ALERT SERVICE BULLETIN EC120

Approved under DGAC DOA No. F.JA01 04A005 Page 1/8

2003.07.16

EUROCOPTER

DIRECTION TECHNIQUE SUPPORT

13725 MARIGNANE CEDEX FRANCE CIVIL VERSION(S): B

ALERT SERVICE BULLETIN

No. 04A005

SUBJECT: LIMITATIONS

Engine Mount

LIST OF APPROVED 

REVISIONS

REVISION No. 0

APPROVED

Not applicable Date: July 15, 2003
ALERT SERVICE BULLETIN EC120

Approved under DGAC DOA No. F.JA01 04A005 Page 2/8

2003.07.16

1. PLANNING INFORMATION

1.A. EFFECTIVITY

For engine mounts made up of:

- a engine mounting base more than 10.5 mm high (dimension H on Figure 1),

- support arms, P/N C714A1107201,

- swaged support arms, P/N C714A1106201,

- one LH support bracket, P/N C714A1101102,

- one RH support bracket, P/N C714A1101103.

IMPORTANT

1) This ALERT SERVICE BULLETIN does not apply to

aircraft having a serial number equal to or above 1170.

2) This ALERT SERVICE BULLETIN does not apply to

aircraft that have been modified in compliance with

Service Bulletin No. 71-003.

1.B. ASSOCIATED REQUIREMENTS

Not applicable.

1.C. REASON

To declare any engine mount, made up of the parts listed in paragraph 1.A., non-airworthy.

This ALERT SERVICE BULLETIN will form the subject of a DGAC Airworthiness Directive.

1.D. DESCRIPTION

Various tests conducted recently at the EUROCOPTER works have revealed that the engine mount definition

specified in paragraph 1.A., may in certain cases induce excessive loading on the coupling tube.

One case of cracks resulting from this excessive loading has been reported in service. These loads are

mainly due to:

- the initial "closed mounting base" type assembly, which, after installation, does not enable operators to

check that all the components are correctly assembled,

- a binding phenomenon resulting from wear on the components, and more particularly, on the washers on

the inner diameter of the mounting base.

EUROCOPTER has therefore decided to declare this installation non-airworthy according to the instructions

specified in paragraph 1.E.

EUROCOPTER reminds you that an improved installation of the engine mount exists as described in Service

Bulletin No. 71-003.

In addition, compliance with Service Bulletin No. 71-003 enables operators to extend the inspection interval

and the service life limit of the coupling tube (refer to Revision 2 of ALERT SERVICE BULLETIN

No. 05A003).
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1.E. COMPLIANCE

1.E.1. At the works

- On new aircraft: Not applicable. The components specified in paragraph 1.A are no longer installed on

aircraft with S/N 1170 onwards.

- On spares: Comply with paragraph 2.B.2. before delivery.

1.E.2. Retrofit action: By the operator.

- On aircraft: Flights with engine mounts made up of the components defined in paragraph 1.A. will be

prohibited from June 30, 2004 onwards. Consequently:

- Comply with paragraph 2.B. during the next scheduled inspection, but at the latest by

June 30, 2004.

- On spares: Contact EUROCOPTER for replacement of the components specified paragraph 1.A., held as

spares.

1.F. APPROVAL

Approval is limited to civil version helicopters subject to an Airworthiness Directive.

The technical information contained in this ALERT SERVICE BULLETIN was approved

on July 15, 2003 under the authority of DGAC Design Organisation Approval No. F.JA01.

1.G. MANPOWER

Qualification: 1 mechanic.

Time: Approximataly 15 minutes.

1.H. WEIGHT AND BALANCE

Weight: Not applicable.

Moment: Not applicable.

1.I. EFFECT ON ELECTRICAL LOADS

Not applicable.
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Approved under DGAC DOA No. F.JA01 04A005 Page 4/8

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1.J. SOFTWARE MODIFICATION EMBODIMENT STATE

Not applicable.

1.K. REFERENCES

EC 120 Service Bulletin No. 71-003.

Aircraft Maintenance Manual (AMM) Task 71-10-00, 4-1.

1.L. OTHER DOCUMENTS CONCERNED

Not applicable.

1.M. INTERCHANGEABILITY AND MIXABILITY OF PARTS

Not applicable.
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Approved under DGAC DOA No. F.JA01 04A005 Page 5/8

2003.07.16

2. ACCOMPLISHMENT INSTRUCTIONS

2.A. GENERAL

Not applicable.

2.B. OPERATIONAL PROCEDURE

2.B.1. Preliminary Steps:

- Open the upper cowlings as per AMM Task 71-10-00, 4-1.

2.B.2. Checking the engine mounting base

As per Figure 1:

- Measure the height (H) of the engine mounting base (1).

. if the height (H) of the mounting base (1) is equal to or less than 10.5 mm:

- leave as is and resume flights,

. if the height (H) of the mounting base (1) is more than 10.5 mm:

- install an engine mount that is not covered by the restriction specified in paragraph 1.E.2.

NOTE

1) Compliance with Service Bulletin No. 71-003 waives

compliance with the instructions given in paragraph 1.E.2.

2) Compliance with Service Bulletin No. 71-003 extends the

monitoring intervals and the service life limit of the

engine-to-MGB coupling tube, (refer to Revision 2 of

ALERT SERVICE BULLETIN No. 05A003).

2.B.3. Final steps

- Close the upper cowlings as per AMM Task 71-10-00, 4-1.

2.C. IDENTIFICATION

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

2.D. OPERATING AND MAINTENANCE INSTRUCTIONS

Not applicable.
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Figure 1
ALERT SERVICE BULLETIN EC120

Approved under DGAC DOA No. F.JA01 04A005 Page 7/8

2003.07.16

3. MATERIAL INFORMATION

3.A. MATERIAL - COST - AVAILABILITY

For all information, contact the Customer Support Sales Department.

3.B. INFORMATION CONCERNING INDUSTRIAL SUPPORT

Not applicable.

3.C. MATERIAL REQUIRED FOR EACH AIRCRAFT, ENGINE/COMPONENTS

Not applicable.

3.D. MATERIAL REQUIRED FOR EACH SPARE PART

Not applicable.

3.E. RE-IDENTIFIED PARTS

Not applicable.

3.F. TOOLING - COST - AVAILABILITY

Not applicable.
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3.G. PROCUREMENT CONDITIONS

Order the required quantity:

from

EUROCOPTER

Etablissement de Marignane

Direction VENTES Service Client

S.C.

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 number of

the aircraft to be modified.

4. APPENDIX

None.

ALERT SERVICE BULLETIN EC120

Approved under DGAC DOA No. F.JA01 04A005 Page 8/8

2003.07.16

3.G. PROCUREMENT CONDITIONS

Order the required quantity:

from

EUROCOPTER

Etablissement de Marignane

Direction VENTES Service Client

S.C.

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 number of

the aircraft to be modified.

4. APPENDIX

None.