# ASB No. ALOUETTE-65.149

Revision 0 2011-03-23 Approved under EASA DOA No. 21J.056 Page 1/9

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

### Civil version(s): 3130, 313B, 3180, 318B, 318C,

3160, 316B, 316C, 319B



# ALERT SERVICE BULLETIN

SUBJECT : ROTORS – Free-Wheel assembly

Check of the free-wheel cage

Revision No. Date of issue

Revision 0 2011-03-23



### Summary :

Following a report of incorrect machining of a free-wheel cage, EUROCOPTER renders t he check of the free-wheel

cage mandatory.



### Compliance :

EUROCOPTER renders compliance with th is ALERT SERVICE BULLETIN mandatory. For the attention of

# ASB No. ALOUETTE-65.149

Revision 0 2011-03-23 Approved under EASA DOA No. 21J.056 Page 2/9

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

### 1. PLANNING INFORMATION

1.A. EFFECTIVITY

1.A.1. Helicopters/installed equipment

Helicopters equipped with a free-wheel assembly, all part numbers:

- which underwent the latest (complete) overhaul between October 15, 2003 and the date of issue of

Revision 0 of this ALERT SERVICE BULLETIN,

and

- whose Log Card does not make mention of the Letter to Repair Stations No. 245.



### NOTE 1

Refer to the Log Card of the free-wheel assembly to identify

the actual configuration of the free-wheel assembly.

1.A.2. Non-installed equipment

Free-wheel assemblies, all part numbers:

- which underwent the latest (complete) overhaul between October 15, 2003 and the date of issue of

Revision 0 of this ALERT SERVICE BULLETIN,

and

- whose Log Card does not make mention of the Letter to Repair Stations No. 245.



### NOTE 2

Refer to the Log Card of the free-wheel assembly to identify

the actual configuratio n of the free-wheel.

Free-wheel cages, referenced (P/N) 3130S60-10- 003, delivered between October 15, 2003 and

February 24, 2009 inclusive.



### 1.B. ASSOCIATED REQUIREMENTS

Not applicable.



### 1.C. REASON

During autorotation in-flight training, a pilot experienc ed a heavy jerk in the yaw control at the time of

resynchronization.

The free-wheel assembly of the helicopter had been replaced shortly before this flight.

Internal inspection of the free-wheel assembly rev ealed incorrect positioning of the roller drive pocket

recesses on the cage. The subsequent off-setting limits t he travel of the roller on its ramp and can cause,

under torque, free-wheel slippage, liable to jeopardize flight safety.

EUROCOPTER therefore renders the chec k of the free-wheel cage mandatory.

Revision 0 of this ALERT SERVICE BULLETIN will form the subject of an EASA Airworthiness Directive.



### 1.D. DESCRIPTION

Compliance with this ALERT SERVICE BULLETIN cons ists in removing and disassembling the free-wheel

assembly, in order to check the free-wheel cage.

# ASB No. ALOUETTE-65.149

Revision 0 2011-03-23 Approved under EASA DOA No. 21J.056 Page 3/9

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

### 1.E. COMPLIANCE

1.E.1. Compliance at the works

Not applicable.

1.E.2. Compliance in service

The operations are to be performed on the helicopter by the operator.

Helicopters/installed equipment

Comply with paragraph 3. of this ALERT SERVICE BU LLETIN within 110 flying hours following receipt of this

ALERT SERVICE BULLETIN, issued on the date indicat ed at the foot of the page, at the latest

by December 30, 2011.

Non-installed equipment

Comply with paragraph 3. of this ALERT SERVICE BULLETI N, issued on the date indicated at the foot of the

page, before installation on the helicopter and at the latest by December 30, 2011.



### 1.F. APPROVAL

Approval of modifications

Not applicable.

Approval of this document

The technical information contained in this AL ERT SERVICE BULLETIN Revision 0 was approved

on March 23, 2011 under the aut hority of EASA Design Organization A pproval No. 21J.056 for civil version

helicopters subject to an Ai rworthiness Certificate.

The technical information contained in this AL ERT SERVICE BULLETIN, Revision 0 was approved

on March 23, 2011 under the prerogatives of the re cognition of design capability FRA21J-002-DGA for

French Government helicopters.



### 1.G. MANPOWER

EUROCOPTER recommends that compliance with this ALERT SERVICE BULLETIN be ensured by

personnel qualified as follows:

Qualification: 1 Mechanical engineering technician.

The operation times are given for information purposes, for a standard configuration.

Time for the operations: approximately 1 day to check the free-wheel cage.

approximately 1 day to replace the free-wheel cage.

The helicopter grounding time is approximately 2 days if the free-wheel cage needs replacing.



### 1.H. WEIGHT AND BALANCE

Not applicable.

# ASB No. ALOUETTE-65.149

Revision 0 2011-03-23 Approved under EASA DOA No. 21J.056 Page 4/9

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

### 1.I. EFFECT ON ELECTRICAL LOADS

Not applicable.



### 1.J. SOFTWARE MODIFICATION EMBODIMENT RECORD

Not applicable.



### 1.K. REFERENCES

The following documents are necessary for comp liance with this ALERT SERVICE BULLETIN:

Helicopter versions 3130 and 313B:

MDE: 40.1.3-R.I-1: Free-wheel coupling shaft - Remova l - installation - Removal - installation of the

free-wheel coupling shaft with oil-cooled clutch

MDE: 40.1.3-R.I-2: Free-wheel coupling shaft - Remova l - installation - Removal - installation of the

free-wheel coupling shaft with dry clutch

MDE: 40.1.3-I.C-1: Free-wheel coupling shaft - Inspections - Checks - Thorough inspection of the free-wheel

with disassembly

MDE: 40.1.3-I.C-3: Free-wheel coupli ng shaft - Inspections - Checks - Periodic check of the free-wheel

Helicopter versions 3180, 318B and 318C:

MDE: 40.1.3-R.I-1: Free-wheel coupling shaft - Remova l - installation - Removal - installation of the

free-wheel coupling shaft

MDE: 40.1.3-I.C-1: Free-wheel coupling shaft - Inspections - Checks - Thorough check of the free-wheel with

disassembly

MDE: 40.1.3-I.C-3: Free-wheel coupli ng shaft - Inspections - Checks - Periodic check of the free-wheel

Helicopter versions 3160, 316B, 316C and 319B:

MDE: 40.00.301: Dynamic systems - "Mechanical" instructions

MDE: 40.13.401: Free-wheel coupling shaft - Removal - installation of the assembly

MDE: 40.13.603: Free-wheel coupling sh aft - Periodic check of the free-wheel

MRM: 40.13.450: Free-wheel coupling shaft - Repl acement of the free-wheel bearings and seals



### 1.L. DOCUMENTS AFFECTED

Not applicable.



### 1.M. INTERCHANGEABILITY OR MIXABILITY OF PARTS

Not applicable.

# ASB No. ALOUETTE-65.149

Revision 0 2011-03-23 Approved under EASA DOA No. 21J.056 Page 5/9

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

### 2. MATERIAL INFORMATION

2.A. MATERIAL: PRICE - AVAILABILITY - PROCUREMENT

For any information concerning the kits and/or comp onents, contact the EUROCOPTER Network Sales &

Customer Relations Department.

The kits and/or components will be delivered on the operator’s order.

Order the required quantity (unless otherwise specified)

from

EUROCOPTER

Etablissement de Marignane

Direction Ventes et Relations Client (ECR)

13725 MARIGNANE CEDEX

France

NOTE 1

On the purchase order, please specify the mode of transport, the

destination and the serial numbers of the helicopters to be modified.

NOTE 2

For ALERT SERVICE BULLETINS, order by:

Telex: HELICOP 410 969F

Fax: +33 (0)4 42 85 99 96



### 2.B. INFORMATION CONCERNING INDUSTRIAL SUPPORT

Not applicable.



### 2.C. MATERIAL REQUIRED FOR EACH HELICOPTER/COMPONENT

Kits or components to be ordered for one helicopter or one assembly:

Former Designation Qty New Part Number Item Part Number Instructions

Cage A/R 3130S60-10- 003 1 3130S60-10-003 /

O-ring 1 2X56,9-23B7 2 2X56,9-23B7 Discard

Products to be ordered separately :

In accordance with the Work Cards and Ta sks specified in this Service Bulletin.

The products can be ordered separately from the INTERTURBINE AVIATION LOGISTICS Company.

Website: http://www.interturbine.com

Phone: +49.41.91.809.300

AOG: +49.41.91.809.444



### 2.D. MATERIAL TO BE RETURNED

Not applicable.

# ASB No. ALOUETTE-65.149

Revision 0 2011-03-23 Approved under EASA DOA No. 21J.056 Page 6/9

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

### 3. ACCOMPLISHMENT INSTRUCTIONS

3.A. GENERAL

Read and comply with the general instructions co ncerning mechanical systems as per MDE Work

Card 40.00.301.



### 3.B. OPERATIONAL PROCEDURE

3.B.1. Preliminary steps

- Install the access equipment.

3.B.2. Check of the free-wheel cage (Figures 1 and 2)

- Remove the free-wheel assembly (a) (Figure 1) as per MDE Work Card 40.13.401 or MDE Work

Card 40.1.3-R.I-1 or 40.1.3-R.I-2.

THE ROLLERS (c) ARE HELD BY THE FREE-WHEEL

DRIVEN HEAD (b). CAREFULLY PULL OUT THE

FREE-WHEEL DRIVEN HEAD (b), IN ORDER TO

RECOVER THE ROLLERS (c).

- Pull out the free-wheel driven head (b) as per MRM Wo rk Card 40.13.450 or MDE Work Card 40.1.3-I.C-1.

- On the free-wheel cage (d) (Figure 2), check the a lignment of the tab (C) with the pocket recess (D):

. If the left edge of the tab (C) is in line with the left edge of the pocket recess (D) (Detail A, Figure 2):

- Re-assemble the free-wheel assembly (a) as per pa ragraph 3.a. of MDE Work Card 40.13.603 or as

per paragraph C.(1) of MDE Work Card 40.1.3-I.C-3.



### NOTE 1

When you re-assemble the free-wheel assembly, you must

replace the O-ring (e) with an O-ring (2).

- install the free-wheel assembly (a) as per MDE Work Card 40.13.401 or MDE Work

Card 40.1.3-R.I-1 or MDE Work Card 40.1.3-R.I-2.

. If the right edge of the tab (C) is in line with the right edge of the pocket rece ss (D) (Detail B, Figure 2):

- discard the free-wheel cage (d),

- replace the free-wheel cage (d) with a free-wheel cage (1) as per MRM Work Card 40.13.450 or

MDE Work Card 40.1.3-I.C-1,

- re-assemble the free-wheel assembly (a) as per MRM Work Card 40.13.450 or MDE Work

Card 40.1.3-I.C-1.



### NOTE 2

When you re-assemble the free-wheel assembly, you must

replace the O-ring (e) with an O-ring (2).

- install the free-wheel assembly (a) as per MDE Work Card 40.13.401 or MDE Work

Card 40.1.3-R.I-1 or MDE Work Card 40.1.3-R.I-2. 

### CAUTION

# ASB No. ALOUETTE-65.149

Revision 0 2011-03-23 Approved under EASA DOA No. 21J.056 Page 7/9

This document is available on the internet : www.eurocopter.com/techpub 3.B.3. Final steps

- Remove the access equipment.



### 3.C. IDENTIFICATION

Identification of this document :

Record compliance with this ALERT SERVICE BULLETIN in the helicopter documents and on the Log Card

of the free-wheel.



### 3.D. OPERATING AND MAINTENANCE INSTRUCTIONS

Not applicable.

# ASB No. ALOUETTE-65.149

Revision 0 2011-03-23 Approved under EASA DOA No. 21J.056 Page 8/9

This document is available on the internet : www.eurocopter.com/techpub Figure 1: Location of the free-wheel cage a

d

1 c b e

2 a

# ASB No. ALOUETTE-65.149

Revision 0 2011-03-23 Approved under EASA DOA No. 21J.056 Page 9/9

This document is available on the internet : www.eurocopter.com/techpub Figure 2: Check of the free-wheel cage 

## D d

1 

## DETAIL A DETAIL B C

d

1 

## Correct cage

t Incorrect cage