### ALERT SERVICE BULLETIN AS350

Approved under EASA DOA No. 21J.056. 

# 25.00.95 Page 1/16

2005.11.16 EUROCOPTER

DIRECTION TECHNIQUE SUPPORT

13725 MARIGNANE C EDEX F RANCE 

### CIVIL VERSION(S): B,BA,BB,B1,B2,B3,D MILITARY VERSION(S): L1 

# ALERT SERVICE BULLETIN

No. 25.00.95

SUBJECT : EQUIPMENT AND FURNISHINGS

Elimination of a Ground Connection on the Hoist Squib Wiring

Embodiment of MOD 073318

REVISION No. DATE OF APPROVAL DATE OF ISSUE

Revision 0 Date: November 15, 2005 2005.11.16

### ALERT SERVICE BULLETIN AS350

Approved under EASA DOA No. 21J.056. 

# 25.00.95 Page 2/16

2005.11.16 

### 1. PLANNING INFORMATION

1.A. EFFECTIVITY

1.A.1. Helicopters/Installed equipment:

- Helicopters equipped with GOODRICH electric hoist s P/N 76370-XXX (all types of motors), and not

modified per modification 073318,

and - GOODRICH electric hoists P/N 76370-XXX, not equipped with the AUXILEC motor, and modified in

compliance with ALERT TELEX No. 25.00.94, issued on May 25, 2005.



### NOTE

Helicopters delivered as from 01/01/2006 will incorporate

modification 073318. Refer to the aircraft Certificate of Conformity (or RIC - Aircraft Individual Inspection Log Book) to identify compliance with this ALERT SERVICE

BULLETIN or embodiment of modification 073318.

1.A.2. Non-installed equipment:

GOODRICH electric hoists P/N 76370-XXX, not equipped with the AUXILEC motor, and modified in compliance with ALERT TELEX No. 25.00.94, issued on May 25, 2005.



### 1.B. ASSOCIATED REQUIREMENTS

Not applicable.



### 1.C. REASON

This ALERT SERVICE BULLETIN which will form the subject of an Airwor thiness Directive to be issued by the DGAC on behalf of the EASA, enables you to embody modification 073318 in order to eliminate the risk of untimely squib firing on GOODRICH electric hoists.

Compliance with Revision 0 of this ALERT SERVICE BULLETIN No. 25.00.95 canc els the instructions introduced by ALERT TELEX No. 25.00.94.

Revision 0 of ALERT SERVICE BULLETIN No. 25.00.94 makes this information official.



### 1.D. DESCRIPTION

Following a case of hoist squib firing due to ground c onnection (short circuit) of the motor brush power supply wiring with the hoist casing during gr ound operation, EUROCOPTER issued ALERT TELEX No. 25.00.94 in order to inhibit the squib function and impose the use of the manual cable cutter.

### ALERT SERVICE BULLETIN AS350

Approved under EASA DOA No. 21J.056. 

# 25.00.95 Page 3/16

2005.11.16 This ALERT SERVICE BULLETIN enables you to embody modification 073318. This modification eliminates the risk of untimely squib firing in the event of a short circuit occurring on the hoist. This modification consists in disconnecting or eliminating (according to t he helicopter version) a squib grounding wire.

Consequently, EUROCOPTER renders compliance with this ALERT SERVICE BULLETIN, mandatory, in

order to: - embody modification 073318, precluding the risk of untimely firing of the hoist squib, - make the cable cutter squib operational, in order to return to the configuration before compliance with

ALERT TELEX No. 25.00.94.



### 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/installed equipment: Be fore delivery, comply with paragraph 2.B.

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

1.E.2. Retrofit action: By the operator.

1.E.2.a. On helicopters/installed equipment: Comply with paragraph 2.B. within 30 days following receipt of this ALERT SERVICE BULLETIN, issued on the date indicated in the

footer.

1.E.2.b. On spares: Before installation on a helicopter, comply with paragraph 2.B.



### 1.F. APPROVAL

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

The information or instructions relate to c hange: MOD No. 073318 which was approved by the DGAC by means of Aircraft Modification Approval Form (F AM) 073318 edition 1, on October 20, 2005, in accordance with article 10.3 of EC regulation No. 1592/2002.

The technical information contained in this ALERT SERVICE BULLETIN was approved on November 15, 2005 under the authority of EASA Design Organisation Approval No. 21J.056.



### 1.G. MANPOWER

Qualification: 1 electrician. Time: Approximately 2 hours.

### ALERT SERVICE BULLETIN AS350

Approved under EASA DOA No. 21J.056. 

# 25.00.95 Page 4/16

2005.11.16 1.H. WEIGHT AND BALANCE

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 24. 00.00.301; 25.63.00.403; 25. 63.00.602; 25.81.10.501;

53.00.00.405.

Standard Practices Manual: Work Card 20.07.02.211.



### 1.L. OTHER DOCUMENTS CONCERNED

Not applicable.



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

Not applicable.

### ALERT SERVICE BULLETIN AS350

Approved under EASA DOA No. 21J.056. 

# 25.00.95 Page 5/16

2005.11.16 

### 2. ACCOMPLISHMENT INSTRUCTIONS

2.A. GENERAL

Before you start work on the electrical systems, comp ly with the general instructions as per MET Work

Card 24.00.00.301. Before you start work on the squib, comply wi th the general instructions as per MTC Work

Card 20.07.02.211.



### 2.B. OPERATIONAL PROCEDURE

2.B.1. Preliminary steps

- De-energize the aircraft electrical power systems as per MET Wo rk Card 24.00.00.301. - Remove the squib from the hoist as per MET Work Card 25.63.00.403.

- Make sure that the hoist mission selector switch is set to "OFF".

2.B.2. Elimination of the ground on the hoist squib wiring (MOD 073318)

The table below indicates several configurations a ccording to both the helicopter version and the embodied modifications. Refer to this table to define the paragr aph to be applied in order to eliminate the ground from the hoist squib.

Version B Version D Version B1 Version L1 Versions BA,BB,B2,B3

POST MOD 070379

and

PRE MOD 071502 Paragraph

2.B.2.b. Paragraph

2.B.2.b.

POST MOD 071502

and

PRE MOD 071834 Paragraph

2.B.2.c. Paragraph

2.B.2.c.

POST MOD 071834 Paragraph

2.B.2.e. Paragraph

2.B.2.e. Paragraph

2.B.2.e. Paragraph

2.B.2.e.

Other modifications

embodied Paragraph

2.B.2.a. Paragraph

2.B.2.a. Paragraph

2.B.2.c. Paragraph

2.B.2.d. Paragraph

2.B.2.e.

2.B.2.a. Versions B and D, embodying none of the modificati ons listed in the table in paragraph 2.B.2. (Figure 1) (Figure 2)

- Remove the front lower fairing as per MET Work Card 53.00.00.405. - Remove the cover (a) from unit 25 delta. - Eliminate wire AK4E (c) that is connected to te rminals 8 and 11 of terminal strip 25 delta 1 (b). - Install the cover (a) of unit 25 delta. - Install the front lower fairing as per MET Work Card 53.00.00.405.

### ALERT SERVICE BULLETIN AS350

Approved under EASA DOA No. 21J.056. 

# 25.00.95 Page 6/16

2005.11.16 2.B.2.b. Versions B and D, POST MOD 070379 and PRE MOD 071502 (Figure 1) (Figure 2)

- Remove the front lower fairing as per MET Work Card 53.00.00.405. - Remove the cover (a) from unit 25 delta. - Eliminate wire AK4E (c) that is connected to te rminals 16 and 11 of terminal strip 25 delta 1 (b). - Install the cover (a) of unit 25 delta. - Install the front lower fairing as per MET Work Card 53.00.00.405.

2.B.2.c. Versions B and D, POST MOD 071502 and PRE MOD 071834; version B1 PRE MOD 071834 (Figure 3) (Figure 4)

- Remove the front lower fairing as per MET Work Card 53.00.00.405. - Remove the cover (d) from unit 20 alpha. - Disconnect wire AK3NE (f) from terminal 21 of terminal strip 20 alpha C (e). - Insulate wire AK3NE (f) with heat-shrink cap (1). - Install cover (d) of unit 20 alpha. - Install the front lower fairing as per MET Work Card 53.00.00.405.

2.B.2.d. Version L1 PRE MOD 071834 (Figure 5) (Figure 6)

- Remove the front lower fairing as per MET Work Card 53.00.00.405. - Remove the cover (g) from unit 22 alpha. - Remove the attachments that secure printed circ uit board 22 alpha (h) without disconnecting it, in order

to gain access to terminal strip 22 alpha 2G (i) whic h is located on upper printed circuit board 22 alpha 2.



### NOTE

Helicopters equipped with a swiveling landing light are fitted with additional printed circuit board 24 alpha (j).

- Disconnect wire AK3NE (k) from terminal G8. - Insulate wire AK3NE (k) with heat-shrink cap (1). - Attach printed circuit board 22 alpha (h), and pr inted circuit board 24 alpha (j) if installed. - Install cover (g) of unit 22 alpha. - Install the front lower fairing as per MET Work Card 53.00.00.405.

2.B.2.e. Versions B, D, B1, and L1, POST MOD 071834; versions BA, BB, B2, B3 (Figure 5) (Figure 6)

- Remove the front lower fairing as per MET Work Card 53.00.00.405. - Remove the cover (g) from unit 22 alpha. - Remove the attachments that secure printed circ uit board 22 alpha (h) without disconnecting it, in order

to gain access to terminal strip 22 alpha 2G (i) whic h is located on upper printed circuit board 22 alpha 2.



### NOTE

Helicopters equipped with a swiveling landing light are fitted with additional printed circuit board 24 alpha (j).

- Disconnect wire ME35NE (k) from terminal G8. - Insulate wire ME35NE (k) with heat-shrink cap (1). - Attach printed circuit board 22 alpha (h), and pr inted circuit board 24 alpha (j) if installed. - Install cover (g) of unit 22 alpha. - Install the front lower fairing as per MET Work Card 53.00.00.405.

### ALERT SERVICE BULLETIN AS350

Approved under EASA DOA No. 21J.056. 

# 25.00.95 Page 7/16

2005.11.16 2.B.3. Check for elimination of the ground on t he hoist squib electrical circuit (Figure 7)

- Make sure that the squib is removed. - Energize the helicopter electrical power systems as per MET Wo rk Card 24.00.00.301.

- Set the mission selector switch to "HOIST". - Remove the heat-shrink sheath that insulates lug (m). - Connect a multimeter between lug (m) and the helicopter ground (hoist frame).

. The measured value must be infinite. - Press the manual-release control pushbutton on the p ilot collective lever, and hold the pushbutton in the

pressed position. . Check that the voltage at the multimeter terminals is 28 V. - Press the manual-release control pushbutton (if insta lled) on the copilot collective lever, and hold the

pushbutton in the pressed position. . Check that the voltage at the term inals of the multimeter is 28 V. - On helicopters equipped with a cargo sling hook, check that the sling electric release control operates

correctly, as per MET Work Card 25.81.10.501.

2.B.4. Returning the hoist squib to an operational condition (Figure 7)

- Install the access equipment. - On conductor (n), cut the cable tie that se cures cap assembly (l) and insulated lug (m). - Install the hoist squib as per MET Work Card 25.63.00.403. - Check the squib electrical system as per MET Work Card 25.63.00.602. - Remove the access equipment.

- Remove the two labels affixed on the instrument panel and near the hoist operator, when compliance was

ensured with ALERT TELEX No. 25.00.94.



### 2.C. IDENTIFICATION

Record compliance with this ALERT SERVI CE BULLETIN in the aircraft documents.



### 2.D. OPERATING AND MAINTENANCE INSTRUCTIONS

Not applicable.

### ALERT SERVICE BULLETIN AS350

Approved under EASA DOA No. 21J.056. 

# 25.00.95 Page 8/16

2005.11.16 Figure 1: Printed circuit board 25 delta

### ALERT SERVICE BULLETIN AS350

Approved under EASA DOA No. 21J.056. 

# 25.00.95 Page 9/16

2005.11.16 Figure 2: Elimination of the ground from printed circuit board 25 delta

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Approved under EASA DOA No. 21J.056. 

# 25.00.95 Page 10/16

2005.11.16 Figure 3: Printed circuit board 20 alpha

### ALERT SERVICE BULLETIN AS350

Approved under EASA DOA No. 21J.056. 

# 25.00.95 Page 11/16

2005.11.16 Figure 4: Elimination of the ground from printed circuit board 20 alpha (helicopter versions B and D, POST MOD 071502 and PRE MOD 071834; helicopter version B1 PRE MOD 071834)

### ALERT SERVICE BULLETIN AS350

Approved under EASA DOA No. 21J.056. 

# 25.00.95 Page 12/16

2005.11.16 Figure 5: Printed circuit board 22 alpha

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Approved under EASA DOA No. 21J.056. 

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2005.11.16 Figure 6: Elimination of the ground from printed circuit board 22 alpha

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Approved under EASA DOA No. 21J.056. 

# 25.00.95 Page 14/16

2005.11.16 Figure 7: Location of the squib

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Approved under EASA DOA No. 21J.056. 

# 25.00.95 Page 15/16

2005.11.16 

### 3. MATERIAL INFORMATION

3.A. MATERIAL: COST – AVAILABILITY

For any information, contact the Customer Service Sales Department.



### 3.B. INFORMATION CONCERNING INDUSTRIAL SUPPORT

Not applicable.



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

3.C.1. Component(s):

New Part Number Qty Item Key Word Former Part

Number Instructions Disposition E0737R1332 1 1 Heat-shrink cap

3.C.2. Material to be ordered separately:

Not applicable.

3.C.3. Tooling:

Not applicable.



### 3.D. MATERIAL REQUIRED FOR EACH SPARE PART

Not applicable.



### 3.E. RE-IDENTIFIED PARTS

Not applicable.

### ALERT SERVICE BULLETIN AS350

Approved under EASA DOA No. 21J.056. 

# 25.00.95 Page 16/16

2005.11.16 3.F. TOOLING: COST – AVAILABILITY

For any information, contact the Customer Service Sales Department.



### 3.G. PROCUREMENT CONDITIONS

Order the required quantity (unless otherwise specified)

from

EUROCOPTER Etablissement de Marignane

Direction VENTES Service Client

S.V.

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.