CE DOCUMENT EST LA PROPRIETE EXCLUSIVE DE LA SOCIETE TURBOMECA, IL NE PEUT ETRE UTILISE SANS SON AUTORISATION.

THIS DOCUMENT IS THE SOLE PROPERTY OF TURBOMECA AND MAY NOT BE USED WITHOUT ITS EXPRESS AUTHORIZATION.

Instruction Technique IT_292_72_0839_EN Version E

vibration check of the 41-tooth gear

pour rien

pour rien

Langue principale : Anglais

Traduction de / Translation of IT_292_72_0839 version E

Controle des vibrations du pignon 41 dents

LIENS / Links

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DOCUMENTS DE REFERENCE / Reference documents :

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Type / Type Référence / Doc Number Désignation / Designation

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ARRIEL 1 

TURBOSHAFT ENGINE

TECHNICAL INSTRUCTION 

VIBRATION CHECK OF THE 41-TOOTH GEAR 

WITH SIMPLIFIED SYSTEM (B&K 3658-A TYPE) 

FOR CHECK IN THE TEST FIELD 

(ENGINE)

No. 292 72 0839

Update version E : February 2014 

(This update version E comes after update No. 1 of October 30, 2013)

64511 BORDES CEDEX - FRANCE - Tél. : (33) (0) 5.59.12.50.00 - Télex : 560928 

Fax : (33) (0) 5.59.53.15.12 

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Components from aircrafts involved in accidents, including engines and 

engine parts, are sometimes sold for use on airworthy aircrafts. 

Please be advised that whenever a TURBOMECA engine or engine part 

is subjected to stresses, thermal effects or other damage beyond 

normal operating parameters, some adverse change in that part may 

occur. 

Such a change may not be visually detectable and would therefore 

require destructive testing to determine airworthiness. 

Unless you can evaluate stresses, thermal effects or other damage to 

which parts are subjected as the result of an accident and determine 

that the parts still conform with their design standard, you should 

assume that any part that may affect safe operation of the aircraft is 

damaged beyond acceptable limits and must not be re-used. 

All information and data appearing in this technical instruction are the 

exclusive property of TURBOMECA. 

They are made available to the operator of the engine under a restrictive 

licence from TURBOMECA for the sole purpose of enabling safe 

operation and maintenance of the engine. 

Any other use of this information and data is subject to the prior 

agreement of sales terms with TURBOMECA. 

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All scheduled or unscheduled maintenance procedures carried out 

pursuant to a maintenance document (Maintenance Manual, Technical 

Instruction, Maintenance Technical Instruction) must be recorded in the 

relevant engine log book section(s), on the exchangeable supply log 

card (module) or the log card (accessory) where applicable. 

All modifications made pursuant to a Service Bulletin must be recorded 

in the relevant engine log book section(s), on the exchangeable supply 

log card (module) or the log card (accessory) where applicable. 

Failure to record incorporation of these maintenance procedures or 

modifications could result in unsafe engine usage conditions which 

could compromise flight safety.

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VIBRATION CHECK OF THE 41-TOOTH GEAR WITH SIMPLIFIED SYSTEM (B&K 3658-A TYPE) 

FOR CHECK IN THE TEST FIELD (ENGINE) - GENERAL

1. Introduction

This technical instruction is intended for TURBOMECA-approved technicians carrying out maintenance 

procedures on ARRIEL 1 turboshaft engines and who have followed a Level-1 or 2 maintenance training 

course. 

It describes the procedure for the vibration check to be done on an engine installed on the aircraft to 

make sure that the 41-tooth gear of the accessory gearbox (Module 01) meshes correctly. 

This procedure is requested by the Mandatory Service Bulletin No 292 72 0839.

These works must be carried out in compliance with the procedure described below. 

INFORMATION : 

This operation is illustrated by a video. Refer to LS 2891/13/ARRIEL1 available on 

the site TOOLS from TURBOMECA. 

Please refer to this support before applying this technical instruction. 

2. Reference documents

- Maintenance Manual. 

- Mandatory Service Bulletin No. 292 72 0839. 

- LS 2891/13/ARRIEL1 

3. Purpose of the operation

- Installation of the accelerometer and of the tachometer harness. 

- Check of mesh frequency order 82 of the 41-tooth gear (of the 41/23 matched gear assembly) of the 

accessory gearbox (Module 01). 

- Removal of the tachometer harness and of the accelerometer. 

4. Pre-requisites

Remove/install the connector of the engine control and monitoring harness from/on the connector of the 

gas generator tachometer transmitter (“T.T.G.” connector). Refer to Task 71-51-00-900-801 of the 

Maintenance Manual.

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VIBRATION CHECK OF THE 41-TOOTH GEAR WITH SIMPLIFIED SYSTEM (B&K 3658-A TYPE) 

FOR CHECK IN THE TEST FIELD (ENGINE) - TESTS

1. Necessary means referenced in the procedure

A. Standard tools 

Description P/N Quantity

Mechanic’s standard tool kit 1 

Laptop 1 

B. Special tools (Refer to Appendix 1) 

C. Consumables 

Description Quantity

“Aluminium”-type adhesive tape AN 

"TY-RAP"-type plastic clamp AN 

Description P/N Quantity

41-tooth gear vibrations inspection kit B&K 3658-A, 

including: 

TM5936G001 1 

- Acquisition system B&K 2250-H-200, 

including: 

TM5986G001 1 

- Vibration analyzer B&K 2250-H-001 TM5351G201 1 

- USB / micro USB cable B&K AO-1494 TM5351G601 1 

- Conditioning and measure kit B&K 4397-B, 

including: 

TM5987G001 1 

- Accelerometer cable M3 / LEMO 

B&K AO-0701-D-040 - Length 4 m 

TM5987G101 1 

- Miniature Deltatron® accelerometer 

B&K 4397-A 

TM5987G201 1 

- Screw HC with flat end DIN 913 (NORELEM 

07165-03X) B&K UA-2095 

TM5987G301 1 

- Neodymium Iron Boron pot magnet 

(ARELEC 0351123) B&K UA-2094 

TM5987G401 1 

- Tachometer acquisition kit B&K ZH-0701-A, 

including: 

TM5988G001 1 

- Tachometer harness B&K AO-1479-A-005 TM5988G101 1 

- Dual channel tacho coupler B&K WB-3487 TM5988G201 1 

- BNC / LEMO cable B&K AO-0440-D-015 - 

Length 1.5 m 

TM5988G301 1 

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D. Systematic spare parts 

Not applicable. 

E. Spare parts 

Not applicable. 

2. Reference tasks and documents

- Standard practices - General. Refer to Task 70-01-00-950-801-A01 of the Maintenance Manual. 

- Vibrations - Engine tests - General. Refer to Task 71-02-10-760-801-A01 of the Maintenance 

Manual. 

- Engine control and monitoring harness. Refer to Task 71-51-00-900-801 of the Maintenance 

Manual. 

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3. Procedure

NOTA : A training support is available on the site TOOLS from TURBOMECA, please refer 

to the introduction paragraph of this TI.

A. Preliminary procedures 

(1) Charge the acquisition module batteries for min. 5 hours to avoid any battery charge problem 

during the engine test. 

(2) Record the following information (* mandatory data to complete the metadata): 

 (a) Aircraft 

Customer * Type * Serial 

Number *

Registration 

Number

 

 (b) Engine 

Type / Variant / 

Version *

Serial 

Number *

Time since 

new

Time since 

overhaul

Time since 

repair

 

 (c) Modules 

Serial 

Number * P/N Time since new *

Time since 

overhaul

Time since 

repair

M 01 * 

M 02 

M 03 

M 04 

M 05 

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B. Preparation 

(1) Installation of the accelerometer (Refer to Figure 1301) 

(a) If necessary, install the B&K 4397-A accelerometer (TM5987G201) as follows: 

1 Install the B&K UA-2095 screw HC (TM5987G301) (hexagonal socket head side) in 

the B&K 4397-A accelerometer (TM5987G201) (flat head of the screw HC oriented 

to the pot magnet). 

2 Install the B&K UA-2094 pot magnet (TM5987G401) on the B&K 4397-A 

accelerometer (TM5987G201) / B&K UA-2095 screw HC (TM5987G301) assembly. 

3 Connect the B&K 4397-A accelerometer (TM5987G201) with the B&K AO-0701-D040 accelerometer cable (TM5987G101). 

4 Tighten the connector of the B&K AO-0701-D-040 accelerometer cable 

(TM5987G101) moderately on the B&K 4397-A accelerometer (TM5987G201). 

CAUTION: MAKE SURE THAT THE POT MAGNET BASE TOUCHES THE REAR 

SCREW OF THE FRONT ACCELEROMETER SUPPORT AND THE AXIAL 

COMPRESSOR CASING.

(b) Install the B&K 4397-A accelerometer (TM5987G201) / B&K UA-2094 pot magnet 

(TM5987G401) / B&K AO-0701-D-040 accelerometer cable (TM5987G101) assembly on 

the front accelerometer support. 

CAUTION: MAKE SURE THAT THE CABLE DOES NOT TOUCH THE HELICOPTER 

CONTROLS.

(c) Route the B&K AO-0701-D-040 accelerometer cable (TM5987G101) to the cabin, 

attaching it in different places with "Aluminium"-type adhesive tape and "TY-RAP"-type 

plastic clamps. 

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Engine vibration check - Installation of the accelerometer 

Figure 1301 

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(2) Connection to the helicopter airframe (Refer to Figure 1302) 

Connect the N1 (NG) tachometer generator as follows: 

(a) Remove the connector of the engine control and monitoring harness from the connector 

of the gas generator tachometer transmitter (“T.T.G.” connector). Refer to 

Task 71-51-00-900-801 of the Maintenance Manual. 

(b) Install the "NG" tachometer harness as follows: 

 Install the "Y" connector of the B&K AO-1479-A-005 "NG" tachometer harness 

(TM5988G101) on the connector of the gas generator tachometer transmitter (“T.T.G.” 

connector). 

 Install the "Y" connector of the B&K AO-1479-A-005 "NG" tachometer harness 

(TM5988G101) on the connector of the engine control and monitoring harness. 

CAUTION: MAKE SURE THAT THE CABLE DOES NOT TOUCH THE 

HELICOPTER CONTROLS.

(c) Route the B&K AO-1479-A-005 tachometer harness (TM5988G101) to the cabin, 

attaching it in different places with "Aluminium"-type adhesive tape and "TY-RAP"-type 

plastic clamps. 

(3) Connection of the B&K 2250-H-001 vibration analyzer (TM5351G201) (Refer to Figure 1302) 

(a) Check the charge status of the B&K QB-0061 battery (TM5351P202). 

(b) Connect the N1/NG signal output of the B&K AO-1479-A-005 tachometer harness 

(TM5988G101) to the “Input” of the B&K WB-3487 dual channel tacho coupler 

(TM5988G201). 

(c) Connect the “Output” of the B&K WB-3487 dual channel tacho coupler (TM5988G201) to 

the B&K 2250-H-001 vibration analyzer (TM5351G201) with the B&K AO-0440-D-015 

BNC / LEMO cable (TM5988G301), as follows: 

 “Trigger input” terminal for the N1/NG signal. 

(d) Connect the B&K AO-0701-D-040 accelerometer cable (TM5987G101) to the “Input” 

terminal of the B&K 2250-H-001 vibration analyzer (TM5351G201). 

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Engine vibration check - Connection of the B&K 2250-H-001 vibration analyzer 

Figure 1302

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C. Vibration measurement 

The vibration record for the 41-tooth gear includes three acquisitions: 

(1) Operate the B&K 2250-H-001 vibration analyzer (TM5351G201) as follows: 

(a) Press the ON-OFF push-button (1). 

(b) Check the date by clicking on the screen with the stylet on the date / time area at the 

bottom right, update if necessary. 

(c) In the menu select the relevant work card (« ARRIEL1 Z41 »). 

(d) Supplement all the metadatas. 

NOTE: Metadata « Start up Type » : « Cold ». 

Metadata « Comments » : « TSN M01 = XXXX :XX h ». 

(2) Acquisition No. 1: 

(a) Read and record the oil temperature. 

(b) Pulse the push-button (3) of the B&K 2250-H-001 vibration analyzer (TM5351G201) to 

start data acquisition. 

(c) Start the engine and increase up to ground idle. The following values are recorded: 

 Row vibratory data from accelerometer. 

 Tachometer signal of Gas Generator from tachometer harness. 

(d) Pulse the push-button (3) of the B&K 2250-H-001 vibration analyzer (TM5351G201) to 

stop data acquisition. 

(e) Pulse the push-button (4) of the B&K 2250-H-001 vibration analyzer (TM5351G201) to 

store the acquired data. 

(f) Pulse the RESET push-button (2) of the B&K 2250-H-001 vibration analyzer 

(TM5351G201). 

NOTE: The vibration analyzer operates for approx. five minutes from the 

moment you push the RESET pushbutton. Then it automatically goes 

to the stand-by mode. To reactivate it, press the ON-OFF push-button. 

(g) Stay at a stabilized rating until you get an oil temperature between 60°C (140°F) and 

65°C (149°F). 

NOTE: According to external conditions, it may be necessary to stabilize the 

engine flight idle to reach this oil temperature. 

(h) Stop the engine. 

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(3) Acquisition No. 2: (as soon as possible) 

(a) Operate the B&K 2250-H-001 vibration analyzer (TM5351G201) as follows: 

1 Press the ON-OFF push-button (1), if the tool is in stand-by mode. 

2 Supplement the metadata (Start up Type : « Hot1 »). 

(b) As soon as the oil temperature is between 55°C (131°F) and 60°C (140°F), pulse the 

push-button (3) of the B&K 2250-H-001 vibration analyzer (TM5351G201) to start data 

acquisition. 

(c) Start the engine and increase up to ground idle. The following values are recorded: 

 Row vibratory data from accelerometer. 

 Tachometer signal of Gas Generator from tachometer harness. 

(d) Pulse the push-button (3) of the B&K 2250-H-001 vibration analyzer (TM5351G201) to 

stop data acquisition. 

(e) Pulse the push-button (4) of the B&K 2250-H-001 vibration analyzer (TM5351G201) to 

store the acquired data. 

(f) Pulse the RESET push-button (2) of the B&K 2250-H-001 vibration analyzer 

(TM5351G201). 

NOTE: The vibration analyzer operates for approx. five minutes from the 

moment you push the RESET pushbutton. Then it automatically goes 

to the stand-by mode. To reactivate it, press the ON-OFF push-button. 

(g) Stay at a stabilized rating until you get an oil temperature between 60°C (140°F) and 

65°C (149°F). 

NOTE: According to external conditions, it may be necessary to stabilize the 

engine flight idle to reach this oil temperature.

(h) Stop the engine. 

(4) Acquisition No. 3: (as soon as possible) 

(a) Operate the B&K 2250-H-001 vibration analyzer (TM5351G201) as follows: 

1 Press the ON-OFF push-button (1), if the tool is in stand-by mode. 

2 Supplement the metadata (Start up Type : « Hot2 »). 

(b) As soon as the oil temperature is between 55°C (131°F) and 60°C (140°F), pulse the 

push-button (3) of the B&K 2250-H-001 vibration analyzer (TM5351G201) to start data 

acquisition. 

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(c) Start the engine and increase up to ground idle. The following values are recorded: 

 Row vibratory data from accelerometer. 

 Tachometer signal of Gas Generator from tachometer harness. 

(d) Pulse the push-button (3) of the B&K 2250-H-001 vibration analyzer (TM5351G201) to 

stop data acquisition. 

(e) Pulse the push-button (4) of the B&K 2250-H-001 vibration analyzer (TM5351G201) to 

store the acquired data. 

(f) Pulse the RESET push-button (2) of the B&K 2250-H-001 vibration analyzer 

(TM5351G201). 

NOTE: The vibration analyzer operates for approx. five minutes from the 

moment you push the RESET pushbutton. Then it automatically goes 

to the stand-by mode. To reactivate it, press the ON-OFF push-button. 

(g) Stop the engine. 

(5) Data processing 

(a) Disconnect the B&K 2250-H-001 vibration analyzer (TM5351G201) as follows: 

1 Disconnect and remove the B&K AO-0440-D-015 BNC / LEMO cable 

(TM5988G301) that connects the B&K 2250-H-001 vibration analyzer 

(TM5351G201) to the “Output” of the B&K WB-3487 dual channel tacho coupler 

(TM5988G201). 

2 Disconnect the N1/NG output BNC connector of the B&K AO-1479-A-005 

tachometer harness (TM5988G101) from the “Input” of the B&K WB-3487 dual 

channel tacho coupler (TM5988G201). 

(b) Energize the laptop and wait until the laptop initialization is completed. 

(c) If necessary, install the BZ 5503 software in the laptop. 

(d) Connect the B&K 2250-H-001 vibration analyzer (TM5351G201) to the laptop with the 

B&K AO-1494 USB / Micro USB cable (TM5351G601). 

(e) Open the BZ 5503 software. Download and rename the data in the laptop. 

(f) Send the three acquisitions (file by file in the following sequence: Cold - Hot1 and Hot2) 

to the Brüel&Kjaer server, to the following email address, via email (small envelope) BZ 

5503 software icon: 

 tm.z41@bkcloudservices.com. 

D. Interpretation of the vibration check 

Consider the vibration check results after receiving an email from TURBOMECA or the 

measurement report generated by the Brüel&Kjaer server, following the instructions of Mandatory 

Service Bulletin N°292 0839. 

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E. Final steps 

(1) Close the BZ 5503 software and de-energize the laptop. 

(2) Press the push-button (1) of the B&K 2250-H-001 vibration analyzer (TM5351G201) to deenergize it. 

(3) Remove the B&K AO-1494 USB / Micro USB cable (TM5351G601) to disconnect the 

B&K 2250-H-001 vibration analyzer (TM5351G201) from the laptop. 

(4) Remove the "Aluminium"-type adhesive tape and the "TY-RAP"-type plastic clamps that hold 

the B&K AO-1479-A-005 tachometer harness (TM5988G101) and the B&K AO-0701-D-040 

accelerometer harness (TM5987G101) to the airframe. 

(5) Disconnect and remove the B&K AO-0440-D-005 BNC / LEMO cable from the “Output” of the 

B&K WB-3487 dual channel tacho coupler (TM5988G201). 

(6) Disconnect the N1/NG output BNC connector of the B&K AO-1479-A-005 tachometer harness 

(TM5988G101) from the “Input” of the B&K WB-3487 dual channel tacho coupler 

(TM5988G201). 

(7) Remove the B&K AO-1479-A-005 “NG” tachometer harness (TM5988G101) as follows: 

- Remove the "Y" connector of the B&K AO-1479-A-005 "NG" tachometer harness 

(TM5988G101) from the connector of the control and monitoring harness. 

- Remove the "Y" connector of the B&K AO-1479-A-005 "NG" tachometer harness 

(TM5988G101) from the connector of the gas generator tachometer transmitter (“T.T.G.” 

connector). 

(8) Install the connector of the control and monitoring harness on the connector of the gas 

generator tachometer transmitter (“T.T.G.” connector). Refer to Task 71-51-00-900-801 of the 

Maintenance Manual. 

(9) Remove the B&K 4397-A accelerometer (TM5987G201) / B&K UA-2094 pot magnet 

(TM5987G401) / B&K AO-0701-D-040 accelerometer cable (TM5987G101) assembly from the 

front accelerometer support. 

(10) If necessary, remove the B&K 4397-A accelerometer (TM5987G201) as follows: 

(a) Remove the B&K AO-0701-D-040 accelerometer cable (TM5987G101) from the 

B&K 4397-A accelerometer (TM5987G201). 

(b) Remove the B&K 4397-A accelerometer (TM5987G201) from the B&K UA-2094 pot 

magnet (TM5987G401) / B&K UA-2095 screw HC (TM5987G301) assembly. 

(c) Remove the B&K UA-2095 screw HC (TM5987G301) from the B&K UA-2094 pot 

magnet (TM5987G401). 

(11) Package the removed equipment. 

F. Additional procedures 

Not applicable. 

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APPENDIX

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