ref. Fig. Fuel Flowmeter SHEET 1)
Subtask 73-31-00-810-057-A
A. Fault Isolation for Fault Acronym FFL or if Fuel Flow Indication is Replaced by Amber Crosses
· The fuel flowmeter signal is out of range or unavailable. This is caused by an open, short to ground, or a
wire to wire short in this circuit, or the Fuel Flow Transmitter requires replacement.
NOTE: After each step that is done during this procedure, you can do the steps in Para 3. to make sure
the fault is corrected.
NOTE: Disconnection and connection of the electrical connectors can correct this fault.
NOTE: The fault acronym FFL can be found only in Channel A.
NOTE: Delay in the fuel flow indication is indicative of a faulty Fuel Flow Transmitter. The Fuel Flow
Transmitter should be scheduled for replacement at next maintenance opportunity.
(1) Do the steps that follow:
(a) Visually examine the harness from the EEC connector (4000KS-J2) to the fuel flowmeter
(4010KS) Ref. AMM 71-50-00-210-010 :
1 Look for harness damage.
2 Look for loose or damaged connectors.
3 Look for loose or damaged backshells.
NOTE: Loose backshells must be disassembled and examined for internal wiring chafing.
4 If a problem is found with the harness, repair or replace as necessary.
(b) If no problems were found with the harness, disconnect electrical connector (4010KS-A)
from the fuel flowmeter (4010KS). Examine the male and female parts of the connection Ref.
AMM 71-50-00-210-010 :
1 Examine pins and sockets (contacts) for alignment and damage.
2 Look for contacts pushed rearward into the connector face.
3 Look for ovalized sockets in the connector.
NOTE: This can be done by inserting a harness connector pin into each socket. You must
feel friction when you insert and remove the pin.
4 Repair as necessary.
(c) Do this electrical check of the fuel flowmeter in connector (4010KS-A).
1 Make sure that contacts 1, 2 and 3 are not shorted to ground.
2 Make sure that contacts 1, 2 and 3 are not shorted to other contacts in the connector.
3 Make sure the resistance from contact 2 to contact 3 is between 250 and 350 ohms.
4 Make sure the resistance from contact 3 to contact 1 is between 250 and 350 ohms.
5 If a problem is found, remove and replace the FLOWMETER-FUEL ( 4010KS ) Ref.
AMM 73-31-17-000-010 and Ref. AMM 73-31-17-400-010 .
(d) If no problems were found, disconnect electrical connector (4000KS-J2) from the EEC (4000KS).
Examine the male and female parts of the connection Ref. AMM 71-50-00-210-010 :
1 Examine pins and sockets (contacts) for alignment and damage.
2 Look for contacts pushed rearward into the connector face.
3 Look for ovalized sockets in the connector.
NOTE: This can be done by inserting a harness connector pin into each socket. You must
feel friction when you insert and remove the pin.
4 Repair as necessary.
(e) Do this electrical check of the harness. Look for:
1 Wire to wire shorts and shorts to ground.
· Wire to wire short check: measure resistance between wires. If resistance is below
100000 (100K) ohms, then the wires are shorted and must be repaired.
· Wire to ground short check: measure resistance between wire and engine metal or
ground. If resistance is below 100000 (100K) ohms, then the wire is shorted to ground and
must be repaired.
2 Continuity.
· Continuity check: measure resistance between ends of same wire. If resistance is more
than 10 ohms, then the wire must be repaired.
NOTE: An incorrectly wired harness can cause this problem. When you test these circuits,
make sure the contacts are installed in the correct positions in each connector as
specified in the wiring diagram.
Fuel Flowmeter Harness Circuit
Fuel Flowmeter (4010KS) EEC (4000KS)
(4010KS-A) (4000KS-J2)
Contacts Contacts
2 G
3 b
1 H
3 If a problem is found with the harness, repair or replace as necessary Ref. ASM 73-25-18.
(f) Install all removed connectors Ref. AMM 70-23-15-912-010 .
(g) Do the test for this fault, listed in Para 3. for fault confirmation.
1 If the test does not give the fault acronym FFL and fuel flow indication is not shown by amber
crosses, send the engine back to service.
2 If the test gives the fault acronym FFL or fuel flow indication is shown by amber crosses,
remove and replace the FLOWMETER-FUEL ( 4010KS ) Ref. AMM 73-31-17-000-010
and Ref. AMM 73-31-17-400-010 .
3 If this fault continues, remove and replace the EEC ( 4000KS ) Ref.
AMM 73-22-34-000-010 and Ref. AMM 73-22-34-400-010 .
5. Close-up
Subtask 73-31-00-860-053-A
A. Put the aircraft back to its initial configuration.
(1) Make sure that the thrust reverser halves are closed Ref. AMM 78-32-00-410-010 .
(2) Activate the thrust reverser HCU Ref. AMM 78-30-00-440-012 .
(3) Make sure that the fan cowls 447AL and 448AR are closed Ref. AMM 71-13-00-410-010 .
(4) On the ECAM control panel, set the UPPER DISPLAY and LOWER DISPLAY potentiometers to OFF.
Ref. AMM 31-60-00-860-002 .
(5) On the panel 50VU, push the ENG FADEC GND PWR 2 pushbutton switch.
(6) De-energize the aircraft electrical circuits
Ref. AMM 24-41-00-862-002 .
(7) Remove the warning notice(s).
Figure 73(IAE)-31-00-991-00200-13-A- / SHEET 1/1 - Fuel Flowmeter
End of document [Rev.6 from Feb 2017] 2026.04.04 04:36:30 UTC