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 CEDEX FRANCE 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 

 

 
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1. PLANNING INFORMATION 

1.A. EFFECTIVITY 

1.A.1. Helicopters/Installed equipment: 

- Helicopters equipped with GOODRICH electric hoists 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 Airworthiness 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 cancels 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 connection (short circuit) of the motor brush power 

supply wiring with the hoist casing during ground 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. 
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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 the 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 this ALERT SERVICE BULLETIN mandatory. 

1.E.1. Compliance at the works 

1.E.1.a. On helicopters/installed equipment: Before 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 helicopters subject to an Airworthiness Certificate. 

The information or instructions relate to change: MOD No. 073318 which was approved by the DGAC by 

means of Aircraft Modification Approval Form (FAM) 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. 
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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. 
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2. ACCOMPLISHMENT INSTRUCTIONS 

2.A. GENERAL 

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

Card 24.00.00.301. 

Before you start work on the squib, comply with 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 Work 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 according to both the helicopter version and the embodied 

modifications. Refer to this table to define the paragraph 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 modifications 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 terminals 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. 
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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 terminals 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 circuit board 22 alpha (h) without disconnecting it, in order 

to gain access to terminal strip 22 alpha 2G (i) which 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 printed 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 circuit board 22 alpha (h) without disconnecting it, in order 

to gain access to terminal strip 22 alpha 2G (i) which 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 printed 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. 
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2.B.3. Check for elimination of the ground on the hoist squib electrical circuit (Figure 7) 

- Make sure that the squib is removed. 

- Energize the helicopter electrical power systems as per MET Work 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 pilot 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 installed) on the copilot collective lever, and hold the 

pushbutton in the pressed position. 

. Check that the voltage at the terminals 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 secures 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 SERVICE BULLETIN in the aircraft documents. 

2.D. OPERATING AND MAINTENANCE INSTRUCTIONS 

Not applicable. 
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Figure 1: Printed circuit board 25 delta 
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Figure 2: Elimination of the ground from printed circuit board 25 delta 
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Figure 3: Printed circuit board 20 alpha 
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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) 
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Figure 5: Printed circuit board 22 alpha 
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Figure 6: Elimination of the ground from printed circuit board 22 alpha 
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Figure 7: Location of the squib 
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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. 
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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.