Accel Check [CFMI]

TASK 71-00-00-710-010-A
Accel Check

CAUTION: DO AN ON-WING TROUBLESHOOTING TEST TO CORRECT A PROBLEM BECAUSE A COMPRESSOR STALL HAS OCCURRED. IF YOU DO NOT DO THIS TROUBLESHOOTING AFTER A COMPRESSOR STALL, ENGINE DAMAGE MAY OCCUR.

1. Reason for the Job
This procedure gives instructions for fast accel from the 30 percent N1 setting. This will show that the engine accel operation is smooth and will not cause the engine to stall.

NOTE: Use this acceleration test procedure as an aid to do the troubleshooting of the engine on wing.

2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	STOPWATCH
98F10103500000	2	CHOCK-MLG,ENGINE RUN-UP

B. Referenced Information

REFERENCE	DESIGNATION
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 71-00-00-710-003-A	Engine Automatic Start
TASK 71-00-00-710-028-A	Engine Shutdown
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
TSM 71-00-00-810-807	The Engine is Slow to Accelerate
Tool Installation

3. Job Set-up
Subtask 71-00-00-869-205-A ** ON A/C NOT FOR ALL

A. Safety Precautions

CAUTION: MAKE SURE THAT THE AIRCRAFT IS PARKED ON A CLEAN, DRY AND FLAT SURFACE. THERE MUST BE NO OIL, GREASE OR SIMILAR MATERIALS ON THE SURFACE. THE PAVEMENT MUST NOT BE BROKEN OR LOOSE, AND WE RECOMMEND CONCRETE MATERIAL BECAUSE ASPHALT CAN MELT AND CAUSE DAMAGE TO THE AIRCRAFT.

(1) Obey the wind limitations and safety precautions during engine ground operation (Ref. AMM TASK 71-00-00-869-005) and (Ref. AMM TASK 71-00-00-869-006).
(2) Make sure that the 98F10103500000 CHOCK-MLG,ENGINE RUN-UP are in position in front of each forward outboard MLG wheel.

Tool Installation ** ON A/C NOT FOR ALL

(3) Make sure that there is a minimum 6614 lb (3000 kg) of fuel in the inner tanks to make sure that the aircraft is stable during the test.

NOTE: This minimum fuel quantity does not include the fuel consumption of the engines necessary to do the test. This minimum quantity must stay in the inner tank at the end of the test.

(4) There must be two qualified persons in the cockpit when performing an engine run. One must monitor the outside and the aircraft behavior while the other performs the engine test.
(5) If the aircraft begins to move while performing an engine run, immediately set all the thrust levers to the idle position.

Subtask 71-00-00-861-053-A ** ON A/C NOT FOR ALL

B. Energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-861-002).

Subtask 71-00-00-865-098-A ** ON A/C NOT FOR ALL

C. Make sure that this(these) circuit breaker(s) is(are) closed:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
49VU	L/G/LGCIU/SYS1/NORM	1GA	C09
121VU	HYDRAULIC/LGCIU/SYS2	2GA	Q35
121VU	HYDRAULIC/LGCIU/SYS1/GRND SPLY	52GA	Q34

Subtask 71-00-00-869-066-A ** ON A/C NOT FOR ALL

D. Measure and write down the Outside Air Temperature (OAT).

NOTE: To measure the OAT, put a thermometer in the shade of the nose gear well.

NOTE: It is also possible to use the Total Air Temperature (TAT) indication from the ADC (shown on the ECAM system).

On the ADIRS CDU (overhead panel 20VU), set the three OFF/NAV/ATT selector switches to NAV.
(1) On the AIR COND panel 30VU:

Release the ENG 1(2) BLEED pushbutton switch (the OFF legend comes on).

(2) On the ELEC panel 35VU:

Release the GEN 1(2) pushbutton switch (the OFF legend comes on).

(3) Enter a FLEX T/O Temperature through the MCDU:

Enter FLEX T/O temperature of 60 deg.C (140 deg.F) for OAT greater than or equal to 0 deg.C (32 deg.F).
Enter FLEX T/O temperature of 40 deg.C (104 deg.F) for OAT less than 0 deg.C (32 deg.F).

(4) Do the steps below:

ACTION	RESULT
1.On the MCDU, push the PERF MODE key	The TAKE OFF page comes on
2.On the MCDU, keyboard enter the FLEX T/O temperature	The figures entered come into view at the bottom of the screen
3.Push the line key adjacent to FLEX T/O TEMP	The value entered is memorized and shows in the FLEX T/O TEMP indication
4.Move the throttle control lever of the tested engine to the FLEX MCT detent	The FLEX T/O N1 limit and FLEX T/O show on the upper ECAM DU (upper right corner)
5.Write down the N1 LIMIT shown on the ECAM
6.Move the throttle control lever of the tested engine to the IDLE position	The climb N1 limit comes on on the upper ECAM DU
7.Push the MCDU MENU mode key	The MCDU MENU page comes into view

(5) Substract 5 percent N1 from the limit you noted, which gives the clock target point and record the new N1 percent.

Subtask 71-00-00-710-055-A ** ON A/C NOT FOR ALL

E. Start the two engines (Ref. AMM TASK 71-00-00-710-003) and let them become stable at minimum idle.

4. Procedure
Subtask 71-00-00-710-056-A ** ON A/C NOT FOR ALL

A. Do the accel check

WARNING: DO NOT LET ONE ENGINE OPERATE AT N1 GREATER THAN OR EQUAL TO 75 PERCENT WHEN ONLY THE WHEEL CHOCKS AND THE PARKING BRAKE STOP THE MOVEMENT OF THE AIRCRAFT.

(1) Slowly push the throttle control lever of the engine you must test to 30 percent N1. Let the tested engine power become stable for a minimum of 3 minutes.
(2) If the target N1 will be more than or equal to 75 percent, do this procedure:

CAUTION: DO NOT OPEN LGCIU CIRCUIT BREAKERS 1GA, 2GA AND 52GA. IF YOU DO THIS, AIRCRAFT BRAKING THROUGH BRAKE PEDALS DOES NOT OPERATE.

(a) On the landing gear control and indicating panel 402VU:

Make sure that the A/SKID & N/WSTRG selector switch 5GG is ON.
Make sure that the PARKING BRAKE control switch is in ON position.

(b) Push and hold the brake pedals at the full limit position.
(c) On the RUD TRIM/PARKING BRK panel 110VU:
- Set the PARKING BRAKE control switch to OFF.
(3) Set the opposite engine that you must not test to 60 percent N1.
(4) When the parameters become stable, move suddenly the throttle control lever from 30 percent N1 to the FLEX/MCT detent.

NOTE: During this action the following ECAM warning message can be shown : "CONFIG SLATS (FLAPS) NOT IN T.O CONFIG".

(5) Start the STOPWATCH at throttle movement.
(6) Stop the chronometer when N1 reaches the FLEX T/O target minus 5 percent that you recorded in step 3.B.(5).
(7) Record the accel time in seconds. The guideline for this time equals 7.5 seconds.

NOTE: If the time is higher than the guideline, make sure that:

On the AIR COND panel 30VU, the OFF legend of the ENG 1(2) BLEED is on
On the ELEC panel 35VU, the OFF legend of the GEN 1(2) is on.

NOTE: If you have these conditions, do the troubleshooting procedure related to a slow engine acceleration TSM 71-00-00-810-807.

(8) Move back the throttle control levers to the idle detent for the two engines.
(9) Put the aircraft in the "parking-brake applied" configuration:
(a) On the RUD TRIM/PARKING BRK panel 110VU:

Set the parking brake control switch to ON.

(b) Release the brake pedals.
(10) Let the engines become stable for 3 minutes before shutdown.
(11) Stop the engines (Ref. AMM TASK 71-00-00-710-028).

5. Close-up
Subtask 71-00-00-869-067-A ** ON A/C NOT FOR ALL

A. Close-up
(1) On the AIR COND panel 30VU:
(a) Push the ENG 1(2) BLEED pushbutton switch (the OFF legend goes off).
(2) On the ELEC panel 35VU:
(a) Push the GEN 1(2) pushbutton switch (the OFF legend goes off).

Subtask 71-00-00-862-053-A ** ON A/C NOT FOR ALL

B. De-energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-862-002).

[Rev.10 from 2021] 2026.04.01 12:54:35 UTC