### ALERT SERVICE BULLETIN AS332

Approved under EASA DOA No. 21J.056. 

# 05.00.76 Page 1/16

2008.02.20 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): C,C1,L,L1 MILITARY VERSION(S): B,B1,M,M1,F1 

# ALERT SERVICE BULLETIN

No. 05.00.76

SUBJECT : TIME LIMITS - MAINTENANCE CHECKS

Check of the outer skin and the butt strap at Frame 5295



### ATA : 53

REVISION No. DATE OF APPROVAL DATE OF ISSUE

Revision 0 On: February 20, 2008 2008.02.20

### ALERT SERVICE BULLETIN AS332

Approved under EASA DOA No. 21J.056. 

# 05.00.76 Page 2/16

2008.02.20 

### 1. PLANNING INFORMATION

1.A. EFFECTIVITY

1.A.1. Helicopters/Installed equipment

Helicopters pre-MOD 0722907, except for serial numbers 2078 and 2102.



### NOTE

Helicopters modified per MOD 0722907 and helicopters S/N 2078 and 2102 are not concerned by the instructions in this ALERT SERVICE BULLETIN (refer to the aircraft Individual Inspection Log Book to identify the actual modification status of the aircraft). Frame 5295 on helicopters S/N 2078 and 2102 has been replaced through compliance with repair sheets 332.53.509.07 and 332.53.502.06 respectively.

1.A.2. Non-installed equipment

Not applicable.



### 1.B. ASSOCIATED REQUIREMENTS

Not applicable.



### 1.C. REASON

To periodically check that there are no cracks in the out er skin or the butt strap in the sliding cowling LH and

RH rail attachment areas on Frame 5295.

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

### ALERT SERVICE BULLETIN AS332

Approved under EASA DOA No. 21J.056. 

# 05.00.76 Page 3/16

2008.02.20 1.D. DESCRIPTION

EUROCOPTER has been informed of a crack detected in Frame 5295 in the attachment area of an MGB rear suspension bar on an AS332L helicopter

. This helicopter had logged a total of 28,338 flying hour s. Frame 5295 equipping this helicopter was of the "first generation" definition (Pre-M OD 0722907), i.e., comprising plates and angles assembled by riveting. The crack in Frame 5295 was detected due to the presence of a crack in the outer skin and in the butt strap near the sliding cowling rail, during an ALF check (check after the last f light of the day). After removing the coverings and certain structural components, such as gussets and angles, damage was noted from inside the helicopter: cracks in the flange and the outer angles and in part of the web, near the sliding cowling rail attachment (refer to Figure 4).

Considering the examinations and analyses of t hese cracks, EUROCOPTER is introducing additional monitoring requirements for Frame 5295, on the outside of the helicopter, on the skin and on the butt strap near the sliding cowling rail attachment.

This check is made easier by embodying MOD 0726478, wh ich consists in cutting out the sliding cowling rails locally. This cut-out exposes the splice near the rail attachm ent holes, making it easier to detect a crack and thus reducing the risks of cracks occurring in Frame 5295.

EUROCOPTER renders compliance with the measur es defined in this ALERT SERVICE BULLETIN, mandatory.

### ALERT SERVICE BULLETIN AS332

Approved under EASA DOA No. 21J.056. 

# 05.00.76 Page 4/16

2008.02.20 1.E. COMPLIANCE

1.E.1. Compliance at the works

1.E.1.a. On helicopters/inst alled equipment: Not applicable.

1.E.1.b. Non-installed equipment: Not applicable.

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

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

1) On helicopters which have logged less than 8,800 flying hours on receipt of this ALERT SERVICE
BULLETIN, issued on the date indica ted at the foot of the page:

- Comply with paragraph 2.B. at the latest within 10 flying hours after reaching 8,800 flying hours, then,

a) If there is no crack in the outer skin or in the butt strap in area 1: - comply with paragraph 2.B. at in tervals not exceeding 10 flying hours.

b) If there is a crack in the outer skin and/or in the butt strap in area 1, and if there is no crack in area

1 of Frame 5295:

- Contact the Customer Service Technical Support Operations Department (ESTVA) to ask for the

appropriate repair sheet according to how the crack is situated, by: Tel.: +33 (0)4.42.85.99.29 Fax: +33 (0)4.42.85.99.66.

. Pending compliance with the appropriate repair s heet, comply with paragraph 2.B.2. at intervals

not exceeding 50 flying hours.

and . After compliance with the appropriate repair shee t, comply with paragraph 2.B. at intervals not

exceeding 10 flying hours.

c) If there is a crack in the outer skin and/or in the butt strap in area 1, and if there is a crack in area 1

of Frame 5295:

- Stop flights.

- Inform the Customer Service Technical Support Operations D epartment (ESTVA) by:

Tel.: +33 (0)4.42.85.99.29 Fax: +33 (0)4.42.85.99.66.

- EUROCOPTER recommends compliance with paragraph 2.B.3. within 300 flying hours/6 months after

reaching 8,800 flying hours (the firs t limit reached is applicable).

### ALERT SERVICE BULLETIN AS332

Approved under EASA DOA No. 21J.056. 

# 05.00.76 Page 5/16

2008.02.20 2) On helicopters which have logged 8,800 flying hours or more on receipt of this ALERT SERVICE
BULLETIN, issued on the date indi cated at the foot of the page:

- Comply with paragraph 2.B. at the latest within 10 flying hours,

then,

a) If there is no crack in the outer skin or in the butt strap in area 1: - comply with paragraph 2.B. at in tervals not exceeding 10 flying hours.

b) If there is a crack in the outer skin and/or in the butt strap in area 1, and if there is no crack in area

1 of Frame 5295:

- Contact the Customer Service Technical Support Operations Department (ESTVA) to ask for the

appropriate repair sheet according to how the crack is situated, by: Tel.: +33 (0)4.42.85.99.29 Fax: +33 (0)4.42.85.99.66.

. Pending compliance with the appropriate repair s heet, comply with paragraph 2.B.2. at intervals

not exceeding 50 flying hours.

and . After compliance with the appropriate repair shee t, comply with paragraph 2.B. at intervals not

exceeding 10 flying hours.

c) If there is a crack in the outer skin and/or in the butt strap in area 1, and if there is a crack in area 1

of Frame 5295:

- Stop flights.

- Inform the Customer Service Technical Support Operations D epartment (ESTVA) by:

Tel.: +33 (0)4.42.85.99.29 Fax: +33 (0)4.42.85.99.66.

- EUROCOPTER recommends compliance with par agraph 2.B.3. within 300 flying hours/6 months

following receipt of this ALERT SERVICE BULLETIN, issued on the date indicat ed at the foot of the page (the first limit reached is applicable).

1.E.2.b. On spares: Not applicable.



### 1.F. APPROVAL

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

The technical information given in th is ALERT SERVICE BULLETIN was approved on February 20, 2008 under the authority of EASA Design Organisation Approval No. 21J.056.



### 1.G. MANPOWER

Qualification: Mechanic or structure technician.

Time: 15 minutes (approximately, fo r compliance with paragraph 2.B.1.). 1 hour (approximately, for comp liance with paragraph 2.B.2.). 3 hours (approximately, for comp liance with paragraph 2.B.3.).

### ALERT SERVICE BULLETIN AS332

Approved under EASA DOA No. 21J.056. 

# 05.00.76 Page 6/16

2008.02.20 1.H. WEIGHT AND BALANCE

Weight: Not applicable. Moment: Not applicable.



### 1.I. EFFECT ON ELECTRICAL LOADS

Not applicable.



### 1.J. SOFTWARE MODIFICATION EMBODIMENT STATE

Not applicable.



### 1.K. REFERENCES

Maintenance Manual (MET) Work Cards: 53.50.00.403,

53.50.00.601.

Standard Practices Manual (MTC ) Work Cards: 20.02.09.601,
20.04.04.403,
20.04.05.402,

20.04.05.403.



### 1.L. OTHER DOCUMENTS CONCERNED

Maintenance Program (PRE). Maintenance Manual (MET).



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

Not applicable.

### ALERT SERVICE BULLETIN AS332

Approved under EASA DOA No. 21J.056. 

# 05.00.76 Page 7/16

2008.02.20 

### 2. ACCOMPLISHMENT INSTRUCTIONS

2.A. GENERAL

The operational procedure in paragraph 2.B. describes the operations for one side and for the front and rear section of Frame 5295, and must be applied to both t he LH and RH sides of Frame 5295 (refer to Figure 1).



### 2.B. OPERATIONAL PROCEDURE

2.B.1. Visual check of the outer ski n and the butt strap in the sliding cowling LH and RH rail attachment areas on

Frame 5295

As per Figure 2 - Open the sliding cowling. - Visually check that there is no crack in t he outer skin or in the butt strap in area 1:



### NOTE

Area 1 includes the screws attaching the sliding cowling rail to

the front and rear section of Frame 5295 and to the skin.

Interpretation of the results:

a) If there is no crack in the outer skin and in the butt strap in area 1:

- Leave as is. - Close the sliding cowling. - Resume flights.

b) If there is a crack in the outer skin and/or in the butt strap in area 1: - Visually check that there are no cracks in Frame 5295 in accordance with paragraph 2.B.2.

2.B.2. Visual check to make sure there are no cracks in Frame 5295

2.B.2.a. Preliminary steps

As per Figures 3 and 4

- Gain access to area 1 of Frame 5295.

. Remove stringer gusset (c) and fitting (d). . If necessary,

- remove the TYRAP clamps to separate the elec trical harnesses when performing the visual or

borescope check, - remove the soundproofing mats. - Visually check that there are no cracks in area 1 of Frame 5295.

If in doubt, carry out a dye penetrant inspec tion as per MTC Work Card 20.02.09.601.

### ALERT SERVICE BULLETIN AS332

Approved under EASA DOA No. 21J.056. 

# 05.00.76 Page 8/16

2008.02.20 2.B.2.b. Interpretation of the results

1) If there is no crack in area 1 of Frame 5295: - Reinstall stringer gusset (c) and fitting (d). - Fit TYRAP clamps if they were removed. - If necessary, reinstall the LH and RH coverings and the ceiling coverings between two inspections. - Resume flights.

2) If there is a crack in area 1 of Frame 5295: - Stop flights.

- Inform the Customer Service Technical Support Operations Depar tment (ESTVA) by:

Tel.: +33 (0)4.42.85.99.29 Fax: +33 (0)4.42.85.99.66.

2.B.3. Embodiment of MOD 0726478R2 on the sliding cow ling rails and shims in the attachment areas on

Frame 5295

- Remove the sliding cowling as per MET Work Card 53.50.00.403.

As per Figure 5

- On the LH and RH rail, identify particularly the two a ttachment holes (b) and the two attachment screws (a)

at Frame 5295. - Before removal, identify the pos ition of the screws and the shims. - Remove the rail, if necessary.

- Retain all the removed hardware. - Mark and cut the rail as per Detail B. - Cut the corresponding shims to match the cut-out in the rails. - Deburr the shims and the rails and remove sharp edges. - Touch up the reworked areas with ALOD INE as per MTC Work Card 20.04.04.403. - Touch up the EPOXY P05 primer paint and the top coat paint as per MTC Work Cards 20.04.05.402 and

403.

- Install the shims and the rails. - Fit one or two washers, both items (1) and (2), on t he two LH side and two RH side screws (a), in order to

compensate for the thickness of the rail and the sh ims, as per Detail C (Pre-MOD 0722828) or Detail D (Post-MOD 0722828). - Apply a layer of MASTINOX sealant to the shank of screws (a). - Install the two screws (a) on the RH side and the tw o screws (a) on the LH side of the helicopter, equipped

with washers (1) and (2). - Apply a bead of sealant (3) around the heads of the screws and the rails as per Detail C or Detail D. - Remove excess sealant (3). - Install the sliding cowling as per MET Work Card 53.50.00.403 and check the sliding cowling as per MET

Work Card 53.50.00.601.

### ALERT SERVICE BULLETIN AS332

Approved under EASA DOA No. 21J.056. 

# 05.00.76 Page 9/16

2008.02.20 2.C. IDENTIFICATION

Record initial compliance with this ALERT SERVICE BULLETIN in the aircraft documents. Following compliance with paragraph 2.B.3., record embodiment of MOD 0726478R2 in the aircraft

documents.



### 2.D. OPERATING AND MAINTENANCE INSTRUCTIONS

Not applicable.

### ALERT SERVICE BULLETIN AS332

Approved under EASA DOA No. 21J.056. 

# 05.00.76 Page 10/16

2008.02.20 Figure 1 

### Frame X5295 Frame X5295

### ALERT SERVICE BULLETIN AS332

Approved under EASA DOA No. 21J.056. 

# 05.00.76 Page 11/16

2008.02.20 Crack in the outer

skin and in the butt strap

Figure 2 

### Area 1

Frame X5295

Cowling rail

### ALERT SERVICE BULLETIN AS332

Approved under EASA DOA No. 21J.056. 

# 05.00.76 Page 12/16

2008.02.20 AREA 1 at the attachment screws of the sliding cowling upper rail

Figure 3 

### Area 1 : With black marks indicating movements in the

area.



### Frame X 5295 - View looking forward 

## Area 1

### ALERT SERVICE BULLETIN AS332

Approved under EASA DOA No. 21J.056. 

# 05.00.76 Page 13/16

2008.02.20 Figure 4 

### Cracks

Crack in outer skin

Frame 5295 

### Frame X 5295 - View looking aft INACCESSIBLE AREA

ACCESSIBLE AREA Fitting (d) Stringer gusset (c)

### ALERT SERVICE BULLETIN AS332

Approved under EASA DOA No. 21J.056. 

# 05.00.76 Page 14/16

2008.02.20 Figure 5 View Post-MOD 0726478R2 View Pre-MOD 0726478R2

Post-MOD 0722828 Pre-MOD 0722828

### ALERT SERVICE BULLETIN AS332

Approved under EASA DOA No. 21J.056. 

# 05.00.76 Page 15/16

2008.02.20 

### 3. MATERIAL INFORMATION

3.A. MATERIAL: COST - AVAILABILITY

Not applicable.



### 3.B. INFORMATION CONCERNING INDUSTRIAL SUPPORT

Not applicable.



### 3.C. MATERIAL REQUIRED FOR EACH HELICOPTER, ENGINE/COMPONENTS

3.C.1. Kit or component(s) to be ordered

New Part Number Qty Item Key Word Former Part Number Instructions Disposition

23111AG050LE 8 1 Washer

23119AG050LE 8 2 Washer

3.C.2. Product(s) to be ordered separately

New Part Number Qty Item Key Word Former Part Number Instructions Disposition

* PR1771B2SEMK654 AR 3 Sealing compound

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 AS332

Approved under EASA DOA No. 21J.056. 

# 05.00.76 Page 16/16

2008.02.20 3.D. MATERIAL REQUIRED FOR EACH SPARE PART

Not applicable.



### 3.E. RE-IDENTIFIED PARTS

Not applicable.



### 3.F. TOOLING: COST - AVAILABILITY

Not applicable.



### 3.G. PROCUREMENT CONDITIONS

Order the required quantity (unless otherwise specified)

from

EUROCOPTER Etablissement de Marignane

Direction Ventes et Relations 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 numbers of the aircraft to be

modified.



### 4. APPENDIX

Not applicable.