40220 Tarnos - France 

Tel. +33 (0)5 59 74 40 00 - Telex 570 042 - Fax +33 (0)5 59 74 45 15

MANDATORY SERVICE BULLETIN 

ALERT

ARRIEL 2 No. A292 72 3166

Subject: Module M03 (gas generator). HP blade dampers. 

Application of modification TU 166. 

The technical information contained in this document has been approved 

under the Design Organization Approval No. EASA.21J.070.

Version: B

Reason for update: Changes in the equipment identification and 

modification compliance certificates.

SB_A292_72_3166_EN - B <September 20, 2010> - 1 / 11
MANDATORY SERVICE BULLETIN 

ALERT

1. Compliance 

Modification effectivity date * AUGUST 2010 

* Date on which this modification becomes effective and must systematically be complied with, 

according to the conditions of application (defined in §A). 

This date corresponds to when all resources needed to apply the modification (parts, tools, 

documentation, etc.) will be available. 

If these resources are available any earlier, the modification may, as an exception, be applied 

prior to the effectivity date. 

CAUTION: FAILURE TO APPLY THIS MANDATORY SB MAY LEAD TO AN UNCOMMANDED 

IN-FLIGHT ENGINE SHUT-DOWN WHICH, ON A SINGLE-ENGINE HELICOPTER, LEADS 

TO AN EMERGENCY AUTOROTATION LANDING. 

A. Application

Application of this Service Bulletin (SB) is considered mandatory as a result of a technical 

requirement which might affect flight safety. It may be done immediately or to accommodate 

an existing schedule. 

Validity Code 

ARRIEL 2B - 2B1 - 2B1A 1-B 

Note: For the application of modification TU 166 on the other engine variants, refer to SB 

No. 292 72 2166. 

Conditions of application for engines in service 

(1) Application at the operator's site or at a TURBOMECA-approved Service Center 

Before November 18, 2012 or if HP turbine is replaced. 

(2) Application at a TURBOMECA-approved Repair Center or at a TURBOMECAapproved Maintenance Center 

Upon first return, regardless of the reason for return.

B. Purpose 

To improve vibration damping of the HP blades and to limit axial displacement of the HP 

blade in relation to the disk in case of blade lock rupture or opening. 

C. Description (see Figure)

This modification consists of inserting dampers between the blades and the HP disk. 

D. Approval 

The technical information contained in this document has been approved under the Design 

Organization Approval No. EASA.21J.070. 

This Mandatory SB is subject to an Airworthiness Directive. 

E. Manpower 

(1) At the operator's site, at a TURBOMECA-approved Service Center or at a 

TURBOMECA-approved Maintenance Center 

(a) By the operator 

1 Personnel: 1 mechanic. 

2 Time required: 12 man-hours (removal/installation of module M03). 

(b) By a TURBOMECA-qualified technician 

1 Personnel: 1 technician qualified by TURBOMECA for this operation. 

2 Time required: refer to MTI Ref. X 292 M1 308 2. 

SB_A292_72_3166_EN - B <September 20, 2010> - 2 / 11
MANDATORY SERVICE BULLETIN 

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(2) At a TURBOMECA-approved Repair Center 

(a) Personnel of approved Repair Center. 

(b) Time determined by the Repair Center as being appropriate for this level of 

intervention. 

F. Material 

Refer to paragraph 3. 

G. Tooling 

(1) At the operator's site, at a TURBOMECA-approved Service Center or at a 

TURBOMECA-approved Maintenance Center 

(a) For the operator 

- Mechanic's standard tooling. 

- Tooling for removal/installation of module M03. 

(b) For a TURBOMECA-qualified technician 

Refer to MTI Ref. X 292 M1 308 2. 

(2) At a TURBOMECA-approved Repair Center 

Refer to the relevant ARRIEL 2 Overhaul Manual. 

H. Weight and balance 

Not applicable. 

I. References 

(1) ARRIEL 2B Maintenance Manual............................................. Ref. X 292 M5 450 2. 

(2) ARRIEL 2B1 Maintenance Manual........................................... Ref. X 292 N5 450 2. 

(3) ARRIEL 2B1A Maintenance Manual ........................................ Ref. X 292 P4 450 2. 

(4) ARRIEL 2B Overhaul Manual .................................................. Ref. X 292 M5 500 2. 

(5) ARRIEL 2B1 - 2B1A Overhaul Manual..................................... Ref. X 292 N5 500 2. 

(6) Maintenance Technical Instruction (MTI) ................................ Ref. X 292 M1 308 2. 

(7) Repair Technical Directive (DTR)............................................. Ref. X 292 M5 392 9 

(8) Service Bulletin ........................................................................ No. 292 72 2164. 

(9) Relevant Helicopter Maintenance Manual. 

(10) Relevant Helicopter Flight Manual. 

J. Other publications concerned 

(1) ARRIEL 2B Spare Parts Catalog.............................................. Ref. X 292 M5 700 2. 

(2) ARRIEL 2B1 Spare Parts Catalog............................................ Ref. X 292 N5 700 2. 

(3) ARRIEL 2B1A Spare Parts Catalog ......................................... Ref. X 292 P4 700 2. 

(4) ARRIEL 2B Illustrated Parts Catalog........................................ Ref. X 292 M5 600 2. 

(5) ARRIEL 2B1 Illustrated Parts Catalog...................................... Ref. X 292 N5 600 2. 

(6) ARRIEL 2B1A Illustrated Parts Catalog ................................... Ref. X 292 P4 600 2. 

SB_A292_72_3166_EN - B <September 20, 2010> - 3 / 11
MANDATORY SERVICE BULLETIN 

ALERT

2. Instructions to be incorporated 

A. Implementation 

Application of this modification necessitates removing the engine from the helicopter. 

(1) At the operator's site, at a TURBOMECA-approved Service Center or at a 

TURBOMECA-approved Maintenance Center 

(a) By the operator 

Replace module M03. 

(b) By a TURBOMECA-qualified technician 

Replace HP turbine wheel assembly. 

(2) At a TURBOMECA-approved Repair Center 

Modify HP turbine wheel assembly. 

B. Operating instructions 

(1) At the operator's site, at a TURBOMECA-approved Service Center or at a 

TURBOMECA-approved Maintenance Center 

(a) By the operator 

1 Notify your local TURBOMECA Noria representative that the equipment has 

been identified by returning the fully completed compliance certificate 

(Appendix 1 of this Mandatory SB). 

If module M03 is not modified to TU 166 standard, enter torque and T45 

temperature margin values of latest power checks in Appendix 1 of this 

Mandatory SB (as many checks as available). 

2 Remove pre TU 166 module M03: refer to relevant ARRIEL 2 Maintenance 

Manual, task 72-00-43-900-801. 

3 Return pre TU 166 module M03, along with its updated log card, to a 

TURBOMECA-approved Repair Center or Maintenance Center. 

4 Install post TU 166 module M03: refer to relevant ARRIEL 2 Maintenance 

Manual, task 72-00-43-900-801. 

(b) By a TURBOMECA-qualified technician 

1 Remove pre TU 166 HP turbine wheel assembly: refer to MTI 

Ref. X 292 M1 308 2. 

2 Store parcel containing the removed HP turbine wheel assembly and identify it 

using « NORIA TU 166 » scotch tape. Return pre TU 166 HP turbine wheel 

assembly to a TURBOMECA-approved Repair Center to apply DTR 

Ref. X 292 M5 392 9. 

3 Install post TU 166 HP turbine wheel assembly: refer to MTI 

Ref. X 292 M1 308 2. 

4 If the HP turbine is replaced at the operator’s site and if the engine power check 

results are available, record torque and T45 margins in Appendix 3 of this 

Mandatory SB. 

(2) At a TURBOMECA-approved Repair Center 

Refer to the relevant ARRIEL 2 Overhaul Manual and to DTR Ref. X 292 M5 392 9. 

C. Reconditioning and checks 

(1) At the operator's site, at a TURBOMECA-approved Service Center or at a 

TURBOMECA-approved Maintenance Center 

(a) By the operator 

1 Perform a ground run check: refer to relevant ARRIEL 2 Maintenance Manual, 

task 71-02-13-280-801. 

2 Perform a vibration check: refer to relevant ARRIEL 2 Maintenance Manual, 

task 71-02-10-760-801. 

SB_A292_72_3166_EN - B <September 20, 2010> - 4 / 11
MANDATORY SERVICE BULLETIN 

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3 Perform an oil pressure check: refer to relevant ARRIEL 2 Maintenance Manual, 

task 79-00-00-200-801. 

(b) By a TURBOMECA-qualified technician 

Refer to MTI Ref. X 292 M1 308 2. 

(2) At a TURBOMECA-approved Repair Center 

Refer to the relevant ARRIEL 2 Overhaul Manual. 

D. Identification 

(1) At the operator's site, at a TURBOMECA-approved Service Center or at a 

TURBOMECA-approved Maintenance Center 

(a) By the operator 

1 Complete the current or unique engine log book as follows: 

1.1 Complete the following sections in the current engine log book: 

- Section "B": record the replacement of module M03. 

- Section "D": update the availability status. 

- Section "E": record the replacement of module M03 and update the 

availability status. 

- Update the log card of the removed module M03 and the log card of the 

installed module M03. 

1.2 Complete the following sections in the unique engine log book: 

- Section "B": record the replacement of module M03. 

- Section "E": record the replacement of module M03 and update the 

availability status. 

- Update the log card of the removed module M03 and the log card of the 

installed module M03. 

2 Notify TURBOMECA that module M03 has been replaced by returning the fully 

completed compliance certificate (Appendix 2 of this Mandatory SB). 

(b) By a TURBOMECA-qualified technician 

1 Record the application of modification TU 166, through incorporation of MTI 

Ref. X 292 M1 308 2 on the log card of the modified module M03. 

2 Return the Technical Report referencing MTI Ref. X 292 M1 308 2. 

3 Notify TURBOMECA that modification TU 166 has been applied by returning the 

fully completed compliance certificate (Appendix 3 of this Mandatory SB) along 

with a copy of the HP turbine blade distribution sheet (if available in the engine 

log book). 

(2) At a TURBOMECA-approved Repair Center 

(a) In the unique engine log book, record the application of Mandatory SB 

No. A292 72 3166, referencing modification TU 166, on the log card of the modified 

module M03. 

(b) Notify TURBOMECA that modification TU 166 has been applied by returning the 

fully completed compliance certificate (Appendix 3 of this Mandatory SB). 

E. Routine maintenance 

Not applicable. 

SB_A292_72_3166_EN - B <September 20, 2010> - 5 / 11
MANDATORY SERVICE BULLETIN 

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3. Material information 

A. Basic information 

The parts list (provided below) required for the application of this Mandatory SB is for one 

engine. 

B. List of parts 

Note: When applying modification TU 166, modification TU 164 (SB No. 292 72 2164) will 

be simultaneously applied. 

(1) At the operator's site, at a TURBOMECA-approved Service Center or at a 

TURBOMECA-approved Maintenance Center 

(a) For the operator 

Post TU 166 module M03. 

(b) For a TURBOMECA-qualified technician 

New 

Part Number Key Qty Description Price Old Part Number Key Qty

0 292 26 049 0 

0 292 26 050 0 

0 292 26 051 0 

0 292 26 053 0 

0 292 26 054 0 

0 292 26 055 0 

7 292 26 720 C 

A 1 HP turbine wheel assembly * All Part Numbers F 1 

* Prices available upon request. 

Key 

A - Part incorporated by this modification. 

F - Part that can be modified at the manufacturer’s site or at a TURBOMECA-approved Repair 

Center. 

(2) At a TURBOMECA-approved Repair Center 

New 

Part Number Key Qty Description Old Part Number Key Qty

0 292 26 024 0 A 39 Damper 

Key 

A - Part incorporated by this modification. 

SB_A292_72_3166_EN - B <September 20, 2010> - 6 / 11
MANDATORY SERVICE BULLETIN 

ALERT

C. Supply conditions 

Supply of parts will be managed by: 

For Africa, Europe, Middle East 

TURBOMECA-Noria 

Team Tarnos 

DVO/T NORIA 

40220 TARNOS – France 

Fax:+33 (0) 5 59 74 45 72 

noria-tarnos-arriel2@turbomeca.fr 

For Australasia 

TURBOMECA-Noria 

Team Sydney 

115 Wackett St, Bankstown Airport 

Bankstown, NSW 2200 - Australia 

Fax: +61 2 9791 6708 

noria-sydney@turbomeca.com.au 

For North America 

TURBOMECA-Noria 

Team Dallas 

2709 Forum Drive 

Grand Prairie, TX 75052 – USA 

Fax : +1 972 606 76 68 

noria-dallas@turbomeca.com

For South America 

TURBOMECA-Noria 

Team Rio 

Rua Capitão Guynemer, 1626 - Xerém 

CEP : 25250-130 - Duque de Caxias - RJ - Brasil 

Fax : +55 21 2679 2794 

noria-rio@turbomeca.com.br

SB_A292_72_3166_EN - B <September 20, 2010> - 7 / 11
MANDATORY SERVICE BULLETIN 

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FIGURE 

Pale turbine HP 

HP turbine blade 

Disque turbine HP 

HP turbine disk 

Amortisseur

Damper 

SB_A292_72_3166_EN - B <September 20, 2010> - 8 / 11
MANDATORY SERVICE BULLETIN 

ALERT

Objet : Attestation d’identification du matériel - SB Impératif 

n° A292 72 3166. 

Subject: Compliance certificate for equipment identification - Mandatory SB 

No. A292 72 3166. 

Important / Important notice : A réception de ce SB Impératif, veuillez compléter la présente attestation et la retourner par courrier 

ou courriel ou fax à (cf §3.C) : 

Upon receiving this Mandatory SB, please complete this certificate and mail or email or fax it to (refer to 

§3.C):

For Africa, Europe, Middle East 

TURBOMECA-Noria (Team Tarnos) 

Fax:+33 (0) 5 59 74 45 72

noria-tarnos-arriel2@turbomeca.fr

For Australasia 

TURBOMECA-Noria (Team Sydney) 

Fax: +61 2 9791 6708

noria-sydney@turbomeca.com.au

For North America 

TURBOMECA-Noria (Team Dallas) 

Fax : +1 972 606 76 68

noria-dallas@turbomeca.com

For South America 

TURBOMECA-Noria (Team Rio) 

Fax : +55 21 2679 2794

noria-rio@turbomeca.com.br

Information concernant le matériel / Equipment information 

Utilisateur

Customer 

N° Appareil

Aircraft S/N 

N/S - S/N Réf. - P/N TSN* TSO* CSN* CSO*

Moteur 

Engine 

Module M03 

Module M03

Turbine HP à déposer 

HP turbine to be 

removed

Modification TU 166 PRE TU 166 POST TU 166

M03 TSN* Marge en couple 

Torque margin %

Marge en T45 

T45 margin °C 

 Si PRE TU 166, 

marge en couple et 

T45

If PRE TU 166, torque 

and T45 margin 

 * TSN = Time Since New (Heures depuis neuf) TSO = Time Since Overhaul (Heures depuis RG) 

 CSN = Cycles Since New (Cycles depuis neuf) CSO = Cycles Since Overhaul (Cycles depuis RG) 

Opération effectuée par : 

Work performed by: 

Date Nom / Print name Fonction / Job title

 

Signature : 

ANNEXE 1 / APPENDIX 1 

SB_A292_72_3166_EN - B <September 20, 2010> - 9 / 11
MANDATORY SERVICE BULLETIN 

ALERT

Objet : Attestation de remplacement du module M03.

Subject: Compliance certificate for replacement of module M03. 

Important / Important notice : Après application des instructions spécifiées dans ce SB Impératif, veuillez compléter la présente 

attestation et la retourner par courrier ou courriel ou fax à (cf §3.C) : 

After application of the instructions specified in this Mandatory SB, please complete this certificate and mail or 

email or fax it to (refer to §3.C):

For Africa, Europe, Middle East 

TURBOMECA-Noria (Team Tarnos) 

Fax:+33 (0) 5 59 74 45 72

noria-tarnos-arriel2@turbomeca.fr

For Australasia 

TURBOMECA-Noria (Team Sydney) 

Fax: +61 2 9791 6708

noria-sydney@turbomeca.com.au

For North America 

TURBOMECA-Noria (Team Dallas) 

Fax : +1 972 606 76 68

noria-dallas@turbomeca.com

For South America 

TURBOMECA-Noria (Team Rio) 

Fax : +55 21 2679 2794

noria-rio@turbomeca.com.br

Information concernant le matériel / Equipment information 

Utilisateur

Customer 

N° Appareil

Aircraft S/N 

N/S - S/N Réf. - P/N TSN* TSO* CSN* CSO*

Moteur 

Engine 

Module M03 déposé

Removed module M03 

Module M03 posé

Installed module M03 

* TSN = Time Since New (Heures depuis neuf) TSO = Time Since Overhaul (Heures depuis RG) 

 CSN = Cycles Since New (Cycles depuis neuf) CSO = Cycles Since Overhaul (Cycles depuis RG) 

Opération effectuée par : 

Work performed by: 

Je certifie que le module identifié ci-dessus a été installé selon les directives de ce SB Impératif. 

I certify that the above-mentioned module has been installed according to the directives given in this 

mandatory SB. 

Date Nom / Print name Fonction / Job title

 

Signature : 

ANNEXE 2 / APPENDIX 2 

SB_A292_72_3166_EN - B <September 20, 2010> - 10 / 11
MANDATORY SERVICE BULLETIN 

ALERT

Objet : Attestation d’application de la modification TU 166.

Subject: Modification TU 166 compliance certificate. 

Important / Important notice : Après application des instructions spécifiées dans ce SB Impératif, veuillez compléter la présente 

attestation et la retourner par courrier ou courriel ou fax à (cf §3.C) : 

After application of the instructions specified in this Mandatory SB, please complete this certificate and mail or 

email or fax it to (refer to §3.C):

For Africa, Europe, Middle East 

TURBOMECA-Noria (Team Tarnos) 

Fax:+33 (0) 5 59 74 45 72

noria-tarnos-arriel2@turbomeca.fr

For Australasia 

TURBOMECA-Noria (Team Sydney) 

Fax: +61 2 9791 6708

noria-sydney@turbomeca.com.au

For North America 

TURBOMECA-Noria (Team Dallas) 

Fax : +1 972 606 76 68

noria-dallas@turbomeca.com

For South America 

TURBOMECA-Noria (Team Rio) 

Fax : +55 21 2679 2794

noria-rio@turbomeca.com.br

Information concernant le matériel / Equipment information 

Utilisateur

Customer 

N° Appareil

Aircraft S/N 

N/S - S/N Réf. - P/N TSN* TSO* CSN* CSO*

Moteur 

Engine 

Module M03 modifié

Modified module M03 

Turbine HP déposée

Removed HP turbine 

Disque HP 

HP disk 

Pales HP 

HP blades 

Fiche de composition de la turbine HP déposée 

Distribution sheet of removed HP turbine

Oui 

Yes

Non 

No

Turbine HP posée

Installed HP turbine 

* TSN = Time Since New (Heures depuis neuf) TSO = Time Since Overhaul (Heures depuis RG) 

 CSN = Cycles Since New (Cycles depuis neuf) CSO = Cycles Since Overhaul (Cycles depuis RG)

Contrôle Santé Moteur si résultats disponibles 

Engine power check if results available

Marge en couple % 

Torque margin

Marge en T45 °C 

T45 margin 

Cocher si pièce remplacée durant la même intervention 

Tick if part is replaced during the same intervention 

Roue d’injection 

Injection wheel 

Segments de l’anneau de THP 

HPT ring segments

Opération effectuée par : 

Work performed by: 

Je certifie que le module identifié ci-dessus a été modifié selon les directives de ce SB Impératif. 

I certify that the above-mentioned module has been modified according to the directives given in this 

Mandatory SB. 

Date Nom / Print name Fonction / Job title

 

Signature : 

ANNEXE 3 / APPENDIX 3

SB_A292_72_3166_EN - B <September 20, 2010> - 11 / 11