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# MANDATORY SERVICE BULLETIN

ARRIEL 2 No. 292 72 2849

Subject: 41/23 tooth bevel gear assembly of the accessory gearbox (module M01). Application of TI No. 292 72 2849 or No. 292 72 2850 referencing vibration check.

The technical information contained in this document is approved under the Design Organization Approval No. EASA.21J.070.



## Version: B

Reason for update: Modification of the effectivity code.



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# MANDATORY SERVICE BULLETIN

1. Compliance conditions

CAUTION: FAILURE TO APPLY THIS MANDATORY SERVICE BULLETIN MAY LEAD TO AN UNCOMMANDED IN-FLIGHT ENGINE SHUT-DOWN WHICH, ON A SINGLE-ENGINE HELICOPTER, LEADS TO AN EMERGENCY AUTOROTATION LANDING. 

### A. Mandatory Service Bulleti n (SB) effectivity date Date on which this Mandatory SB becomes effective and must systematically be complied with, according to the conditions of application. This date corresponds to when all resources needed to perform the procedure (parts, tools, documentation, etc.) will be available. If these resources are available any earlier, the Mandatory SB may, as an exception, be applied prior to the effectivity date.

NOVEMBER 2013


### B. Effectivity Application of this Mandatory SB is considered mandatory as a result of a technical requirement which might affect flight safety of engines in service. It may be done as defined by the effectivity code given in the table below.

Note 1: This Mandatory SB does not apply if this version (version B) or its version A (recommended SB) is already indicated on module M01 log card. Note 2: This Mandatory SB does not apply if the the achievement of the 41 tooth gear vibration check is indicated on module M01 log card, refer to SL 2892/13/ ARRIEL2. Note 3: This Mandatory SB does not apply if the serial number of module M01 is shown in the list on Figure 01. 

## 2. Purpose

CAUTION: FAILURE TO APPLY THIS MANDATORY SERVICE BULLETIN MAY LEAD TO AN UNCOMMANDED IN-FLIGHT ENGINE SHUT-DOWN WHICH, ON A SINGLE-ENGINE HELICOPTER, LEADS TO AN EMERGENCY AUTOROTATION LANDING. The purpose of this Mandatory SB is to check the meshing quality of 41/23 tooth bevel gear of accessory gearbox (module M01). 

## 3. Reason TURBOMECA has been informed of several uncommanded in-flight shutdown events following rupture of 41 tooth gear forming part of 41/23 tooth bevel gear of accessory gearbox (module M01). Investigation into these events revealed that the meshing quality of this bevel gear could be a contributing factor in the rupture. Effectivity Code *
ARRIEL 2B - 2B1 - 2B1A - 2B1B 1-B * The actions and conditions of application are described in paragraph 5.



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# MANDATORY SERVICE BULLETIN

4. Description This Mandatory SB consists of applying a Technical Instruction (TI) to check meshing vibration level of 41/23 tooth bevel gear of module M01. 

## 5. Required actions and compliance times A. At the operator's site Application before the 31 st of October 2016. Apply TI X 292 72 2849 to check meshing vibration level of 41/23 tooth bevel gear of module M01 according to paragraph 6. Consider the vibration check results after receiving the measurement report: refer to paragraph 6.B.1. 

### B. At a TURBOMECA-approved Service Center or at a TURBOMECA-approved Maintenance Center Application before the 31 st of October 2016. Apply TI X 292 72 2850 to check meshing vibration level of 41/23 tooth bevel gear of module M01 if task 71-02-15-760-801-A01 of the Maintenance Manual is applied: refer to paragraph 6. 

### C. At a TURBOMECA-approved Repair Center Not applicable. 

## 6. Accomplishment Instructions A. Implementation The application of this Mandatory SB does not necessitate removing the engine from the helicopter. (1) At the operator's site (a) Apply TI X 292 72 2849 to check meshing vibration level of 41/23 tooth bevel gear of module M01. (b) Identify module M01 status in the FMFE of module M01, refer to paragraph 6.D.1 (c) Send an acknowledgement of receipt for t he measurement report to your NORIA coordinator, refer to paragraph 7.C. (2) At a TURBOMECA-approved Service Center or at a TURBOMECA-approved Maintenance Center If bench testing according to task 71-02-15-760-801-A01 of the Maintenance Manual: (a) Apply TI X 292 72 2850 to check meshing vibration level of 41/23 tooth bevel gear of module M01. (b) Identify module M01 status in the FMFE of module M01, refer to paragraph 6.D.2. (3) At a TURBOMECA-approved Repair Center Not applicable.



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# MANDATORY SERVICE BULLETIN

B. Operating instructions (1) At the operator's site (a) Apply TI X 72 292 2849. (b) Actions according to the vibration check result specified in the email sent by Turbomeca or in the report generated by the B&K server: 1 Level 1 - Green indicator: keep module M01 in service. 2 Level 2 - Yellow indicator: remove module M01 within 150 hours or 3 months (first limit reached). 3 Level 3 - Orange indicator: remove module M01 within 25 hours (or earlier, depending on the recommendations made by Turbomeca) or 3 months (first limit reached). 4 If "measure invalid", contact your TURBOMECA representative. (c) Send an acknowledgement of receipt by ema il or fax to your NORIA coordinator, refer to paragraph 7.C, confirming that the status of module M01 has been taken into account. (2) At a TURBOMECA-approved Service Center or at a TURBOMECA-approved Maintenance Center If maintenance task 71-02-15-760-801-A01 is applied; (a) Apply TI X 72 292 2850. (b) Actions according to the vibration check result: 1 Compliant result: release module M01 into service. 2 Non-compliant result: return module M01 to a Repair Center. (3) At a TURBOMECA-approved Repair Center Not applicable. 

### C. Reconditioning and checks (1) At the operator's site Not applicable. (2) At a TURBOMECA-approved Service Center or at a TURBOMECA-approved Maintenance Center Perform a ground run check: refer to ARRIEL 2 Maintenance Manual, task 71-02-13- 280-801. (3) At a TURBOMECA-approved Repair Center Not applicable.


### D. Identification (1) At the operator's site (a) Record the application of this Mandatory SB on the FMFE of the module M01 indicating the measurement level as follows: “level 1 – green”, “level 2 – yellow” or “level 3 – orange”, as well as the module M01 TSN at the time of the measurement. (b) If necessary, notify TURBOMECA that standard exchange of module M01 has been performed by returning the fully completed compliance certificate (Appendix).



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# MANDATORY SERVICE BULLETIN

(2) At a TURBOMECA-approved Service Center or at a TURBOMECA-approved Maintenance Center (a) If the vibration check result is compliant, record the application of this Mandatory SB on the module M01 log card. (b) If the vibration check result is not compliant, notify TURBOMECA that standard exchange of module M01 has been performed by returning the fully completed compliance certificate (Appendix). (3) At a TURBOMECA-approved Repair Center Not applicable.


### E. Routine maintenance No modification to the routine maintenance. 

## 7. Material information

A. Basic information The parts list required for the application of this Mandatory SB is for one engine. 

### B. List of parts (1) At the operator's site Refer to TI X 292 72 2849, to the Maintenance Manual and/or to the relevant ARRIEL 2 Spare Parts Catalog. (2) At a TURBOMECA-approved Service Center or at a TURBOMECA-approved Maintenance Center Refer to TI X 292 72 2850, to the relevant ARRIEL 2 Maintenance Manual and/or Spare Parts Catalog. (3) At a TURBOMECA-approved Repair Center Not applicable.



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# MANDATORY SERVICE BULLETIN

C. Supply conditions Supply of parts will be managed by:

For North and Central America TURBOMECA-Noria

Team Dallas 2709 Forum Drive Grand Prairie, TX 75052 – USA Fax : +1 972 606 76 68 noria-dallas@turbomeca.com

Team Canada 11800, rue Helen-Bristol J7N 3G8 QC MIRABEL –Canada Fax : +1 450 476 1449 noria-mirabel@turbomeca.ca

Team Mexico Montes Urales 505 Piso 3 Colonia Lomas de Chapultepec 11000 – Mexico DF noria-mexico@turbomeca.com.mx 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-arriel1@ turbomeca.fr

Team UK Concorde Way Segensworth North, Fareham Hants PO15 5RL - United Kingdom noria-tmuk@turbomeca.co.uk

Team Hamburg Borsteler Chaussee 43 22453 Hamburg – Germany Fax:+49 40 500 216 61 noria-hamburg@turbomeca.de 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 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 Asia Pacific TURBOMECA-Noria

Team Singapore 63 Loyang Way, Singapore 508753 Fax:+65 6545 4978 noria.singapore@turbomeca.com.sg



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# MANDATORY SERVICE BULLETIN

8. Manpower A. At the operator's site

- Personnel: One mechanic and one person qualified to perform a ground run check.

- Time required: 4 man-hours. 

### B. At a TURBOMECA-approved Service Center or at a TURBOMECA-approved Maintenance Center

- Personnel of approved Repair/Maintenance Center.

- Time determined by the Repair/Maintenance Center as being appropriate for this level of

intervention. 

### C. At a TURBOMECA-approved Repair Center Not applicable 

## 9. Tooling and/or products A. At the operator's site

- Mechanic's standard tooling.

- Refer to TI X 292 72 2849. 

### B. At a TURBOMECA-approved Service Center or at a TURBOMECA-approved Maintenance Center

- Mechanic's standard tooling.

- Refer to TI X 292 72 2850. 

### C. At a TURBOMECA-approved Repair Center Not applicable. 

## 10. Weight and balance Not applicable. 

## 11. Publication references

- ARRIEL 2B Maintenance Manual............................................................ Ref. X 292 M5 450 2.

- ARRIEL 2B1 Maintenance Manual.......................................................... Ref. X 292 N5 450 2.

- ARRIEL 2B1A Maintenance Manual ....................................................... Ref. X 292 P4 450 2.

- ARRIEL 2B Spare Parts Catalog............................................................. Ref. X 292 M5 700 2.

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

- ARRIEL 2B1A Spare Parts Catalog ........................................................ Ref. X 292 P4 700 2.

- Technical Instruction .............................................................................. Ref. X 292 72 2849.

- Technical Instruction .............................................................................. Ref. X 292 72 2850. 

## 12. Approval The technical information contained in this document is approved under the Design Organization Approval No. EASA.21J.070. This Mandatory SB is subject to an Airworthiness Directive.



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# MANDATORY SERVICE BULLETIN

Variante/

Variant SN M01/ NS M01 Variante/ Variant SN M01/ NS M01 2B 124 2B1 1424 2B 145 2B1 1509 2B 162 2B1 1542 2B 164 2B1 1654 2B 482 2B1 1694 2B 507 2B1 1733 2B 536 2B1 1797 2B 548 2B1 1891 2B 550 2B1 1962 2B 606 2B1 1983 2B 622 2B1 1984 2B 697 2B1 1995 2B 776 2B1 2008 2B 857 2B1 6107 2B 874 2B1 6108 2B 953 2B1 6143 2B 1052 2B1 6151 2B 1182 2B1 6163 2B 1236 2B1 6182 2B 18045 2B1 6193 2B 18073 2B1 6196 2B1 34 2B1 6301 2B1 161 2B1 6351 2B1 351 2B1 6463 2B1 365 2B1 6497 2B1 593 2B1 7377 2B1 755 2B1 7405 2B1 875 2B1 7434 2B1 899 2B1 7452 2B1 989 2B1 7456 2B1 1052 2B1 18054 2B1 1122 2B1 18082 2B1 1139 2B1 18205 2B1 1292 2B1 18251 2B1 1397 2B1A 4080 2B1 1423 2B1A 4480



### FIGURE 01 Liste des modules M01 non concernés par ce SB Impératif List of modules M01 that are not concerned by the applic ation of this Mandatory SB



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# MANDATORY SERVICE BULLETIN

Objet : Attestation de remp lacement du module M01 Subject: Compliance certificate for module M01 replacement

Important / Important notice :
Après application des instructions spécifiées dans ce SB Impératif, veuillez compléter la présente attestation et la retourner auprès de votre coordinateur NORIA local par courrier ou courriel ou fax, se reporter paragraphe 7.C

. After application of the instructions specified in this Ma ndatory SB, please complete this certificate and return it to your local coordinator NORIA by mail or email or fax, refer to paragraph. 7.C.

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 M01 déposé Removed module M01

Module M01 installé Installed module M01

* 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 in stallé selon les directives de ce SB Impératif. I certify that the above-mentioned module has been inst alled according to the directives given in this Mandatory SB.

Date [JJ / MMMM (en lettre) / AAAA

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

ANNEXE / APPENDIX Signature :



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