Approved under EASA DOA No. 21J.056 Page 1/12

2010.12.09
This document is available on the internet: www.eurocopter.com/techpub EUROCOPTER

DIRECTION TECHNIQUE SUPPORT
13725 MARIGNANE C EDEX F RANCE



# EMERGENCY 

# ALERT SERVICE BULLETIN

DAUPHIN NUMBER VERSIONS 

# EC155 05A017 Civil : B-B1

SUBJECT: 

### TIME LIMITS – MAINTENANCE CHECKS

Fittings Attaching the Upper Fin on the Fenestron



### ATA : 53

REVISION No. DATE OF APPROVAL DATE OF ISSUE

Revision 0 On: September 28, 2007 2007.09.28 Revision 1 On: January 26, 2010 2010.01.27 Revision 2 On: December 03, 2010 2010.12.09Approved under EASA DOA No. 21J.056 Page 2/12

2010.12.09 

### 1. PLANNING INFORMATION

1.A. EFFECTIVITY

1.A.1. Helicopters/Installed equipment

Upper and lower fittings P/N 365A234242-01, 365A234243-01, 365A234240-01 and 365A234241-01, attaching the upper fin on the Fenestron pre MOD 0754B40.



### NOTE 1

The purpose of modification MOD 0754B40 is to increase the strength of the shroud/fin junction fittings. Modification 0754B40 is embodied on new helicopters or as a

retrofit action in accordance with Service Bulletin 53-029. Refer to the aircraft individual inspection record (MOD record), to identify the actual conf iguration of the helicopter.

1.A.2. Non-installed equipment

Not applicable.



### 1.B. ASSOCIATED REQUIREMENTS

Not applicable.Approved under EASA DOA No. 21J.056 Page 3/12

2010.12.09 

### 1.C. REASON

To make sure that there is no crack in the upper and lower fittings attaching the upper fin on the

Fenestron.

Revision 0 of this ALERT SERVICE BULLETIN form ed the subject of EASA Airworthiness Directive

No. 2007-0259-E.

The purpose of Revision 1 of this ALERT SERVICE BULLETIN which formed the subject of Revision 1

of EASA Airworthiness Directiv e No. 2007-0259-E, was to: - cancel the compliance instructions in paragraph 1.E.2.a. for AS365 (N1, N2, N3, F, Fi and K), AS565

and SA366 helicopter versions, and reference made to the associated Work Cards, - modify the time requirement for initial complian ce with paragraph 1.E.2.a. for EC155 helicopters, - specify the inspection areas and add the e-mail contact address to paragraph 2.B.2.

Revision 1 of this ALERT SERVICE BULLETIN did not affect compliance with Revision 0.

The purpose of Revision 2 of this ALERT SERVICE BULLETIN is to: - Prohibit flight with fittings P/N 365A234242-01, 365A234243-01, 365A234240-01

and 365A234241-01 (PRE MOD 0754B40) on EC155 version B and B1 helicopters, from December 31, 2011. - To inform the operators that compliance with Serv ice Bulletin No. 53-029 make possible to overcome

the restriction prohibiting flight with fitti ngs P/N 365A234242-01, 365A234243-01, 365A234240-01 and 365A234241-01 and relieves from obligation of co mpliance to this ALERT SERVICE BULLETIN.

Revision 2 of this ALERT SERVICE BULLETIN w ill form the subject of an EASA Airworthiness

Directive. Revision 2 of this ALERT SERVICE BULLETIN does not affect compliance with Revision 1.



### 1.D. DESCRIPTION

Revision 0 : In TELEX INFORMATION No. 00000414, dated September 13, 2007, EUROCOPTER informed you of the loss of a fin from an EC155 B1 helicopter in fligh t, as well as of a crack discovered recently in the fittings attaching the fin on the Fenestron.

Pending the results of the analysis of these in cidents, EUROCOPTER had introduced a periodic condition check of the fittings attaching the upper fin on EC155 helicopters, as well as on AS365, AS565 and SA366 helicopters which are fitted with the same fin definition, although they are subject to

lower loads than those on the EC155.

Revision 1 : Given the results of the analyses of the causes of this incident, conducted at EUROCOPTER, AS365, AS565 and SA366 helicopter versions can be delet ed from this ALERT SERVICE BULLETIN. Consequently, only EC155 helicopters are concerned by the instructions given in Revision 1 of this

ALERT SERVICE BULLETIN.

EUROCOPTER is currently studying an improvement of the design of the fittings attaching the upper fin, in order to cancel the chec k carried out on EC155 helicopters.Approved under EASA DOA No. 21J.056 Page 4/12

2010.12.09 Revision 2:

EUROCOPTER has now defined new shroud/fin junction fittings through modification MOD 0754B40 whose purpose is to increase the strength of the fittings. This modification creates new fitting part numbers an d makes it possible to ov ercome the restriction prohibiting flight with fittings 365A234242- 01, 365A234243-01, 365A234240-01 and 365A234241-01 from December 31, 2011, stipulated by Re vision 2 of this ALERT SERVICE BULLETIN. Revision 2 of this ALERT SERVICE BULLETIN specif ies that helicopters post MOD 0754B40 are not concerned by the instructions of this ALERT SERVICE BULLETIN

EUROCOPTER renders compliance with the instru ctions of Revision 2 of this ALERT SERVICE BULLETIN, mandatory.



### 1.E. COMPLIANCE

EUROCOPTER renders compliance with th is ALERT SERVICE BULLETIN mandatory.

1.E.1. Compliance at the works

1.E.1.a. On helicopters: Comp ly with paragraph 1.E.2.a.

1.E.1.b. On non-installed equipment: Not applicable.

1.E.2. Compliance in operation: By the operator

1.E.2.a. On helicopters / installed equipment:

1) From receipt of Revision 1 of this ALERT SERVICE BULLETIN which was issued on January 27, 2010:

a) On helicopters with less than 40 flying hours :

- Comply with paragraph 2.B. of this ALERT SERVICE BULLETIN when the helicopter

reaches 55 flying hours following receipt of Revision 1 which was issued on January 27, 2010,
Then, - Comply with paragraph 2.B. at inte rvals not exceeding 55 flying hours.

b) On helicopters with 40 flying hours or more:

- Comply with paragraph 2.B of this AL ERT SERVICE BULLETIN within 15 flying hours

following receipt of Revision 0 which was issued on September 28, 2007,
Then, - Comply with paragraph 2.B. at inte rvals not exceeding 55 flying hours.



### NOTE 1

If the operating hours of the fittings are unknown, take into account the hours logged by the airframe of the helicopter.Approved under EASA DOA No. 21J.056 Page 5/12

2010.12.09 2) To prohibit flight with fittings P/ N 365A234242-01, 365A234243-01, 365A234240-01 and 365A234241-01 from December 31, 2011.



### NOTE 2

Compliance with Service Bulletin No. 53-029 enables the operators to overcome the restrict ion prohibiting flight with the fittings referenced above.

1.E.2.b. On non-installed equipment: Not applicable.



### 1.F. APPROVAL

The technical information contained in this AL ERT SERVICE BULLETIN Revision 0 was approved on September 28, 2007 under the authority of EASA Design Organisation A pproval No. 21 J.056 for civil version helicopters subject to an Airworthiness Certificate.

The technical information contained in this AL ERT SERVICE BULLETIN Revision 1 was approved on January 26, 2010 unde r the authority of EASA De sign Organisation Approval No. 21 J.056 for civil version helicopters subject to an Airworthiness Certificate.

The technical information contained in this AL ERT SERVICE BULLETIN Revision 1 was approved on January 26, 2010 by the EUROCOPTER Airworthines s Department for military version helicopters.

The technical information contained in this AL ERT SERVICE BULLETIN Revision 2 was approved
on December 03, 2010 under the autho rity of EASA Design Organisation Approval No. 21 J.056 for civil version helicopters subject to an Airworthiness Certificate.

The technical information contained in this AL ERT SERVICE BULLETIN Revision 2 was approved on December 03, 2010 by the EUROCOPTER Airworth iness Department for export military versions.



### 1.G. MANPOWER

Qualification: Mechanic or ai rcraft structure technician.

Time for the operations: Approximately 1 hour.



### 1.H. WEIGHT AND BALANCE

Not applicable.Approved under EASA DOA No. 21J.056 Page 6/12

2010.12.09 

### 1.I. EFFECT ON ELECTRICAL LOADS

Not applicable.



### 1.J. SOFTWARE MODIFICATION EMBODIMENT STATE

Not applicable.



### 1.K. REFERENCES

Aircraft Maintenance Manual (AMM), Tasks: 53-91-00-061, 53-91-08-961 and 53-91-08-962. Standard Practices Manual (MTC ), Work Card: 20.02.09.601.



### 1.L. OTHER DOCUMENTS CONCERNED

EUROCOPTER will modify the Aircraft Maint enance Manual (AMM) and the Illustrated Parts Catalogue (IPC) with respect to this ALERT SERVICE BULLETIN.

These documents will be issued later.



### 1.M. TOOLING CONCERNED

Not applicable.



### 1.N. INTERCHANGEABILITY AND MIXABILITY OF PARTS

Not applicable.Approved under EASA DOA No. 21J.056 Page 7/12

2010.12.09 

### 2. ACCOMPLISHMENT INSTRUCTIONS

2.A. GENERAL

NOTE

Please feel free to contact EUROCOPTER should you need any further information or support when complying with the

instructions described in th is ALERT SERVICE BULLETIN.

Contact the EUROCOPTER Customer Service Technical Support Department by : Tel: +33 (0)4.42.85.97.10 Fax: +33 (0)4.42.85.99.66

Email: Airframe.technical-support@eurocopter.com



### 2.B. OPERATIONAL PROCEDURE

2.B.1. Preliminary steps:

Install the equipment giving access to the upper fin.

2.B.2. Check of the upper fin forward and aft upper and lower attachment fittings:

As per Figure 1 :

- Remove the forward (a) and aft (b) strips on the upper fin (h). - Make sure that there is no crack in the forward (c) and aft (d) upper fittings and in the forward (e) and

aft (f) lower fittings. Inspect the hatched areas shown in red on Figure 2 - DETAILS B, C and D (a tenfold magnifying glass or a high- resolution (more than 2 million pixels) digital camera can be used to facilitate the crack inspection).

. If in doubt, perform a dye penetrant crack detecti on inspection in accordance with MTC Work

Card 20.02.09.601.

a) If no crack is found in the forward (c) and aft (d ) upper fittings and in the forward (e) and aft (f) lower fittings:

- Leave as is. - Install the forward (a) and aft (b) strips on the upper fin (h).

. Before assembly, replace any damaged bolt(s) (g) and nut(s) (i). - Return the helicopter to flight c onfiguration as per paragraph 2.B.3.Approved under EASA DOA No. 21J.056 Page 8/12

2010.12.09 b) If a crack is found in a forward (c) and / or aft (d) upper fitting and / or in a forward (e) and / or aft (f) lower fitting:

- Remove the upper fin in accordance with AMM Task 53-91-00-061. - Remove and discard any cracked fitting(s) in accordance with AMM Task 53-91-08-961 and/or

Task 53-91-08-962. - Inform the Customer Service Technical Support Department by:

Fax: +33(0)4.42.85.99.66 Tel: +33(0)4.42.85.97.10.

E-mail: Airframe.technical-support@eurocopter.com - Install the upper fitting(s) (1) and/or (2) and/or the lower fitting(s) (3) and/or (4) as per AMM Task 53-91-08-961 and/or AMM Task 53-91-08- 962, or comply with Service Bulletin No. 53-029

which deals with the embodiment of modification 0754B40. - Install the upper fin in accordance with AMM Task 53-91-00-061. - Install the forward (a) and aft (b) strips on the upper fin (h). . Before assembly, replace any damaged bolt(s) (g) and nut(s) (i). - Return the helicopter to flight c onfiguration as per paragraph 2.B.3.

2.B.3. Final steps

- Remove the equipment giving access to the upper fin. - Resume flight.



### 2.C. IDENTIFICATION

Record compliance with this ALERT SERVIC E BULLETIN in the helicopter documents.



### 2.D. OPERATING AND MAINTENANCE INSTRUCTIONS

Not applicable.Approved under EASA DOA No. 21J.056 Page 9/12

2010.12.09 Figure 1Approved under EASA DOA No. 21J.056 Page 10/12

2010.12.09 Figure 2 Areas to be inspected with magnifying glasses 

# B C

DApproved under EASA DOA No. 21J.056 Page 11/12

2010.12.09 

### 3. MATERIAL INFORMATION

3.A. MATERIAL: COST - AVAILABILITY

3.A.1. Cost

For any information concerning kits and/or compon ents, contact the Sales and Customer Relations Department of the EUROCOPTER Network.



### 3.B. INFORMATION CONCERNING INDUSTRIAL SUPPORT

Not applicable.



### 3.C. MATERIAL REQUIRED FOR EACH HELICOPTER / ENGINE / COMPONENT

3.C.1. Kit(s) or component(s) to be or dered for one helicopter or one assembly

Material Part Number Qty Item Key Word Remark

365A234242-01 1 1 Upper fitting, FWD 365A234243-01 1 2 Upper fitting, AFT 365A234240-01 1 3 Lower fitting, FWD

365A234241-01 1 4 Lower fitting, AFT

3.C.2. Item(s) to be ordered separately

The products identified by an asterisk "*" or requi red for compliance with the Tasks and / or Work Cards listed in paragraph 1.K., can be or dered from the INTERTURBINE company.

Website: http://www.itlogistics.de Telephone: +49.41.91.809.300

AOG: +49.41.91.809.444Approved under EASA DOA No. 21J.056 Page 12/12

2010.12.09 

### 3.D. PROCUREMENT CONDITIONS

Order the required quantity (unless otherwise specified)

from

EUROCOPTER Etablissement de Marignane

Direction Ventes et Relations Client

ECR

13725 MARIGNANE CEDEX

FRANCE



### NOTE 1

For ALERT SERVICE BULLETINS, order by:

Telex: HELICOP 410 969F Fax: +33 (0)4 42 85 99 96



### NOTE 2

On the purchase order, please specify the mode of transport, the destination and the serial numbers of the helicopters to be

modified.



### 4. APPENDIX

Not applicable.