No. 2315-S-55 

Revision 0 2011-04-13 Page 1/2 

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SAFETY INFORMATION NOTICE 

SUBJECT: STABILIZERS 

Fins: Failure of the spar of the upper vertical fin 

AIRCRAFT Version(s) 

CONCERNED Civil Military 

AS350 B, BA, BB, B1, B2, B3, D L1 

AS550 A2, C2, C3, U2 

AS355 E, F, F1, F2, N, NP 

AS555 AF, AN, SN, UF, UN 

EUROCOPTER has received a report of the failure of the spar of the upper fin on an AS350 B2 helicopter modified 

in accordance with ASB 55.00.16 MOD 073330 "Improvement of attachment strength for upper and lower fin skids" 

since approximately 4,700 hours. 

At the take-off, the dispatcher on the ground noted that the fin was moving and contacted the pilot by radio, asking 

him to return to the base. 

Following this event, EUROCOPTER insists to remind you of the maintenance in force on the fins. 

The entire ECUREUIL fleet is now fitted with MOD 073330 which is mandatory since March 31, 2009 through 

compliance with: 

- ASB 55.00.16 for all AS350 helicopters 

- ASB 55.00.12 for all AS355 helicopters 

- ASB 55.00.07 for all AS550 helicopters 

- ASB 55.00.04 for all AS555 helicopters 

Main enhancements introduced by this ASB: 

- The holes of the skids are enlarged from 7 mm to 7.5 mm. 

- Installation of high head screws and special washers. 

- Check of the setting as per Work Card 55.00.00.402. For B2, B3, C3 AMM 55-20-00, 4-2. 

EUROCOPTER reminds you that this setting is essential for the strength of the fin installation and that the 

maintenance in force post MOD 073330 is the following. 

ALF check: 

Work Card 05.21.00.603: Visual check of the condition of the attachments of the stabilizer, fins and tail skid. 

For B2, B3, C3 AMM 05-40-00, 6-6. 

For the attention of 
 No. 2315-S-55 

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S inspection, 100h: 

Work Card 55.00.00.601 § 3.3.: Check of the skin of the lower and upper fins; TGB fairing removed. 

For B2, B3, C3 AMM 55-20-00, 6-1. 

T inspection, 600h: 

Work Card 55.00.00.601 § 3.4. and § 3.5.: Check of the fins, check of the tightening torque, check of the spar; TGB 

fairing and tail boom rear tail cone removed. 

For B2, B3, C3 AMM 55-20-00, 6-2. 

The purpose of these checks is to detect any anomaly such as loss of tightness, corrosion, cracks, etc. and to 

enable to stop, in full security, any deterioration scenario. 

Any abnormal behavior must be reported to the manufacturer as requested in Information Notice No. 2046-I-00. 

For any questions concerning this subject, please contact the Technical Support Department of the EUROCOPTER 

Customer Service: 

Tel: + 33 (0) 442.85.97.03 

Fax: + 33 (0) 442.85.99.66 

E-mail: airframe.technical-support@eurocopter.com

 No. 2315-S-55 

Revision 0 2011-04-13 Page 2/2 

Revision 1 2011-04-21 This document is available on the internet: www.eurocopter.com/techpub

S inspection, 100h: 

Work Card 55.00.00.601 § 3.3.: Check of the skin of the lower and upper fins; TGB fairing removed. 

For B2, B3, C3 AMM 55-20-00, 6-1. 

T inspection, 600h: 

Work Card 55.00.00.601 § 3.4. and § 3.5.: Check of the fins, check of the tightening torque, check of the spar; TGB 

fairing and tail boom rear tail cone removed. 

For B2, B3, C3 AMM 55-20-00, 6-2. 

The purpose of these checks is to detect any anomaly such as loss of tightness, corrosion, cracks, etc. and to 

enable to stop, in full security, any deterioration scenario. 

Any abnormal behavior must be reported to the manufacturer as requested in Information Notice No. 2046-I-00. 

For any questions concerning this subject, please contact the Technical Support Department of the EUROCOPTER 

Customer Service: 

Tel: + 33 (0) 442.85.97.03 

Fax: + 33 (0) 442.85.99.66 

E-mail: airframe.technical-support@eurocopter.com