# ASB No. EC120-25A026

Revision 0 2011-07-11 Approved under EASA DOA No. 21J.056. Page 1/17

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

### Civil version: B



# ALERT SERVICE BULLETIN

SUBJECT : EQUIPMENT AND FURNISHINGS - Emergency floatation gear

Protector installation on the rear bracket and the supply couplings

Revision No. Date of issue

Revision 0 2011-07-11



### Summary :

During a maintenance operation on the RH emergency fl oatation gear, a deterioration of the floats has been found. Compliance with the AERAZUR equipment manufacturer Service Bulletin No. 25-69-87 consists in installing protectors on the LH and RH floats of the emergency float ation gear in order to prevent a possible deterioration.



### Compliance :

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

# ASB No. EC120-25A026

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### 1. PLANNING INFORMATION

1.A. EFFECTIVITY

1.A.1. Helicopters/installed equipment

Helicopters with a serial number below or equal to 1632 and fitted with emergency floatation gear P/N: - RH side (MP/N) 215675-0 or 215675-1 or 215675-2 - LH side (MP/N) 215674-0 or 215674-1 or 215674-2



### NOTE Refer to the aircraft individual inspection log book to identify the actual configuratio n of the helicopter.

1.A.2. Non-installed equipment

Emergency flotation gear P/N: - RH side (MP/N) 215675-0 or 215675-1 or 215675-2 - LH side (MP/N) 215674-0 or 215674-1 or 215674-2



### 1.B. ASSOCIATED REQUIREMENTS

The emergency floatation gears P/N:

- RH side: (MP/N) 215675-0 or 215675-1 - LH side: (MP/N) 215674-0 or 215674-1

must previously be upgraded to (MP/N) 215675-2 and 215674-2 in accordance with paragraphs 2.A. or 2.B. of the appended AERAZUR equipment manufacturer Service Bulletin 25-69-87.



### 1.C. REASON

During complete overhaul of an emergency floatatio n gear, the maintenance technicians from the repair

station were not able to inflate the RH float in acco rdance with the instructions given in the Component

Maintenance Manual. The investigations conducted by the repair station hav e revealed the perforation of one of the compartments

of the RH float and several deteriorated areas on the LH an d RH floats due to interference with the blunt parts of the bars and the banjo unions.

The perforation of at least one compartment of the LH or RH float may cause the helicopter to tumble during ditching and prevent the complete evacuation of the passengers and the flight crew. Consequently,

EUROCOPTER has issued the ALERT SERVICE BULLETI N 05A011 which enabled to check the condition of the emergency floatation gear floats ev ery 300 flying hours. This periodic check has been incorporated in the Maintenance Servicing Manual (MSM).

In order to eliminate interference between the blunt parts of the emergency float ation gear installation and the fabric of the floats, EUROCOPTER renders complianc e with the AERAZUR equipment manufacturer Service Bulletin 25-69-87 mandatory, in accordance with this ALERT SERVICE BULLETIN.

Compliance with this ALERT SERVICE BULLETI N 25A026 supersedes the scheduled hour based check according to ALERT SERVICE BULLETIN 05A011.

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

# ASB No. EC120-25A026

Revision 0 2011-07-11 Approved under EASA DOA No. 21J.056. Page 3/17

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### 1.D. DESCRIPTION

Compliance with this ALERT SERVICE BULLETIN c onsists in modifying the LH and RH emergency floatation gear assemblies as per paragraph 2 of t he AERAZUR equipment manufacturer Service Bulletin

No. 25-69-87. Compliance with this ALERT SERVICE BULLETIN also upgrades all emergency floatation gear assemblies to the latest configuration.



### 1.E. COMPLIANCE

1.E.1. Compliance at the works

Helicopters/installed equipment



### NOTE 1
Modification approval form FAM No . A00733 is integrated in the new definition of the installation from helicopter serial number 1632.



### NOTE 2 This serial number is given for information only, refer to the aircraft individual inspection record (RIC) to identify the actual configuration of the helicopter.

Non-installed equipment

Before delivery, comply with paragraph 3.B.2. of this ALERT SERVICE BULLETIN on the part numbers specified in paragraph 1.A.2.

1.E.2. Compliance in service

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

The operations on non-installed equipment are to be performed by the operator or by the supplier according to the configuration of the emergency floatation gear assemblies.

Helicopters/installed equipment

Comply with paragraph 3. (except for paragraph 3. B.2.) of this ALERT SERVICE BULLETIN within 300 flying hours or at the latest within 18 months (the firs t limit reached is applicable) following receipt of this ALERT SERVICE BULLETIN, issued on the date indicated at the foot of the page.

Non-installed equipment

Comply with paragraph 3.B.2. before installation on the helicopter and according to the requirements, without exceeding 18 months following receipt of this ALERT SERVICE BULLETIN, issued on the date indicated at the foot of the page.



### 1.F. APPROVAL

Approval of modifications

The information or instructions relate to FAM No. A00733 which was approved on February 28, 2011.

# ASB No. EC120-25A026

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

The technical information contained in this AL ERT SERVICE BULLETIN Revision 0 was approved on July 08, 2011 under the authority of EASA Design Organization Approv al No. 21J.056 fo r helicopters of civil versions subject to an Airworthiness Certificate.



### 1.G. MANPOWER

EUROCOPTER recommends that compliance with this ALERT SERVICE BULLETIN be ensured by personnel with the following qualification:

Qualification: 1 Mechanica l Engineering Technician.

The time for the operations is given for information purposes, for a standard configuration.

Time for the operations: Approximately 1 hour for a Mechanical Engineering Technician for the removalinstallation of the emergency floatation gear assembly. For compliance with the AERAZUR equip ment manufacturer Service Bulletin No. 25-69-87, refer to paragraph 1.F of the latter.



### 1.H. WEIGHT AND BALANCE

After completion of the work, record the weight and moment values on the PMC.

- Weight: + 0.36 kg

- Moment: Negligible moment deviations



### .

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.

- AMM: 25-67-00, 3-1: General instru ctions - Emergency floatation gear - AMM: 25-67-00, 4-1: Removal / Inst allation - Emergency floatation gear



### 1.L. DOCUMENTS AFFECTED

EUROCOPTER will incorporate FAM No. A00733 in the following document: - Illustrated Parts Catalog (IPC)

The affected document will be updated as part of a future revision.

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

Interchangeability

Equipment items pre modification and equipment it ems post modification are not interchangeable.

Mixability

Mixability of the emergency fl oatation gears pre modification:

- RH side (MP/N) 215675-0 or 215675-1 or 215675-2 - LH side (MP/N) 215674-0 or 215674-1 or 215674-2

and

emergency floatation gear assemblies post modifica tion (MP/N) 215674-3 and 215675-3 is forbidden on the landing gear assembly between the RH side and the LH side.

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### 2. MATERIAL INFORMATION

2.A. MATERIAL: PRICE - AVAILABILITY - PROCUREMENT

Refer to paragraph 1.G. of the appended AERAZUR equipment manufacturer Service Bulletin

No. 25-69-87.



### 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 :

Refer to paragraph 1.G. of the appended AERAZUR equipment manufacturer Service Bulletin

No. 25-69-87.

Former Key word Qty New

P/N Item P/N Instruction

LH emergency floatation gear A/R 215674-3 1 215674-0 or

215674-1 or

215674-2 /

RH emergency floatati on gear A/R 215675-3 2 215675-0 or

215675-1 or

215675-2 /

Products to be ordered separately :

Refer to the Tasks and Work Cards refer enced in this ALERT SERVICE BULLETIN:

The products can be ordered separately from t he INTERTURBINE AVIATION LOGISTICS company.

Website: http://www.interturbine.com Telephone: +49.41.91.809.300

AOG: +49.41.91.809.444



### 2.D. MATERIAL TO BE RETURNED

Not applicable.

# ASB No. EC120-25A026

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### 3. ACCOMPLISHMENT INSTRUCTIONS

3.A. GENERAL

Read and comply with the General instructio ns - Emergency floatation gear as per AMM
Task 25-67-00, 3-1.



### 3.B. OPERATIONAL PROCEDURE

3.B.1. Operational procedure on installed equipment (Figure 1)

Remove the LH emergency floatation gear assembly (a ) and the RH emergency floatation gear assembly (b) as per AMM Task 25-67-00, 4-1.

Refer to paragraph 2 of the appended AERAZUR equipment manufacturer Service Bulletin No. 25-69-87 in order to modify the emergency floatation gear assemblies.

Install the LH emergency floatation gear assembly (1 ) and the RH emergency floatation gear assembly (2) as per: AMM Task 25-67-00, 4-1.

3.B.2. Operational procedure on non-installed equipment

Refer to paragraph 2 of the appended AERAZUR equipment manufacturer Service Bulletin No. 25-69-87.



### 3.C. IDENTIFICATION

Identification of this document :

Record compliance with this document in the helicopter documents.

Identification of modifications on the equipment

Refer to the paragraph Identification (page 8/8) of the appended AERAZUR equipment manufacturer

Service Bulletin No. 25-69-87.



### 3.D. OPERATING AND MAINTENANCE INSTRUCTIONS

Not applicable.

# ASB No. EC120-25A026

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## b

2

a
1

Figure 1: Emergency floatation gears 

## A

A

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### 4. APPENDIX

AERAZUR equipment manufacturer Service Bulle tin No. 25-69-87 attached as an appendix (08 pages).

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