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 5166

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: A

Reason for update: First Edition.

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1. Compliance 

Modification effectivity date * APRIL 2009

* 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 INFLIGHT ENGINE SHUT-DOWN.

A. Application

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

requirement which might affect safety of some flights. It may be done immediately or to 

accommodate an existing schedule.

Validity Code

ARRIEL 2C2 1-B 

Note: For application of modification TU 166 to the other ARRIEL 2 variants, refer to SB 

No. 292 72 2166 for variants 2C – 2C1 – 2S1, to Mandatory SB No. A292 72 3166 for 

variants 2B – 2B1 – 2B1A and to Mandatory SB No. A292 72 4166 for variant 2S2.

Conditions of application for engines in service 

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

Before module M03 has logged 650 operating hours after receiving this Mandatory SB or 

if the 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 HP blade axial displacement in 

relation to 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: one mechanic. 

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

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(b) By a TURBOMECA-qualified technician

1 Personnel: one TURBOMECA-qualified technician to perform the procedure. 

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

(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 2C2 Maintenance Manual............................................ Ref. X 292 N6 450 2. 

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

(3) Repair Technical Instruction (RTI)............................................. Ref. X 292 M5 392 9. 

(4) Service Bulletin (SB).................................................................. No. 292 72 2164. 

(5) Helicopter Maintenance Manual. 

(6) Helicopter Flight Manual. 

J. Other publications concerned 

(1) ARRIEL 2C2 Spare Parts Catalog............................................. Ref. X 292 N6 700 2. 

(2) ARRIEL 2C2 Illustrated Parts Catalog....................................... Ref. X 292 N6 600 2. 

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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 Inform 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 has not been modified to TU 166, record the torque and T45 

temperature margin values from the last engine health inspections (as many 

inspections as available) in Appendix 1 of this Mandatory SB. 

2 Remove pre TU 166 module M03: refer to 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 to a TURBOMECA-approved 

Maintenance Center. 

4 Install post TU 166 module M03: refer to 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 Condition and identify package which contains removed HP turbine wheel 

assembly, with “NORIA TU 166” adhesive tape. Return pre TU 166 HP turbine 

wheel assembly to a TURBOMECA-approved Repair Center for application of 

RTI 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 HP turbine replacement operation is performed at operator’s site and if engine 

health inspection results are available, record torque and T45 margins in 

compliance certificate given in Appendix 3 of this Mandatory SB. 

(2) At a TURBOMECA-approved Repair Center 

Refer to relevant ARRIEL 2 Overhaul Manual and to RTI 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 Maintenance Manual, 

task 71-02-13-280-801. 

2 Perform a vibration check: refer to Maintenance Manual, task 71-02-10-760-801. 

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3 Perform an oil pressure check: refer to 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 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, by application of MTI 

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

2 Complete the Maintenance Operation Technical Report available on TOOLS 

website (ENR0037) and return it to TURBOMECA 

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 5166, 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. 

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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 modification TU 166 is applied, modification TU 164 (SB No. 292 72 2164) 

must 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 26 048 0 

0 292 26 052 0 

7 292 26 052 A 

7 292 26 052 B 

A 1 HP turbine wheel assembly * All P/Ns 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.

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C. Supply conditions 

Supply of parts will be managed by: 

For Africa, Europe, Middle East 

TURBOMECA-Noria 

Team Tarnos 

DVO Service NORIA

40220 TARNOS – France 

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

noria-tarnos-arriel2@turbomeca.fr 

For Australasia, Oceania, Japan 

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

For Asia Pacific 

TURBOMECA-Noria 

Team Singapore 

63 Loyang Way, Singapore 508753 

Fax : +65 6545 4978 

Noria.singapore@turbomeca.com.sg

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FIGURE 

Pale turbine HP 

HP turbine blade 

Disque turbine HP 

HP turbine disk 

Amortisseur 

Damper 

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MANDATORY SERVICE BULLETIN

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Objet : Attestation d’identification du matériel - SB Impératif 

n° A292 72 5166. 

Subject: Compliance certificate for equipment identification - Mandatory SB 

No. A292 72 5166. 

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, Oceania, Japan 

TURBOMECA-Noria 

(Team Sydney) 

Fax: +61 2 9791 6708

noria-sydney@turbomeca.com.au

For Asia Pacific 

TURBOMECA-Noria 

(Team Singapore) 

Fax : +65 6545 4978

noria.singapore@turbomeca.com.sg

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 

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 [JJ / MMMM (en lettre) / AAAA 

or DD / MMMM (letter) / YYYY] Nom / Print name Fonction / Job title

 

ANNEXE 1 / APPENDIX 1

Signature : 

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MANDATORY SERVICE BULLETIN

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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, Oceania, Japan 

TURBOMECA-Noria 

(Team Sydney) 

Fax: +61 2 9791 6708

noria-sydney@turbomeca.com.au

For Asia Pacific 

TURBOMECA-Noria 

(Team Singapore) 

Fax : +65 6545 4978

noria.singapore@turbomeca.com.sg

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 [JJ / MMMM (en lettre) / AAAA 

or DD / MMMM (letter) / YYYY] Nom / Print name Fonction / Job title

 

 

ANNEXE 2 / APPENDIX 2 

 Signature : 

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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, Oceania, Japan 

TURBOMECA-Noria 

(Team Sydney) 

Fax: +61 2 9791 6708

noria-sydney@turbomeca.com.au

For Asia Pacific 

TURBOMECA-Noria 

(Team Singapore) 

Fax : +65 6545 4978

noria.singapore@turbomeca.com.sg

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 [JJ / MMMM (en lettre) / AAAA 

or DD / MMMM (letter) / YYYY] Nom / Print name Fonction / Job title

 

ANNEXE 3 / APPENDIX 3 

Signature :

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