# eurocopter an EADS 

### Company 

### ALERT SERVICE BULLETIN EC130 EUROCOPTER DI RECTION TEC HN IQUE SUPPORT 13725 MAR IGNANE C EDEX F RANCE 

### CIVIL VERSION(S) : 

### 84 

# ALERT SERVICE BULLETIN No. 65A002
SUBJECT: TAIL ROTOR DRIVE Check of the perpendicularity of bearing No. 1 , and check for absence of cracks and loosen ing of the rivets in the tube-to-flange attachment of the tail rotor drive center section shaft

REVISION No.

Revision 0

Approved under EASA DOA No. 21J .056 . DATE OF APPROVAL Date : November 15, 2005



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### ALERT SERVICE BULLETIN EC130 

### 1. PLANNING INFORMATION 1.A. EFFECTIVITY 1.A.1 . Helicopters/Installed equipment: On helicopters delivered before January 1 , 2005 (refer to the aircraft log book). 1 .A.2 . Non-installed equipment: Not applicable . 

### 1.8. ASSOCIATED REQUIREMENTS Not applicable. 

### 1.C. REASON To prevent loosening of the rivets in the center section shaft tube-to-flange attachment, by checkin g the perpendicularity of bearing No . 1 relative to the tail rotor drive center section shaft. 

### 1.D. DESCRIPTION EUROCOPTER has been informed of several cases of loosened rivets in the tube-to-flange attachment of the tail rotor drive center section shaft (on the center section 

### I rear section coupling side) . In one case , this loosening of rivets was associated with a crack in the tube which started from a loosened-rivet hole. These problems were detected during the periodic monitoring ofthe flanges , as defined in the Maintenance Program (MSM). Examinations of some ofthese center section shafts have revealed that bearing No . 1 was not perpendicular relative to the tail rotor drive center section shaft. This can cause abnormal loads in the flange and explain the loosening of rivets and the crack that was found . To prevent these occurrences , which could lead to failure ofthe tail rotor drive center section shaft, EUROCOPTER re nders compl ian ce with the measures defined in th is ALERT SERVICE BULLETIN , mandatory.



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### ALERT SERVICE BULLETIN EC130 1.E. COMPLIANCE 1 .E.1 . Compliance at the works 1.E.1.a. On helicopters/installed equipment: Compliance with paragraph 2.B. is ensured before delivery, since January 1 , 2005 . 1.E . 1.b . Non-installed equipment: Not applicable. 1 .E .2. Compliance in operation: By the operator. 1.E.2.a. On helicopters/i nstalled equipment: Comply once with paragraph 2.B. , no later than within the 50 flying hours or 3 months following receipt of this ALERT SERVICE BULLETIN , issued on the date indicated in the footer {the first limit reached is applicable) . 1.E.2 .b . Non-installed equipment: Not applicable. 

### 1.F. APPROVAL Approval is limited to civil version helicopters subject to an Airworthiness Certificate . The technical information contained in this ALERT SERVICE BULLETIN was approved on November 15, 2005 under the authority of EASA Design Organisation Approval No. 21 J .056 . 

### 1.G. MANPOWER Qualification : Mechanic. Time : approximately 1 hour. 

### 1.H. WEIGHT AND BALANCE Weight: Not applicable . Moment: Not applicable. 

### 1.1. EFFECT ON ELECTRICAL LOADS No effect.



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### 1.J. SOFTWARE MODIFICATION EMBODIMENT STATE Not applicable . 

### 1.K. REFERENCES Aircraft Maintenance Manual (AMM) Task 65-11-00, 4-8. 

### 1.L. OTHER DOCUMENTS CONCERNED Aircraft Maintenance Manual (AMM) . Maintenance Program (MSM). 

### 1.M. INTERCHANGEABILITY OR MIXABILITY OF PARTS Not applicable.



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### ALERT SERVICE BULLETIN 

### EC130 

### 2. ACCOMPLISHMENT INSTRUCTIONS 2.A. GENERAL Not applicable. 

### 2.8. OPERATIONAL PROCEDURE 2.B.1 . Preliminary steps

- Remove the tail rotor drive shaft fairings . 2.B.2. Procedure As per Figure 1 : -Visually check that there are no cracks and no loosened rivets at the center section shaft tube-to-flange

attachment. If there are cracks or loosened rivets, replace the center section shaft. -Check the perpendicularity of bearing No. 1:

. Procure a dial gage (1) equipped with a long feeler pin .

. Protect the tube ofthe center section shaft with adhesive paper in the area where the dial gage is to be

secured (DETAIL A) .

. Install and secure the dial gage on the tube of the center section shaft with the locally-manufactured

supports (5) and "TYRAP" (or other) type clamps.

. Bring the feeler ofthe dial gage into contact with the face ofthe ball ring (2) (DETAIL B).

. Turn the center section shaft one full turn by hand and check the perpendicularity of the bearing (3) . Interpretation ofthe results :

- Ifthe out-of-perpendicularity ofthe bearing (3) is equal to or less than 0. 1 mm ,

. leave as is ,

. remove the dial gage (1) and the protective adhesive paper from the tube ofthe center section shaft.

- Ifthe out-of-perpendicularity ofthe bearing (3) is more than 0.1 mm,

. loosen the screws (4) by one quarter of a turn until the ball ring (2) is released,

. make sure that the bearing (3) and the ball ring (2) are free to move ,

. turn the center section shaft by hand and make sure that the out-of-perpendicularity ofthe bearing as

read on the dial gage (1) is "equal to or less than 0.1 mm" ,

. tighten the 4 screws (4) in accordance with the procedu re and the tightening torque indicated in AMM

Task 65-11-00, 4-8,

. once again , using the dial gage (1 ), make sure that the out-of-perpendicularity ofthe bearing is effectively

"equal to or less than 0.1 mm" ,

. remove the dial gage (1) and the protective adhesive paper from the tube ofthe center section shaft. 2.B.3 . Final steps

- Install the tail rotor drive shaft fairings. 

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### ALERT SERVICE BULLETIN EC130 2.C. IDENTIFICATION

- Record initial compliance with this ALERT SERVICE BULLETIN in the aircraft documents . 

### 2.D. OPERATING AND MAINTENANCE INSTRUCTIONS Not applicable.



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2

Figure 1 

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# 65A002 ALERT SERVICE BULLETIN EC130



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### ALERT SERVICE BULLETIN EC130 

### 3. MATERIAL INFORMATION 3.A. MATERIAL: COST- AVAILABILITY Not applicable. 

### 3.B. INFORMATION CONCERNING INDUSTRIAL SUPPORT Not applicable . . 

### 3.C. MATERIAL REQUIRED FOR EACH AIRCRAFT, ENGINE 

### I COMPONENTS 3.C.1. Components(s) : The materials identified by an asterisk "*"or required for compliance with the tasks and/or work cards listed in paragraph 1 .K. , can be ordered from the INTERTURBINE company, Website : http://www.itlog istics.de

Phone : +49.4 1 .91.809 .300

AOG: +49.4 1 .91 .809.444 

### 3.D. MATERIAL REQUIRED FOR EACH SPARE PART Not applicable. 

### 3.E. RE-IDENTIFIED PARTS Not applicable. 

### 3.F. TOOLING: COST- AVAILABILITY Fo r any information , contact the Customer Service Sales Department.



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### ALERT SERVICE BULLETIN EC130 3.G. PROCUREMENT CONDITIONS Order the required quantity (unless otherwise specified) from EUROCOPTER Etablissement de Marignane Direction VENTES Service Client 

## s.v. 13725 MARIGNANE CEDEX FRANCE



### 4. APPENDIX Not applicable . 

### NOTE1 ForALERTSERVICE BULLETINS, order by: Telex: HELICOP 410 969F Fax: +33 (0)4 42 85 99 96

### NOTE2 On the purchase order , please specify the mode of transport , the destination and the serial numbers ofthe aircraft to be modified .



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