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 

ARRIEL 1 No. 292 73 0817

Subject: Fuel Control Unit (FCU). Inspection of plug installed on 

3-way union. 

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

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

Version: C 

Reason for update: Additional information. 

Version B of this Service Bulletin has never been 

distributed.

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MANDATORY SERVICE BULLETIN 

1. Compliance 

Service Bulletin effectivity date * JANUARY 2008 

* Date by which the conditions of application for the Service Bulletin must systematically be 

complied with. 

This date corresponds to when sufficient resources required to incorporate the Service Bulletin 

(parts, tools, documentation, etc.) will be available. 

If these resources are available any earlier, the Service Bulletin may, as an exception, be 

incorporated prior to the effectivity date. 

CAUTION: FAILURE TO INCORPORATE THIS MANDATORY SERVICE BULLETIN MAY LEAD TO AN 

UNCOMMANDED IN-FLIGHT SHUTDOWN.

A. Application 

Incorporation of this Service Bulletin 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 1 E2 engines 

ARRIEL 1 S - 1 S1 engines 1-A 

Conditions of application for engines in service 

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

Within "100" operating hours (starting when the mandatory Service Bulletin is received).

(2) Application at a TURBOMECA-approved Repair Center 

Before delivery.

B. Purpose 

To prevent a high pressure leak (i.e. at the fuel pump outlet) that could lead to an in-flight 

flame-out and/or possibly a fire. 

C. Description (see Figure)

This procedure consists of checking the conformity of the plug installed on the FCU 3-way 

union, and of inspecting its apparent tightening torque which must be between 1.3 and 

1.5 daN.m. 

D. Approval 

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

Organization Approval No. EASA.21J.070. 

This mandatory Service Bulletin is subject to an Airworthiness Directive. 

E. Manpower 

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

(a) Personnel: 1 mechanic.

(b) Time required: 0.5 man-hour.

(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. 

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MANDATORY SERVICE BULLETIN 

G. Tooling 

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

(a) Mechanic's standard tooling. 

(b) Torque wrench to inspect torque. 

(2) At a TURBOMECA-approved Repair Center 

Refer to the ARRIEL 1 Repair Manual.

H. Weight and balance 

Not applicable. 

I. References 

(1) ARRIEL 1 E2 Maintenance Manual........................................... Ref. X 292 M3 452 2. 

(2) ARRIEL 1 S Maintenance Manual............................................. Ref. X 292 F9 452 2. 

(3) ARRIEL 1 S1 Maintenance Manual........................................... Ref. X 292 H4 452 2. 

(4) ARRIEL 1 Repair Manual .......................................................... Ref. X 292 87 500 2. 

J. Other publications concerned 

(1) ARRIEL 1 E2 Spare Parts Catalogue........................................ Ref. X 292 M3 702 2. 

(2) ARRIEL 1 S Spare Parts Catalogue.......................................... Ref. X 292 F9 702 2. 

(3) ARRIEL 1 S1 Spare Parts Catalogue........................................ Ref. X 292 H4 702 2. 

(4) ARRIEL 1 E2 Illustrated Parts Catalogue.................................. Ref. X 292 M3 602 2. 

(5) ARRIEL 1 S Illustrated Parts Catalogue.................................... Ref. X 292 F9 602 2. 

(6) ARRIEL 1 S1 Illustrated Parts Catalogue.................................. Ref. X 292 H4 602 2. 

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MANDATORY SERVICE BULLETIN 

2. Instructions to be incorporated 

A. Implementation 

This inspection may be performed without removing the engine from the helicopter. 

This procedure can be performed: 

(1) By checking plug and replacing it if necessary. 

(2) By inspecting apparent tightening torque. 

B. Operating instructions 

(1) Identify plug installed on 3-way union (see Figure). 

Note: The compliant plug can be equipped with different types of circlips. 

(2) If plug is compliant (P/N 9 932 30 706 0) 

(a) Inspect tightening torque with torque wrench adjusted to between 1.3 and 

1.5 daN.m. Torque to correct value if necessary. 

(b) Notify TURBOMECA that plug tightening is compliant by returning the fully 

completed compliance certificate (Appendix 1 of this mandatory Service Bulletin) 

(3) If plug is not compliant 

Notify TURBOMECA that plug is not compliant by returning the fully completed 

compliance certificate (Appendix 1 of this mandatory Service Bulletin). 

Upon receipt of compliant plug sent by TURBOMECA: 

(a) Remove non-compliant plug from 3-way union and discard. 

(b) Install compliant plug (P/N 9 932 30 706 0) on 3-way union. 

(c) Tighten plug to apparent torque between 1.3 and 1.5 daN.m. 

C. Reconditioning and checks 

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

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

task 71-02-13-280-801.

(2) At a TURBOMECA-approved Repair Center 

Refer to the ARRIEL 1 Repair Manual.

D. Identification 

(1) Plug is compliant 

(a) Complete the following section in the current or unique engine log book: 

- Section "E": Record the incorporation of mandatory Service Bulletin 

No. 292 73 0817.

(b) Update the FCU log card by recording the incorporation of this mandatory Service 

Bulletin. 

(2) Plug is not compliant 

(a) Complete the following section in the current or unique engine log book: 

- Section "E": Record the replacement of the non-compliant plug. 

(b) Update the log card of the modified FCU. 

(c) Notify TURBOMECA that the non-compliant plug has been replaced by returning the 

fully completed compliance certificate (Appendix 2 of this mandatory Service 

Bulletin). 

E. Routine maintenance 

Not applicable. 

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MANDATORY SERVICE BULLETIN 

3. Material information 

A. Basic information 

The parts list (provided below) required for the incorporation of this mandatory Service 

Bulletin is for one engine. 

B. List of parts 

New 

Part Number Key Qty Description Price Old Part Number Key Qty

9 932 30 706 0 A 1 Sealing plug

(73-21-00-02-010) * 

* Prices available upon request.

Key 

A - Part required for the incorporation of this mandatory Service Bulletin. 

C - Deleted part.

C. Supply conditions 

Supply of parts will be managed by: 

TURBOMECA 

DSO/RP NORIA 

40220 TARNOS - France 

Fax No. +33 (0) 5 59 74 45 72. 

Noria Team at Sydney for Australasia 

Phone : + 61 2 9796 6654 

Fax : + 61 2 9796 6624. 

Noria Team at Dallas for the Americas 

Phone : + 1 972 606 76 15 

Fax : + 1 972 606 76 68. 

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MANDATORY SERVICE BULLETIN 

73-21-00-02-010 

FIGURE / FIGURE 

A

Bouchon conforme 

Compliant plug

Détail A / Detail A

Variantes existantes / Existing variants

Bouchon non-conforme (exemple)

Non-compliant plug (example)

Pour information (Régulateur de 

carburant ARRIEL 1 E2) 

For information (ARRIEL 1 E2 FCU)

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MANDATORY SERVICE BULLETIN 

Objet : Attestation de contrôle du bouchon.

Subject: Compliance certificate for checking of plug. 

Important / Important notice: Après application de ce Service Bulletin impératif, veuillez compléter la présente attestation et la 

retourner par courrier ou fax à : 

After incorporating the instructions in this mandatory Service Bulletin, please complete this certificate and mail 

or fax it to: 

For Africa, Europe, Middle East 

TURBOMECA Tarnos 

DSO/RP NORIA 

40220 TARNOS – France 

Fax n° + 33 (0)59 74 45 72 

For the Australasia 

Noria Team Sydney 

115 Wackett St, Bankstown Airport

Bankstown, NSW 220 - Australia 

Fax n° + 61 2 9796 6624 

For the Americas 

Noria Team Dallas 

2709 Forum Drive 

Grand Prairie, TX 75052 – USA 

Fax n° + 1 972 606 76 68 

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 

 

Régulateur carburant 

contrôlé 

Inspected FCU

* 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) 

Résultat du contrôle (cocher la case correspondante) 

Inspection result : tick the corresponding box 

Bouchon à remplacer

Plug to be replaced

Couple de serrage contrôlé

Tightening torque inspected

Oui 

Yes

Non 

No

Conforme

Compliant 

Non-conforme 

Not compliant 

Opération effectuée par : 

Work performed by: 

.................................................................................................................................................................................

Je certifie que le régulateur identifié ci-dessus a été contrôlé selon les directives du Service Bulletin 

impératif en objet. 

I certify that the above-mentioned FCU has been inspected according to the directives given in this mandatory 

Service Bulletin. 

Date Nom / Print name Fonction / Job title 

.................................................................................................................................................................................

Signature:

ANNEXE 1 / APPENDIX 1 

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MANDATORY SERVICE BULLETIN 

Objet : Attestation de remplacement du bouchon non conforme.

Subject: Compliance certificate for the replacement of a non-compliant plug.

Important / Important notice: Après application de ce Service Bulletin impératif, veuillez compléter la présente attestation et la 

retourner par courrier ou fax à : 

After incorporating the instructions in this mandatory Service Bulletin, please complete this certificate and mail 

or fax it to: 

For Africa, Europe, Middle East 

TURBOMECA Tarnos 

DSO/RP NORIA 

40220 TARNOS – France 

Fax n° + 33 (0)59 74 45 72 

For the Australasia 

Noria Team Sydney 

115 Wackett St, Bankstown Airport

Bankstown, NSW 220 - Australia 

Fax n° + 61 2 9796 6624 

For the Americas 

Noria Team Dallas 

2709 Forum Drive 

Grand Prairie, TX 75052 – USA 

Fax n° + 1 972 606 76 68 

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 

 

Régulateur carburant 

modifié 

Modified FCU

Bouchon déposé 

Removed plug

 

Bouchon posé 

Installed plug

 

* 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 régulateur identifié ci-dessus a été installé selon les directives du Service Bulletin 

impératif en objet. 

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

Service Bulletin. 

Date Nom / Print name Fonction / Job title 

.................................................................................................................................................................................

Signature:

ANNEXE 2 / APPENDIX 2 

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