40220 Tarnos - France

Tel. +33 (0)5 59 74 40 00 - Telex 570 042 - Fax +33 (0)5 59 74 45 15

MANDATORY SERVICE BULLETIN 

ALERT

TURMO IV No. A249 72 0100

Subject: Check / Replacement of centrifugal compressor.

The technical information contained in this document has been approved 

under the Design Organization Approval No. EASA.21J.070.

Version: H

Reason for update: introduction of a centrifugal impeller and inducer 

assembly P/N.

 SB_A249_72_0100_EN - H <May 21, 2015> - 1 / 15
MANDATORY SERVICE BULLETIN 

ALERT

1. Compliance conditions

A. Mandatory Service Bulletin (SB) effectivity date

Date on which this Mandatory SB becomes effective and must systematically be complied 

with, according to the conditions of application.

If these resources are available any earlier, the Mandatory SB may, as an exception, be 

applied prior to the effectivity date. 

APRIL 1997

B. Effectivity

Application of this Mandatory SB is considered mandatory as a result of a technical 

requirement which might affect flight safety of engines in service. It may be done as defined 

by the effectivity code given in the table below.

Effectivity Code 

TURMO IVC 1

2. Purpose

The purpose of this mandatory SB is to define the inspections to be carried out to detect the 

presence of corrosion pitting or impact likely to cause cracks on the centrifugal compressor 

inducer blades or to detect the presence of cracks on the centrifugal compressor inducer 

blades, and to replace the cracked, impacted or corroded compressors.

The aim of version G of this Mandatory SB is to modify the frequencies of these inspections as 

a result of experience acquired in service and of specific vibratory checks performed by 

TURBOMECA when manufacturing centrifugal compressor inducers modified to TU 224

standard.

Version H of this Mandatory Service Bulletin is being issued in order to announce the reference 

number for centrifugal compressor assembly 0 249 25 811 0, pertaining to modification TU236,

in order to define maintenance actions associated with this standard (modified TU 224 and TU 

236).

3. Reason

Detach of one or several splinters of centrifugal compressor inducer blades following fatigue 

cracking of this (these) blade(s) has caused several power drop or in-flight engine shut-down

Cracking is either caused by a corrosion phenomena or by an impact together with a vibratory 

sollicitation in the rating envelope of between 80 and 83%, or following superposition of 

vibratory resonances of the inducer.

Several standards of centrifugal compressor inducer have been developped by TURBOMECA, 

having a different behaviour with the experience gained.

Routine inspections (ultrasonic, Eddy current or borescopic inspections) are recommended at 

various deadlines according to the different standards of inducers and to the experience gained

(refer to paragraph 5. Required actions and compliance times).

Moreover, a specific vibratory inspection during manufacturing post TU 224 inducers has been 

implemented in March 2001 to prevent superposition of vibratory resonances. Since then, the 

experience gained in operation shows that no crack linked to this damage scenario has been 

noticed on this inducer standard.

 SB_A249_72_0100_EN - H <May 21, 2015> - 2 / 15
MANDATORY SERVICE BULLETIN 

ALERT

Post TU 224 inducers that have not been the subject of this vibratory inspection (manufactured 

before March 2001) are listed in Appendix 2.

The aim of version G of this Mandatory SB is to take into account above elements in the 

compliance conditions definition for the inducers being part of centrifugal compressor P/N 0 249 

25 790 0 or 0 249 25 811 0 (post TU 224) that have been the subject of a vibratory check 

during manufacture and to also take into account engine operation conditions (refer to 

paragraph 5. Required actions and compliance times). Moreover, the compliance conditions 

have been reinforced for the engines modified to TU 197 or TU 215 standard.

4. Description

The borescope inspection of the inducer is described in paragraph 6.B.(1).

The check / replacement of the centrifugal compressor is described in the MTI entitled 

"Check/replacement of the centrifugal compressor" Ref. X 249 66 450 2.

5. Required actions and compliance times

A. At the operator's site, at a TURBOMECA-approved Service Center or at a 

TURBOMECA-approved Maintenance Center

Borescope inspection of the centrifugal compressor inducer per paragraph 6.

For the compliance conditions, refer to the table in Appendix 1 of this Mandatory SB.

B. At a TURBOMECA-approved Repair Center

(1) For post TU 224 engines that respect the double following condition:

(a) Centrifugal compressor assembly bears P/N 0 249 25 790 0 or

0 249 25 811 0 (comprising the inducer 2 249 25 138 0 and 

impeller 2 249 25 158 0).

(b) Serial Number (S/N) of centrifugal compressor inducer is not listed in 

Appendix 2.

Eddy current or ultrasonic inspection of the centrifugal compressor inducer during 

engine overhaul.

(2) For the post TU 224 engines other than the ones addressed in paragraph 5.B(1)

and for pre TU 224 engines.

Eddy current or ultrasonic inspection of the centrifugal compressor inducer upon any 

return of the engine to a repair workshop, even if this inspection requires special 

disassembly, unless the inspection has already been carried out “on-site” because the 

engine had not reached the term of its renewal.

6. Accomplishment Instructions

A. Implementation

- Depending on the type of air intake, the borescope inspection of the centrifugal 

compressor inducer can be performed with the engine installed on or removed from the 

helicopter.

- The eddy current or ultrasonic inspection of the centrifugal compressor inducer 

necessitates removing the engine from the helicopter.

- BEFORE performing the borescope inspection, clean the air path: refer to 

Maintenance Manual, chapter 72-30-01.

- BEFORE removing the engine for inducer inspection, perform the preliminary 

inspections defined in MTI Ref. X 249 66 450 2.

 SB_A249_72_0100_EN - H <May 21, 2015> - 3 / 15
MANDATORY SERVICE BULLETIN 

ALERT

(1) At the operator's site, at a TURBOMECA-approved Service Center or at a 

TURBOMECA-approved Maintenance Center

(a) By the operator

Perform borescopic inspection of centrifugal compressor inducer.

(b) By a TURBOMECA-qualified technician

Perform Eddy current or ultrasonic inspection of centrifugal compressor inducer

(2) At a TURBOMECA-approved Repair Center

Perform Eddy current or ultrasonic inspection of centrifugal compressor inducer if the 

inspection has not already been carried out “on-site” or at a Maintenance Center.

B. Operating instructions

(1) At the operator's site, at a TURBOMECA-approved Service Center or at a 

TURBOMECA-approved Maintenance Center

(a) By the operator

1 Borescope inspection of the centrifugal compressor inducer

1.1 Check axial compressor blades: refer to Maintenance Manual, chapter 

72-30-01.

1.2 Insert a flexible borescope (L 900 mm, diameter 6 mm (forwardlooking) into the low point of the air intake.

1.3 Identify and align one of the blades of the axial compressor with the 

lower strut of the intake casing.

1.4 Push the borescope between two of the axial compressor and stator 

blades and position it so that you can see two of the inducer blades.

1.5 Starting from the tip of the inducer blade, check in particular the 

condition of the leading edge and the adjoining zone A (see figure).

1.6 Fully remove the borescope from the axial compressor. Manually rotate 

the axial compressor to move it on by one blade in relation to the lower 

strut of the intake casing.

1.7 Insert the borescope and check a new area of two inducer blades.

1.8 Once you have accessed each blade (13 blades in total), repeat 

operations 1.1 à 1.6.

1.9 No corrosion pitting, no impact, no crack is acceptable.

(b) By a TURBOMECA-qualified technician

Perform Eddy current or ultrasonic inspection of centrifugal compressor inducer: 

refer to MTI Ref. X 249 66 450 2.

(2) At a TURBOMECA-approved Repair Center

Perform Eddy current or ultrasonic inspection of centrifugal compressor inducer: refer 

to the Overhaul Manual.

C. Reconditioning and checks

(1) At the operator's site, at a TURBOMECA-approved Service Center or at a 

TURBOMECA-approved Maintenance Center

(a) After centrifugal compressor inspection per MTI Ref. X 249 66 450 2.

1 Record the results obtained for each inspection in the maintenance operation 

report describing the work performed: refer to MTI Ref. X 249 66 450 2.

2 Top up the oil tank and oil cooler: refer to Maintenance Manual, chapter

72-80-01.

3 Perform a ground run check and check engine sealing: refer to Maintenance 

Manual, chapter 71-00-04.

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MANDATORY SERVICE BULLETIN 

ALERT

4 Perform a vibration check: refer to Maintenance Manual, chapter 71-00-07.

5 Check the oil level within fifteen minutes of engine shut-down: refer to 

Maintenance Manual, chapter 05-10-01.

6 Check the magnetic plug: refer to Maintenance Manual, chapter 72-80-05.

7 Perform the checks provided for in the Flight Manual in the event of engine 

replacement.

8 Perform a dilution check after five operating hours: refer to Maintenance 

Manual, chapter 72-80-01.

9 Take a sample for SOA after five operating hours: refer to Maintenance 

Manual, chapter 72-80-01.

(b) After borescope inspection of centrifugal compressor inducer:

Perform a ground run check: refer to Maintenance Manual, chapter 71-00-04.

(2) At a TURBOMECA-approved Repair Center

Refer to the Overhaul Manual.

D. Identification

(1) At the operator's site, at a TURBOMECA-approved Service Center or at a 

TURBOMECA-approved Maintenance Center

(a) Complete and return MTI operation report to TURBOMECA.

(b) Record the engine log book (current or unique) as follows:

1 In the current engine log book:

- Record the application of Mandatory SB No. A249 72 0100 in section 

« E ».

2 In the unique engine log book:

- Record the application of Mandatory SB No. A249 72 0100 in section 

« A ».

(c) If the centrifugal compressor has been replaced, update availability status in 

section « D » of the engine log book.

(d) If the MTI has been applied, notify TURBOMECA that Mandatory SB No. 

A249 72 0100 has been applied by returning the fully completed compliance 

certificate (Appendix 3).

(2) At a TURBOMECA-approved Repair Center

(a) Record the engine log book (current or unique) as follows:

1 In the current engine log book:

- Record the application of Mandatory SB No. A249 72 0100 in section 

« E ».

2 In the unique engine log book:

- Record the application of Mandatory SB No. A249 72 0100 in section 

« A ».

(b) Notify TURBOMECA that Mandatory SB No. A249 72 0100 has been applied by 

returning the fully completed compliance certificate (Appendix 3).

E. Routine maintenance

No modification to the routine maintenance.

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MANDATORY SERVICE BULLETIN 

ALERT

7. Material information

A. Basic information

The parts list provided below and required for the application of this Mandatory SB is for 

one engine.

B. List of parts

(1) At the operator's site, at a TURBOMECA-approved Service Center or at a 

TURBOMECA-approved Maintenance Center

(a) For the operator

Refer to the Maintenance Manual.

(b) For a TURBOMECA-qualified technician

Refer to MTI Ref. X 249 66 450 2.

(2) At a TURBOMECA-approved Repair Center

Refer to the Overhaul Manual.

C. Supply conditions for the application of MTI Ref. X 249 66 450 2

Supplies will be provisioned by personnel responsible for performing the operation:

T

U

R

B

O

M

E

C

A

N

O

R

I

A

For Africa, Europe, Middle East For North and Central America

Team Tarnos

Service NORIA

40220 TARNOS - France

Fax : +33 (0) 5 59 74 45 72

noria-tarnos-1stgeneration@ turbomeca.fr

Team Dallas

2709 Forum Drive

Grand Prairie, TX 75052 - USA

Fax : +1 972 606 76 68

noria-dallas@turbomeca.com

Team UK

Concorde Way

Segensworth North, Fareham

Hants PO15 5RL - United Kingdom

noria-tmuk@turbomeca.co.uk

Team Canada

11800, rue Helen-Bristol

J7N 3G8 QC MIRABEL -Canada

Fax : +1 450 476 1449

noria-mirabel@turbomeca.ca

Team Hamburg

Borsteler Chaussee 43

22453 Hamburg - Germany

Fax:+49 40 500 216 61

noria-hamburg@turbomeca.de

Team Mexico

Montes Urales 505 Piso 3

Colonia Lomas de Chapultepec 11000 -

Mexico DF

noria-mexico@turbomeca.com.mx

For Australasia, Oceania, Japan For South America

Team Sydney

115 Wackett St, Bankstown Airport

Bankstown, NSW 2200 - Australia

Fax : +61 2 9791 6708

noria-sydney@turbomeca.com.au

Team Rio

Rua Capitão Guynemer, 1626 – Xerém

CEP : 25250-130 – Duque de Caxias - RJ -

Brasil

Fax : +55 21 2679 2794

noria-rio@turbomeca.com.br

For Asia Pacific

Team Singapore

63 Loyang Way, Singapore 508753

Fax:+65 6545 4978

noria.singapore@turbomeca.com.sg

 SB_A249_72_0100_EN - H <May 21, 2015> - 6 / 15
MANDATORY SERVICE BULLETIN 

ALERT

8. Manpower

A. At the operator's site, at a TURBOMECA-approved Service Center or at a 

TURBOMECA-approved Maintenance Center

(1) By the operator

- Personnel: 1 mechanic.

- Time required: 1 man-hour (borescope inspection of the centrifugal compressor 

inducer).

(2) By a TURBOMECA-qualified technician

- Personnel: 1 technician qualified by TURBOMECA for this operation.

- Time required: 39 man-hours (application of MTI Ref. X 249 66 450 2).

B. At a TURBOMECA-approved Repair Center

- Personnel of approved Repair Center.

- Time determined by the Repair Center as being appropriate for this level of intervention.

9. Tooling and/or products

A. At the operator's site, at a TURBOMECA-approved Service Center or at a 

TURBOMECA-approved Maintenance Center

(1) By the operator

- Mechanic's standard tooling.

- Flexible borescope L 900 mm dia. 6 mm (forward-looking).

- Light generator.

(2) By a TURBOMECA-qualified technician

Refer to MTI Ref. X 249 66 450 2.

B. At a TURBOMECA-approved Repair Center

Refer to the Overhaul Manual.

10. Weight and balance

Not applicable.

11. Publication references

- TURMO IV Maintenance Manual................................................................. Ref. 279 02 932.

- TURMO IV MTI for the check / replacement of the centrifugal compressor Ref. X 249 66 450 2.

- TURMO IV Spare Parts Catalog.................................................................. Ref. 249 92 935.

- TURMO IIIC4/IV Overhaul Manual .............................................................. Ref. 249 92 934.

- TURMO IIIC4/TURMO IV Illustrated Parts Catalog ..................................... Ref. 249 92 938.

- Helicopter Maintenance Manual.

- Flight Manual.

12. Approval

The technical information contained in this document has been approved under the Design 

Organization Approval No. EASA.21J.070.

This Mandatory SB is subject to an Airworthiness Directive.

 SB_A249_72_0100_EN - H <May 21, 2015> - 7 / 15
MANDATORY SERVICE BULLETIN 

ALERT

FIGURE

Sommet de pale

Blade tip

Zone AArea A

BA

LE

BF

TE

 SB_A249_72_0100_EN - H <May 21, 2015> - 8 / 15
MANDATORY SERVICE BULLETIN 

Compliance conditions

Maintenance task 

to be performed

Application deadline 

All engines

If inspection of inducer per MTI Ref. 

X 249 66 450 2

Inspection of impeller per 

MTI Ref. X 249 66 450 2.

Simultanously to 

inspection of inducer

All engines

if specific 

occurrences are 

observed

In case of impact on the axial 

compressor (refer to Maintenance 

Manual, chapter 72-30-01)

Borescope inspection of 

centrifugal compressor 

inducer [see para. 6.B.(1)].

Before next flight

In case of engine surge

1) Record the surge in the 

engine log book and notify 

TURBOMECA or the 

nearest network member 

using Appendix 1 of 

General Service Letter 

No. 1884/99.

2) Remove the engine

Before next flight

In the event of significant clogging 

of the compressor casing (adhesion 

on casing struts)

Inspection of centrifugal 

compressor inducer per MTI 

Ref. X 249 66 450 2.

Within the next 50 flight 

hours following the 

findings

Clean 

must 

Manu

ANNEXE 1 (1/4) / APPENDIX 1 (1/4)

 SB_A249_72_0100_E
MANDATORY SERVICE BULLETIN 

Compliance conditions

Maintenance task 

to be performed

Application d

Engines without 

the following 

modifications:

TU 191, 

TU 197, TU 215

or TU 224

If, upon receiving this Mandatory SB, the compressor 

inducer has operated for more than 100 flight hours** 

or more than 12 months since the last centrifugal 

compressor check per MTI X 249 66 450 2 in deep 

maintenance or engine repair or overhaul (or since 

its last manufacture if never inspected).

Borescopic inspection 

of centrifugal 

compressor inducer

[see para. 6.B.(1)]

Before next flight

If, upon receiving this Mandatory SB, the compressor 

inducer has operated for less than 100 flight hours** 

or less than 12 months since the last centrifugal 

compressor check per MTI X 249 66 450 2 in deep 

maintenance or engine repair or overhaul (or since 

its last manufacture if never inspected).

Within the next 50 fligh

6 months (whichever is 

Engines 

modified to 

TU 197 or 

TU 215

standard

Replacement of 

centrifugal 

compressor with one 

provided with a post 

TU 224 inducer

Before next flight

* NOTE 1: The borescope inspection will not have to be performed during the check of the inducer per MTI. X 249 66 450 

**NOTE 2: The data concerning the operating time of the centrifugal compressor inducer is available on the “Statement of 

the engine log book. If the engine has been subject to an on-site check, this is recorded in section "E" of the en

If it is difficult to determine the operating time of the inducer, contact TURBOMECA or the nearest network mem

ANNEXE 1 (2/4) / APPENDIX 1 (2/4)

 SB_A249_72_0100_EN 
MANDATORY SERVICE BULLETIN 

Compliance conditions

Maintenance task 

to be carried out 

Applic

- Post TU 191 engines

or

- post TU 224 engines

with centrifugal 

compressor assembly 

P/N 0 249 25 802 0 * 

or

- post TU 224 engines

respecting the following 

double condition:

. Fitted with centrifugal 

compressor assembly 

P/N 0 249 25 790 0 *

or 0 249 25 811 0 * and

. Inducer S/N that is 

listed in Appendix 2

If, upon receiving this Mandatory SB, the compressor 

inducer has operated for more than 1000 hours** since 

the last centrifugal compressor check per MTI X 249 

66 450 2 in deep maintenance or engine repair or 

overhaul (or since its last manufacture if never 

inspected).

Inspection of 

centrifugal compressor 

inducer per MTI Ref. 

X 249 66 450 2.

Before nex

If, upon receiving this Mandatory SB, the compressor 

inducer has operated for less than 1000 h** since the 

last centrifugal compressor check per MTI X 249 

66 450 2 in deep maintenance or engine repair or overhaul

(or since its last manufacture if never inspected).

Borescope inspection 

of centrifugal 

compressor inducer

[see para. 6.B.(1)].

Within the 

hours or 6 

(whicheve

* NOTE 1: The assembly 0249258020 comprises inducer 2 249 25 138 0 and impeller 0 249 25 164 0 ; the assembly 0 

comprises inducer 2 249 25 138 0 and impeller 2 249 25 158 0.

** NOTE 2: The data concerning the operating time of the centrifugal compressor inducer is available on the “Statement 

and cycles” sheet in the engine log book. If the engine has been subject to an on-site check, this is recorded 

book.

If it is difficult to determine the operating time of the inducer, contact TURBOMECA or the nearest network m

*** NOTE 3 : The borescope inspection will not have to be performed during the check of the inducer per MTI. X 249 66 4

ANNEXE 1 (3/4) / APPENDIX 1 (3/4)

 SB_A249_72_0100_EN 
MANDATORY SERVICE BULLETIN 

Compliance conditions

Maintenance 

task to be 

carried out 

Application de

Post TU 224

engines

respecting the 

following double 

condition:

- Fitted with 

centrifugal 

compressor 

assembly P/N 

0 249 25 790 0*

or 0 249 25 811 0

* and

- centrifugal 

compressor 

inducer S/N that 

is not listed in 

Appendix 2

If, upon receiving this Mandatory SB, the compressor 

inducer has operated for more than 1000 hours** since the 

last centrifugal compressor check per MTI X 249 66 450 2 

in deep maintenance or engine repair or overhaul (or since 

its last manufacture if never inspected).

Borescope 

inspection of 

centrifugal 

compressor 

inducer [see

para. 6.B.(1)].

Before next flight 

If, upon receiving this Mandatory SB, the compressor 

inducer has operated for less than 1000 hours** since the 

last centrifugal compressor check per MTI X 249 66 450 2 

in deep maintenance or engine repair or overhaul (or since 

its last manufacture if never inspected).

Within the next 50 fligh

months (whichever is re

Inspection of 

centrifugal 

compressor 

inducer per MTI 

Ref. 

X 249 66 450 2.

At the latest, when the 

compressor inducer wil

reached 3000 ± 10 fligh

the last centrifugal com

per MTI X 249 66 450 2 

repair or overhaul (or s

manufacture if never in

*NOTE 1: The assembly 0 249 25 790 0 or 0 249 25 811 0 comprises inducer 2 249 25 138 0 and impeller 2 249 25 158 0.

**NOTE 2: The data concerning the operating time of the centrifugal compressor inducer is available on the “Statement of lif

the engine log book. If the engine has been subject to an on-site check, this is recorded in section "E" of the engi

operating time of the inducer, contact TURBOMECA or the nearest network member.

ANNEXE 1 (4/4) / APPENDIX 1 (4/4)

 SB_A249_72_0100_EN 
SERVICE BULLETIN IMPERATIF

ALERT

Numéros de Série 

roues d’entrée compresseur centrifuge Réf. 2 249 25 138 0

Serial Numbers (S/N) of centrifugal compressor inducers P/N 2 249 25 138 0

3594AD 3631AD 3688AD 3764AD 3871AD 3907AD

3595AD 3633AD 3689AD 3765AD 3872AD 3908AD

3596AD 3634AD 3690AD 3766AD 3873AD 3910AD

3597AD 3635AD 3691AD 3767AD 3874AD 3911AD

3599AD 3636AD 3692AD 3768AD 3875AD 3912AD

3600AD 3637AD 3714AD 3769AD 3876AD 3913AD

3601AD 3638AD 3715AD 3770AD 3877AD 3914AD

3603AD 3639AD 3716AD 3771AD 3878AD 3916AD

3604AD 3640AD 3717AD 3772AD 3879AD 3917AD

3606AD 3641AD 3718AD 3773AD 3880AD 3918AD

3607AD 3642AD 3719AD 3835AD 3881AD 3919AD

3609AD 3643AD 3720AD 3840AD 3882AD 3920AD

3610AD 3645AD 3721AD 3843AD 3883AD 3921AD

3611AD 3646AD 3722AD 3844AD 3884AD 3922AD

3612AD 3647AD 3723AD 3849AD 3885AD 3924AD

3613AD 3648AD 3724AD 3850AD 3886AD 3925AD

3614AD 3649AD 3725AD 3851AD 3887AD 3926AD

3615AD 3653AD 3726AD 3853AD 3888AD 3928AD

3616AD 3670AD 3728AD 3854AD 3890AD 3929AD

3617AD 3671AD 3729AD 3855AD 3891AD 3931AD

3618AD 3672AD 3730AD 3856AD 3893AD 3932AD

3619AD 3674AD 3732AD 3857AD 3894AD 3933AD

3620AD 3675AD 3733AD 3859AD 3895AD 3935AD

3621AD 3676AD 3754AD 3860AD 3896AD 3936AD

3622AD 3678AD 3755AD 3861AD 3897AD 3937AD

3623AD 3679AD 3756AD 3862AD 3899AD 3939AD

3624AD 3680AD 3757AD 3863AD 3900AD 3940AD

3625AD 3681AD 3758AD 3864AD 3901AD 3941AD

3626AD 3682AD 3759AD 3865AD 3902AD 3942AD

3627AD 3683AD 3760AD 3866AD 3903AD 3943AD

3628AD 3685AD 3761AD 3867AD 3904AD 3944AD

3629AD 3686AD 3762AD 3868AD 3905AD 3945AD

3630AD 3687AD 3763AD 3870AD 3906AD 3946AD

ANNEXE 2 (1/2) / APPENDIX 2 (1/2)

 SB_A249_72_0100_EN - H <May 21, 2015> - 13 / 15
SERVICE BULLETIN IMPERATIF

ALERT

Numéros de Série 

roues d’entrée compresseur centrifuge Réf. 2 249 25 138 0

Serial Numbers (S/N) of centrifugal compressor inducers P/N 2 249 25 138 0

3947AD 3997AD 4080AD

3948AD 3999AD 4083AD

3949AD 4001AD 4084AD

3950AD 4004AD 4088AD

3951AD 4005AD 4089AD

3952AD 4006AD 4092AD

3955AD 4007AD 4100AD

3956AD 4008AD

3958AD 4009AD

3960AD 4010AD

3961AD 4011AD

3964AD 4012AD

3965AD 4013AD

3966AD 4016AD

3967AD 4017AD

3969AD 4018AD

3970AD 4023AD

3972AD 4061AD

3973AD 4062AD

3975AD 4063AD

3976AD 4064AD

3978AD 4065AD

3982AD 4066AD

3984AD 4067AD

3985AD 4068AD

3986AD 4069AD

3987AD 4070AD

3989AD 4071AD

3990AD 4072AD

3991AD 4075AD

3992AD 4076AD

3995AD 4077AD

3996AD 4078AD

ANNEXE 2 (2/2) / APPENDIX 2 (2/2)

 SB_A249_72_0100_EN - H <May 21, 2015> - 14 / 15
SERVICE BULLETIN IMPERATIF

ALERT

Objet : Attestation d’inspection ou de remplacement du compresseur 

centrifuge.

Subject: Compliance certificate for centrifugal compressor check or 

replacement.

Important / Important notice (NORIA) :

Après application des instructions spécifiées dans ce SB Impératif, veuillez compléter la présente 

attestation et la retourner auprès de votre coordinateur NORIA local par courrier ou courriel ou fax : se 

reporter au paragraphe 7.C.

After application of the instructions specified in this Mandatory SB, please complete this certificate and return it 

to your local NORIA coordinator by mail or email or fax: refer to paragraph 7.C.

Information concernant le matériel / Equipment information

Utilisateur

Customer

N° Appareil

Aircraft S/N

N/S - S/N Réf. - P/N TSN* TSO* CSN* CSO*

Moteur 

Engine

Générateur de gaz 

Gas generator

Turbine libre 

Free turbine

Compresseur centrifuge 

contrôlé

Checked centrifugal compressor 

Roue d’entrée

Inducer

Rouet centrifuge

Impeller

Compresseur centrifuge 

monté si remplacé

Centrifugal compressor installed 

if replaced

Roue d’entrée

Inducer

Rouet centrifuge

Impeller

* TSN = Time Since New (Heures depuis neuf) TSO = Time Since Overhaul (Heures depuis RG)

CSN = Cycles Since New (Cycles depuis neuf) CSO = Cycles Since Overhaul (Cycles depuis RG)

Opération effectuée par :

Work performed by:

Je certifie que le moteur identifié ci-dessus a été controlé ou modifié selon les directives de ce SB 

Impératif.

I certify that the above-mentioned engine has been controled or modified according to the directives given in 

this Mandatory SB. Date [JJ / MMMM (en lettre) / AAAA 

or DD / MMMM (letter) / YYYY]

Nom / Print name Fonction / Job title

ANNEXE 3 / APPENDIX 3

Signature :

 SB_A249_72_0100_EN - H <May 21, 2015> - 15 / 15