W DOC AIRBUS | AMM A320F

Wet Motoring Check [CFMI]

TASK 71-00-00-710-002-A
Wet Motoring Check

WARNING: MAKE SURE THAT ALL ENGINE OPERATING AREAS ARE AS CLEAN AS POSSIBLE. ALL RAMPS, TAXIWAYS, RUNWAYS AND OTHER OPERATING AREAS MUST BE VERY CLEAN TO PREVENT BAD DAMAGE TO THE ENGINE, AIRCRAFT AND PERSONS IN THE AREA.
WARNING: DO NOT TRY TO STOP THE FAN FROM TURNING BY HAND. THIS CAN CAUSE INJURY TO THE PERSONS AND DAMAGE TO THE EQUIPMENT.
WARNING: MAKE SURE THAT THE GROUND SAFETY-LOCKS ARE IN POSITION ON THE LANDING GEAR. THIS WILL PREVENT UNWANTED MOVEMENT OF THE LANDING GEAR, AND THUS POSSIBLE INJURY TO PERSONS AND DAMAGE TO THE AIRCRAFT AND/OR EQUIPMENT.
WARNING: DO NOT PERFORM WET-MOTORING IN A HANGAR OR IN A CLOSED AREA. A LARGE QUANTITY OF HIGHLY FLAMMABLE FUEL VAPORS COME OUT FROM THE ENGINE DURING THIS PROCEDURE AND THERE IS A RISK OF FIRE.
WARNING: MAKE SURE THAT THE TRAVEL RANGES OF THE FLIGHT CONTROLS SURFACES ARE CLEAR. MOVEMENT OF FLIGHT CONTROLS CAN CAUSE INJURY TO PERSONS AND/OR DAMAGE TO EQUIPMENT.
WARNING: DO NOT TOUCH THE PROBES DURING OR IMMEDIATELY AFTER THIS PROCEDURE. THE PROBES WILL BE HOT AND CAN BURN YOU.
WARNING: MAKE SURE THAT THE LANDING GEAR GROUND SAFETIES AND THE WHEEL CHOCKS ARE IN POSITION. MOVEMENT OF THE AIRCRAFT CAN BE DANGEROUS.
CAUTION: - SEE THE APPLICABLE FIGURE FOR WIND LIMIT RESTRICTIONS WHEN THE ENGINE OPERATES.
  • NATURAL WINDS AND IRREGULAR FORCES FROM SUDDEN GUSTS INCREASE THE DANGEROUS AREA.
  • DO NOT GO ABOVE OPEN COWLING LIMITATIONS WHEN YOU DO THE TESTS.
  • THE OPERATOR MUST FULLY KNOW ALL THE OPERATING LIMITS AND PROCEDURES BEFORE THE ENGINE OPERATES.
CAUTION: DO NOT REPLACE AN IDLE LEAK CHECK BY A MOTORING TEST. YOU CANNOT DETECT POTENTIAL OIL LEAKS WITH A MOTORING TEST. IF YOU DO A MOTORING TEST INSTEAD OF AN IDLE LEAK CHECK, YOU CAN CAUSE AN ENGINE SHUTDOWN.
CAUTION: MAKE SURE THAT THERE IS NO HYDRAULIC GROUND POWER SUPPLY CONNECTED TO THE AIRCRAFT WHEN YOU DO THIS PROCEDURE. IF A HYDRAULIC GROUND POWER SUPPLY IS CONNECTED, THERE IS A RISK OF DAMAGE TO THE ENGINE PUMPS.
ZONE: 210
ZONE: 400
FIN: 1000EM1 ** ON A/C NOT FOR ALL
FIN: 1000EM2 ** ON A/C NOT FOR ALL
1. Reason for the Job
Wet motoring is necessary for maintenance checks where you must turn the engine and have fuel flow without ignition:
  • leak check of the fuel system,
  • when engine is removed from storage
  • to prime the engine fuel system after maintenance
    The dry motoring check can be necessary during or after inspection or maintenance. The dry motoring check makes sure that the engine will turn freely and that the instruments operate correctly, and that the operation of the starter meets the speed requirements for successful starts. It can be used to dry the remaining fuel that can collect in the combustion chamber or the lower section of the turbine casing.
2. Job Set-up Information
 A. Fixtures, Tools, Test and Support Equipment
REFERENCE
QTY
DESIGNATION
No specific
AR
SAFETY CLIP - CIRCUIT BREAKER
 B. Work Zones and Access Panels
ZONE/ACCESS
ZONE DESCRIPTION
210
CKPT,FWD COMPT BHD TO FLT COMPT BULKHEAD
400
POWER PLANT, NACELLES AND PYLONS
FOR [1000EM1] (ENGINE-1)
437AL, 438AR, 451AL, 452AR
FOR [1000EM2] (ENGINE-2)
447AL, 448AR, 461AL, 462AR
 C. Referenced Information
REFERENCE
DESIGNATION
TASK 10-11-00-555-013-A
Installation of the Aircraft Protection Equipment
TASK 10-11-00-555-014-A
Removal of the Aircraft Protection Equipment
TASK 12-13-79-610-001-A
Check Oil Level and Replenish
TASK 12-13-79-610-001-A-01
Check Oil Level and Replenish (Pressure Filling)
TASK 24-41-00-861-002-A
Energize the Aircraft Electrical Circuits from the External Power
TASK 24-41-00-861-002-A-01
Energize the Aircraft Electrical Circuits from the APU
TASK 24-41-00-861-002-A-02
Energize the Aircraft Electrical Circuits from Engine 1(2)
TASK 24-41-00-862-002-A
De-energize the Aircraft Electrical Circuits Supplied from the External Power
TASK 24-41-00-862-002-A-01
De-energize the Aircraft Electrical Circuits Supplied from the APU
TASK 24-41-00-862-002-A-02
De-energize the Aircraft Electrical Circuits Supplied from the Engine 1(2)
TASK 26-12-00-710-001-A
Operational Check of Loop/Squib
TASK 31-60-00-860-001-A
EIS Start Procedure
TASK 31-60-00-860-002-A
EIS Stop Procedure
TASK 36-12-00-860-001-A
Pressurization of the Bleed System with the APU
TASK 36-12-00-860-002-A
Pressurization of the Bleed System through the HP Ground Connector
TASK 71-00-00-790-002-A
Fuel or Hydraulic or Oil Leakage Limits
TASK 71-00-00-869-005-A
Wind Limitations During Engine Ground Operations
TASK 71-00-00-869-006-A
Safety Precautions During Engine Ground Operations
TASK 71-13-00-010-040-A
Opening of the Fan Cowl Doors
TASK 71-13-00-410-040-A
Closing of the Fan Cowl Doors
TASK 78-30-00-081-041-A
Make the Thrust Reverser Serviceable after Maintenance
TASK 78-30-00-481-041-A
Make the Thrust Reverser Unserviceable for Maintenance
TASK 78-36-00-010-040-A
Opening of the Thrust Reverser Doors
TASK 78-36-00-410-040-A
Closing of the Thrust Reverser Doors
3. Job Set-up
Subtask 71-00-00-869-059-A ** ON A/C NOT FOR ALL
A. Preparation for test
CAUTION: REMOVE THE PROTECTIVE COVERS FROM THE PROBES BEFORE YOU DO THIS PROCEDURE. IF YOU DO NOT REMOVE THEM, THE PROBES AND PROTECTIVE COVERS CAN BECOME DAMAGED OR BURNED.
   (1) Remove the protective covers from the probes and sensors before you do this procedure (Ref. AMM TASK 10-11-00-555-014).
   (2) Obey wind limitations and safety precautions during engine ground operations (Ref. AMM TASK 71-00-00-869-005) and (Ref. AMM TASK 71-00-00-869-006).
   (3) Make sure that the engine inlet and exhaust covers are removed. Also, look at these areas to make sure that they are clear of unwanted objects.
   (4) Make a visual check of the temperature sensors, fan inlet, and exhaust areas. If snow or ice has collected in the fan duct, make sure that the fan turns freely. Also, make sure that the engine inlet, inlet lip, fan, spinner, and fan exhaust duct are clear of ice or snow. If the fan does not turn freely the engine should be thawed with hot air before an engine operation.
   (5) Look at the general condition of the fan spinner and fan blades, core exhaust nozzle, LPT and external surfaces of the cowls.
   (6) Make a check of the drain ports for fuel, oil and hydraulic leaks (Ref. AMM TASK 71-00-00-790-002). Also make sure that fuel drained from the engine does not cause a fire.
Subtask 71-00-00-010-052-A ** ON A/C NOT FOR ALL
B. Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-040):
   (1) FOR [1000EM1] (ENGINE-1)
437AL 438AR
   (2) FOR [1000EM2] (ENGINE-2)
447AL 448AR
Subtask 71-00-00-040-051-A ** ON A/C NOT FOR ALL
C. Make the thrust reverser unserviceable (Ref. AMM TASK 78-30-00-481-041).
Subtask 71-00-00-010-058-A ** ON A/C NOT FOR ALL
D. Open the thrust-reverser doors to the 35 degrees position (Ref. AMM TASK 78-36-00-010-040):
   (1) FOR [1000EM1] (ENGINE-1)
451AL 452AR
   (2) FOR [1000EM2] (ENGINE-2)
461AL 462AR
Subtask 71-00-00-861-051-A ** ON A/C NOT FOR ALL
E. Aircraft Maintenance Configuration
   (1) Energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-861-002)
   (2) Do the EIS start procedure (Ref. AMM TASK 31-60-00-860-001)
Subtask 71-00-00-865-051-A ** ON A/C NOT FOR ALL
F. Make sure that this(these) circuit breaker(s) is(are) closed:
PANELDESIGNATIONFINLOCATION
** ON A/C NOT FOR ALL
FOR FIN: 1000EM1 (ENGINE1)
49VUENGINE/1/FADEC A/AND EIU 12KS1A04
121VUENGINE/ENG1/OIL/PRESS2EN1N40
121VUENGINE/ENG1/OIL/QTY1EN1N39
121VUENGINE/ENG1/FADEC B/AND EIU 14KS1R41
FOR FIN: 1000EM2 (ENGINE2)
49VUENGINE/2/FADEC A/AND EIU 22KS2A05
121VUENGINE/ENG2/OIL/PRESS2EN2N42
121VUENGINE/ENG2/OIL/QTY1EN2N41
121VUENGINE/ENG2/FADEC B4KS2Q40
Subtask 71-00-00-865-055-A ** ON A/C NOT FOR ALL
G. Open, safety and tag this(these) circuit breaker(s):
PANELDESIGNATIONFINLOCATION
** ON A/C NOT FOR ALL
49VUENGINE/1 AND 2/IGN/SYS A1JHA03
FOR FIN: 1000EM1 (ENGINE1)
121VUENGINE/IGN/ENG1/SYS B3JH1P41
121VUENGINE/IGN/ENG1/SYS A BAT2JH1P39
FOR FIN: 1000EM2 (ENGINE2)
121VUENGINE/IGN/ENG2/SYS B3JH2P42
121VUENGINE/IGN/ENG2/SYS A BAT2JH2P40
Subtask 71-00-00-869-060-A ** ON A/C NOT FOR ALL
H. Continue to prepare for test
CAUTION: MAKE SURE THAT THE HYDRAULIC RESERVOIR PRESSURE IS IN THE CORRECT OPERATION RANGE BEFORE YOU START THE ENGINE. THE HYDRAULIC FLUID IS NECESSARY TO LUBRICATE THE HYDRAULIC PUMPS THAT THE ENGINE OPERATES.
   (1) Supply the aircraft pneumatic system from a HP ground power unit or the APU (Ref. AMM TASK 36-12-00-860-001) or (Ref. AMM TASK 36-12-00-860-002).
   (2) Make sure that you obey your local fire-fighting regulations.
   (3) On the lower ECAM display unit:
     (a) Get the HYDRAULIC page.
     (b) Make sure that the pressure of the Green reservoir for the engine 1 (Yellow reservoir for the engine 2) is correct.
     (c) Make sure that the reservoir fluid level is correct.
   (4) Make sure that the HYD engine 1(2) pump is serviceable (on the HYD/FUEL panel 40VU, the OFF legend of the ENG 1(2) PUMP pushbutton switch must be off).
Subtask 71-00-00-710-051-A ** ON A/C NOT FOR ALL
I. Do the operational test of the engine fire and overheat detection (loop/squib) (Ref. AMM TASK 26-12-00-710-001).
4. Procedure
Subtask 71-00-00-710-052-B ** ON A/C NOT FOR ALL
CAUTION: MAKE SURE THAT THE ENG/MASTER 1(2) CONTROL SWITCH (ON THE PANEL 115VU) IS SET TO OFF BEFORE YOU START THE FUEL PUMPS.
CAUTION: DURING THE WET-MOTORING PROCEDURE, THE "ENGINE FAIL" ECAM WARNING MESSAGE CAN COME INTO VIEW. IF IT DOES, IGNORE IT.
CAUTION: DO NOT OPERATE THE ENGINE IF THE FUEL INLET PRESSURE IS NOT POSITIVE. THE FUEL IS NECESSARY TO LUBRICATE THE ENGINE FUEL PUMP AND THE HMU AND THUS PREVENT DAMAGE.
A. Do this test:
ACTION
RESULT
1.On the HYD/FUEL panel 40VU:
  • Push all the FUEL/PUMPS pushbutton switches.
  • The OFF legends of these pushbutton switches go off.
2.Make sure that the throttle control lever of the engine 1(2) is in the idle stop position (zero on the graduated sector).

3.On the ENG panel 115VU:

  • Set the ENG/MODE/CRANK/NORM/IGN/START selector switch to CRANK.
On the lower ECAM display unit:
  • The ENGINE page comes into view.
  • Make sure that the available air pressure is between 25 psi (1.7 bar) and 55 psi (3.8 bar).
  • Make sure that the quantity of oil in the oil tank of the engine 1(2) is at least 2.6 USgal (10 l).
  • If necessary, fill the oil tank (Ref. AMM TASK 12-13-79-610-001).
4.On the overhead CTL & IND panel 22VU:
  • Push the ENG/MAN START/1(2) pushbutton switch.
  • The ON legend of this pushbutton switch comes on.

On the lower ECAM display unit, on the ENGINE page:
  • The symbol for the starter valve is in the open position.
NOTE: Make sure that you do not use the starter to more than the limits that follow: you can do the permissible duty cycles if you use one of the two procedures below:
  • 4 cycles, one after the other, each of 2 minutes duration with a 20-second rest between each cycle.
  • After 4 cycles, wait 15 minutes to let the starter cool before you try a new start or motoring.
  • One 15 minute cycle followed by a 15 minute rest to let the starter cool before you try a new start or motoring.
    It is recommended to use the 15 minute cycle only when you do maintenance operations which are not frequent.
  • No engagement of the starter when the core speed is above 20 percent.
  • while the engine is motored, do a visual check for leaks at the fuel and oil system tubes and manifolds.
5.When the N2 speed is between 15 and 20 percent, on the center pedestal ENG panel 115VU:

  • Set the ENG/MASTER 1(2) control switch to ON.
On the upper ECAM display unit:
  • The fuel flow indication FF increases.

On the lower ECAM display unit:
  • Make sure that the oil pressure indication is positive.
NOTE: Do not turn the engine for more than 15 seconds with the ENG/MASTER 1(2) control switch in the ON position.
6.On the ENG panel 115VU:
  • Set the ENG/MASTER 1(2) switch to OFF.

7.On the overhead CTL & IND panel 22VU:
  • Release the ENG/MAN START/1(2) pushbutton switch.
  • The ON legend of this pushbutton switch goes off.
Let the engine coast down.
On the upper ECAM display unit:
  • The fuel flow indication decreases to 0.

On the lower ECAM display unit:
  • The symbol for the starter valve is in the closed position.
NOTE: Do not engage the starter above 20 percent N2. If not starter damage will occur because of crash engagement.
8.When core engine speed (N2) is 15 to 10 percent, on the overhead CTL & IND panel 22VU:

  • Push the ENG/MAN START/1(2) pushbutton switch.
  • The ON legend of this pushbutton switch comes on. On the lower ECAM display unit:
  • The symbol for the starter valve is in the open position.
9.Motor the engine for 60 seconds.
This will dry the fuel that can be in the combustor.
10.After 60 seconds, on the overhead CTL & IND panel 22VU:
  • Release the ENG/MAN START/1(2) pushbutton switch.
  • The ON legend of this pushbutton switch goes off.
    On the lower ECAM display unit:
  • The symbol for the starter valve is in the closed position.
11.On the ENG panel 115VU:
  • Set the ENG/MODE/CRANK/NORM/IGN/START selector switch to NORM.
On the lower ECAM display unit:
  • The ENGINE page goes out of view.
12.On the HYD/FUEL panel 40VU:
  • Release all the FUEL/PUMPS pushbutton switches.
  • The OFF legends of these pushbutton switches come on.
Subtask 71-00-00-710-052-D ** ON A/C NOT FOR ALL
CAUTION: MAKE SURE THAT THE ENG/MASTER 1(2) CONTROL SWITCH (ON THE PANEL 115VU) IS SET TO OFF BEFORE YOU START THE FUEL PUMPS.
CAUTION: DURING THE WET-MOTORING PROCEDURE, THE "ENGINE FAIL" ECAM WARNING MESSAGE CAN COME INTO VIEW. IF IT DOES, IGNORE IT.
CAUTION: DO NOT OPERATE THE ENGINE IF THE FUEL INLET PRESSURE IS NOT POSITIVE. THE FUEL IS NECESSARY TO LUBRICATE THE ENGINE FUEL PUMP AND THE HMU AND THUS PREVENT DAMAGE.
A. Do this test:
ACTION
RESULT
1.On the HYD/FUEL panel 40VU:
  • Push all the FUEL/PUMPS pushbutton switches.
  • The OFF legends of these pushbutton switches go off.
2.Make sure that the throttle control lever of the engine 1(2) is in the idle stop position (zero on the graduated sector).

3.On the ENG panel 115VU:

  • Set the ENG/MODE/CRANK/NORM/IGN/START selector switch to CRANK.
On the lower ECAM display unit:
  • The ENGINE page comes into view.
  • Make sure that the available air pressure is between 25 psi (1.7 bar) and 55 psi (3.8 bar).
  • Make sure that the quantity of oil in the oil tank of the engine 1(2) is at least 2.6 USgal (10 l).
  • If necessary, fill the oil tank (Ref. AMM TASK 12-13-79-610-001).
4.On the overhead CTL & IND panel 22VU:
  • Push the ENG/MAN START/1(2) pushbutton switch.
  • The ON legend of this pushbutton switch comes on.

On the lower ECAM display unit, on the ENGINE page:
  • The symbol for the starter valve is in the open position.
NOTE: Make sure that you do not use the starter to more than the limits that follow: you can do the permissible duty cycles if you use one of the two procedures below:
  • 4 cycles, one after the other, each of 2 minutes duration with a 20-second rest between each cycle.
  • After 4 cycles, wait 15 minutes to let the starter cool before you try a new start or motoring.
  • One 15 minute cycle followed by a 15 minute rest to let the starter cool before you try a new start or motoring.
    It is recommended to use the 15 minute cycle only when you do maintenance operations which are not frequent.
  • No engagement of the starter when the core speed is above 20 percent.
  • while the engine is motored, do a visual check for leaks at the fuel and oil system tubes and manifolds.
5.When the N2 speed is between 15 and 20 percent, on the ENG panel 115VU:

  • Set the ENG/MASTER 1(2) control switch to ON.
On the upper ECAM display unit:
  • The fuel flow indication FF increases.

On the lower ECAM display unit:
  • Make sure that the oil pressure indication is positive.
NOTE: Do not turn the engine for more than 15 seconds with the ENG/MASTER 1(2) control switch in the ON position.
6.On the ENG panel 115VU:
  • Set the ENG/MASTER 1(2) control switch to OFF.
  • The starter valve close after ECU reset.
NOTE: After reset of the ECU the ECU will command the starter valve to open:
- when the core speed is below 20 percent and
- after the dry procedure.
7.Motor the engine for 60 seconds.
This will dry the fuel that can be in the combustor.
8.After 60 seconds, on the overhead CTL & IND panel 22VU:
  • Release the ENG/MAN START/1(2) pushbutton switch.
  • The ON legend of this pushbutton switch goes off.
    On the lower ECAM display unit:
  • The symbol for the starter valve is in the closed position.
9.On the ENG panel 115VU:
  • Set the ENG/MODE/CRANK/NORM/IGN/START selector switch to NORM.
On the lower ECAM display unit:
  • The ENGINE page goes out of view.
10.On the HYD/FUEL panel 40VU:
  • Release all the FUEL/PUMPS pushbutton switches.
  • The OFF legends of these pushbutton switches come on.
Subtask 71-00-00-200-051-A ** ON A/C NOT FOR ALL
B. During engine coastdown, while the components continue to turn listen for unusual noise from these components.
NOTE: Clicking fan blades, gear noise and seal rubs are normal noise.
Subtask 71-00-00-210-051-A ** ON A/C NOT FOR ALL
C. Make a check of the engine, fan frame and turbine for unusual roughness.
WARNING: DO NOT LET THE HMU TEMPERATURE EXCEED 100 DEG.C (212 DEG.F).
   (1) Safety precaution:
NOTE: Hydromechanical Units (HMUs) that have fluorocarbon (Viton) external seals (SB 73-078) can leak fuel for a short time when they are below 0 deg.C (32.00 deg.F) (Modification 1 and 2) (Ref. AMM TASK 71-00-00-790-002). If the ambient temperature is below -40 deg.C (-40.00 deg.F) it is recommended to heat the HMU (modification 1 and 2) to minimize leakage during starts per the following procedure:
     (a) Heat the HMU housing with a suitable hot air blower (Keco GH100, Aerotech BT400-45 or equivalent) operating at 140 deg.C (284.00 deg.F) until the HMU housing temperature is greater than 25 deg.C (77.00 deg.F).
NOTE: The HMU should be warm to the touch but not hot.
   (2) Make a check of the fuel-nozzle manifold-shrouds for leaks. No leaks are permitted.
   (3) Fuel on the shrouds is an indication of a leak in the system.
   (4) Make an inspection of the lubrication system lines, fittings and accessories for leaks.
5. Close-up
Subtask 71-00-00-869-080-B ** ON A/C NOT FOR ALL
A. If during the test the ECAM warning message ENG FAIL came into view , reset the two Flight Warning Computers (FWC). To do this open then close the circuit breakers 2WW and 3WW.
Subtask 71-00-00-865-056-A ** ON A/C NOT FOR ALL
B. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):
PANELDESIGNATIONFINLOCATION
** ON A/C NOT FOR ALL
49VUENGINE/1 AND 2/IGN/SYS A1JHA03
FOR FIN: 1000EM1 (ENGINE1)
121VUENGINE/IGN/ENG1/SYS B3JH1P41
121VUENGINE/IGN/ENG1/SYS A BAT2JH1P39
FOR FIN: 1000EM2 (ENGINE2)
121VUENGINE/IGN/ENG2/SYS B3JH2P42
121VUENGINE/IGN/ENG2/SYS A BAT2JH2P40
Subtask 71-00-00-869-061-A ** ON A/C NOT FOR ALL
C. Do these steps
   (1) Stop the pneumatic supply to the aircraft:
     (a) Disconnect the HP ground power unit or stop the APU.
   (2) Do the EIS stop procedure (Ref. AMM TASK 31-60-00-860-002).
   (3) Install covers on probes and sensors (Ref. AMM TASK 10-11-00-555-013).
Subtask 71-00-00-410-058-A ** ON A/C NOT FOR ALL
D. Close the thrust-reverser doors (Ref. AMM TASK 78-36-00-410-040):
   (1) FOR [1000EM1] (ENGINE-1)
451AL 452AR
   (2) FOR [1000EM2] (ENGINE-2)
461AL 462AR.
Subtask 71-00-00-440-051-A ** ON A/C NOT FOR ALL
E. Make the thrust reverser serviceable (Ref. AMM TASK 78-30-00-081-041).
Subtask 71-00-00-410-052-A ** ON A/C NOT FOR ALL
F. Close the fan cowl doors (Ref. AMM TASK 71-13-00-410-040):
   (1) FOR [1000EM1] (ENGINE-1)
437AL 438AR
   (2) FOR [1000EM2] (ENGINE-2)
447AL 448AR.
Subtask 71-00-00-862-051-A ** ON A/C NOT FOR ALL
G. De-energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-862-002).
[Rev.10 from 2021] 2026.04.01 02:21:24 UTC
"Aviabrain" 2025