ASB No. AS350 62.00.34

Revision 0 2014-04-28 Page 1/13

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Civil version(s): B, BA, BB, B1, B2, B3, D

Military version(s): L1

ALERT SERVICE BULLETIN

SUBJECT: MAIN ROTOR - Swashplates

Check of the rotating star

Revision No. Date of issue

Revision 0 2014-04-28

Summary:

Replace the rotating stars of the swashplate assemblies which comply with Repair Sheet (FR) 350A371003AA. 

Compliance:

Airbus Helicopters renders compliance with this ALERT SERVICE BULLETIN mandatory.

For the attention of
ASB No. AS350 62.00.34

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1. PLANNING INFORMATION

1.A. EFFECTIVITY

1.A.1. Helicopters/installed equipment

On helicopters equipped with a swashplate assembly comprising a rotating star with Part Number 

(MP/N) 350A371003-04, -05, -06, -07 or -08.

NOTE 1

Refer to the Log Card (FM) of the Rotor Mast to identify the 

actual configuration of the helicopter.

1.A.2. Non-installed equipment

- Rotor mast assemblies, all Part Numbers, equipped with a swashplate assembly comprising a rotating star 

with Part Number (MP/N) 350A371003-04, -05, -06, -07 or -08.

- Swashplate assemblies, all Part Numbers, comprising a rotating star with Part Number 

(MP/N) 350A371003-04, -05, -06, -07 or -08.

- Rotating stars with Part Number (MP/N) 350A371003-04, -05, -06, -07 or -08.

1.B. ASSOCIATED REQUIREMENTS

Not applicable.

1.C. REASON

Repair Sheet (FR) 350A371003AA consists in reconditioning the rotating swashplate by machining and 

adding a steel ferrule inside the swashplate, in order to accommodate the swashplate bearing.

This repair potentially affects the Service Life Limit (SLL) specified in the Airworthiness Limitations Section 

(ALS).

Airbus Helicopters makes the check of the rotating stars for compliance with Repair Sheet 

(FR) 350A371003AA mandatory. 

1.D. DESCRIPTION

Compliance with this ALERT SERVICE BULLETIN consists in:

- Checking that the rotating star of the swashplate assembly does not comply with Repair Sheet 

(FR) 350A371003AA.

- If there is a ferrule: check that there are no cracks on the rotating star.

. Replace the rotating star on which cracks are found and/or which complies with Repair Sheet 

(FR) 350A371003AA.

- If there is no ferrule: Leave as is.
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1.E. COMPLIANCE

Airbus Helicopters renders compliance with this ALERT SERVICE BULLETIN mandatory.

1.E.1. Compliance at the works

Not applicable.

1.E.2. Compliance in service

Helicopters/installed equipment:

- Comply with paragraph 3. of this ALERT SERVICE BULLETIN, except for paragraph 3.B.7., at the latest 

by December 31, 2014, without exceeding 165 flying hours following receipt of this ALERT SERVICE 

BULLETIN, issued on the date indicated at the bottom of the page.

a) Interpretation of the results:

- If there is no ferrule: Leave as is and comply with paragraph 3.B.5.

- If the ferrule is present:

. Contact the Sales and Customer Relations Department and indicate the Part Number (MP/N) and 

Serial Number (S/N) of the repaired rotating star:

Tel.: + 33 (0)4.42.85.84.61

Fax: + 33 (0)4.42.85.99.66

E-mail: Dyncomp.Technical-Support@eurocopter.com

. Perform a visual check as per paragraph 3.B.3. to make sure there are no cracks on the repaired 

rotating star.

b) Interpretation of the results:

- If a crack is found: 

. Replace the repaired rotating star as per paragraph 3.B.4. before resuming flights.

- If there is no crack:

. Replace the repaired rotating star as per paragraph 3.B.4. at the latest by December 31, 2014.

. Pending the replacement of the repaired rotating star: Comply with paragraph 3.B.3. at least every 165 

flying hours.

Non-installed equipment:

- Comply with paragraph 3.B.7.a. of this ALERT SERVICE BULLETIN before installation on a helicopter or at 

the latest by December 31, 2014.

c) Interpretation of the results:

- If there is no ferrule: Leave as is.

- If the ferrule is present:

. Contact the Sales and Customer Relations Department and indicate the Part Number (MP/N) and 

Serial Number (S/N) of the repaired rotating star:

Tel.: + 33 (0)4.42.85.84.61

Fax: + 33 (0)4.42.85.99.66

E-mail: Dyncomp.Technical-Support@eurocopter.com

 . Replace the repaired rotating star as per paragraph 3.B.7.b.
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1.F. APPROVAL

Approval of modifications:

Not applicable.

Approval of this document:

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

on April 28, 2014 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 April 28, 2014 by the Airbus Helicopters Airworthiness Department for export military versions.

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

on April 28, 2014 under the prerogatives of the recognition of design capability FRA21J-002-DGA for French 

Government helicopters.

1.G. MANPOWER

For compliance with this ALERT SERVICE BULLETIN, Airbus Helicopters recommends the following 

personnel qualifications:

Qualification: 2 Mechanical Engineering Technicians

The time for the operations is given for information purposes, for a standard configuration.

Time for the operations: approximately 15 minutes for 1 Mechanical Engineering Technician to check 

whether the ferrule is installed or not.

Approximately 1 hour for 1 Mechanical Engineering Technician to check that there 

are no cracks.

8 hours for 2 Mechanical Engineering Technicians to replace the repaired rotating 

star.

The estimated helicopter downtime is 1 day to replace the repaired rotating star.

1.H. WEIGHT AND BALANCE

Not applicable.

1.I. EFFECT ON ELECTRICAL LOADS

Not applicable.

1.J. SOFTWARE MODIFICATION EMBODIMENT RECORD

Not applicable.
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1.K. REFERENCES

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

- Helicopters, all versions:

. MTC: 20.02.09.101 - Crack detection through dye-penetrant inspection: General

. MTC: 20.05.01.222 - Application of PR 1771 B2 sealant

- AS350 B2 and B3 helicopters:

. AMM: 60-00-00, 3-1 - General Safety Instructions - Mechanical Assemblies

. AMM: 62-31-00, 4-1 - Removal / Installation - Main Rotor Mast

. AMM: 62-31-00, 4-2 - Disassembly - Main Rotor Mast

. AMM: 62-32-00, 4-1 - Disassembly - Swashplate Assembly

. AMM: 62-32-00, 4-2 - Assembly - Swashplate Assembly

- AS350 B, BA, BB, B1, D and L1 helicopters:

. MET: 60.00.00.301 - Rotors - General instructions

. MET: 62.30.00.401 - Rotor mast assembly - Removal/Installation

. MET: 62.30.16.401 - Rotor mast assembly (POST MOD 076120): Removal - installation

. MRM: 62.30.00.702 - Replacing swashplate bearings or cups

1.L. DOCUMENTS AFFECTED

Not applicable.

1.M. INTERCHANGEABILITY OR MIXABILITY OF PARTS

Not applicable.
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2. MATERIAL INFORMATION

2.A. MATERIAL: PRICE - AVAILABILITY - PROCUREMENT

Price

For any information concerning the kits and/or components, contact the Airbus Helicopters Network Sales 

and Customer Relations Department.

Availability

The kits and/or components will be delivered on customer's order.

Procurement conditions

Order the required quantity (unless otherwise specified)

from

Airbus Helicopters

Etablissement de Marignane

Direction Ventes et Relations Client (ECR)

13725 MARIGNANE CEDEX

NOTE 1

On the purchase order, please specify the mode of 

transport, the destination and the serial numbers of the 

helicopters 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:

Designation Qty New P/N Item Former

 P/N → Instruction

Rotating star A/R

350A37-1003-08 

or

350A37-1018-00

1 /

Discard the rotating 

stars which comply with

Repair Sheet (FR) 

350A371003AA
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Materiel to be ordered separately:

Designation Qty New P/N Item Former 

 P/N → Instruction

Washer A/R 23112CA060 2 /

Discard if 

cracks 

discovered on 

rotating star

Screw A/R 22202BC060050L 3 /

Nut A/R 22542K060 4 /

Special screw A/R 350A37-1097-20 5 /

Special screw A/R 350A37-1210-20 6 /

Screw A/R 22129BC080066L 7 /

Washer A/R 23112CA080 8 /

Washer A/R 23142AG080LE 9 /

Nut A/R ASNA0045-080BCL 10 /

Products to be ordered separately:

Refer to the Work Cards and Tasks specified in this ALERT SERVICE BULLETIN and the list below:

Designation Qty Product P/N CM Item

Sealant A/R PR 1771 B2 CM 6068 11

The products can be ordered separately from the INTERTURBINE AVIATION LOGISTICS company.

Website: http://www.interturbine.com

Telephone: +49.41.91.809.300

AOG: +49.41.91.809.444

Material required for non-installed equipment:

Order as required the material listed in paragraph 2.C. "Kits or components to be ordered for one helicopter 

or one assembly":

Specific tooling:

Designation Qty Tool P/N or equivalent Item

FACOM type flexible ultra-slim 

magnetic retriever 

(or equivalent)

1 872.2 zz

FACOM type flexible ultra-slim magnetic retriever (P/N 872.2)

2.D. MATERIAL TO BE RETURNED

Not applicable.
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3. ACCOMPLISHMENT INSTRUCTIONS

3.A. GENERAL

Read and comply with the general mechanical instructions as per MTC Work Card 60.00.00.301 or AMM 

Task 60-00-00, 3-1.

3.B. OPERATIONAL PROCEDURE

3.B.1. Preliminary steps

- Install the access equipment.

3.B.2. Checking the rotating star (a) for compliance with Repair Sheet (FR) 350A371003AA

3.B.2.a. Visual check for compliance with Repair Sheet (FR) 350A371003AA

- Visually check that the rotating star (a) of the swashplate assembly does not comply with Repair Sheet (FR) 

350A371003AA (presence of a ferrule (b)) in accordance with the photo below.

- If the ferrule is visible as per the photo below: Interpret the results as per paragraph 1.E.2.a.

- If the ferrule is not visible as per the photo below: comply with paragraph 3.B.2.b. or 3.B.2.c.

NOTE 1

The presence of the ferrule (b) on a repaired rotating star 

can be visually checked at area (X) of the compass 

attachment fitting (see photo below).

Area (X) to be 

checked

Compass 

attachment fitting

b

a
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3.B.2.b. Checking for compliance with Repair Sheet (FR) 350A371003AA using a magnetic retriever

- Using a flexible ultra-slim magnetic retriever (zz) positioned in Area (X) as close as possible to the 

compass, check whether the ferrule (b) is installed or not, in accordance with the photos below.

. If the magnetic retriever (zz) is magnetized = ferrule present.

. If the magnetic retriever (zz) is not magnetized = no ferrule.

- Interpret the results as per paragraph 1.E.2.a.

- If in doubt: comply with paragraph 3.B.2.c.

b

zz

a

Area (X)
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3.B.2.c. Visual check for compliance with Repair Sheet (FR) 350A371003AA

- Using a non-metallic spatula, remove the bead of sealant (PR) over a length of approximately 2cm 

(.78in.) and visually check whether the ferrule (b) is installed or not. 

CAUTION

THE CHECK FOR THE FERRULE IS CARRIED OUT 

WITHOUT REMOVING THE SCREWS, WASHERS 

AND NUTS ATTACHING THE DEFLECTOR (c).

NOTE 2

For information purposes, the photo above shows the ferrule 

(b) on a repaired rotating star (a) without the bead of sealant 

(PR) and without the hardware attaching the deflector (c).

- Interpret the results in accordance with paragraph 1.E.2.a.

- Apply a bead of sealant (PR) (11) (not shown) in the previously cleaned area as per MTC Work 

Card 20.05.01.222.

3.B.3. Visual check for cracks on the rotating star equipped with the ferrule

- Perform a visual check to make sure there are no cracks on the rotating star (a) in areas "Z" as 

per Figure 1.

- If in doubt: Carry out a dye-penetrant inspection as per MTC Work Card 20.02.09.101.

- Interpret the results as per paragraph 1.E.2.b.

b

a

c
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3.B.4. Replacement of the rotating star (a), (Figure 1)

- For AS350 B2 and B3 helicopters:

. Remove rotating star (a), (Figure 1) as per AMM Task 62-32-00, 4-1.

NOTE 3

In the event of cracks, when replacing the rotating star, the 

screws (not shown), washers (not shown) and nuts (not 

shown) for attaching the pitch change rods, the compass 

and the rotating star deflector must be discarded and 

replaced respectively with screws (3), (5), (6), and (7), 

washers (2), (8) and (9) and nuts (4) and (10).

. Install rotating star (1), (Figure 1) as per AMM Task 62-32-00, 4-2.

Then comply with paragraph 3.B.6.

- For AS350 B, BA, BB, B1, D and L1 helicopters:

. Remove the rotor mast assembly as per MET Work Card 62.30.00.401 or 62.30.16.401.

. Remove rotating star (a) as per MRM Work Card 62.30.00.702.

NOTE 4

In the event of cracks, when replacing the rotating star, the 

screws (not shown), washers (not shown) and nuts (not 

shown) for attaching the pitch change rods, the compass 

and the rotating star deflector must be discarded and 

replaced respectively with screws (3), (5), (6), and (7), 

washers (2), (8) and (9) and nuts (4) and (10).

. Install rotating star (1) as per MRM Work Card 62.30.00.702.

Then comply with paragraph 3.B.6.

3.B.5. Final steps

Remove the access equipment.

3.B.6. Ground run-up/flight test

Carry out a ground run-up in accordance with the Flight Manual (PMV).

3.B.7. Operational procedure on non-installed equipment

3.B.7.a. Checking the rotating star (a), (Figure 1) for compliance with Repair Sheet (FR) 350A371003AA

- Visually check that the rotating star (a), (Figure 1) of the swashplate assembly does not comply with Repair 

Sheet (FR) 350A371003AA (presence of a ferrule) in accordance with the operational procedure defined in 

paragraph 3.B.2.

- Interpret the results as per paragraph 1.E.2.c.
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3.B.7.b. Replacement of the rotating star (a), (Figure 1)

- Remove and discard rotating star (a) as per MRM Work Card 62.30.00.702 or AMM 

Task 62-32-00, 4-1.

- Install rotating star (1) as per MRM Work Card 62.30.00.702 or AMM Task 62-32-00, 4-1.

3.C. IDENTIFICATION

Identification of this document:

Record compliance with this document and its revision number on the Log Card of the Rotor mast.

Identification of modifications on the documentation:

Not applicable.

3.D. OPERATING AND MAINTENANCE INSTRUCTIONS

Not applicable.
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Figure 1

X

a

1

b

a

Z

Z

Z