EUROCOPTER CIVIL VERSIONS: N1, N2, N3 DIRECTION TECHNIQUE SUPPORT

13725 MARIGNANE CEDEX FRANCE MILITARY VERSIONS: F, Fi, K

ALERT SERVICE BULLETIN

No. 34.00.31

SUBJECT: NAVIGATION

Reinforced shelf for GV76-1 vertical gyro units in cargo

Corresponds to MOD 365P081895

REVISION No. DATE OF APPROVAL DATE OF ISSUE

2010.05.25

2010.07.28

On: May 25, 2010

On: July 28, 2010

Revision 0

Revision 1

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This document is available on the Internet: www.eurocopter.com/techpub 2010.07.28

ALERT SERVICE BULLETIN AS365
1. PLANNING INFORMATION

CAUTION

THE INFORMATION AND INSTRUCTIONS IN THIS

SERVICE BULLETIN ARE INTENDED FOR

MAINTENANCE TEAMS.

1.A. EFFECTIVITY

1.A.1. Helicopters/installed equipment

Helicopters delivered before 2010.05.01 equipped with the GV76-1 vertical gyro unit installation on LH or RH

shelf in rear cargo and pre MOD 365P081895.

NOTE 1

Refer to the aircraft Certificate of Conformity (or RIC AMSIndividual Inspection Log Book) , the Equipment Log Cards

(FME) or the aircraft Log Book to identify the actual

modification status of the aircraft.

NOTE 2

Helicopters AS365N3 S/N 6698, 6701, 6723, 6737 and

6741 are not concerned by this Alert Service Bulletin.

1.A.2. Non-installed equipment

Not applicable.

1.B. ASSOCIATED REQUIREMENTS

Not applicable.

1.C. REASON

The purpose of Revision 0 of this Service Bulletin was to reinforce shelves ot the vertical gyros GV76-1 (in cargo

compartment), on the RH or LH side.

Compliance with Revision 0 of this Alert Service Bulletin invalidated the instructions of Emergency Alert Service

Bulletin No. 01.00.61 as well as of EASA Airworthiness Directive No. 2008-0195-E.

The purpose of Revision 1 is to:

- make this Alert Service Bulletin not applicable to helicopters AS365N3 S/N 6698, 6701, 6723, 6737 and 6741.

These helicopters are fitted with different cargo compartment shelves (narrower shelves) whose configuration

does not jeopardize aircraft safety,

- recommend the measures defined in this Alert Service Bulletin for helicopters equipped with electromechanical

horizons. Helicopters equipped with electromechanical horizons (and not display screens) are no longer subject

to the provisions of Emergency Alert Service Bulletin No. 01.00.61.

Revision 1 of this Alert Service Bulletin does not supersede compliance with Revision 0.

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ALERT SERVICE BULLETIN AS365
This Alert Service Bulletin will be subject of an EASA Airworthiness Directive except for paragraph 1.E.2.a.2.

1.D. DESCRIPTION

In flight, and on several aircraft equipped with the GV76-1 vertical gyro unit installation (in cargo), the crew noted

a drift in roll of both the Pilot's and the Copilot's horizons on the flight displays. This "slow" drift may be

simultaneous (on both horizons) or not and in the same or in different directions.

The phenomenon was reported to Eurocopter and tests were performed.

Further to these tests, Eurocopter found that these drifts were caused by a fault in the vertical gyro unit installation

in rear cargo.

In fact, in certain configurations the GV76-1 vertical gyro unit installation has a natural mode close to the main

rotor's harmonic frequency which generates rather significant vibratory levels on the GV76-1 unit by amplifying

the intrinsic vibrations of the aircraft. The faults were caused by these vibratory levels.

However, the load on the upper shelf has no effect on this mode.The critical mode is essentially due to bending

of the horizontal cross-members which support the GV76-1 shelf.

Therefore, Eurocopter designed a solution which consists of adding two attachment points (one to the front, one

to the rear) between the cargo floor and the horizontal cross-members of the shelf which supports the GV76-1

units.

1.E. COMPLIANCE

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 service

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

1.E.2.a.1. Helicopter not equipped with electromechanical horizons

EUROCOPTER renders compliance with this Alert Service Bulletin mandatory for helicopters not equipped

with electromechanical horizons.

Comply with Paragraphs 2.A. and 2.B. of this Alert Service Bulletin, within 110 flying hours as from receipt

of this Alert Service Bulletin circulated at date mentioned in page footer, and by December 31, 2010 at the

latest.

1.E.2.a.2. Helicopter equipped with electromechanical horizons

EUROCOPTER recommends the measures defined in this Alert Service Bulletin for helicopters equipped

with Electromechanical horizons.

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ALERT SERVICE BULLETIN AS365
Comply with Paragraphs 2.A. and 2.B. of this Alert Service Bulletin, during the next scheduled maintenance

which follows receipt of this Alert Service Bulletin circulated at the date mentioned on page footer, within

a maximum deadline of 12 months.

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

Not applicable.

1.F. APPROVAL

1.F.1. Approval of modifications

The information or instructions relate to Modification 365P081895 which were approved on March 16, 2010 by

EASA for helicopters of civil versions subject to an Airworthiness Certificate.

1.F.2. Approval of the Service Bulletin

The technical information contained in this Alert Service Bulletin Revision 0 was approved on May 25, 2010

under the authority of EASA Design Organization Approval No. 21J.056 for helicopters of civil versions subject

to an Airworthiness Certificate.

The technical information contained in this Alert Service Bulletin Revision 0 was approved on May 25, 2010 by

EUROCOPTER's Airworthiness Department for helicopters of military versions.

The technical information contained in this Alert Service Bulletin Revision 1 was approved on July 28, 2010

under the authority of EASA Design Organization Approval No. 21J.056 for helicopters of civil versions subject

to an Airworthiness Certificate.

The technical information contained in this Alert Service Bulletin Revision 1 was approved on July 28, 2010 by

EUROCOPTER's Airworthiness Department for helicopters of military versions.

1.G. MANPOWER

1.G.1. Qualification

For compliance with this Alert Service Bulletin Eurocopter recommends the following personnel qualifications:

Qualification:

- 1 Avionics Technician,

- 1 Airframe Technician.

1.G.2. Time for the operations

Time for the operations is indicated for reference, for a standard configuration.

Time for the operations:

- 14 hours approximately for Avionics Technician,

- 2 hours approximately for Airframe Technician.

1.G.3. Estimated helicopter grounding time

3 days approximately.

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ALERT SERVICE BULLETIN AS365
NOTE 3

Cure time for sealing compound No. 17 (20) + (21) is 8

hours at room temperature > 18°C and 1 hour at 65°C ±

5°C or 7 days at room temperature > 18°C.

1.H. WEIGHT AND BALANCE

1.H.1. Weight

Weight: + 0.085 kg.

1.H.2. Moment

Longitudinal moment (along X): + 0.528 m.kg.

Lateral moment (along Y) (RH shelf): + 0.003 m.kg.

Lateral moment (along Y) (LH shelf): - 0.003 m.kg.

Vertical moment (along Z): - 0.207 m.kg.

1.I. EFFECT ON ELECTRICAL LOADS

Not applicable.

1.J. SOFTWARE MODIFICATION EMBODIMENT RECORD

Not applicable.

1.K. REFERENCES

MET : 24.00.00.300 : Electrical power generation - Instructions,

MET : 34.00.00.300 : Navigation - General instructions,

MET : 34.22.03.401 : GV76 vertical gyro units - Removal - Installation,

MET : 34.22.03.501 : GV76 vertical gyro units - Operating tests,

MET : 53.20.00.404 : Secondary structure - Access doors on frame X6630: Removal - Installation,

MTC : 20.02.01.411 : Installation of electrical and radio-electrical cables - Binding procedure,

MTC : 20.02.01.415 : Installation of electrical and radio-electrical cables - Installation of electrical cable bundles,

MTC : 20.02.01.418 : Protection of electrical wiring during system maintenance, repair or modification operations,

MTC : 20.02.04.601 : Riveting - General riveting acceptance requirements,

MTC : 20.02.05.401 : Joining - Joining by riveting,

MTC : 20.02.05.404 : Joining - Assembling by bolts and nuts,

MTC : 20.02.07.101 : Electrical bonding - General,

MTC : 20.02.07.401 : Bonding methods,

MTC : 20.03.02.406 : General rivet replacement principles - CHERRY-MAX rivets A-S-N-A 0077 and 0078,

MTC : 20.04.03.102 : Surface preventive treatment against corrosion – Definition of types of corrosion,

MTC : 20.06.01.411 : Bonding with adhesives – HYSOL EA 9396,

MTC : 20.06.04.101 : Bonding with resin mixes - General properties of resin mixes,

MTC : 20.06.04.305 : Bonding with resin mixes - Sealing mixes No. 16 and 17,

MTC : 20.07.02.201 : Safety instructions - Aircraft parked inside a hangar,

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ALERT SERVICE BULLETIN AS365
Instructions applicable when working on an aircraft electrical circuit or when energizing

aircraft power generating systems on ground,

MTC : 20.07.03.406 :

General principles applicable for visual cleanliness, appearance checks on an aircraft after

an inspection or repair,

MTC : 20.07.02.408 :

General rules applicable to aircraft - Raising and updating the equipment log card (F.M.)

for equipment follow-up,

MTC : 20.08.05.101 :

General rules applicable to aircraft - Monitoring of parts in operation, marking and service

life customization.

MTC : 20.08.05.103 :

1.L. OTHER DOCUMENTS AFFECTED

1.L.1. Documents already updated

Not applicable.

1.L.2. Documents to be updated

The modification will be integrated by Eurocopter in the following document: IPC.

This document will be circulated at a later date.

1.M. TOOLING AFFECTED

Not applicable.

1.N. INTERCHANGEABILITY OR MIXABILITY OF PARTS

1.N.1. Interchangeability

Not applicable.

1.N.2. Mixability

Not applicable.

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ALERT SERVICE BULLETIN AS365
2. ACCOMPLISHMENT INSTRUCTIONS

2.A. GENERAL

- Comply with general electrical instructions as per Work Cards 24.00.00.300 (MET) and 20.07.03.406 (MTC).

- Comply with general instructions on navigation system as per Work Card 34.00.00.300 (MET).

- Install electrical wiring as per Work Card 20.02.01.415 (MTC).

- Bind electrical wiring as per Work Card 20.02.01.411 (MTC).

- Comply with instructions for electrical earthing of aircraft as per Work Card 20.07.02.201 (MTC).

- Assemble and apply standard tightening torques on bolts and nuts as per Work Card 20.02.05.404 (MTC).

- Ensure electrical bonding as per Work Cards 20.02.07.101 (MTC) and 20.02.07.401 (MTC).

- During modification, protect electrical wiring as per Work Card 20.02.01.418 (MTC).

- Assemble by riveting as per Work Cards 20.02.04.601 and 20.02.05.401 (MTC).

- Use adhesive paste (10) as per Work Card 20.06.01.411 (MTC).

- Protect surfaces against corrosion of surfaces as per Work Card 20.04.03.102 (MTC).

2.B. OPERATIONAL PROCEDURE

2.B.1. Preliminary steps

- Disconnect all electrical power supplies as well as battery.

- Install access means.

- Remove all panels, padding and equipment as required for access to work zones.

2.B.2. Procedure

NOTE 1

Only procedure for modification of RH cargo shelf is

described. Procedure for LH shelf attachment is

symmetrical.

2.B.2.a. Preliminary marking of reinforcement attachment insert positions

As per Figures 2 and 3

- Finish drilling to diameter 5.5 the 2 holes located on the base of front reinforcement (3).

- Position front (3) and rear (4) reinforcements respectively against spars (ab) and (aa) and on cargo floor (to

match dimensions in Figures 2 and 3), and holding with pliers.

- However, in case of poor accessibility for positioning rear reinforcement (4), remove access doors on frame

X6630 as per Work Card 53.20.00.404 (MET).

- Center-mark location of holes (P) on floor for inserts (2).

- On both spars (ab) and (aa) center-mark holes (A1) and (B1) to be drilled for rivets (5).

- Remove reinforcements (3) and (4).

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ALERT SERVICE BULLETIN AS365
2.B.2.b. Removing cargo shelf and equipment (Figure 1)

CAUTION

CARGO SHELF MODIFICATION REQUIRES REMOVAL.

OPERATION REQUIRES THE UTMOST CARE NOT TO

DAMAGE HARDWARE EQUIPMENT ON SHELVES OR

ELECTRICAL WIRING ROUTED ON SHELF. PAY

SPECIAL ATTENTION TO ELECTRICAL WIRING

ROUTES AND TO POSITIONS OF VARIOUS HARDWARE

EQUIPMENT (STRICTLY IDENTICAL POSITIONING

AFTER MODIFICATION IS MANDATORY).

2.B.2.b.1. Removing hardware equipment

- If not done in Paragraph 2.B.2.a., and in order to make equipment removal easier, remove access doors

on frame X6630 as required as per Work Card 53.20.00.404 (MET).

CAUTION

DURING REMOVAL HANDLE ELECTRICAL WIRING

WITH CARE TO AVOID ANY DAMAGE.

- Remove GV76-1 vertical gyro units as per Work Card 34.22.03.401 (MET).

NOTE 2

During removal of vertical gyro units GV76-1, adjustable

shims may be found between vertical gyro unit base and

shelf plate; in this case note position of each shim in order

to reposition accordingly when reinstalling these vertical

gyro units on shelf plate.

- Removing other hardware equipment from cargo shelves:

. note equipment positions on shelves,

. at hardware equipment items on shelves (transceivers, units,...):

.. disconnect removable connectors and protect,

.. remove equipment items and retain Nuts & Bolts,

.. do not systematically disassemble:

- fixed connectors at hardware items seats (racks),

- equipment seats (racks).

2.B.2.b.2. Removing equipment seats (racks) and de-routing electrical wiring

- Note electrical wiring routes on cargo bay.

- Remove clamps which secure electrical wiring on cargo bay.

- As required, remove equipment seats (racks) and retain Nuts & Bolts.

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ALERT SERVICE BULLETIN AS365
NOTE 3

Removing connectors and electrical wiring from seats

(racks) is not systematically necessary during removal of

electrical cargo bay; proceed with extreme care to avoid

any damage thereof (twisted wiring, stripped electrical wires,

de-swaged contacts,...).

- On cargo bay, de-route electrical wiring with care.

2.B.2.b.3. Removing cargo shelf (Figure 1)

As per Figure1 and once all equipment and electrical wiring have been removed and/or safetied:

- remove bolts (f), (g) and washers (e), and retain,

- remove cargo shelf (h).

2.B.2.c. Modifying cargo floor (Figure 2)

As per Figure2

- Marking of 4 holes (P) was done (Paragraph 2.B.2.a.) on floor (m):

drill 4 holes (P) in first honeycomb skin (upper surface of floor) to diameter 14.3 mm ± 0.1, to match front

(3) and rear (4) reinforcements,

.

. open out honeycomb to a diameter of 20 mm at holes (P) (see Section L-L),

. fit inserts (2) and inject sealing compound (No. 17) comprised of adhesive paste (1) and micro-balloon

powder (6) as per Work Cards 20.06.04.101 and 20.06.04.305 (MTC):

.. injection of sealing compound (1) + (6) is performed by means of mounting cups (q),

.. inject sealing compound (1) + (6) at hole (R),

.. after complete drying, remove cups (q).

2.B.2.d. Installing cargo shelf and front and rear reinforcements (Figure 1, Figure 3)

As per Figures 1 and 3

- Drill 5 holes (B1) to diameter 3.3 mm on rear spar (aa) of shelf (h) to match rear reinforcement (4) and while

checking bay positioning (h) (spar (aa)) / rear reinforcement (4) / cargo floor (m). Deburr and protect against

corrosion.

- Ensure electrical bonding of every other hole (B1) and install rear reinforcement (4) on spar (aa) of bay (h)

by means of 5 rivets (5) as per Work Card 20.03.02.406 (MTC).

- Install cargo shelf (h) on cargo floor (m) by means of bolts (f), (g) and washers (e) previously recovered

(Paragraph 2.B.2.b.3.).

- Install 2 bolts (7) and 2 washers (8) on rear reinforcement (4) for security on cargo floor (m).

- Drill 5 holes (A1) to diameter 3.3 mm on front spar (ab) of shelf (h) to match front reinforcement (3) and

while checking bay positioning (h) (spar (ab)) / front reinforcement (3) / cargo floor (m). Deburr and protect

against corrosion.

- Ensure electrical bonding of every other hole (A1) and install front reinforcement (3) on spar (ab) of shelf

(h) by means of 5 rivets (5) as per Work Card 20.03.02.406 (MTC).

- Fit 2 bolts (7) and 2 washers (8) on front reinforcement (3) for security on cargo floor (m).

2.B.2.e. Installing electrical wiring and equipment on cargo shelf

- Re-install items as were installed before removal (Paragraphs 2.B.2.b.1.and 2.B.2.b.2.):

. seats (racks) equipped with electrical wiring by means of previously recovered Nuts & Bolts,

. electrical wiring (which was routed on bay),

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ALERT SERVICE BULLETIN AS365
. hardware equipment (transceivers, units,...):

.. secure on seats (racks) or on respective shelves by means of previously recovered Nuts & Bolts,

.. connect removable connectors,

- Install GV76-1 vertical gyro units as per Work Card 34.22.03.401 (MET).

NOTE 4

If adjustable shims were found between vertical gyro unit

base and shelf plate at the time of removal of vertical gyro

units (Paragraph 2.B.2.b.1.), it is mandatory to reposition

these adjustable shims identically.

- Bind installed electrical wiring by means of Clamp, bindings (9), (10), (11) or (12), as required.

- If removed in Paragraph 2.B.2.b.1., re-install access doors on frame X6630 as per Work Card

53.20.00.404 (MET).

2.B.3. Tests

- Reconnect electrical power supplies (disconnected during preliminary steps - Paragraph 2.B.1.).

- Carry out operating tests of GV76-1 vertical gyro units as per Work Card 34.22.03.501 (MET).

NOTE 5

During installation of GV76-1 vertical gyro units (Paragraph

2.B.2.e.), Paragraph 5 of Work Card 34.22.03.401 (MET)

includes vertical gyro unit tests. Do not repeat tests if

previously performed.

- Carry out functional tests of all installations affected by cargo shelf removal in order to check correct function

of all systems.

2.B.4. Final steps

- Check visual aspect and cleanliness as per Work Card 20.07.02.408 (MTC).

- Install padding, panels and equipment which were removed during preliminary steps (Paragraph 2.B.1.).

- Remove the access means installed during preliminary steps (Paragraph 2.B.1.).

- Set helicopter into flight condition.

2.B.5. Ground run/flight test

Not applicable.

2.C. OPERATIONAL PROCEDURE ON NON-INSTALLED EQUIPMENT

2.C.1. Stock retrofitting

Not applicable.

2.C.2. Stock replacement, stock scrapping and stock building-up

Not applicable.

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2.D. IDENTIFICATION

2.D.1. Identification of modifications in the documentation

Record embodiment of Modification 365P081895 and compliance with this Alert Service Bulletin with its Revision

number in the aircraft documents.

2.D.2. Identification of modifications on equipment

Not applicable.

2.D.3. Identification of the new version

Not applicable.

2.E. OPERATING AND MAINTENANCE INSTRUCTIONS

2.E.1. Operating instructions

Not applicable.

2.E.2. Scheduled maintenance instructions

Not applicable.

2.E.3. Unscheduled maintenance instructions

Not applicable.

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Figure 1

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3. MATERIAL INFORMATION

3.A. MATERIAL: PRICE AND AVAILABILITY

3.A.1. Cost

3.A.1.a. Components

The kits and/or components will be delivered free of charge by Eurocopter until December 31, 2010.

For any information concerning cost of Technical assistance consult the Eurocopter network's Support Sales

Department.

3.A.1.b. Tools

Not applicable.

3.A.2. Availability

3.A.2.a. Components

The kits or components will be delivered upon Operator's order.

3.A.2.b. Tools

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

The kit mentioned in table below allows modification of cargo shelf on RH or LH side.

Material P/N Qty Item Key Word Former P/N Instructions

365P08-1895-0071 1 GV76-1 Rack (elec.) modification kit including:

DHS443-152.22 4 (2) Insert

365P08-1895-20 1 (3) Reinforcement, front

365P08-1895-21 1 (4) Reinforcement, rear

Rivet

(CHERRY-MAX)

ASNA0078A402 12 (5)

22208BC050012L 4 (7) Bolt

23111AG050LE 4 (8) Washer

Clamp, binding (Ø 1.6

to 75 mm)

E0043-7C0 50 (9)

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Material P/N Qty Item Key Word Former P/N Instructions

Clamp, binding (Ø 1.6

to 45 mm)

E0043-1C0 50 (10)

Clamp, binding (Ø 4.8

to 100 mm)

E0043-3C0 50 (11)

Clamp, binding (Ø 1.6

to 30 mm)

E0043-5C0 30 (12)

3.C.2. Material to be ordered separately

Not applicable.

3.C.3. Material to be modified at the Manufacturer's or to be returned

Not applicable.

3.C.4. Products to be ordered separately

As per Work Cards mentioned in this Alert Service Bulletin and list below:

The ingredients can be ordered separately, from the INTERTURBINE AVIATION LOGISTICS,

Website: http://www.interturbine.com

Telephone: +49.41.91.809.300

AOG: +49.41.91.809.444

Material P/N Qty Item Key Word

Adhesive paste, 1 liter can

(HYSOL EA 9396)

ECS0010.10 1 Liter (1)

BJ0-0930 A/R (6) Micro-balloon powder

3.C.5. Tools

As per Work Cards mentioned in this Alert Service Bulletin.

3.C.6. Material supplied by the User

Not applicable.

3.C.7. Material required for non-installed components

As required, place orders for material listed in Paragraph 3.C.1.

3.D. PROCUREMENT CONDITIONS

Order the required quantity from the EUROCOPTER network's Customer Support Sales Department,

or from

Eurocopter

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Etablissement de Marignane

Direction VENTES Service Client (C.R.)

13725 MARIGNANE CEDEX

FRANCE

NOTE 1

On the purchase order, please specify the mode of

transport, the destination and the serial 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.

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4. APPENDIX

Not applicable.

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4. APPENDIX

Not applicable.

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