40220 Tarnos

- France

Tel. +33 (0)5 59 74 40 00 Fax +33 (0)5 59 74 45 15



# SERVICE BULLETIN

Applicable variant s : ASTAZOU XIV B

- H

- M1 post mod. AB 173 or AB 208 

## ASTAZOU XIV No. 283 72 0811

Subject: Rotating assembly.

Reinforced inspection of 3 rd 

## stage turbine wheels P/N 0265257000
or 0265257060.

The technical information contained in this document is approved under the Authority

of Design Organization Approval No. EASA.21J.070.

Date on which this SB becomes effective and must systematically be complied with, according to the
conditions of application.

AS SOON AS THIS SB IS RECEIVED

If the resources needed to perform the procedure (parts, tools, documentation, etc.) are available any earlier, this SB may, as an exception, be applied prior to the effectivity date.



### Version : A



# SB_283_72_0811_EN - A <August 25, 2015> - 1 / 8

# SERVICE BULLETIN

Applicable variants: ASTAZOU XIV B

- H

- M1 post mod. AB 173 or AB 208 § 1

- 1 / 1 

### 1. GENERAL

1.1. Purpose
Detect the presence of any cracks between the balancing plugs on the front face of the 3 rd stage turbine wheel.

1.2. Reason
During the o verhaul of an ASTAZOU XIV engine, a crack located on the front face of the 3 rd stage turbine wheel was detected between two balancing plugs. The cause of the damage is probably linked to a geometric singularity, caused by the transformation operation aimed at introducing expansion slots betw een the blades (modification AB173).

1.3. Description

This SB consists of inspecting the front face of the 3 rd stage turbine wheel in the area of the balancing plugs.

1.4. Approval
The technical information contained in this document has been approved under the Des ign Organization Approval No. EASA.21J.070.

1.5. Conditions of application
The conditions of application of this SB are defined respectively in:

- Chapter §2 regarding application at the operator’s site or by a qualified Maintenance Center for level 1,
2.

- Chapter §3 regarding application by a qualified Maintenance Center for level 3.

- Chapter §4 regarding application at a TURBOMECA

- approved Repair Center.

1.6. Update history

Not applicable.



### END of section §1

" General "



# SB_283_72_0811_EN - A <August 25, 2015> - 2 / 8

# SERVICE BULLETIN

Applicable variants: ASTAZOU XIV B

- H

- M1 post mod. AB 173 or AB 208 § 2

- 1 / 1 

### 2. APPLICATION AT THE O PERATOR’S SITE OR BY A QUALIFIED MAINTENANCE CENTER FOR LEVEL 1, 2

Not applicable.



### END of section §2

" Application at the operator’s site or by a qualified Maintenance Center for level 1, 2 "



# SB_283_72_0811_EN - A <August 25, 2015> - 3 / 8

# SERVICE BULLETIN

Applicable variants: ASTAZOU XIV B

- H

- M1 post mod. AB 173 or AB 208 § 3

- 1 / 1 

### 3. APPLICATION BY A MAI NTENANCE CENTER QUAL IFIED FOR LEVEL 3

Not applicable.



### END of section §3

“ Application by a qualified Maintenance Center for level 3 ”



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# SERVICE BULLETIN

Applicable variants: ASTAZOU XIV B

- H

- M1 post mod. AB 173 or AB 208 § 4

- 1 /4 

### 4. APPLICATION AT A TUR BOMECA

- APPROVED REPAIR CENT ER

4.1. Actions to be performed

Remove the 3 rd stage turbine wheel to inspect the profile of the rim on the front face, at the level of the balancing plugs.

4.2. Effectivity and application times

ENGINE / VARIANT CODE CONDITIONS OF APPLICATION
FOR ENGINES IN SERVICE

Post AB 173 or post AB 208 ASTAZOU XIV B

- H

- M1 2

- 4 Application upon first return to an approved Repair Center, regardless of the reason for return.
This SB must be applied with strict conformity to the conditions of application as specified by the manufacturer according to the effectivity code given in the table above.

4.3. Conditions of application for engines in service

This SB concerns AB 173 modified or AB 208 modified ASTAZOU XIV B

- H

- M1 engines having 3 rd stage turbine
wheel whose Part Number ( section D of the engine log book) is :

- 0 265 25 700 0, whatever the serial number, or

- 0 265 25 706 0, whatever the serial number.

4.4. Accomplishment Instructions

4.4.1. Implementation
Applicable for all engines unless this SB has already been applied.

4.4.2. Procedure

4.4.2.1. Remove the 3 rd stage turbine wheel: refer to Overhaul Manual, chapter 72

- 50

- 20.

4.4.2.2. Perform cleaning of the 3 rd stage turbine wheel: refer to Overhaul Manual, chapter 72

- 50

- 20.

4.4.2.3. Perform a visual inspection of the front and rear faces of the 3 rd stage turbine wheel:

- If there is no groove between the spotfaces on the leading edge side and trailing edge side (Figure 1):

 No further action is required



### No groove Presence of a groove
FIGURE 1



# SB_283_72_0811_EN - A <August 25, 2015> - 5 / 8

# SERVICE BULLETIN

Applicable variants: ASTAZOU XIV B

- H

- M1 post mod. AB 173 or AB 208 § 4

- 2 /4

- If there is a groove between the spotfaces on the leading edge side or trailing edge side (Figure 1):

 If the radius under the platform is machined: scrap the turbine wheel (see Figure 2)

 If the radius is not machined:

o Rework the face according to Overhaul Manual chapter 72

- 50

- 20 if the thickness value of the rim (J) > 22.60 mm, via application of SL

- 0559

- 01. This SL is only applicable once per turbine wheel.

o Check that the groove is entirely eliminated using a circumference , and that the

thickness of the rim is over 22.30 mm.



### Thickness value of rim (J) :

• J ≥ 22.60 mm, rework can be performed
• J < 22.60 mm, rework cannot be performed • J < 22.30 mm, turbine wheel to be scrapped

Area 1: Removed balancing bead

Area 2: Groove to be characterized

Area 3: Radius under platform 

### Depth (P) of groove

> 0 mm and no machining at radius under platform

 Rework of turbine wheel
if thickness of rim is sufficient and no SL01 marking is found.


### Alteration of radius under platform

 Turbine wheel to be scrapped



### Absence of groove and no machining at radius under platform

 Turbine wheel acceptable as is



### FIGURE 2

 Fill in Appendix 4.1 and send it to the address provided. Direction of measurement Direction of measurement

Direction of measurement

Direction of measurement Area 2

Area 1 Area 3 P

Alteration
of radius

Area 3 Area 2 Area 1 J

Absence

of groove



# SB_283_72_0811_EN - A <August 25, 2015> - 6 / 8

# SERVICE BULLETIN

Applicable variants: ASTAZOU XIV B

- H

- M1 post mod. AB 173 or AB 208 § 4

- 3 /4 4.4.3. Reconditioning and checks

Refer to the ASTAZOU XIV Overhaul Manual.

4.5. Information related to parts

4.5.1. List of supplies

Refer to the ASTAZOU XIV Overhaul Manual.

4.5.2. Supply conditions
Your local TURBOMECA Support Center

or
TURBOMECA Support and Services Division Commercial Department 40220 TARNOS - France Fax No. +33 (0) 5 59 74 45 11.

4.6. Manpower

 Personnel of approved Repair Center

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

4.7. Tooling and/or products

Refer to the ASTAZOU XIV Overhaul Manual.

4.8. Weight and balance

Not applicable.

4.9. Publication references

Document Engine Reference
Overhaul Manual (OM) ASTAZOU XIV B

- F

- H

- M

- M1

Illustrated Parts Catalog (IPC) ASTAZOU XIV B

- F

- H 283 01 932

ASTAZOU XIV M

- M1 X 283 98 600 2

Service Bulletin Modification AB 173 No. 72 283 0091

Service Bulletin Modification AB 208 No. 283 72 0117



# SB_283_72_0811_EN - A <August 25, 2015> - 7 / 8 2 X 283 72 500

# SERVICE BULLETIN

Applicable variants: ASTAZOU XIV B

- H

- M1 post mod. AB 173 or AB 208 § 4

- 4 /4 

## Objet : Attestation d’application du SB n° 283 72 0811.
Subject: SB No. 283 72 0811 compliance certificate.

Important / Important notice : Après application des instructions spécifiées dans ce SB, veuillez compléter la présente attestation et la retourner par courrier ou courriel à :
After application of the instructions specified in this SB, please complete this certificate and mail or email or fax it
to:
TURBOMECA, Equipe Administration Base installée / Fleet Data Administrator Team, BP 25

40220 TARNOS

- France

Fax n° / No. +33 (0) 5 59 74 46 95

- Email: fleetdata@turbomeca.fr

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

Roue de turbine
3 ème étage

3 rd stage turbine

w heel

* TSN = Time Since New (Heures depuis neuf) TSO = Time Since Ov erhaul (Heures depuis RG)
CSN = Cycles Since New (Cycles depuis neuf) CSO = Cycles Since Ov erhaul (Cycles depuis RG)

Opération effectuée par / Work performed by:

Résultats du contrôle (cocher la case correspondante) Inspection result : check the corresponding box Conforme Compliant Non conforme

Not compliant

Si non conforme, préciser la non
conformité If not compliant, describe the non

conformity

Je certifie que le moteur identifiée ci

- dessus a été contrôlée selon les directives de ce SB. I certify that the above

- mentioned engine has been checked according to the directives given in this Mandatory SB.

Date [ JJ/MMMM (en lettre)/AAAA
ou/or DD/MMMM (letter)/YYYY ] Nom / Name Fonction / Job title



### ANNEXE 4.1 / APPENDIX 4.1 Signature :

END of section §4

“ Application by a TURBOMECA

- approved Repair Center ”



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