Test No. 8 - Vibration Analysis (Vibration Survey) [PW11]

TASK 71-00-00-700-802-A
Test No. 8 - Vibration Analysis (Vibration Survey)

WARNING: BE CAREFUL WHEN YOU DO WORK ON THE ENGINE AND THE ADJACENT COMPONENTS AFTER ENGINE SHUTDOWN. THE ENGINE, THE ENGINE OIL AND THE ADJACENT COMPONENTS CAN STAY HOT FOR A LONG TIME. IF YOU DO NOT OBEY THIS INSTRUCTION, INJURY CAN OCCUR.

WARNING: MAKE SURE THAT ALL ENGINE-IN-OPERATION AREAS (RAMPS, TAXIWAYS, RUNWAYS, ETC.) ARE SUFFICIENTLY CLEAN TO PREVENT INJURY TO THE PERSONS IN THE AREA AND DAMAGE TO THE ENGINE OR AIRCRAFT.

ZONE: 210
ZONE: 400

1. Reason for the Job
Use this procedure to check for satisfactory engine vibration from idle power to 90 percent N1 power.
The vibration is checked for both the acceleration and deceleration operation.
For more informations about the power plant, refer to Chapter 71-00-00 CONF 21 - POWER PLANT - GENERAL - DESCRIPTION AND OPERATION.
After fan blade replacement, it is required to do the function test (fan trim balance) procedure. Refer to AMM TASK 71-00-00-700-806-A Power Plant System Maintenance (Post Maintenance Test Index) procedure.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
98F10103500000	2	CHOCK-MLG,ENGINE RUN-UP

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

C. 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 31-60-00-860-001-A	EIS Start Procedure
TASK 71-00-00-710-807-A	Function Test (Fan Trim Balance)
TASK 71-00-00-860-814-A	Shutdown of the Engine
TASK 71-00-00-860-822-A	Start the Engine (Normal Manual Start)
TASK 71-00-00-860-823-A	Start the Engine (Normal Automatic Start)
TASK 71-00-00-910-803-A	Engine Operation Limits and Guidelines
TASK 71-00-00-910-804-A	General Warnings and Cautions and Related Safety Data
TSM 71-00-00-810-856	Troubleshoot the Engine after a High (N1) Vibration event
TSM 71-00-00-810-857	Troubleshoot the Engine after a High Fan Vibration event
TSM 71-00-00-810-873	Troubleshoot the Engine After a High (N2) Vibration Event
Tool Installation

3. Job Set-up
Subtask 71-00-00-941-154-A ** ON A/C NOT FOR ALL

A. Safety Precautions
(1) Review the operation limits and safety data to prepare the aircraft and engine for ground operation (Ref. AMM TASK 71-00-00-910-803) and (Ref. AMM TASK 71-00-00-910-804).
(2) The wind direction and velocity can make the engine not stable.
(a) Make sure the engine is operated with the intake pointed into the wind (Ref. AMM TASK 71-00-00-910-804).

Subtask 71-00-00-865-190-A ** ON A/C NOT FOR ALL

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

B. 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 71-00-00-860-246-A ** ON A/C NOT FOR ALL

C. Aircraft Maintenance Configuration
(1) Energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-861-002).
(2) Do the Electronic Instrument System (EIS) start procedure (Ref. AMM TASK 31-60-00-860-001).
(3) On landing gear control and indicating panel 402VU:
(a) Make sure that the A/SKID and N/WSTRG selector switch 5GG is set to ON.
(4) On RUD TRIM/PARKING BRK panel 110VU:

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.

(a) If necessary, remove the ice and the snow from the surface.
(b) Make sure that the parking brake control-switch is set to ON.
(5) Put in position the 98F10103500000 CHOCK-MLG,ENGINE RUN-UP at each forward outboard MLG wheel.

Tool Installation ** ON A/C NOT FOR ALL

(6) Make sure that there is the necessary fuel quantity in the inner tanks.

NOTE: When the tested engine operates above N1=70% (not tested engine at N1=50%), make sure that a total of 6614 lb (3000.06 kg) (minimum) of fuel is in the inner tanks.

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 tanks at the end of the test.

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

CAUTION: BEFORE YOU DO THE PROCEDURE, MAKE SURE THAT THE ENGINE BLEED VALVES ARE OFF. IF THEY ARE ON, DAMAGE TO THE ENGINE PRECOOLER CAN OCCUR.

(9) On AIR COND panel 30VU, make sure that the ENG 1 BLEED and ENG 2 BLEED pushbutton switches are released (the OFF legends are on).

4. Procedure
Subtask 71-00-00-710-269-A ** ON A/C NOT FOR ALL

A. Do a Vibration Analysis
(1) The tested engine must be thermally stable before you do the vibration survey test. You must do the test steps that follow in the sequence shown to get a thermally stable engine:
(a) Start the engine to be tested and the opposite engine and set the power to idle in the order to get full hydraulic system redundancy (Ref. AMM TASK 71-00-00-860-823).

NOTE: This is the recommended start method for normal conditions.

(b) As an option, start the engine by the manual start procedure (Ref. AMM TASK 71-00-00-860-822).

NOTE: It is recommended to use the manual start procedure at all high altitude airports.

NOTE: It is recommended to use the manual start procedure for starts with low starter air pressure supply (external pneumatic power source).

(c) Let the engines become stable for ten minutes at MINIMUM IDLE.
(d) Make sure all the engine parameters are in the permitted limits as follows:
1 Make sure N1 and N2 are in limits (Ref. AMM TASK 71-00-00-910-803).
2 Nf limits are specified as follows:
a Maximum of 0.5 CUs at more than 80 percent N1 speed.
b Maximum of 0.4 CUs at less than 80 percent N1 speed.
3 If Nf limits are not in the permitted limits, do the fan trim balance procedure (Ref. AMM TASK 71-00-00-710-807).
(2) To make the tested engine thermally stable, do the steps as follows:

CAUTION: IF THE ENGINE DOES A SURGE DURING THIS TEST, YOU MUST MOVE THE THRUST LEVER TO MINIMUM IDLE AND DO THE PROCEDURE AFTER ENGINE SURGE OR STALL. REFER TO TASK 71-00-00-860-81900. IF YOU DO NOT OBEY THESE INSTRUCTIONS, DAMAGE TO THE ENGINE CAN OCCUR.

(a) For the tested engine, slowly move the thrust lever forward to 60 percent N1 speed and let the engine become stable for three minutes.
(b) For the tested engine, slowly move the thrust lever back to MINIMUM IDLE power and let the engine become stable for one to three minutes:
1 Do not run the test engine at MINIMUM IDLE power for more than three minutes. If you do the engine will cool and it will be necessary to do the thermal stabilization steps again.
(3) Prepare to make a record of the vibration values:

NOTE: During the acceleration and deceleration, the engine vibration will go to one or more vibration peaks.

(a) For the engine NOT being tested, do a slow acceleration to the thrust level necessary to maintain symmetric thrust or hydraulic system redundancy.
(4) For the tested engine, do the acceleration vibration survey as follows:
(a) Push and hold the brake pedals at the full limit position.
(b) On the RUD TRIM/PARKING BRK panel 110VU:
1 Make sure that the parking brake control switch is set to ON.
(c) Slowly accelerate to 90 percent N1 or maximum throttle within 90 to 120 seconds.
(d) Let the engine become thermally stable at the attained N1 percent for a maximum of five seconds:
1 Do not exceed two minutes run time at N1 speed above 70 percent, otherwise use a vortex destroyer. Steady state high power engine operation more than 70 percent N1 is not recommended without a vortex destroyer.
(e) Slowly move all thrust levers back to MINIMUM IDLE within 90 to 120 seconds.
(f) Release the brake pedals.
(g) Make a record of the maximum low and high rotor vibration levels and the corresponding rotor speeds at each of the vibration peaks as shown on the lower ECAM ENG SD.
(5) Operate the engines for ten minutes at MINIMUM IDLE to let the engine temperatures decrease.
(6) Do an engine shutdown procedure for engine(s) (Ref. AMM TASK 71-00-00-860-814).
(7) Examine the vibration records from step 4.A.(4).(g) that you made during the vibration survey:
(a) The maximum vibration values must not be more than the vibration limits shown in step 4.A.(1)(d).
(8) For engines that are more than the vibration limits or higher than necessary, do the troubleshooting for high vibration. Refer to the following:

High N1 vibration TSM 71-00-00-810-856.
High Fan vibration TSM 71-00-00-810-857.
High N2 vibration TSM 71-00-00-810-873.

5. Close-up
Subtask 71-00-00-860-247-A ** ON A/C NOT FOR ALL

A. Put the aircraft back to its initial configuration.
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Remove the 98F10103500000 CHOCK-MLG,ENGINE RUN-UP.

[Rev.10 from 2021] 2026.04.01 02:31:39 UTC