ASB No. AS350-05.00.63 

Revision 0 2011-04-12 Approved under EASA DOA No. 21J.056. Page 1/17 

Revision 1 2011-04-18 This document is available on the internet: www.eurocopter.com/techpub 

Civil version(s): B, BA, BB, B1, B2, B3, D 

Military version(s): L1 

ALERT SERVICE BULLETIN 

SUBJECT: EQUIPMENT AND FURNISHINGS - Emergency floatation gear 

Check of the front and rear attachment brackets 

ATA: 25 

Revision No. Date of issue 

Revision 0 2011-04-12 

Revision 1 2011-04-18 

Summary: 

Check for no cracks on the front and rear attachment brackets of the AERAZUR type emergency floatation gear. 

Purpose of the latest revision: 

The purpose of revision 1 is to modify the effectivity for helicopters delivered after March 7, 2011, and to correct 

Figure 1. 

Compliance: 

EUROCOPTER renders compliance with this ALERT SERVICE BULLETIN mandatory. 

For the attention of
 

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1. PLANNING INFORMATION 

1.A. EFFECTIVITY 

1.A.1. Helicopters/installed equipment 

On helicopters equipped with fixed parts of the emergency floatation gear. 

1.A.2. Non-installed equipment 

- Rear LH attachment bracket MP/N 158172, 

- Rear RH attachment bracket MP/N 158173, 

- Front LH attachment bracket MP/N 158288, 

- Front RH attachment bracket MP/N 158289. 

1.B. ASSOCIATED REQUIREMENTS 

Not applicable. 

1.C. REASON 

EUROCOPTER has received several reports of cracks due to stress corrosion on the attachment brackets of 

the emergency floatation gear. 

In case of ditching, a cracked attachment bracket of the emergency floatation gear may rupture and no 

longer ensures the float stability of the helicopter. 

As a precaution and pending a modification to the definition, EUROCOPTER renders the check of the 

emergency floatation gear attachment brackets mandatory. 

 The purpose of revision 1 is: 

- to modify the effectivity for helicopters delivered after March 7, 2011, 

- to correct Figure 1, by replacing the symbol concerning the tightening-torque of the bolts of the brackets: 

the tightening-torque remains unchanged but it must be applied "dry", 

- to specify that the measurement of the bolts will allow EUROCOPTER to carry out additional analyses. 

Revision 1 does not affect compliance with Revision 0. 

Revision 1 of this ALERT SERVICE BULLETIN will form the subject of an EASA Airworthiness Directive. 

1.D. DESCRIPTION 

This ALERT SERVICE BULLETIN asks you to check the condition of the front and rear attachment brackets 

at regular intervals. 

1.E. COMPLIANCE 

1.E.1. Compliance at the works 

Not applicable. 
 

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1.E.2. Compliance in service 

Helicopters/installed equipment: 

For helicopters delivered before March 07, 2011 (excluded):

Comply with paragraph 3. of this ALERT SERVICE BULLETIN no later than within 110 flying hours without 

exceeding three months following receipt of Revision 0 of this ALERT SERVICE BULLETIN, issued on the 

date indicated at the foot of the page. 

Then, 

- Comply with paragraph 3. (except paragraph 3.B.2.a.) of this ALERT SERVICE BULLETIN at intervals not 

exceeding 13 months. 

NOTE 1 

When the periodic compliance with paragraph 3. of this ALERT SERVICE 

BULLETIN is ensured, it is necessary to return the appendix if a crack is 

found on a part. 

For helicopters delivered after March 07, 2011 (included): 

- Comply with paragraph 3. (except paragraph 3.B.2.a.) of this ALERT SERVICE BULLETIN within 

13 months following the delivery of the helicopter. 

 

Then, 

- Comply with paragraph 3 (except paragraph 3.B.2.a.) of this ALERT SERVICE BULLETIN at intervals not 

exceeding 13 months. 

NOTE 2 

When the periodic compliance with paragraph 3. of this ALERT SERVICE 

BULLETIN is ensured, it is necessary to return the appendix if a crack is 

found on a part. 

Non-installed equipment: 

Before installation of the attachment brackets specified in paragraph 1.A.2. which have logged flying hours, 

do the check as per paragraph 3.B.2. 

1.F. APPROVAL 

Approval of modifications: 

Not applicable. 

 Approval of this document: 

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

on April 12, 2011 under the authority of EASA Design Organization Approval No. 21J.056 for helicopters of 

civil versions subject to an Airworthiness Certificate. 

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

on April 12, 2011 under the prerogatives of the recognition of design capability FRA21J-002-DGA for French 

Government helicopters. 

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

on April 12, 2011 by the EUROCOPTER Airworthiness Department for export military versions. 
 

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The technical information contained in this ALERT SERVICE BULLETIN Revision 1 was approved 

on April 18, 2011 under the authority of EASA Design Organization Approval No. 21J.056 for helicopters of 

civil versions subject to an Airworthiness Certificate. 

The technical information contained in this ALERT SERVICE BULLETIN Revision 1 was approved 

on April 18, 2011 under the prerogatives of the recognition of design capability FRA21J-002-DGA for French 

Government helicopters. 

The technical information contained in this ALERT SERVICE BULLETIN Revision 1 was approved 

on April 18, 2011 by the EUROCOPTER Airworthiness Department for export military versions. 

1.G. MANPOWER 

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

personnel qualified as follows: 

Qualification: 1 mechanic. 

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

Time for the operations: Approximately 4 hours. 

1.H. WEIGHT AND BALANCE 

Not applicable. 

1.I. EFFECT ON ELECTRICAL LOADS 

Not applicable. 

1.J. SOFTWARE MODIFICATION EMBODIMENT RECORD 

Not applicable. 
 

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1.K. REFERENCES 

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

Standard Practices Manual (MTC): 

- MTC: 20.02.01.103: General - Installation of pipes 

- MTC: 20.02.05.404: Joining - Assembling by bolts and nuts 

- MTC: 20.02.09.101: Crack detection - General principles applicable to the dye-penetrant inspection 

procedure 

- MTC: 20.02.09.601: Crack detection - Checking structural parts and components using the dye-penetrant 

inspection procedure 

- MTC: 20.04.02.401: Stripping - Stripping organic surface coatings 

- MTC: 20.04.04.403: Surface treatment before painting - Surface treatment chemical conversion with 

"Alodine 1200" 

- MTC: 20.05.01.101: General sealing procedures: General sealing methods 

- MTC: 20.05.01.102: General sealing procedures - Sealing compound application methods 

- MTC: 20.05.01.211: Sealing compounds used in structural repairs or on transmission assemblies 

- Sealing compound MASTINOX 6856 K and 6856 H 

- MTC: 20.05.01.222: Sealing compounds used in structural repairs or on transmission assemblies 

- Sealing compound PR 1771 B2 

For AS350 helicopter versions B2, B3: 

Aircraft Maintenance Manual (AMM): 

- AMM: 24-00-00, 3-1: General instructions concerning electrical power 

- AMM: 25-67-00, 4-1: Removal / Installation - Emergency flotation gear 

For AS350 helicopter versions B, BA, BB, B1, D, L1: 

Maintenance Manual (MET): 

- MET: 24.00.00.301: Electrical power - General instructions 

- MET: 25.62.10.401: Emergency floatation gear - Cylinder - Floatation assembly: Removal - installation 

1.L. DOCUMENTS AFFECTED 

Not applicable. 

1.M. INTERCHANGEABILITY OR MIXABILITY OF PARTS 

Not applicable. 
 

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2. MATERIAL INFORMATION 

2.A. MATERIAL: PRICE - AVAILABILITY - PROCUREMENT 

Procurement conditions 

Order the required quantity (unless otherwise specified) 

from 

EUROPE MIDDLE EAST 

ZODIAC SERVICES EUROPE 

7, avenue du Parana 

BP 303 

91958 COURTABOEUF CEDEX / 

FRANCE 

Phone: +33 1 64 86 69 19 

Fax: +33 1 64 86 69 87 

ZODIAC AEROSPACE U.K. 

Unit 9, Blackwell drive 

Spring Wood Industrial estate

BRAINTREE - ESSEX CM7, 

ENGLAND 

Phone: 44 (0)-1376-329-194 

Fax: 44 (0)-1376-340-734 

IN-SERVICES MIDDLE EAST

Abu Dhabi International Airport

Cargo Village Area 

P.O. Box No 106675 

ABU DHABI - UNITED ARAB 

EMIRATES 

Phone: + 971 2575 7088 

Fax: + 971 2575 8482 

USA ASIA 

ZODIAC SERVICES AMERICAS

4900 St. Joe Boulevard, 

Building 200, Suite 400 

COLLEGE PARK, GA 30337 

USA 

Phone: +1 678 228 8153 

Fax: +1 800 879 0411 

ZODIAC SERVICES ASIA 

36, Loyang Drive 

SINGAPORE 508949 

Phone: +65 6579 2230 

Fax: +65 6579 2231 

http://www.services.zodiacaerospace.com 

NOTE 

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

destination and the serial numbers of the helicopters to be 

modified. 

2.B. INFORMATION CONCERNING INDUSTRIAL SUPPORT 

Not applicable. 
 

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2.C. MATERIAL REQUIRED FOR EACH HELICOPTER/COMPONENT 

Material to be ordered separately: 

 Old Designation Qty New Part Number Item Part Number → Instructions 

Rear LH 

attachment 

bracket 

A/R 158172 1 158172 

If a crack is found, 

return as per 

paragraph 2.D. 

Rear RH 

attachment 

bracket 

A/R 158173 2 158173 

If a crack is found, 

return as per 

paragraph 2.D. 

Front LH 

attachment 

bracket 

A/R 158288 3 158288 

If a crack is found, 

return as per 

paragraph 2.D. 

Front RH 

attachment 

bracket 

A/R 158289 4 158289 

If a crack is found, 

return as per 

paragraph 2.D. 

Nut A/R ASN52320BH120N 5 ASN52320BH120N 

Bolt A/R 350A84-0211-20 6 350A84-0211-20 Pre OP1672 

Bolt A/R 200748-0 7 200748-0 Post OP1672 

Screw A/R 22201BC120100L 8 22201BC120100L 

Products to be ordered separately: 

Refer to the Work Cards and Tasks specified in this ALERT SERVICE BULLETIN and the list below: 

Designation Qty Product P/N CM Item 

Sealing compound A/R PR1771B2 6068 9 

Sealing compound MASTINOX A/R ASNA4188EY90 518 10 

Protective product A/R ALODINE1200 316 11 

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 

Return the cracked attachment brackets to the address given below: 

EUROCOPTER 

Service E/SEE 

A l'attention de M. B. Loupias 

Bâtiment Marseilleveyre 

Etablissement de Marignane 

13725 MARIGNANE CEDEX 

FRANCE 
 

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3. ACCOMPLISHMENT INSTRUCTIONS 

3.A. GENERAL 

- Read and comply with the general instructions concerning the installation of pipes as per MTC Work 

Card 20.02.01.103. 

- Read and comply with the instructions concerning assembly by bolts and nuts as per MTC Work 

Card 20.02.05.404. 

- Read and comply with the general sealing procedures as per MTC Work Card 20.05.01.101. 

- Read and comply with the sealing compound application methods as per MTC Work Card 20.05.01.102. 

- Read and comply with the instructions concerning the use of sealing compound MASTINOX 6856 K and 

6856 H as per MTC Work Card 20.05.01.211. 

- Read and comply with the instructions concerning the use of sealing compound PR 1771 B2 as per MTC 

Work Card 20.05.01.222. 

- Read and comply with the general safety instructions concerning electrical power as per MET Work 

Card 24.00.00.301 or AMM Task 24-00-00, 3-1. 

3.B. OPERATIONAL PROCEDURE 

The procedure is described for the LH side only. The procedure is identical for the RH side. 

3.B.1. Preliminary steps 

- Remove the removable part of the emergency floatation gear as per MET Work Card 25.62.10.401 or 

AMM Task 25-67-00, 4-1, if installed. 

- Remove the bead of sealing compound between the front attachment bracket (e) and the skid (g) as per 

Figure 2. 

- Remove the attachment brackets (a) and (e) (Figure 1): 

. remove the rear attachment bracket (a): 

.. loosen and remove the screw (b), the nut (c) and the washer (d), 

.. remove the rear attachment bracket (a). 

. remove the front attachment bracket (e): 

.. loosen and remove the bolts (f), the nuts (c) and the washers (d), 

.. remove the front attachment bracket (e). 

- Clean the attachment brackets as per MTC Work Card 20.05.01.101. 
 

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3.B.2. Checks

3.B.2.a. During initial compliance with this ALERT SERVICE BULLETIN: 

- For each bolt (f) of the front attachment bracket (e) during initial compliance with this ALERT SERVICE 

BULLETIN: 

. Check whether there is a "BC" marking (or no “BC” marking) on the head of each bolt (f) (Detail K, 

Figure 3). 

. measure the length "L" (Detail J, Figure 3), with a 0.1 mm tolerance, of the plain section of each bolt 

shank 

. record the information in the table given in the Appendix by complying with the order of position of the 

bolts (f1) and (f2) (Detail C, Figure 2). 

NOTE 1 

The information gathered from the measurement of the bolts 

will allow EUROCOPTER to carry out additional analyses 

regarding the technical event. 

3.B.2.b. Each time compliance is ensured with this ALERT SERVICE BULLETIN (including initial compliance): 

- Using an appropriate tool, (for example a magnifying glass), visually inspect: 

. the front attachment bracket (e) on the inspection areas (F), (G) and (H) defined in Figure 1, 

NOTE 2 

As the front attachment bracket is fixed with two bolts, check 

for both bolts in the areas (G) and (H). 

. the rear attachment bracket (a) on the inspection areas (D) and (E) defined in Figure 1. 

- Make sure that there is no crack. 

- In case of doubt in one or several areas, perform a non destructive inspection on the suspected 

inspection area(s): 

. strip the area(s) as per MTC Work Card 20.04.02.401, 

. perform a local non-destructive inspection of the inspection area(s), for example a dye penetrant 

inspection as per MTC Work Cards 20.02.09.101 and 20.02.09.601. 
 

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Interpretation of the results: 

- If no crack is found on any attachment bracket: 

. do a surface treatment with the protective product (11) as per MTC Work Card 20.04.04.403. 

. comply with the final steps in accordance with paragraph 3.B.3. 

. on initial compliance with this ALERT SERVICE BULLETIN, fill in the form given in the Appendix to 

inform the EUROCOPTER Technical Support Department of the findings during inspection by: 

 Fax: +33(0)4.42.85.99.66 

 Phone: +33(0)4.42.85.96.48 

 E-mail: hydraulics.Technical-support@eurocopter.com

- If at least one crack is found on an attachment bracket: 

. return the attachment bracket as per paragraph 2.D. 

. on initial compliance with this ALERT SERVICE BULLETIN and on subsequent periodic compliance in 

case of crack findings on a part, fill in the form given in the Appendix to inform the EUROCOPTER 

Technical Support Department of the findings during inspection, by: 

 Fax: +33(0)4.42.85.99.66 

 Phone: +33(0)4.42.85.96.48 

 E-mail: hydraulics.Technical-support@eurocopter.com

. replace the attachment bracket concerned, 

. comply with the final steps in accordance with paragraph 3.B.3. 

3.B.3. Final steps 

- Install the rear attachment bracket (a) or (1) (Figure 1): 

. apply the sealing compound MASTINOX (10) between the screw (b) or (8) and the rear attachment 

bracket (a) or (1) as per MTC Work Card 20.05.01.211. 

. install the screw (b) or (8), the washer (d) and the nut (c) or (5), 

. torque tighten the nut (c) or (5) as per Figure 1. 

- Install the front attachment bracket (e) or (3): 

NOTE 3 

use the bolts (f) with “BC” marking or (6) for helicopters PRE 

modification OP1672, 

use the bolts (f) without “BC” marking or (7) for the 

helicopters POST modification OP1672. 

. apply the sealing compound MASTINOX (10) between the bolts (f) or (6) or (7) and the front attachment 

bracket (e) or (3) as per MTC Work Card 20.05.01.211, 

. install the bolts (f) or (6) or (7), the washers (d) and the nuts (c) or (5), 

. torque tighten the nuts (c) or (5) as per Figure 1. 

- Apply a bead of sealing compound (9) between the front attachment bracket (e) or (3) and the skid (g) 

as per Figure 2. The bead must be applied all around the front attachment bracket (e) or (3). 

- Install the emergency floatation gear as per MET Work Card 25.62.10.401 or AMM Task 25-67-00, 4-1. 
 

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3.C. IDENTIFICATION 

Identification of this document: 

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

3.D. OPERATING AND MAINTENANCE INSTRUCTIONS 

Not applicable. 
 

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Figure 1: Front and rear attachment brackets 

a 

1 

b 

8 

10 

d c 

5

c

5

d 

f 

6 or 7 

10 

e 

3 

Area E

Area H

Area G

Area F 

Area D
 

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Figure 2: Front attachment bracket 

e 

3 

g 

9 

f (SEE DETAIL J) 

f1 f2 

Examples of crack findings 

Cracks 

Crack Crack 
 

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Figure 3: Measurement and identification of the bolts

or 

f 

6 

f 

7 

L

f 

6 or 7 
 

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Figure 4: Examples of batch number marking of the attachment brackets
 

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4. APPENDIX 

The response form is attached as an appendix. 
 

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APPENDIX 

Form - response concerning ALERT SERVICE BULLETIN No. 05.00.63 

"Check of the front and rear attachment brackets" 

Fill in the form and send it to the indicated fax number or by e-mail 

EUROCOPTER établissement de Marignane 

Customer support 

Fax: +33(0)4.42.85.99.66 or E-mail: hydraulics.Technical-support@eurocopter.com

Operator Name and Address: 

_____________________________________ 

_____________________________________ 

_____________________________________ 

Aircraft Type and Version: _______________ 

Serial Number (S/N) of the helicopter: _________ 

Flying hours (FH): __________________ 

Check of the rear attachment brackets: 

Attachment 

bracket 

Batch No. 

(Figure 4) 

Condition (Cracks, Areas 

concerned, etc.)

LH 

RH 

Check of the front attachment brackets:

Bolt characteristics (Figure 3) Attachment 

bracket 

Batch No. 

(Figure 4) 

Condition (Cracks, Areas 

concerned, etc.) Bolt "BC" Marking 

(Detail K) 

Value "L" 

(Detail J) 

f1 

LH 

 f2 

f1 

RH 

 f2 

Remarks: 

____________________________________________________________________________________

____________________________________________________________________________________

___________________________________________________________________________ 

Date: _____________ Signature: ____________ 

Please make a copy of this page! The original form must remain in the ALERT SERVICE BULLETIN! 

 

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APPENDIX 

Form - response concerning ALERT SERVICE BULLETIN No. 05.00.63 

"Check of the front and rear attachment brackets" 

Fill in the form and send it to the indicated fax number or by e-mail 

EUROCOPTER établissement de Marignane 

Customer support 

Fax: +33(0)4.42.85.99.66 or E-mail: hydraulics.Technical-support@eurocopter.com

Operator Name and Address: 

_____________________________________ 

_____________________________________ 

_____________________________________ 

Aircraft Type and Version: _______________ 

Serial Number (S/N) of the helicopter: _________ 

Flying hours (FH): __________________ 

Check of the rear attachment brackets: 

Attachment 

bracket 

Batch No. 

(Figure 4) 

Condition (Cracks, Areas 

concerned, etc.)

LH 

RH 

Check of the front attachment brackets:

Bolt characteristics (Figure 3) Attachment 

bracket 

Batch No. 

(Figure 4) 

Condition (Cracks, Areas 

concerned, etc.) Bolt "BC" Marking 

(Detail K) 

Value "L" 

(Detail J) 

f1 

LH 

 f2 

f1 

RH 

 f2 

Remarks: 

____________________________________________________________________________________

____________________________________________________________________________________

___________________________________________________________________________ 

Date: _____________ Signature: ____________ 

Please make a copy of this page! The original form must remain in the ALERT SERVICE BULLETIN!