# ASB No. AS355-28.00.20

Revision 0 2013-06-06 Page 1/12

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

### Civil version(s): E, F, F1, F2



# ALERT SERVICE BULLETIN

SUBJECT: FUEL

Removal of the FUELTRON flowmeter

Corresponds to modification 355A085801



### Revision No. Date of issue

Revision 0 2013-06-06



### Summary:

Removing and disabling the optional FUELTRON flowmeter installation.



### Compliance:

Compliance with this ALERT SERVICE BULLETIN is mandatory. For the attention of

# ASB No. AS355-28.00.20

Revision 0 2013-06-06 Page 2/12

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

### 1. PLANNING INFORMATION

1.A. EFFECTIVITY

1.A.1. Helicopters/installed equipment

Helicopters embodying modification 350A070791 (installation of the FUELTRON flowmeter) and not embodying modification 355A085801.



### NOTE

Modification 350A070791 (installation of the FUELTRON

flowmeter on each of the fuel systems) was embodied on new helicopters or through Service Bulletin 28.00.02.

1.A.2. Non-installed equipment

FUELTRON flowmeter P/N 704A37-670-001.



### 1.B. ASSOCIATED REQUIREMENTS

Not applicable.



### 1.C. REASON

After landing an AS355 helicopter, the pilot remark ed the uncontrolled flame-out of engine 1. The analysis carried out concerning this event has shown that particle cont amination obstructed the FUELTRON flowmeter, which provoked t he uncontrolled flame-out of engine 1.

This obstruction which led to engine flame-out is d ue to the cross-section of the passage area of the flowmeter being smaller than the meshes in the upstream fuel pump strainer. For this reason, the particles can pass through the strainer and then get blocked inside the FUELTRON flowmeter.

The FUELTRON flowmeter installation is identical on the two engines. The simultaneous obstruction of both flowmeters can lead to the flame-out of both engines in flight.

Consequently, pending a modification to this installation, EUROCOPTER makes it mandatory to remove and

disable the FUELTRON flowmeter installation.



### ATTENTION

EUROCOPTER REMINDS O PERATORS THAT THIS

CONTAMINATION CAN BE GENERATED WHEN REFUELING AND THAT THE PRÉCAUTIONS TO BE

TAKEN ARE GIVEN IN INFORMATION NOTICE

NO. 2145-I-28 AND WORK CARD 20.07.02.208.

# ASB No. AS355-28.00.20

Revision 0 2013-06-06 Page 3/12

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

### 1.D. DESCRIPTION

This ALERT SERVICE BULLETIN comprises: - Removal of the flowmeter and modification of the fuel system. - Disabling of the electrical syst em and the flowmeter installation.



### 1.E. COMPLIANCE

1.E.1. Compliance at the works

Helicopters/installed equipment:

Not applicable.

Non-installed equipment:

Not applicable.

1.E.2. Compliance in service

Helicopters/installed equipment:

Comply with paragraph 3. of this ALERT SERVICE BULLETIN within 750 flying hours or within 6 months whichever occurs first from receip t of this ALERT SERVICE BULLETIN, issued on the date indicated at the foot of the page.

Non-installed equipment:

Upon receipt of this ALERT SERVICE BULLETIN and pen ding a modification to the installation, FUELTRON flowmeters P/N 704A37-670-001 are prohibited from being installed on AS355 helicopters.



### 1.F. APPROVAL

Approval of modifications:

The information or instructions relate to modification 355A085801 which were approved on May 28, 2013 under the EASA Design Or ganization Approval No. 21J.056 fo r helicopters of civil versions subject to an Airworthiness Certificate.

The information or instructions relate to modification 355A085801 which were approved on May 28, 2013 under the prerogatives of the recognit ion of design capability FRA21J-002-DGA for French Government helicopters.

Approval of this document:

The technical information contained in this AL ERT SERVICE BULLETIN Revision 0 was approved on June 06, 2013 under the authority of EASA Design Organization A pproval No. 21J.056 for helicopters of civil versions subject to an Airworthiness Certificate.

The technical information contained in this AL ERT SERVICE BULLETIN Revision 0 was approved on June 06, 2013 under the prerogatives of the recogn ition of design capability FRA21J-002-DGA for French Government helicopters.

# ASB No. AS355-28.00.20

Revision 0 2013-06-06 Page 4/12

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

### 1.G. MANPOWER

Qualification: For compliance with this ALERT SERVICE BULLETIN: 1 Mechanical Engineering Technician.

1 Avionics Technician.

Time for the operations:

4 hours.

Estimated helicopter grounding time:

4 hours.



### 1.H. WEIGHT AND BALANCE

Not applicable.



### 1.I. EFFECT ON ELECTRICAL LOADS

Negligible.



### 1.J. SOFTWARE MODIFICATION EMBODIMENT RECORD

Not applicable.



### 1.K. REFERENCES

The following documents are required for compliance with this ALERT SERVICE BULLETIN:

Maintenance Manual (MET):

24.00.00.301 General instructions

28.00.00.301 General instructions

28.41.10.401 Flowmeter installation: Installation - Removal

Standard Practices Manual (MTC): 20.02.01.103 Installation of pipes 20.02.06.402 Safetying with lockwire 20.07.02.208 Refueling an aircraft from a barrel or any other container 20-09-01-902 Storage and service life limit s - Pipes - Hoses and flexible pipes



### 1.L. DOCUMENTS AFFECTED

Not applicable.



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

Not applicable.

# ASB No. AS355-28.00.20

Revision 0 2013-06-06 Page 5/12

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

### 2. MATERIAL INFORMATION

2.A. MATERIAL: PRICE - AVAILABILITY - PROCUREMENT

For any information concerning the price of kits and/or components, contact the EUROCOPTER Network Sales & Customer Relations Department.

EUROCOPTER Etablissement de Marignane Direction Ventes et Relations Client (ECR)

13725 MARIGNANE CEDEX

FRANCE



### NOTE 1

On the purchase order, please specify the mode of transport, the destination, and the numbers of the aircraft to be modified.



### NOTE 2

For ALERT SERVICE BULLETINS, order by:

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



### 2.B. INFORMATION CONCERNING INDUSTRIAL SUPPORT

Not applicable.



### 2.C. MATERIAL REQUIRED FOR EACH HELICOPTER/COMPONENT

Kits or components to be ordered for one helicopter or one assembly:

Kit P/N 355A08-5801-0071 Removal of the FUELTRON flowmeter comprising:

Key Word Qty New P/N Item Former

P/N → Instruction

Hose 1 704A34-416-029 1

Hose 1 704A34-416-030 2

Blank 1 355A08-4587-20 3 Cap 22 E0737R1332 4

Screw 4 A0164TK040S010X 5 Snap nut 4 NU504 6

Material to be ordered separately:

Key Word Qty New P/N Item Former

P/N → Instruction

Lockwire A/R EN3628-0,8 20 Snap wire A/R 21



### 2.D. MATERIAL TO BE RETURNED

Not applicable.

# ASB No. AS355-28.00.20

Revision 0 2013-06-06 Page 6/12

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

### 3. ACCOMPLISHMENT INSTRUCTIONS

3.A. GENERAL

Comply with the General Instructions as per MET Work Cards 24.00.00.301 and 28.00.00.301.



### NOTE 1

The procedure is identical for the LH and RH sides of the helicopter. Only the procedure for the LH side is given.



### 3.B. OPERATIONAL PROCEDURE

3.B.1. Preliminary steps

- Open the engine cowlings.

- Close the fuel shut-off valves. - Remove the lower cowlings. - Open the LH and RH MGB cowlings. - Remove the rear instrument panel cowling. - Remove the instrument panel covering.

3.B.2. Procedure



### WARNING

DURING INTERVENTIONS ON THE FUEL SYSTEM,

TAKE EVERY CARE NECESSARY TO PREVENT

CONTACT WITH THE FUEL.

3.B.2.a. Removal of the flowmeter and modification of the fuel system

Figure 1 - DETAIL A - Remove and store the FUELTRON flowmeter (a) as per MET Work Card 28.41.10.401. - Remove the union nut (b) from the union (c).

Figure 1 - DETAIL B - Mark the routing of the hose (d). - Cut and remove the lockwires (e). - Disconnect the hose (d). - Remove and store the hose (d) as per MTC Work Card 20-09-01-902.

Figure 2 - DETAILS C and D - Connect the LH hose (1) in the previously marked position as per MTC Work Card 20.02.01.103. - Lock the hose assembly (1) and unions using lock wire (20) as per MTC Work Card 20.02.06.402.



### NOTE 2

Connect and lock the hose (2) for the RH side.

# ASB No. AS355-28.00.20

Revision 0 2013-06-06 Page 7/12

This document is available on the internet: www.eurocopter.com/techpub 3.B.2.b. Disabling the electrical system and disabling the installation



### NOTE 3

There are two possibilities for th e position of the flowmeter indicator. It may be installed on the console (paragraph 3.B.2.b.2.) or on the instrument panel (paragraph 3.B.2.b.3.).

3.B.2.b.1. Disabling the flowme ter wiring (Figures 3, 4 and 5)

- Remove and store the flowmeter indicator (j) (Figur e 3: console) and (k) (Figure 4: instrument panel). - Disconnect then blank all the wires using the caps (4) as indicated in Figure 5 (battery, LH overhead panel and fuel system, indicators). - Store or coil the wires to prevent any interference. - Remove and store the 2.5A fuse (f) (Figure 5 - Detail G).

3.B.2.b.2. Disabling the flowmeter in stallation on the console (Figure 3)

- Mark and drill 4 holes (r) with a diameter of 6mm on the console covering (m) and according to the dimensions indicated in Figure 3 - DETAIL E. Us e the existing diameter (q) of 75mm on the console covering in order to corr ectly position the drilling. - Deburr and round off sharp edges. - Position the four snap nuts (6). - Position the blank (3) and attach it using the 4 screws (5) as per Figure 3 - Cross-Section A-A.

3.B.2.b.3. Disabling the flowmeter insta llation on the instrument panel (Figure 4)

- Mark and drill 4 holes (t) with a diameter of 6mm on the instrument panel covering (u) and according to the dimensions indicated in Figure 4 - DETAIL F. Use the existing diameter (s) of 75mm on the instrument panel coveri ng in order to correctl y position the drilling. - Deburr and round off sharp edges. - Position the four snap nuts (6). - Position the blank (3) and attach it using the 4 screws (5) as per Figure 4 - Cross-Section B-B.

3.B.3. Final steps

- Install the instrument panel covering. - Install the rear instrument panel cowling. - Close the LH and RH MGB cowlings. - Install the lower cowlings. - Open the fuel shut-off valves and safety with sn ap wire (21) as per Work Card 20.02.06.402. - Close the engine cowlings.



### 3.C. IDENTIFICATION

Identification of this document:

Record compliance with this document, with the revision number, in the helicopter documents.



### 3.D. OPERATING AND MAINTENANCE INSTRUCTIONS

Not applicable.

# ASB No. AS355-28.00.20

Revision 0 2013-06-06 Page 8/12

This document is available on the internet: www.eurocopter.com/techpub Figure 1 

## DETAIL A

a b c

Cloison pare-feu

Firewall



## d e DETAIL B B



## d PRE MOD 355A085801

# ASB No. AS355-28.00.20

Revision 0 2013-06-06 Page 9/12

This document is available on the internet: www.eurocopter.com/techpub Figure 2 

## 2

1

1

2 20

DETAIL C

DETAIL D C D

20 1

2 POST MOD 355A085801

# ASB No. AS355-28.00.20

Revision 0 2013-06-06 Page 10/12

This document is available on the internet: www.eurocopter.com/techpub Figure 3 

## FWD

FWD

CROSS-SECTION A-A

POST MOD 355A085801 FWD

PRE MOD 355A085801 j

5 3

3 6 m

6

5

m DETAIL E

q r

# ASB No. AS355-28.00.20

Revision 0 2013-06-06 Page 11/12

This document is available on the internet: www.eurocopter.com/techpub Figure 4 

## CROSS-SECTION B-B

POST MOD 355A085801 PRE MOD 355A085801 k

5 3

3 6

6

5 u

s

u DETAIL F

t

# ASB No. AS355-28.00.20

Revision 0 2013-06-06 Page 12/12

This document is available on the internet: www.eurocopter.com/techpub Figure 5 

## 4 4 4

4 POST MOD

355A085801 PRE MOD

355A085801

4 f

DETAIL G