Vibration Check [CFML]

TASK 71-00-00-710-813-A
Vibration Check

WARNING: BE CAREFUL WHEN YOU DO WORK ON THE ENGINE PARTS AFTER THE ENGINE SHUTDOWN. USE APPLICABLE THERMAL GLOVES. THE ENGINE PARTS CAN STAY HOT FOR ONE HOUR AFTER SHUTDOWN AND CAN BURN YOU.

1. Reason for the Job
This task should be performed when:

A non pre-tested engine is installed or,
After FOD/ICING or,
After or for troubleshooting fan blades change.

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

REFERENCE	QTY	DESIGNATION
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 31-60-00-860-001-A	EIS Start Procedure
TASK 31-60-00-860-002-A	EIS Stop Procedure
TASK 71-00-00-860-827-A	Start the Engine (Normal Automatic Start)
TASK 71-00-00-860-829-A	Engine Shutdown
TASK 71-00-00-869-802-A	Wind Limitations During Engine Ground Operations
TASK 71-00-00-869-803-A	Safety Precautions During Engine Ground Operations
Tool Installation
Vibration Fan Conversion MILS.DA/CU
Vibration Core Conversion IPS.PK/CU for #1BRG
Vibration Core Conversion IPS.PK/CU for TCF
N2 Cockpit Unit Curve and Limits During Start (<8000 RPM)

3. Job Set-up
Subtask 71-00-00-869-366-A

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 71-00-00-869-802) and (Ref. AMM TASK 71-00-00-869-803).
(2) Make sure that the 98F10103500000 CHOCK-MLG,ENGINE RUN-UP is in position in front of each forward outboard MLG wheel.

Tool Installation

(3) Make sure that a total of 3000 kg (6613.87 lb) (minimum) of fuel are 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 71-00-00-861-112-A

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

Subtask 71-00-00-865-182-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
49VU	L/G/LGCIU/SYS1/NORM	1GA	C09
121VU	HYDRAULIC/LGCIU/SYS2	2GA	Q35
121VU	HYDRAULIC/LGCIU/SYS1/GRND SPLY	52GA	Q34

Subtask 71-00-00-720-084-A

D. Do the EIS start procedure (upper ECAM DU and lower ECAM DU only)
(Ref. AMM TASK 31-60-00-860-001).

NOTE: - For N1 module, refer to the vibration fan conversion MILS.DA/CU figure.

Vibration Fan Conversion MILS.DA/CU

- For N2 module, refer to the vibration core conversion IPS.PK/CU for #1BRG figure.

Vibration Core Conversion IPS.PK/CU for #1BRG

- For N2 module, refer to the vibration core conversion IPS.PK/CU for TCF figure.

Vibration Core Conversion IPS.PK/CU for TCF

-For N2 module, refer to the N2 cockpit unit curve and limits during start (<8000 RPM) figure.

N2 Cockpit Unit Curve and Limits During Start (<8000 RPM)

Subtask 71-00-00-860-232-A

E. Start the two engines and let them become stable at minimum idle (Ref. AMM TASK 71-00-00-860-827).
(1) On the tested engine:
(a) Stabilize 10 min at ground idle.
(b) Accelerate for a minimum of 1 min 30 from ground idle to 70 percent N1.
(c) Stabilize from 2 min to 3 min at 70 percent N1.
(d) Slowly decelerate for a minimum of 1 min 30 from 70 percent N1 to ground idle.
(e) Stabilize for 5 min at ground idle.

4. Procedure
Subtask 71-00-00-860-233-A

A. Aircraft Maintenance Configuration

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.

CAUTION: MAKE SURE THAT THE N1 VIBRATION DOES NOT BECOME HIGHER THAN 6 MILS.DA (6 CU ON THE ECAM DU). IF YOU DO NOT OBEY THIS INSTRUCTION, DAMAGE TO THE ENGINE CAN OCCUR.

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

(1) 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.

(2) Push and hold the brake pedals at the full limit position.

Subtask 71-00-00-710-251-A

B. Vibration Check
(1) On the non-tested engine slowly increase the power to 50 percent N1.
(2) For the tested engine, do a two minute acceleration from the minimum idle setting to MAX CLIMB detent (85 percent N1 minimum) and let become stable 15 seconds. Follow this acceleration with a two minute deceleration.
(a) Monitor the vibration readings and write down the engine speed (%N1) where the peak vibration occurs.
(3) Go back to the engine speed (%N1) where the peak vibration occurred and let the engine speed (%N1) become stable for thirty seconds.
(a) Monitor the vibration readings and write them down.
(4) Slowly decrease the power on the two engines to minimum idle and let become stable for ten minutes.

5. Close-up
Subtask 71-00-00-860-234-A

A. Stop the two engines (Ref. AMM TASK 71-00-00-860-829).

Subtask 71-00-00-860-267-A

B. Do the EIS stop procedure
(Ref. AMM TASK 31-60-00-860-002).

Subtask 71-00-00-862-100-A

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

[Rev.10 from 2021] 2026.04.01 02:34:05 UTC