### T.F.S. No. 00000524

Approved under EASA DOA No. 21J.056 Page 1/11

2009.05.13

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

DIRECTION TECHNIQUE SUPPORT

13725 MARIGNANE C EDEX F RANCE



# EMERGENCY 

# ALERT SERVICE BULLETIN

DAUPHIN NUMBER VERSIONS

Civil : N, N1 

# AS365 01.00.63

Military: F, Fi, Fs, K



### SUBJECT: LIMITATIONS

Limited fuel transfer between fuel tank groups

ATA : 28

REVISION NUMBER DATE OF APPROVAL DATE OF ISSUE

Revision 0 On: May 04, 2009 2009.05.05

Revision 1 On: May 13, 2009 2009.05.13

### T.F.S. No. 00000524

Approved under EASA DOA No. 21J.056 Page 2/11

2009.05.13 THE INFORMATION AND INSTRUCTIONS

CONTAINED IN THIS ALERT SERVICE BULLETIN

ARE INTENDED FOR MAINTENANCE PERSONNEL

AND FLIGHT CREWS.



### 1. PLANNING INFORMATION

1.A. EFFECTIVITY

1.A.1. Helicopters/installed equipment

Helicopters that do not embody modification 0728B17 or kit 365A087690.00.



### NOTE 1

The embodiment of modification 0728B17 or kit

365A087690.00 removes the two high level switches

on helicopters equipped with a crossfeed between the

fuel filler necks.



### NOTE 2

Refer to the aircraft individual inspection record (MOD

record), the equipment log cards (FMs) or the aircraft

log book to identify the act ual configuration of the

helicopter.

1.A.2. Non-installed equipment

Not applicable.



### 1.B. ASSOCIATED REQUIREMENTS

Not applicable.



### 1.C. REASON

Revision 0:

To preclude the risk of a short circuit on the high le vel switches and to limit the use of fuel transfer

between the fuel tank groups.

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

Revision 1:

Correct the position of the high-level switches.

Revision 1 does not affect revision 0 of this ALERT SERVICE BULLETIN.

Revision 1 of this ALERT SERVICE BULLET IN will not affect EASA Airworthiness

Directive 2009-0109-E that has been issued for the subject described in this ALERT SERVICE

BULLETIN. 

### CAUTION

### T.F.S. No. 00000524

Approved under EASA DOA No. 21J.056 Page 3/11

2009.05.13 

### 1.D. DESCRIPTION

A customer noted that the high level switch probe unit, located in the rear auxiliary fuel tank (RH

group) on an AS365 N helicopter, had separated.

The separation had damaged the electrical wires which supply the high level indicator light on the fuel

control panel during a fuel transfer. If bared, these el ectrical wires can cause a short circuit which can

lead to untimely lighting of the indicator light (without the high fuel level actually being reached), or to

explosion of the fuel tank wi th the presence of fuel vapor.

Therefore, to prevent any explosion, this ALERT SERVICE BULLETIN makes it mandatory to

disconnect the high level switches on helicopt ers which do not embody modification 0728B17 or

kit 365A087690.00.

Compliance with this ALERT SERVICE BULLETIN results in the high level indicating system being

inhibited and therefore the crew will no longer be info rmed of the risk of fuel ov erflowing from the fuel

tank vents when fuel is transferr ed between the fuel tank groups.

Consequently, EUROCOPTER authorizes the pilots of the helicopters concerned by this ALERT

SERVICE BULLETIN, to transfer fuel between the fuel tank groups only if the group receiving the fuel

contains less than 300 liters (240 kg or 529 lb.), in order to prevent the risk of overflowing.



### 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

Not applicable.

1.E.1.b. On non-installed equipment

Not applicable.

### T.F.S. No. 00000524

Approved under EASA DOA No. 21J.056 Page 4/11

2009.05.13 1.E.2. Compliance in service: By the operator

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

Comply with paragraph 2. of this ALERT SERVICE BULLETIN at the latest within 10 flying hours,

without exceeding 30 days, following receipt of this ALERT SERVICE BULLETIN, issued on the

date indicated at the foot of the page.

1.E.2.b. On non-installed equipment

Not applicable.



### 1.F. APPROVAL

Approval is limited to civil version helicopte rs subject to an Airworthiness Certificate.

1.F.1. Approval of the modifications

Not applicable.

1.F.2. Approval of the Service Bulletin

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

on May 04, 2009 under the authority of EASA De sign Organisation Approval No. 21J.056.

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

on May 13, 2009 under the authority of EASA De sign Organisation Approval No. 21J.056.



### 1.G. MANPOWER

1.G.1. Qualification

Electrician.

1.G.2. Time for the operations

20 minutes.

1.G.3. Estimated helicopter grounding time

Not applicable.



### 1.H. WEIGHT AND BALANCE

Not applicable.



### 1.I. EFFECT ON ELECTRICAL LOADS

Not applicable.

### T.F.S. No. 00000524

Approved under EASA DOA No. 21J.056 Page 5/11

2009.05.13 

### 1.J. SOFTWARE MODIFICATION EMBODIMENT RECORD

Not applicable.



### 1.K. REFERENCES

Maintenance Manual (MET):

Work Card 24.00.00.300.

Standard Practices Manual (MTC):

Work Card 20.07.03.406.



### 1.L. OTHER DOCUMENTS AFFECTED

Not applicable.



### 1.M. TOOLING AFFECTED

Not applicable.



### 1.N. INTERCHANGEABILITY OR MIXABILITY OF PARTS

Not applicable.

### T.F.S. No. 00000524

Approved under EASA DOA No. 21J.056 Page 6/11

2009.05.13 

### 2. ACCOMPLISHMENT INSTRUCTIONS

2.A. GENERAL

- Before doing any work, refer to the general safety instructions concerning the electrical power system

as per MET Work Card 24.00.00.300.



### 2.B. OPERATIONAL PROCEDURE

2.B.1. Disconnection of the switches (Figure 1)

Disconnect all electrical power supplies as per MTC Work Card 20.07.03.406.

Remove the fairings under the bottom structure to gain access to connectors 8Q and 9Q of high level

switches (b) and (a) located respectively on rear tank (c) of the RH group and cent er tank (d) of the LH

group. Disconnect connector 9Q from high level switch (a) on the LH center tank.

Protect, isolate and secure connector 9Q and the electr ical harness. If necessary, use cable ties (1).

Disconnect connector 8Q from high level switch (b) on the rear tank.

Protect, isolate and secure connector 8Q and the electr ical harness. If necessary, use cable ties (1).

Install the fairings that were removed previously under the bottom structure.

Connect all the electrical power supplies as per MTC Work Card 20.07.03.406.

2.B.2. Limitations for crews of helicopter versions that are not equipped with a crossfeed between

the fuel filler necks (Figures 2 and 3)



### NOTE 1

To check that there is a crossfeed between the fuel

filler necks, open the fuel tank filler door and note the

location of the overpressure valve (see Figure 3).



### NOTE 2

Version F is not concerned by the procedure below

because the "crossfeed bet ween fuel filler necks"

installation exists on the basic helicopter.

Produce a locally-made label (2) in accordance wi th Figure 2 and in accordance with the units

indicated by the fuel contents gage.

Affix label (2) near of the fuel panel so that the lim itations indicated on the label can be seen by the

pilot and copilot.

### T.F.S. No. 00000524

Approved under EASA DOA No. 21J.056 Page 7/11

2009.05.13 

### 2.C. IDENTIFICATION

Record first compliance with this ALERT SER VICE BULLETIN in the helicopter documents.



### 2.D. OPERATING AND MAINTENANCE INSTRUCTIONS

2.D.1. Operating instructions

Not applicable.

2.D.2. Scheduled maintenance instructions

Not applicable.

2.D.3. Unscheduled maintenance instructions

Not applicable.

### T.F.S. No. 00000524

Approved under EASA DOA No. 21J.056 Page 8/11

2009.05.13 

### Figure 1: High level switch installation and wiring 

# a

b

d c

1 1

### T.F.S. No. 00000524

Approved under EASA DOA No. 21J.056 Page 9/11

2009.05.13 

### Figure 2: Label Fuel transfer authorized only to fuel tank containing less than 240 kg 

# 2

Fuel transfer authorized only to fuel tank containing less than 529 lb. Fuel transfer authorized only to fuel tank containing less than 300 l

### T.F.S. No. 00000524

Approved under EASA DOA No. 21J.056 Page 10/11

2009.05.13 

### Figure 3: "Overpressure valve" installation 

### Location of the

overpressure valve

### T.F.S. No. 00000524

Approved under EASA DOA No. 21J.056 Page 11/11

2009.05.13 

### 3. MATERIAL INFORMATION

3.A. MATERIAL: PRICE AND AVAILABILITY

3.A.1. Cost

Not applicable.

3.A.2. Availability

Not applicable.



### 3.B. INFORMATION CONCERNING INDUSTRIAL SUPPORT

Not applicable.



### 3.C. MATERIAL REQUIRED FOR EACH HELICOPTER/ENGINE/COMPONENT

3.C.1. Kits or components to be ordered for one helicopter or one assembly

Not applicable.

3.C.2. Material to be ordered separately

Material P/N Qty Item Key Word Instructions

MP/N SAP

E0043-3C0 738945 AR 1 Cable tie



### 3.D. PROCUREMENT CONDITIONS

Not applicable.



### 4. APPENDIX

Not applicable.