### ALERT SERVICE BULLETIN EC120

Approved under EASA DOA No. 21J.056. 

# 05A011 Page 1/10

2009.06.08

This document is available on t he internet: www.eur ocopter.com/techpub EUROCOPTER

DIRECTION TECHNIQUE SUPPORT

13725 MARIGNANE C EDEX F RANCE 

### CIVIL VERSION(S): B



# ALERT SERVICE BULLETIN

No. 05A011

SUBJECT : TIME LIMITS - MAINTENANCE CHECKS

Emergency floatation gears: periodic check of the floats with intervals in

hours

ATA : 25

REVISION No. DATE OF APPROVAL DATE OF ISSUE

Revision 0 On: June 04, 2009 2009.06.08

### ALERT SERVICE BULLETIN EC120

Approved under EASA DOA No. 21J.056. 

# 05A011 Page 2/10

2009.06.08 

### 1. PLANNING INFORMATION

1.A. EFFECTIVITY

1.A.1. Helicopters/installed equipment

Helicopters equipped with emergency floatat ion gear installation comprising:

- LH floatation gear, part number 215674-0 or 215674-1 or 215674-2, fitted with float part number 215481-0,

- RH floatation gear, part number 215675-0 or 215675-1 or 215675-2, fitted with float part number 215482-0.

1.A.2. Non-installed equipment

Emergency floatation gear installations comprising:

- LH floatation gear, part number 215674-0 or 215674-1 or 215674-2, fitted with float part number 215481-0,

- RH floatation gear, part number 215675-0 or 215675-1 or 215675-2, fitted with float part number 215482-0.



### 1.B. ASSOCIATED REQUIREMENTS

Not applicable.



### 1.C. REASON

The purpose of this ALERT SERVICE BU LLETIN is to define a periodic che ck with intervals in hours for the

floats listed in paragraph 1.A.

This ALERT SERVICE BULLETIN will form the subject of an EASA Airworthiness Directive.



### 1.D. DESCRIPTION

During overhaul of an emergency floatation gear insta llation, it was impossible for the repair center

maintenance technicians to inflate the RH float in accordance with the instructions of the equipment

manufacturer’s manual.

The investigations conducted by the repair center demonstrated that there was a puncture in one of the

compartments of the RH float and damage to several areas of the LH and RH floats due to contact with the

protruding sections of the supply bars and banjo unions.

Pending a modification that will prevent the float fabric covering from c hafing on the protruding sections of

the emergency gear floatation installation, EUROCOPTER makes the repeated check (intervals in hours) of

the emergency floatation gear floats mandatory.

### ALERT SERVICE BULLETIN EC120

Approved under EASA DOA No. 21J.056. 

# 05A011 Page 3/10

2009.06.08 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

Not applicable.

1.E.1.b. On non-installed equipment

Not applicable.

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

1.E.2.a. On helicopters/Installed equipment

- For emergency floatation gears that have logged more than 250 flying hours since first installation on a

helicopter or since their last overhaul.

. Comply with paragraph 2. no later than within 50 flying hours without exceeding 1 month following

receipt of this ALERT SERVICE BULLETIN, issued on the date indicated at the foot of the page.

Then,

. Comply with paragraph 2. at intervals not exceedi ng 300 flying hours following first compliance with this

ALERT SERVICE BULLETIN.

- For emergency floatation gears that have logged less than 250 flying hours since first installation on a

helicopter or since their last overhaul.

. Comply with paragraph 2. no later than within 300 fl ying hours following first installation on a helicopter

or their last overhaul.

Then,

. Comply with paragraph 2. at intervals not exceedi ng 300 flying hours following first compliance with this

ALERT SERVICE BULLETIN.



### NOTE

The overhaul of emergency floatation gears is scheduled

at 18 months according to the Maintenance Program (MSM).

1.E.2.b. On non-installed equipment

Comply with paragraph 1.E.2.a. bef ore installation on a helicopter.

### ALERT SERVICE BULLETIN EC120

Approved under EASA DOA No. 21J.056. 

# 05A011 Page 4/10

2009.06.08 1.F. APPROVAL

Approval is limited to civil version helicopter s subject to an Airworthiness Certificate.

1.F.1. Approval of modifications

Not applicable.

1.F.2. Approval of the Service Bulletin

The technical information given in th is ALERT SERVICE BULLETIN was approved

on June 04, 2009 under the authority of EASA De sign Organisation Approval No. 21J.056.



### 1.G. MANPOWER

1.G.1. Qualification

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

qualified personnel as follows:

- 1 Mechanical Engineering Technician.

1.G.2. Time for the operations

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

Time for the operations: approximately 6 hours for 1 emergency floatation gear installation.



### 1.H. WEIGHT AND BALANCE

Not applicable.



### 1.I. EFFECT ON ELECTRICAL LOADS

Not applicable.



### 1.J. SOFTWARE MODIFICATION EMBODIMENT RECORD

Not applicable.

### ALERT SERVICE BULLETIN EC120

Approved under EASA DOA No. 21J.056. 

# 05A011 Page 5/10

2009.06.08 1.K. REFERENCES

The documents required for compliance with this ALERT SERVICE BULLETIN are as follows:

Aircraft Maintenance Manual (AMM):

- AMM: Task 25-67-00,3-3: Folding - Floats.

- AMM: Task 25-67-00,4-1: Removal/In stallation - Emergency floatation gear.

- AMM: Task 25-67-00,6-3: Inspection - Fittings.

- AMM: Task 25-67-00,6-4: Inspection - Floats.



### 1.L. OTHER DOCUMENTS AFFECTED

Not applicable.



### 1.M. TOOLING AFFECTED

Not applicable.



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

Not applicable.

### ALERT SERVICE BULLETIN EC120

Approved under EASA DOA No. 21J.056. 

# 05A011 Page 6/10

2009.06.08 

### 2. ACCOMPLISHMENT INSTRUCTIONS

2.A. GENERAL

The operational procedure described below is applicabl e to both the LH and RH emergency floatation gear,

only the operations on the RH fl oatation gear are described.



### 2.B. OPERATIONAL PROCEDURE

2.B.1. Preliminary steps

- Remove the emergency floatation gear as per AMM Task 25-67-00,4-1.

- Install the assembly on a clean and well-lit surface protected with a plastic film.

2.B.2. Procedure (Figure 1)

- Undo the Velcro tapes and remove the break la ces. Remove the caps from the cover ends.

- Unfold the cover.

- Inspect the float areas (see examples Figure 1) in contact with the emergency floatation gear protruding

parts (supply bar, banjo union, fittings...) to make sure that these areas show no signs of deterioration:



### NOTE

In paragraph D.1.d. of AMM Ta sk 25-67-00,6-4, read "lightly

inflate the float to a pressure < 50 hPa" instead of "inflate the

float to a pressure > 50 hPa". The AMM will be updated later.

. if any deterioration is found:

- check the float for correct condi tion as per AMM Task 25-67-00,6-4.

- check the fittings for correct condition as per AMM Task 25-67-00,6-3.

- inform EUROCOPTER of the result of these checks at the following address:

Hydraulics.Technical-Support@eurocopter.com

. if no deterioration is found, leave as is.

- Fold the float as per AMM Task 25-67-00,3-3.

2.B.3. Final steps

- Install the emergency floatation gear as per AMM Task 25-67-00,4-1.



### 2.C. IDENTIFICATION

2.C.1. Identification of modi fications in the documentation

2.C.1.a. Helicopters/Installed equipment

Record first compliance with this ALERT SERVICE BULLETIN in the helicopter documents and on the log

card of the float checked.

### ALERT SERVICE BULLETIN EC120

Approved under EASA DOA No. 21J.056. 

# 05A011 Page 7/10

2009.06.08 2.C.1.b. Non-installed equipment

Record first compliance with this ALERT SERVICE BULLETIN on the log card of the float checked.

2.C.2. Identification of modifications on equipment

Not applicable.



### 2.D. OPERATING AND MAINTENANCE INSTRUCTIONS

Not applicable.

### ALERT SERVICE BULLETIN EC120

Approved under EASA DOA No. 21J.056. 

# 05A011 Page 8/10

2009.06.08 Figure 1: Examples of deteriorations of the float due to contact with the

protruding parts of the emergency floatation gear installation

### ALERT SERVICE BULLETIN EC120

Approved under EASA DOA No. 21J.056. 

# 05A011 Page 9/10

2009.06.08 

### 3. MATERIAL INFORMATION

3.A. MATERIAL: PRICE AND AVAILABILITY

3.A.1. Prix

Not applicable.

3.A.2. Availability

Not applicable.



### 3.B. INFORMATION CONCERNING INDUSTRIAL SUPPORT

Not applicable.



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

3.C.1. Kits or components to be ordered for one helicopter or one assembly

Not applicable.

3.C.2. Material to be ordered separately

The materials identified by an asterisk "*" or required fo r compliance with the Tasks and/or Work Cards listed in

paragraph 1.K., can be ordered from the INTERTURBINE company:

Website: http://www.itlogistics.de

Phone: +49.41.91.809.300

AOG: +49.41.91.809.444.

### ALERT SERVICE BULLETIN EC120

Approved under EASA DOA No. 21J.056. 

# 05A011 Page 10/10

2009.06.08 3.D. PROCUREMENT CONDITIONS

Order the required quantity (unless otherwise specified)

from

EUROCOPTER

Etablissement de Marignane

Direction Ventes et Relation 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 num bers of the helicopters to be

modified.



### 4. APPENDIX

Not applicable.