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

ARRIUS 2 No. 319 73 2825

Subject: Visual inspection of adju sted HMU drive-link splines.

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



## Version: G

Reason for update:

- Changes to the conditions of appli cation, for engines in service, at the operator's site, at a Service Cen ter or at a Maintenance Center.

- Inspection criteria added for the sleeve assembly.



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# MANDATORY SERVICE BULLETIN

1. Compliance

SB effectivity date * FEBRUARY 2005

 Date on which this Mandatory SB becomes effective and must systematically be complied with, according to the conditions of application. 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.



### A. Application

Application of this Mandatory Service Bulletin (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.

Validity Code

ARRIUS 2B1 - 2B1A (post TU 45C) - 2B2

ARRIUS 2K1 - 2K2

ARRIUS 2G1 1-A

Note: For post TU 45C ARRIUS 2 B1A engines, the engine variant marked on the identification plate is ARRIUS 2B1A_1. The engine type remains ARRIUS 2 B1A.

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 The conditions of application of this Mandatory SB are given in the table below:

Conditions of application Maintenance task to be performed Deadline for application (2)

If the HMU has logged

more than 500 hours since the last application
of SB No. 319 73 2825 Within 200 hours of receiving this SB and then every 500 HMU operating

hours (1)

SB No. 319 73 2825 already applied to the

HMU If the HMU has logged

less than 500 hours since the last application
of SB No. 319 73 2825. Every 500 HMU operating

hours (1)

The HMU has operated

for less than 200 hours

since new (TSN) or since overhaul (TSO) At 200 hours (HMU TSN or TSO) and then every 500 HMU operating hours (1)

SB No. 319 73 2825 never applied to the

HMU The HMU has operated

for more than 200 hours since new (TSN) or since overhaul (TSO) Visual inspection and cleaning of adjusted HMU drive-link splines

and sending of the

results

Within 50 hours of receiving

this SB and then every 500

HMU operating hours (1)



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# MANDATORY SERVICE BULLETIN

(1) : This 500-hour frequency must be considered as a maximum. An inspection deadline can be reduced to synchronize this inspection with an engine/airframe inspection.

(2) : a 10% tolerance can be applied to the defined inspection frequencies. This tolerance cannot be cumulated during two successive inspection deadlines. (2) Application at a TURBOMECA-approved Repair Center Upon first return to an approved Repair Center, regardless of the reason for return.



### B. Purpose To avoid an uncommanded in-flight engine shut-down caused by damage to the adjusted HMU drive-link splines.



### C. Description Visual inspection to check the condition of the HP pump drive gear shaft splines, cleaning and inspection of the sleeve assembly splines.



### 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.



### E. Manpower (1) Application 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: 1 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.



### G. Tooling (1) Application 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 relevant ARRIUS 2 Overhaul Manual and Component Maintenance Manual.



### H. Weight and balance Not applicable.



### I. References (1) ARRIUS 2 B1 Maintenance Manual .......................................... Ref. X 319 L5 301 2. (2) ARRIUS 2 B1A Maintenance Manual........................................ Ref. X 319 L5 451 2. (3) ARRIUS 2B2 Maintenance Manual ........................................... Ref. X 319 N3 451 2. (4) ARRIUS 2K1 Maintenance Manual ........................................... Ref. X 319 N1 300 2. (5) ARRIUS 2K2 Maintenance Manual ........................................... Ref. X 319 N0 452 2. (6) ARRIUS 2G1 Maintenance Manual........................................... Ref. X 319 R4 450 2. (7) ARRIUS 2B1 - 2B1A Overhaul Manual ..................................... Ref. X 319 L5 500 2. (8) ARRIUS 2B2 Overhaul Manual ................................................. Ref. X 319 N3 500 2.



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# MANDATORY SERVICE BULLETIN

(9) ARRIUS 2K1 Overhaul Manual ................................................. Ref. X 319 N1 500 2. (10) ARRIUS 2K2 Overhaul Manual ................................................. Ref. X 319 N0 500 2. (11) ARRIUS 2G1 Overhaul Manual................................................. Ref. X 319 R4 500 2. (12) ARRIUS 2B1 Component Maintenance Manual........................ Ref. 73-23-02 2. (13) ARRIUS 2B1 - 2B1A Component Maintenance Manual............ Ref. 73-23-07 2. (14) ARRIUS 2B2 Component Maintenance Manual........................ Ref. 73-23-11 2. (15) ARRIUS 2K1 Component Maintenance Manual........................ Ref. 73-23-12 2. (16) ARRIUS 2K2 Component Maintenance Manual........................ Ref. 73-23-15 2. (17) ARRIUS 2G1 Component Maintenance Manual ...................... Ref. 73-23-19.



### J. Other publications concerned (1) ARRIUS 2B1 Spare Parts Catalog ............................................ Ref. X 319 L5 701 2. (2) ARRIUS 2B1A Spare Parts Catalog.......................................... Ref. X 319 L5 702 2. (3) ARRIUS 2B2 Spare Parts Catalog ............................................ Ref. X 319 N3 700 2. (4) ARRIUS 2K1 Spare Parts Catalog ............................................ Ref. X 319 N1 700 2. (5) ARRIUS 2K2 Spare Parts Catalog ............................................ Ref. X 319 N0 700 2. (6) ARRIUS 2G1 Spare Parts Catalog............................................ Ref. X 319 R4 700 2. (7) ARRIUS 2B1 Illustrated Parts Catalog ...................................... Ref. X 319 L5 601 2. (8) ARRIUS 2B1A Illustrated Parts Catalog.................................... Ref. X 319 L5 602 2. (9) ARRIUS 2B2 Illustrated Parts Catalog ...................................... Ref. X 319 N3 600 2. (10) ARRIUS 2K1 Illustrated Parts Catalog ...................................... Ref. X 319 N1 600 2. (11) ARRIUS 2K2 Illustrated Parts Catalog ...................................... Ref. X 319 N0 600 2. (12) ARRIUS 2G1 Illustrated Parts Catalog..................................... Ref. X 319 R4 600 2.



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# MANDATORY SERVICE BULLETIN

2. Instructions to be incorporated

A. Implementation This inspection may be performed without removing the engine. (1) Application at the operator's site, at a TURBOMECA-approved Service Center or at a TURBOMECA-approved Maintenance Center Visually inspect HP pump drive gear sha ft splines, clean and inspect sleeve assembly splines. (2) At a TURBOMECA-approved Repair Center Visually inspect HP pump drive gear sha ft splines, clean and inspect sleeve assembly splines.



### B. Operating instructions (see Figures) (1) Application at the operator's site, at a TURBOMECA-approved Service Center or at a TURBOMECA-approved Maintenance Center (a) Remove adjusted HMU: refer to relevant ARRIUS 2 Maintenance Manual,

task 73-23-00-900-801.

Nota : For post TU 38A engines, do not remove flanged union. (b) Remove sleeve assembly: refer to relevant ARRIUS 2 Maintenance Manual,

task 73-23-00-200-801. (c) Clean and inspect removed sleeve assembly: refer to relevant ARRIUS 2 Maintenance Manual, tasks 73-23-00-200-801 and 70-01-00-940-801 (“cleaning” paragraph). Additional inspection : in addition to inspections of task 73-23-00-200-801, make sure there are no deposits (whatever the type: grease or other) at the bottom of sleeve assembly female splines.

 If deposits are found at the bottom of sleeve assembly female splines, replace sleeve assembly, and install new retaining ring on HP pump drive gear shaft and on sleeve assembly. (d) Inspect adjusted HMU: refer to relevant ARRIUS 2 Maintenance Manual,

task 73-23-00-200-801. (e) Record equipment inspection results in appendix 2 of this Mandatory SB. (f) Install sleeve assembly on HP pump drive gear shaft: refer to relevant ARRIUS 2 Maintenance Manual, task 73-23-00-200-801. (g) Install adjusted HMU: refer to relevant ARRIUS 2 Maintenance Manual,

task 73-23-00-900-801. (2) At a TURBOMECA-approved Repair Center Refer to the relevant ARRIUS 2 Overhaul Manual and Component Maintenance Manual.



### C. Reconditioning and checks (1) Application 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 relevant ARRIUS 2 Maintenance Manual,

task 71-02-13-280-801. (2) At a TURBOMECA-approved Repair Center Refer to the relevant ARRIUS 2 Overhaul Manual and Component Maintenance Manual.



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# MANDATORY SERVICE BULLETIN

D. Identification (1) Application at the operator's site, at a TURBOMECA-approved Service Center or at a TURBOMECA-approved Maintenance Center (a) If adjusted HMU was not replaced

1 Complete the current or unique engine log book as follows:

- Record the application of Mandatory SB No. 319 73 2825 on the log card of the adjusted HMU.

2 Notify TURBOMECA that Mandatory SB No. 319 73 2825 has been applied by returning the fully completed compliance certificate (Appendix 2 of this Mandatory SB). (b) If adjusted HMU was replaced:

1 Complete the following sections in the current or unique engine log book:

- Update the log card of the removed adjusted HMU and the log card of the installed adjusted HMU.

- Section "C": Record the replacement of the adjusted HMU and integrate the log card of the installed adjusted HMU.

2 Return the removed adjusted HMU to a TURBOMECA-approved Repair Center.

3 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) Complete the current or unique engine log book as follows:

- Record the application of Mandatory SB No. 319 73 2825 on the log card of the

adjusted HMU. (b) Notify TURBOMECA that Mandatory SB No. 319 73 2825 has been applied by returning the fully completed compliance certificate (Appendix 2 of this Mandatory SB).



### 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 application of this Mandatory SB is for one engine.



### B. List of parts

New

Part Number Key Qty Description Price Old

Part Number Key Qty

9 745 00 800 5 B 1 Retaining ring of sleeve assembly *

0 319 91 134 0 B 1 Retaining ring of HP pump drive gear shaft *

0 319 91 732 0 B 1 Sleeve assembly *

* Prices available upon request.

Key

B - Part not incorporated by this inspection, but required for the inspection to be performed.



### C. Supply conditions Order supplies as needed from: your local TURBOMECA Support Center

or TURBOMECA
Direction Support Ventes Opérateurs
Département Commercial

40220 TARNOS

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



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# MANDATORY SERVICE BULLETIN

FIGURE Manchon complet Sleeve assembly Arbre pignon menant de la pompe HP Drive gear shaft of the HP pump



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# MANDATORY SERVICE BULLETIN

Objet : Attestation de remplacemen t de l'ensemble pompe/doseur réglé. Subject: Compliance certificate fo r replacement of adjusted HMU.

Important / Important notice : Après application des instructions spécifiées dans ce SB Impératif, veuillez compléter la présente attestation et la retourner par courrier ou courriel ou fax à : 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 installée / Fleet Data Administrator Team , BP 25
40220 TARNOS - France

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

Utilisateur

Customer N° Appareil

Aircraft S/N

N/S - S/N Réf. - P/N TSN * TSO * CSN* CSO*

Moteur Engine

Ensemble pompe/ doseur réglé déposé Removed adjusted HMU

Ensemble pompe/ doseur réglé posé Installed adjusted HMU

* 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 l'ensemble pompe/doseur réglé identifié ci-dessus a été installé selon les directives de ce SB Impératif. I certify that the above-mentioned adjusted HMU has been inst alled according to the directives given in this Mandatory SB.

Date [ JJ / MMMM (en lettre) / AAAA or DD / MMMM (letter) / YYYY] Nom / Print name Fonction / Job title

ANNEXE 1 / APPENDIX 1 Signature :



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# MANDATORY SERVICE BULLETIN

Objet : Attestation d’application du SB Impératif n° 319 73 2825 et résultats d’inspection Subject: Mandatory SB No. 319 73 2825 compliance certificate and inspection results

Important / Important notice : Après application des instructions spécifiées dans ce SB Impératif, veuillez compléter la présente attestation et la retourner par courrier ou courriel ou fax à : 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 installée / Fleet Data Administrator Team , BP 25
40220 TARNOS - France

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

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 01

Module 01

Ensemble pompe/
doseur contrôlé Inspected adjusted

HMU

Heures depuis pose de l’ensemble pompes HP/BP sur le module 01

Time since installation of HMU on

module 01

* 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)

Type et localisation des endommagements / Type and location of damage

1. Cannelures de l’arbre pignon menant de la pompe HP / HP pump drive gear shaft splines



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# MANDATORY SERVICE BULLETIN

Localisation des constatations : 01 cannelures / Damage location: 01 splines

Résultats du contrôle (cocher la case correspondante) Inspection result: check the corresponding box Conforme Compliant Non conforme Not compliant

Corrosion / Corroded

Impact / Impact

Ecaillage / Scalling

Arrachement / Stripped

Usure de frottement perceptible au toucher / Fretting perceptible by touch

Autre / other

Si non conforme, préciser la non-conformité If not compliant, describe the non-compliance

2. Cannelures mâle du manchon complet / Sleeve assembly male splines

Localisation des constatations: 02 cannelures / Damage location: 02 splines

Résultats du contrôle (cocher la case correspondante) Inspection result: check the corresponding box Conforme Compliant Non conforme Not compliant

Corrosion / Corroded

Impact / Impact

Ecaillage / Scalling

Arrachement / Stripped

Usure de frottement perceptible au toucher / Fretting perceptible by touch

Autre / other

Si non conforme, préciser la non-conformité If not compliant, describe the non-compliance



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# MANDATORY SERVICE BULLETIN

3. Cannelures femelle du manchon complet / Sleeve assembly female splines

Localisation des constatations: 03 cannelures / Damage location: 03 splines

Résultats du contrôle (cocher la case correspondante) Inspection result: check the corresponding box Conforme Compliant Non conforme Not compliant

Corrosion / Corroded

Impact / Impact

Ecaillage / Scalling

Arrachement / Stripped

Résidu (tous types) en fond de cannelures / Deposits (all types) on splines bottom

Autre / other

Si non conforme, préciser la non-conformité If not compliant, describe the non-compliance

Opération effectuée par : Work performed by:

Je certifie que l'ensemble pompe/doseur réglé identi fié ci-dessus a été inspecté selon les directives de ce SB Impératif. I certify that the above-mentioned adjusted HMU has been insp ected according to the directives given in this Mandatory SB.

Date [ JJ / MMMM (en lettre) / AAAA or DD / MMMM (letter) / YYYY] Nom / Print name Fonction / Job title

ANNEXE 2 / APPENDIX 2 Signature :



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