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 A LERT

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 MAND ATORY 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.



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# MANDATORY SERVICE BULLETIN ALERT

(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 Maint enance 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 M anual ..................................... Ref. X 292 N5 500 2. (6) Maintenance Technical Instruction (MTI) ................................ Ref. X 292 M1 308 2. (7) Repair Technical Directive (D TR)............................................. 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 Catalo g.............................................. 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 Ca talog........................................ 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.



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# 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.



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# MANDATORY SERVICE BULLETIN ALERT

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 ALERT

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 manufact urer’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 ALERT

FIGURE Pale turbine HP HP turbine blade

Disque turbine HP HP turbine disk Amortisseu r Damper



## SB_A292_72_3166_EN - B <September 20, 2010> - 8 / 11

# MANDATORY SERVICE BULLETIN ALERT

Objet : Attestation d’identificati on 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) : A fter 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’applicat ion de la modi fication 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 dur ant 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



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