# § SAFRAN Tu rbo m eca 40220 Tarnos • France T el. +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 co rresponds to when all resources needed to perform the procedure (p arts , 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 I N-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 applicatio n 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) Thi s procedure consists of removing and replac i ng the rot ating components from the LP and HP fuel pumps of the adjusted HMU . D. Approval The technical information contained in this document has b een approved under the Des ign Organizatio n Approval No. EASA.21J.070 . This Mandatory SB is subject to an Airworthiness Directive .


## SB_A292

_ 73_2847 _EN- A <M ay 29, 2012>- 2 

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# ALERT 

# MANDATORY SERVICE BULLETIN E. Manpower (1) At th e o p e rator's site, at a TURBOMECA-approved Service Ce nter or at a TURBOMECA-approved Main t enance Ce nter (a) Pe rso n nel: 1 m echanic . (b) Time required: 

### 40 man - minutes { removal and installation of HMU) . 

### (2) At a TURBOMECA-app rove d Repair Ce nte r (a) Personnel of approved Repair Cent er. (b) T i me determined by the Repair Center as being appropri ate for this level of intervention. 

### F. Material Refe r to pa ragrap h 3. 

### G. Tooling (1) At the operator's site , at a TURBOMECA-approved Se rvice Ce n t er or at a TURBOMECA-approve d Ma i nte nance Cente r Mechanic's standard tooling. 

### (2) At a TURBOMECA-approved Repair Center R efer to the Component M ai ntenance M anua l. 

### H . Weight a nd balance Not app l icable. 

### I. References (1) ARR I E L 20 M ai nte nance Manua l ..... .. . . ......................... . ... ...... Ref. X 2 92 R 1 

### 450 2 . (2) ARRI E L 20 Ove rhau l M a nu a l ..... ..... ....... . . .. ... .... . .. .. ... .. ...... .. .... Ref. X 292 R1 

### 500 2 . (3 ) Compo n ent Maintenance M anua l .. ... . ............................................ Re f . X 73 23 14 2 . 

### J . Other p u blic at i ons conce rn ed (1) AR R IEL 20 Spare Parts Catalog ............................................. Ref . X 292 R1 

### 700 2. (2) ARRIE L 20 Illustrated Parts Catalog .......................... ..... .. ... .... Ref. X 292 R 1 

### 600 2.



## SB_A29 2_73 _2847

_ EN- A < May 2 9 , 2 012 >- 3/ 8

# ALERT 

# MANDATORY SERVICE BULLETIN 2. Instructions to be incorporated A . Implementation This procedure may be performed without removing the eng i ne f rom 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) R eturn adjusted HMU , along with its updated log card, to a TURB OM ECA-approved Repair Cente r. 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 adj u sted HMU : refe r to Main tena nce Manu a l , task 73-2 3-00-900 -80 1. 

### (2) At a TURBOMECA-approved Repair Center (a) Remove adjusted HMU : refer to Overhau l Manual , task 72 -00-00-030-842 . (b) R eplace rotating components of LP pump and H P pump that follow: refer to Component Maintenance Manual per type A+ repair . 

## 1 LP pump: 

### 1 . 1 Sp indle wheel asse mbly.**~** 

### HP pump: 2 . 1 Complete sleeve. 

### 2 .2 Bearings/pinions matched assemb ly . 2 .3 Sleeve assembly. (c) Keep re moved elements in quarantin e 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 Manu al , task 72-00-00-430-820. 

### C. Reconditioning and checks (1) At the operator's site, at a TURBOMECA-a pproved Service Center or at a TURBOMECA-approved Maintenance Center Perform a ground run c h ec k : refer to Maintenan ce M anu a l , task 71 -02- 1 3-28 0 - 80 1 . 

### (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 f u lly comp l eted compliance certificate (Appe ndix 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 th is 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-approve d 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 ofthis Mandatory SB.

C. Supply conditions Order supplies as needed from : your local TURBOMECA Support Center or TURBOMECA Direction Support Ventes Operateurs Departement Commercia l 

### 40220 TARNO S 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 

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# 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 Importa nt notice : Apre s application des instructions specifiees dans ce SB lmperatif , veuillez completer Ia presente attestation et Ia retourner par co urrier ou courr i e l ou f ax 

## a : After app l ication o f the instruct i ons specified in this Mandatory SB, p l ease complete this certificate and mail or ema i l 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@t urbome ca.f r Informati o n co ncernant le materiel / Equ i pment informati on Utilisateur Customer N/S- SIN Moteur Engine Ensemble pompes HPIBP doseur regie depose Removed adjusted HMU Ensemble pompes HP/BP doseur regi e in sta ll e Installed adjusted HMU • TSN = Tim e Since Now ( Heures depui s neuf) CS N = Cycles Since N ow (Cycles depu i s neuf)

' Op erati o n effectuee par : Work performed by : No Appareil Aircraft SIN Ret. - P/N TSN * TSO * CS N*

TSO = T i m e Since Overh aul (He ures depuis RG) CSO = Cycles Since Overhaul (Cycles depuis RG) 

### cso•

Je certifie qu e ! 'e nsemble pompes HP/BP doseur regi e identifie ci-dessus a ete in sta lle se lon le s dire ctives de ce SB lmperatif. I cert ify that the above-men ti oned adjusted HMU has been i nstalled 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 P r i nt name Fonction I Job title

Signature:



## SB_A292_73_2847 _EN- A < May 29, 2012 >- 7 

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# ALERT 

# MANDATORY SERVICE BULLETIN Objet : Attestation d ' application du SB lmperatif n o A292 73 2847. Subje ct: Mand ato ry SB No . A292 73 2 84 7 compliance ce rtif icate . Importa n t / I m po rta nt not ice : Apres appli c at ion d es in structions specifh!es d a n s ce SB lmperatif , v eui ll ez co mpleter I a p resente attest ati o n et I a ret o urne r par co u rri e r o u c ourri e l o u fax 

## a : Afte r a p plication of the instruct ions s pecified i n t his Mandato ry S B , p l ease complete this certificate and mail or e m ail or fax it to : T U RBO M ECA , Eq u i p e A d m i n ist ration Bas e insta ll ee I Fleet data ad minist rato r Tea m, BP 25 40220 TA RNOS - F ran ce Fax n o I N o . + 33 (0 ) 5 59 7 4 4 6 95 · Ema il : fleetdat a @turb o m e ca .f r Information con cernant l e mate riel / E quipment information Ut i l i s ateur Customer NI S- SIN Moteur En gine Ensemb l e pomp es BPI H P doseu r reg i e**controh~** Inspected adjusted 

### HMU • TS N = T ime Si n ce N ew (Heures depuis neuf) CS N = Cycles Si n ce N ew (Cycles depui s neuf) Operation effe ctu ee par : Work performed by : N" Appa re i l Aircraft SIN Ref .- P I N TSW TSO' CSN*

T SO = Ti m e Since Over h aul (Heures depuis RG) CSO =Cyc le s S ince Ove r ha ul (Cycl es depuis RG ) 

### cso·

J e cert ifi e qu e ! 'en s emb l e pompes H PI BP dose ur re g i e i de nti fie ci-de ss u s a et e con t ro l e se l on l es di rectives d e ce SB l mperat i f. I certify that the above-mentioned HM U has been inspected according to t h e directives given in t h is M andatory S B. Date (JJ I MMMM (en lettre) I AAAA

or DO I MMMM (le tter) I YYYY]



### ANN E X E 2 

### I APPE N D I X 2 N o m I Pri nt name Fo n cti o n I Job title



### S i g n ature :



## SB_A292

_ 73_2847

_ E N - A < May 29 , 2012>- 8 

# I 8