§ SAFRAN 

Turbomeca 

40220 Tarnos • France 

Tel. +33 (0)5 59 74 40 00 - Telex 570 042- Fax +33 (0)5 59 74 4515 

ALERT 

MANDATORY SERVICE BULLETIN 

ARRIEL 2 No. A292 73 2847 

Subject: Hydro-Mechanical Unit (HMU). 

Replacement of the rotating components of the HP and LP 

pumps at 800 operating hours. 

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. 

SB_A292_73_2847 _EN - A <May 29, 2012> - 1 I 8 
ALERT 

MANDATORY SERVICE BULLETIN 

1. Compliance 

SB effectivity date * MAY2012 

* 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. 

CAUTION: FAILURE TO APPLY THIS MANDATORY 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. 

IARRIEL2D 

Validity Code 

1-B 

Conditions of application for engines in service 

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

a TURBOMECA-approved Maintenance Center 

Before the adjusted HMU has logged 800 operating hours since: 

-New. 

-Last application of Mandatory SB No. A292 73 2847. 

(2) Application at a TURBOMECA-approved Repair Center 

Upon first return, regardless of the reason for return, if the adjusted HMU has logged 

more than 600 operating hours since: 

-New. 

-Last application of Mandatory SB No. A292 73 2847. 

B. Purpose 

CAUTION: FAILURE TO APPLY THIS MANDATORY SB MAY LEAD TO AN UNCOMMANDED 

IN-FLIGHT ENGINE SHUT -DOWN WHICH, ON A SINGLE-ENGINE HELICOPTER, 

LEADS TO AN EMERGENCY AUTOROTATION LANDING. 

To prevent possible damage to the rotating components of the LP and HP fuel pumps. 

C. Description (see Figure) 

This procedure consists of removing and replacing the rotating components from the LP and 

HP fuel pumps of the adjusted HMU. 

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. 

SB_A292_73_2847 _EN- A <May 29, 2012>- 2 I 8 
ALERT 

MANDATORY SERVICE BULLETIN 

E. Manpower 

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

TURBOMECA-approved Maintenance Center 

(a) Personnel: 1 mechanic. 

(b) Time required: 40 man-minutes {removal and installation of HMU). 

(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 

Mechanic's standard tooling. 

(2) At a TURBOMECA-approved Repair Center 

Refer to the Component Maintenance Manual. 

H. Weight and balance 

Not applicable. 

I. References 

(1) ARRIEL 20 Maintenance Manual ............................................ Ref. X 292 R1 450 2. 

(2) ARRIEL 20 Overhaul Manual .................................................. Ref. X 292 R1 500 2. 

(3) Component Maintenance Manual .................................................. Ref. X 73 23 14 2. 

J . Other publications concerned 

(1) ARRIEL 20 Spare Parts Catalog ............................................. Ref. X 292 R1 700 2. 

(2) ARRIEL 20 Illustrated Parts Catalog ........................................ Ref. X 292 R1 600 2. 

SB_A292_73_2847 _EN- A <May 29, 2012>- 3/ 8 
ALERT 

MANDATORY SERVICE BULLETIN 

2. Instructions to be incorporated 

A. Implementation 

This procedure may be performed without 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 

Replace adjusted HMU. 

(2) At a TURBOMECA-approved Repair Center 

Replace rotating components of LP and HP pumps. 

B. Operating instructions 

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

TURBOMECA-approved Maintenance Center 

(a) Remove adjusted HMU: refer to Maintenance Manual, task 73-23-00-900-801 . 

(b) Return adjusted HMU, along with its updated log card, to a TURBOMECA-approved 

Repair Center. 

CAUTION: WHEN INSTALLING THE ADJUSTED HMU, THE COMPLETE SLEEVE MUST BE 

CLIPPED ONTO THE PUMP DRIVE SHAFT BEFORE INSTALLATION ON THE 

ACCESSORY GEARBOX. INCORRECT ASSEMBLY OF THE COMPLETE SLEEVE 

MAY LEAD TO AN UNCOMMANDED IN-FLIGHT ENGINE SHUT-DOWN. 

(c) Install adjusted HMU: refer to Maintenance Manual, task 73-23-00-900-801. 

(2) At a TURBOMECA-approved Repair Center 

(a) Remove adjusted HMU: refer to Overhaul Manual, task 72-00-00-030-842. 

(b) Replace rotating components of LP pump and HP pump that follow: refer to 

Component Maintenance Manual per type A+ repair. 

1 LP pump: 

1.1 Spindle wheel assembly. 

~ HP pump: 

2.1 Complete sleeve. 

2.2 Bearings/pinions matched assembly. 

2.3 Sleeve assembly. 

(c) Keep removed elements in quarantine storage. 

CAUTION:WHEN INSTALLING THE ADJUSTED HMU, THE COMPLETE SLEEVE MUST BE 

CLIPPED ONTO THE PUMP DRIVE SHAFT BEFORE INSTALLATION ON THE 

ACCESSORY GEARBOX. INCORRECT ASSEMBLY OF THE COMPLETE SLEEVE 

MAY LEAD TO AN UNCOMMANDED IN-FLIGHT ENGINE SHUT-DOWN. 

(d) Install adjusted HMU: refer to Overhaul Manual, task 72-00-00-430-820. 

C. Reconditioning and checks 

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

TURBOMECA-approved Maintenance Center 

Perform a ground run check: refer to Maintenance Manual, task 71 -02-13-280-801. 

(2) At a TURBOMECA-approved Repair Center 

Refer to the Overhaul Manual. 

SB_A292_73_2847 _EN -A <May 29, 2012>- 4 I 8 
ALERT 

MANDATORY SERVICE BULLETIN 

D. Identification 

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

TURBOMECA-approved Maintenance Center 

(a) Update the log card of the removed adjusted HMU and the log card of the installed 

adjusted HMU. 

(b) Record the replacement of the adjusted HMU in section "C" of the engine log book 

and integrate the log card of the installed adjusted HMU. 

(c) Return the removed adjusted HMU, along with its Jog card, to a TURBOMECAapproved Repair Center. 

(d) Notify TURBOMECA that the adjusted HMU has been replaced by returning the fully 

completed compliance certificate (Appendix 1 of this Mandatory SB). 

(2) At a TURBOMECA-approved Repair Center 

(a) Record the application of this Mandatory SB in the log card of the adjusted HMU. 

(b) Notify TURBOMECA that this Mandatory SB has been applied by returning the fully 

completed compliance certificate (Appendix 2 of this Mandatory SB). 

E. Routine maintenance 

Not applicable. 

SB_A292_73_2847 _EN- A <May 29, 2012>- 5 I 8 
ALERT 

MANDATORY SERVICE BULLETIN 

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 

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

TURBOMECA-approved Maintenance Center 

HMU. 

Refer to the Maintenance Manual for the spare parts related to the adjusted HMU 

replacement. 

{2) For a TURBOMECA-approved Repair Center 

Refer to the Overhaul Manual for the spare parts related to the adjusted HMU 

replacement. 

Refer to the Component Maintenance Manual for the spare parts related to the 

replacement of the components below. 

New Key Qty Description Part Number 

0 292 91 188 0 A 1 Spindle wheel assembly 

0 292 91 739 0 A 1 Complete sleeve 

0 292 91 059 0 A 1 Bearings/pinions 

matched assembly 

0 292 91102 0 A 1 Sleeve assembly 

Key 

A - Part required for the application of this Mandatory SB. 

C - Part deleted by the application of this Mandatory SB. 

C. Supply conditions 

Order supplies as needed from: 

your local TURBOMECA Support Center 

or 

TURBOMECA 

Direction Support Ventes Operateurs 

Departement Commercial 

40220 TARNOS 

France 

Fax No. +33 (0) 5 59 74 45 11. 

Old Key Part Number 

0 292 91 188 0 c 

0 292 91 739 0 c 

0 292 91 059 0 c 

0 292 91102 0 c 

Qty 

SB_A292_73_2847 _EN- A <May 29, 2012>- 6 I 8 
ALERT 

MANDATORY SERVICE BULLETIN 

Objet: Attestation de remplacement de !'ensemble pompes HP/BP 

doseur regie. 

Subject: Compliance certificate for replacement of adjusted HMU. 

Important I Important notice : 

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

attestation et Ia retourner par courrier ou courriel ou fax a : 

After application of the instructions specified in this Mandatory SB, please complete this certificate and mail or 

email or fax it to : 

TURBOMECA, Equipe Administration Base instalh~e I Fleet data administrator Team, BP 25 

40220 TARNOS- France 

Fax no I No. +33 (0) 5 59 74 46 95- Email : fleetdata@turbomeca.fr 

Information concernant le materiel / Equipment information 

Utilisateur 

Customer 

N/S- SIN 

Moteur 

Engine 

Ensemble pompes 

HPIBP doseur regie 

depose 

Removed adjusted 

HMU 

Ensemble pompes 

HP/BP doseur regie 

installe 

Installed adjusted HMU 

• TSN = Time Since Now (Heures depuis neuf) 

CSN = Cycles Since Now (Cycles depuis neuf) 

'

Operation effectuee par : 

Work performed by: 

No Appareil 

Aircraft SIN 

Ret. - P/N TSN* TSO* CSN* 

TSO = Time Since Overhaul (Heures depuis RG) 

CSO = Cycles Since Overhaul (Cycles depuis RG) 

cso• 

Je certifie que !'ensemble pompes HP/BP doseur regie identifie ci-dessus a ete installe selon les 

directives de ce SB lmperatif. 

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

Mandatory SB. 

Date [JJ f MMMM (en lettre) I AAAA 

or DD f MMMM (letter) f YYYY] 

ANNEXE 1 I APPENDIX 1 

Nom I Print name Fonction I Job title 

Signature: 

SB_A292_73_2847 _EN- A <May 29, 2012>- 7 I 8 
ALERT 

MANDATORY SERVICE BULLETIN 

Objet : Attestation d'application du SB lmperatif no A292 73 2847. 

Subject: Mandatory SB No. A292 73 284 7 compliance certificate. 

Important / Important notice : 

Apres application des instructions specifh!es dans ce SB lmperatif, veuillez completer Ia presente 

attestation et Ia retourner par courrier ou courriel ou fax a : 

After application of the instructions specified in this Mandatory SB, please complete this certificate and mail or 

email or fax it to : 

TURBOMECA, Equipe Administration Base installee I Fleet data administrator Team, BP 25 

40220 TARNOS - France 

Fax no I No. +33 (0) 5 59 74 46 95 · Email : fleetdata@turbomeca.fr 

Information concernant le materiel / Equipment information 

Utilisateur 

Customer 

NIS- SIN 

Moteur 

Engine 

Ensemble pompes 

BPIHP doseur regie 

controh~ 

Inspected adjusted 

HMU 

• TSN = Time Since New (Heures depuis neuf) 

CSN = Cycles Since New (Cycles depuis neuf) 

Operation effectuee par : 

Work performed by: 

N" Appareil 

Aircraft SIN 

Ref.- PIN TSW TSO' CSN* 

TSO = Time Since Overhaul (Heures depuis RG) 

CSO =Cycles Since Overhaul (Cycles depuis RG) 

cso· 

Je certifie que !'ensemble pompes HPIBP doseur regie identifie ci-dessus a ete controle selon les 

directives de ce SB lmperatif. 

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

SB. 

Date (JJ I MMMM (en lettre) I AAAA 

or DO I MMMM (letter) I YYYY] 

ANNEXE 2 I APPENDIX 2 

Nom I Print name Fonction I Job title 

Signature : 

SB_A292_73_2847 _EN - A <May 29, 2012>- 8 I 8