Subject: 41/23 tooth bevel gear assembly of the accessory gearbox 

(module M01 ). 

Application of Tl No. 292 72 0839 or No. 292 72 0840 

referencing vibration check. 

The technical information contained in this document is approved under the Authority 

of Design Organization Approval No. EASA.21J.070. 

Date on which this Mandatory SB becomes effective and must systematically be complied with, 

according to the conditions of application. 

Applicable from NOVEMBER 2013 

If the resources (parts, tools, documentation, etc.) are available any earlier, the Mandatory SB may, 

be applied prior to the effectivity date. 

Version: C 

Reason for update: 

Accuracy on compliance conditions NOTES (paragraph 2.2) 

Applicable variants. ARRIEL 1 B-D-01 

SB 292 72 0839 EN- C <June 18, 2014>- 1 /11 
AUTOROTATION LANDING. 

2.1. Required actions 

2.1.1. At the operator's site 

Application before the 31st of October 2016. 

Apply Tl Ref 292 72 0839 to check meshing vibration level of 41/23 tooth bevel gear of module M01 

according to paragraph 2.3. 

Consider the vibration check results: refer to paragraph 2.3.2.1.2. 

2.1.2. By a Maintenance Center 

Application before the 31st of October 2016. 

Apply Tl Ref 292 72 0840 to check meshing vibration level of 41/23 tooth bevel gear of module M01 if 

task 71-02-15-760-801-A01 of the relevantARRIEL 1 Maintenance Manual is applied: refer to paragraph 

2.3. 

2.2. Effectivity and compliance times 

ENGINE /VARIANT CODE CONDITIONS OF APPLICATION FOR ENGINES IN SERVICE 

ARRIEL 18 1-8 Application before the 31st of October 2016. ARRIEL 1D-1D1 

Application of this Mandatory S8 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 

above. 

Note 1: This Mandatory S8 does not apply if a completed 41 tooth gear vibration check is indicated on the 

module M01 log card: 

- Reference to Service Letter (SL) No. 2891/13/ARRIEL 1, 

- Or reference to Internal Directive (CI) No. 383952, 

- Or reference to Airworthiness Directive (AD) No.2014-0036 

- Or reference to Repair Technical Instruction (RTI) Ref. X 292 65 327 2, 

- Or the log card is dated after January 31, 2014, which corresponds to update of the acceptance CCT 

including the systematic vibratory check on bench. 

- Or if this Mandatory S8 was applied (all engine versions). 

- Or if the module M01 Serial Number is given below. 

Note 2: This Mandatory S8 applies at a Maintenance Center if task 71-02-15-760-801-A01 of the relevant ARRIEL 1 

Maintenance Manual was already applied: see paragraph 2.3.1.2 

list of modules M01 that are not concerned by this Mandatory SB (equivalent to figure 1, version B of this 

M d an aory t SB) 

Variant 5/N M01 Variant 5/N M01 

18 59 101 9707 18 109 101 9758 

18 240 101 9808 

18 331 101 9878 18 421 101 9931 18 530 101 9985 18 963 101 10000 18 987 101 10077 18 4171 101 12034 

Applicable variants. ARRIEL 1 B-D-01 §2 - 1/7 

SB 292 72 0839 EN- C <June 18, 2014>- 3 I 11 
of module M01. 

2.3.1.2.2. Identify module M01 status in the module M01 log card: refer to paragraph 2.3.4.2. 

2.3.2. Operating instructions 

WARNING: FAILURE TO APPLY THIS MANDATORY SERVICE BULLETIN MAY LEAD TO AN UNCOMMANDED IN-FLIGHT 

ENGINE SHUT-DOWN WHICH, ON A SINGLE-ENGINE HELICOPTER, MAY LEAD TO AN EMERGENCY 

AUTOROTATION LANDING. 

2.3.2.1. At the operator's site (equivalent to paragraph 6.B.(1 ), in version B of this Mandatory SB) 

2.3.2.1.1 . Apply Tl Ref 292 72 0839. 

2.3.2.1.2. Actions according to the vibration check result specified in the email sent by 

TURBOMECA or in the report generated by the B&K server: 

Level 1 - Green indicator: keep module M01 in service. 

Level2- Yellow indicator: remove module M01 within 150 hours or 3 months 

(whichever is reached first). 

Level 3- Orange indicator: remove module M01 within 25 hours (or earlier, 

depending on the recommendations made by TURBOMECA) or 3 months 

(whichever is reached first). 

If "measure invalid", cont act your TURBOMECA representative. 

2.3.2.1.3. Send an acknowledgement of receipt by email or fax to your NORIA coordinator 'D 

(refer to paragraph 2.4.3) confirming that the status of module M01 has been taken 

into account. 

2.3.2.2. By a Maintenance Center 

If maintenance task 71-02-15-760-801-A01 of the relevant ARRIEL 1 Maintenance Manual is 

applied: 

2.3.2.2.1. Apply Tl Ref 292 72 0840. 

2.3.2.2.2. Actions according to the vibration check result: 

Compliant result: release module MOl into service. 

> Non-compliant result: return module MOl to a Repair Center. 

2.3.3. Reconditioning and checks 

Refer to relevant ARRIEL 1 Maintenance Manual, task 05-50. 

2.3.4. Identification 

2.3.4.1. At the operator's site 

2.3.4.1.1. Record the application of this Mandatory SB on the module M01 log card 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. 

2.3.4.1.2. If necessary, notify TURBOMECA that standard exchange of module M01 has been 

performed by returning the fully completed compliance certificate (Appendix 2.1 ). 

Applicable vanants: ARRIEL 1 B·D-0 1 §2 - 3n 

SB 292 72 0839 EN - C <June 18, 2014> - 5 I 11 
T 

u 

R 

B 

0 

M 

E 

c 

A 

N 

0 

R 

I 

A 

2.5. Manpower 

noria-tarnos-amel1@ turbomeca.fr 

Team UK 

Concorde Way 

Segensworth North, Fareham 

Hants P015 5RL - United Kingdom 

noria-tmuk@turbomeca.co.uk 

Team Hamburg 

Borsteler Chaussee 43 

22453 Hamburg - Germany 

Fax:+49 40 500 216 61 

nona-hamburg@turbomeca.de 

For Australasia, Oceania, Japan 

Team Sydney 

115 Wackett St. Bankstown Airport 

Bankstown, NSW 2200 -Australia 

Fax : +61 2 9791 6708 

noria-s:id ne:i@tu rbomeca. com. au 

For Asia Pacific 

Team Singapore 

63 Loyang Way, Singapore 508753 

Fax:+65 6545 4978 

noria.sinaaoore@turbomeca.com sa 

2.5.1. At the operator's site 

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 OF 

noria-mexico@turbomeca.com mx 

For South America 

Team Rio 

Rua Capitao Guynemer, 1626 - Xerem 

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

Fax : +55 21 2679 2794 

noria-rio@turbomeca com br 

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

- Time required: 4 man-hours (application of Tl Ref 292 72 0839). 

2.5.2. By a maintenance Center 

- Personnel: One TURBOMECA-qualified technician for this operation. 

- Time required: 4 man-hours (application of Tl Ref 292 72 0840). 

2.6. Tooling and/or products 

2.6.1. At the operator's site 

- Mechanic's standard tooling. 

- Refer to Tl Ref 292 72 0839. 

2.6.2. By a maintenance Center 

- Mechanic's standard tooling. - Refer to Tl Ref 292 72 0840. 

2.7. Weight and balance 

Not applicable. 

2.8. Publication references 

Applicable variants: ARRIEL 1 B-0-01 §2- 517 

SB

_

292

_

72

_

0839

_

EN- C <June 18, 2014>- 7 I 11 
Important I Important notice (NORIA) : 

Apres application des instructions specifiees dans ce SB lmperatif, veuillez completer Ia presente 

attestation et Ia retourner aupres de votre coordinateur NORIA local par courrier ou courriel ou fax : se 

reporter au paragraphe 2.4.3. 

After application of the instructions specified in this Mandatory SB, please complete this certificate and return it to 

your local NO RIA coordinator by mail or email or fax: refer to paragraph 2.4.3. 

Information concernant le materiel / Equipment information 

Utilisateur 

Customer 

N/5 ·SIN 

Moteur Engine Module M01 

depose 

Removed 

module M01 

Module M01 

pose 

Installed module 

M01 

• TSN =Time Since New (Heures depuis neuf) 

CSN =Cycles Since New (Cycles depuis neuf) 

Ref.- PIN 

Operation effectuee par I Work performed by: 

N° Appareil 

Aircraft SIN 

TSN* rso· CSN* 

TSO = Time Since Overhaul (Heures depuis RG) 

CSO = Cycles Since Overhaul (Cycles depUis RG) 

Je certifie que le module identifie ci-dessus a ete installe selon les directives de ce SB lmperatif. 

CSO* 

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

SB. 

Date [JJIMMMM (en lettre)/AAAA 

ou/or DD/MMMM (letter)IYYYY] Nom /Name 

ANNEXE 2.1 / APPENDIX 2.1 

Signature: 

END of section §2 

Fonction I Job title 

"Application at the operator's site or by a Maintenance Center qualified for level 1, 2" 

Applicable variants: ARRIEL 1 B-D-01 §2 - 717 

SB 292 72 0839 EN- C <June 18, 2014> - 9 I 11 
END of section §4 

" Application by a TURBOMECA-approved Repair Center" 

Applicable variants: ARRIEL 1 B-D-01 §4- 1/1 

SB 292 72 0839 EN- C <June 18, 2014> - 11 I 11