# eurocopter an EADS Company 

### ALERT SERVICE BULLETIN AS332 EUROCOPTER DIRECTION TECHNIQUE SUPPORT 13725 MAR IGNANE CEDEX FRANCE 

### CIVIL VERSION(S) : L2 

# ALERT SERVICE BULLETIN No. 05.00.71 SUBJECT: TIME LIMITS -MAINTENANCE CHECKS Life Raft- Inflation Cylinder


### ATA : 25 

## L--------------------------------------------------------------··-- REVISION No. DATE OF APPROVAL

Revision 0 On : July 31, 2007

Approved under EASA DOA No . 21J .056. 

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

### DATE OF ISSUE 2007 .07.31

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### ALERT SERVICE BULLETIN AS332 1. PLANNING INFORMATION 1.A. EFFECTIVITY 1.A. 1 . Helicopters/Installed equipment Helicopters equipped with life raft P/N 00051047 or P/N 00051048. 1.A.2. Non-installed equipment Life raft inflation cylinder P/N 41918001 . Life raft P/N 00051 047. Life raft P/N 00051048. 

### 1.8. ASSOCIATED REQUIREMENTS Not applicable. 

### 1.C. REASON To prevent internal damage to the inflation cylinder due to interference between the plunger tube and the internal skin of the

**infla~ion** cylinder. This ALERT SERVICE BULLETIN will form the subject of an EASA Airworthiness Directive . 

### 1.D. DESCRIPTION EUROCOPTER has received a report of wear on the internal skin of the inflation cylinder. This wear was revealed by a borescope inspection during a scheduled maintenance operation. The plunger tube end is fitted with a metal end-fitting that bears against the internal surface of the cylinder. Vibrations generated by the helicopter are causing wear on the internal skin of the cylinder, which can cause the internal pressure of the cylinder to drop . In this case , life raft inflation would no longer be possible . Pending a modifi cation to th e infl atio n cylinde r, EUROCOPTER rend ers compliance with thi s ALERT SERV ICE BULLET IN mandatory.



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### ALERT 

### SERVICE BULLETIN 

### AS332 1.E. COMPLIANCE EUROCOPTER renders compliance with this 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 operation: By the operator: 1.E .2.a . On helicopters/installed equipment: From receipt of this ALERT SERVICE BULLETIN , issued on the date indicated at the foot of the page :

- For helicopters fitted with inflation cylinders having logged 2 ,500 flying hours or more , since last overhaul

(TSO) or since new (TSN):

. Comply with paragraph 2 . of this ALERT SERVICE BULLETIN at the latest within 100 flying hours. 1 .E .2 .b . On non-installed equipment:

- For inflation cylinders having logged 2 ,500 flying hours or more, since last overhaul {TSO) or since new

(TSN) :

. Comply with paragraph 2 . of this ALERT SERVICE BULLETIN before installation on a helicopter. 

### 1.F. APPROVAL Approval is limited to civil version helicopters subject to an Airworthiness Certificate . The technical information given in Revision 0 of this ALERT SERVICE BULLETIN was approved on July 31 , 2007 under the authority of EASA Design Organisation Approval No . 21 J .056 .



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### ALERT 

### SERVICE BULLETIN 

### AS332 1.G. MANPOWER Qualification : 1 mechanic. Time for the operations: Approximately 1 hour and 30 m inutes for one cylinder. 

### 1.H. WEIGHT AND BALANCE Not app licab le. 

### 1.1. EFFECT ON ELECTRICAL LOADS Not app licable. 

### 1.J. SOFTWARE MODIFICATION EMBODIMENT STATE Not applicab le . 

### 1 .K. REFERENCES MMA: 25-66-01-821: Adjustment- Ground testing of the life raft inflation control MTC : 20.02.07 . 101: Electrical bonding - General 20 .02 .07.401: E lectrical bonding- Bonding procedure CMM : 25-60-96. 

### 1.L. OTHER DOCUMENTS CONCERNED The Maintenance Program (PRE) and the Aircraft Maintenance Manual (MMA) will be updated subsequently. 

### 1.M. TOOLING CONCERNED Not applicable. 

### 1.N. INTERCHANGEABILITY AND MIXABILITY OF PARTS Not applicable .



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### ALERT SERVICE BULLETIN AS332 

### 2. ACCOMPLISHMENT INSTRUCTIONS 2.A. GENERAL -The operations specified in Appendix 1 are described for the inflation cylinder installed in the LH sponson

of the helicopter and are the same for the inflation cylinder installed in the RH sponson. 

### 2.8. OPERATIONAL PROCEDURE 2.B.1. Pre liminary steps

- Install the access equipment.

- Do the operations described in Appendix 1 paragraphs 1. and 2 . 2 .B.2. Procedure

- Remove the inflation cylinder (d) in compliance with Appendix 1 paragraph 3 . 1.

- Return the inflation cylinder {d) to an approved workshop for a borescope inspection in accordance with

CGA C .6.2 . standard (Revision 2005) .
- Install the inflation cylinder {1) in compliance with Appendix 1 paragraph 3.2 . 2.B.3. Tests

- Do the operations specified in Appendix 1 paragraph 3.3. 2.B.4. Final steps

- Do the operations specified in Appendi x 1 paragraph 4.

- Remove the access equipment. 

### 2.C. IDENTIFICATION Record initial compliance with this ALERT SERVICE BULLETIN in the helicopter documents . Record compliance with this ALERT SERVICE BULLETIN on the log card of the inflation cylinder. 

### 2.D. OPERATING AND MAINTENANCE INSTRUCTIONS 2.0 . 1. Operating In structions: Not applicable .



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### ALERT SERVICE BULLETIN AS332 2.0.2 . Maintenance Instructions Pending update of the Maintenance Program (PRE) for life raft inflation cylinders P/N 41918001 , EUROCOPTER recommends the following maintenance procedure : Description, Documentation Part Number TL Limit CYLINDER 41918001 TBO 2500H //3Y 3Y : Time limit since new. Overhaul and proof test the cylinders . Time lim it with no to lerance. Rece1pt of the above Ma1ntenance Program (PRE) update w1ll cancel compliance w1th th1s ma1ntenance instruction. CL *



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### ALERT SERVICE BULLETIN AS332 

### 3. MATERIAL INFORMATION 3.A. MATERIAL: COST- AVAILABILITY 3.A.1 . Cost Not appl icab le. 3.A.2. Ava ilab ility Not appl icable . 

### 3.8. INFORMATION CONCERNING INDUSTRIAL SUPPORT Not applicable . 

### 3.C. MATERIAL REQUIRED FOR EACH HELICOPTER/ENGINE/COMPONENT 3.C. 1 . Kit(s) or component(s) to be ordered for one helicopter or one assembly Material Part Number

41918001 Qty Item 

### NR 3.C .2 . ltem(s) to be ordered separately Not applicable .



### Approved under EASA DOA No . 21J .056. Key Word Former Part Number Inflation cylinder 41918001



# 05.00.71 Instructions Return



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### AS332 3.0. PROCUREMENT CONDITIONS Order the required quantity (unless otherwise specified) from EUROCOPTER Etablissement de Marignane Direction Ventes et Relations Client ECR 13725 MARIGNANE CEDEX FRANCE 

### NOTE1 ForALERT SERVICE BULLETINS, order by :



### 4. APPENDIX Telex: HELICOP 410 969F Fax: +33 (0)4 42 85 99 96 

### NOTE2 On the purchase order , please specify the mode oftransport , the destination and the serial numbers ofthe heiicopters to be modified. Appendix 1 describing the procedure for removing/installing life raft inflation cyl inders .



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### ALERT SERVICE BULLETIN AS332 Removal/Installation of the life raft inflation cylinder 1. EQUIPMENT REQUIRED 1 . 1 . Special tools -Safety pin (c) P/N 40247001 (from the aircraft tool kit). 1.2 . Materials

- Snap wire, 0.3 mm (0.012 in) diameter, P/N 23321 .
- Petro latum AIR 3565/A.

- Nylon cord, capacity : 180 kg (z) (See CMM 25-60-96, P/N 02226005). -Adhesive tape. 1.3. Routine replacement parts None . 1.4. Applicable documents

- Aircraft Maintenance Manual (MMA): 25-66-01-821 Adjustment - Ground testing of the life raft inflation control. -Standard Practices Manual (MTC): 20 .02 .07 .10 1 Electrical bonding- General. 20.02 .07.401 Electrical bonding - Bonding procedure

- Component Maintenance Manual (CMM) : 25-60-96. 2. PRELIMINARY STEPS

- Cut the 0 .3 mm (0 .012 in) snap wire of the frangible covers (a) (Figure 1) . -Remove the frangible covers (a) from the release latches (b) . -Unlock the cover (o).

- Disconnect the bonding braid between the cover (o) and the sponson .

- Remove the cover (o).

- Install the safety pin (c) on the firing head (f) . -Lift the upper flap (p) (Figure 2) and attach it to the sponson with adhesive tape . Put rags between the life raft and the compartment walls to avoid dropping objects (washer , pin, etc.) under the life raft. 

### 3. PROCEDURE 3.1. Removing the cyl in der

- Remove the cotter pin (m) (Figure 1) and the washer 

### (1).

- Note the position of the bellcrank pin (k) .
- Remove the bellcrank pin (k) and clear the firing cable (n) from the bellcrank (g). -Attach the firing cable (n) to the firing head (f) with adhesive tape.

- Disconnect the inflation hose (x) (Figure 2) from the firing head (f).

- Blank off the firing head (f), and the inflation hose (x) with one blank each.

- Remove the short strap (r) and the long strap (s) . Appendix 1 

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### ALERT 

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### AS332

- Hold the pin (h) (Figure 1), then pivot the bellcrank (g) so that the rod 

### U) can be removed .

- Remove the washer (i) , the pin (h) and the upper part of the attachment clamp (e) .

- Remove the cylinder (d) .

- Mark the serial number of the life raft on a label and affi x this label to the cylinder {d) .

- Remove the firing head (f) from the cylinder {d) , refer to CMM 25-60-96. 3 .2. Installing the cylinder -Check that the safety pin (c) is in place on the cylinder (1) firing head. -Install the firing head (f) on the cyl inder (1 ) , refer to CMM 25-60-96.

- Apply S-743 petrolatum to the surface that comes into contact with the bottom of the cylinder (1 ).

- If not fitted , position and attach self-gripping "Velcro" hook/loop fasteners on the cylind er (1 ) . -Attach the long strap (s) on the cylinder (1 ). The mooring lines (u) (Figure 2) must be positioned behind the cylinder (1) . -If necessary , use adhesive tape to attach the mooring lines (u) to the upper flap (p).

- Put the cylinder (1) and the long strap (s) in the compartment. -Attach the long strap (s) to the self-gripping "Velcro" hook/loop fastener of the lower flap (v) . -Install the flange on the cylinder { 1) , level with attachment clamp (e) . -Install the upper part of clamp (e)

- Install the washer (i) (Figure 1) . One ofthe edges of washer (i) is rounded. The washer must be positioned in such a way that the rounded edge is visible.

- Pivot the bellcrank (g) in order to insert the rod 

### U) into the pin {h) .

- Remove the blanks from the firing head (f) and from the inflation hose (x) (Figure 2).

- Remove the adhesive tape from the pin (h) (Figure 1) .

- Connect the inflation hose (x) (Figure 3) to the firing head (f) , then torque tighten it as specified on

Figure 3 . -Attach the strap (w) around the firing head (f) us ing Nylon cord (z) (capacity 1 80 kg) .

- Take the short strap (r) (Figure 2) and attach one of its ends to the lower flap (v) and the other end to

th e upper part of th e cylinder (1 ). -Remove th e adhesive tape (if fitted) attach ing the mooring lin es (u) to th e upper flap (p). 3.3. Tests Run the tests in compl iance with Task 25-66-01-821 paragraph 3.2 .

Appendi x 1 

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### ALERT SERVICE BULLETIN AS332 4. FINAL STEPS

- Remove the rags which were put in place in the compartment. -Remove the adhesive tape from the upper flap (p) (Figure 2) and fold it over.

- Check that the compartment handle (y) is correctly positioned .
- Remove the safety pin (c) (aircraft tool kit) (Figure 1 ). -Offer up the cover (o).

- Check that, when full , the fabric container (q) (Figure 2) does not touch the internal face of the cover (o)

(Figure 1). -Con nect the electrical bonding braid as per MTC 20 .02.07 . 101 and MTC 20.02.07.401 .
- Lock the cover (o) . -In stall the frangible covers (a) on the release latches (b) of the cover (o).

- Install the 0 .3 mm (0 .012 in) diameter snap wire on the frangible protections (a) .

Appendi x 1 

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Approved under EASA DOA No . 21J .056 . 

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## p

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