## BOLLETTINO TECNICO N° 

# 109

- 147

The technical content of this document is approved under the authority of DOA nr EASA.21J.005. DATE March 25 th

, 2 015

REV. April 07 , 2011

Compliance with this bulletin is:

Pa ge 1 of 4 SUBJECT: TAIL ROTOR DRIVE SHAFT P/N 109-8412- 02 -1 and -3.

REASON: Provide the necessary instructions to inspect the tail rotor drive shaft

assy P/N 109-8412- 02

- 1 and - 3 for cracks.

HELICOPTERS AFFECTED:

 All the AgustaWestland A109 A helicopters that install the retrofit kit 109 -0820- 27

- 101 by application of BT 109-045.

 All the AgustaWestland A109 AII / C helicopters.

COMPLIANCE:

Within and not later than 50 flight hours or 3 months after the date of issuance of this Bollettino Tecnico.

DESCRIPTION:

During a scheduled servicing on an A109S three cracks have been found on the tail rotor drive shaft assy P/N 109-8412- 02

- 1. Cracks are not related to fatigue failure of the shaft subject to the design loads. As a precautionary measure AgustaWestland has issued this Bollettino Tecnico to prescribe a “ one time ” tail rotor drive shaft inspection for cracks within the time allowed in the “COMPLIANCE” paragraph.

REQUIRED MANPOWER:

An estimated 9 manpower hours are required for compliance with this Bollettino.

WARRANTY:

Owners/Operators who comply with the instructions of this Bulletin, no later than the applicable date in the “Compliance section” will be eligible to receive REQUIRED MATERIALS on free of charge basis.B.T. 109

- 147

Page 2 of 4 NOTE: Customers who fail to comply with the instructions in this bulletin

before the compliance date are not eligible for the aforementioned special policy. Please Issue relevant M.M.I.R. form ( (M)ai ntenance (M)alfunction (I)nformation (R)eport ) to your Warranty Administration Dpt

.

REQUIRED MATERIALS:

The following material s may be required to apply this Bollettino if the prescribed inspection give s negative results :

P/N DENOMINATION Q.TY 109

- 8412

- 02

- 1 TR drive shaft assy A.R. 109

- 8412

- 02

- 3 TR drive shaft assy A.R

. The following consumable material is required to apply this Bollettino:

SPECIFICATION DENOMINATION Q.TY TT

- N

- 95 Aliphatic Naphtha A.R. Ty 2 (Code 531055030) MIL

- C

- 16173D Corrosion inhibitor A.R. Grade 2 CL 2 (Code 999999999000000194)

SPECIAL TOOLS:

M agnifying glass 5X

WEIGHT AND BALANCE CHANGES:

N.A.

REFERENCES:

Pertinent Maintenance Manual

.

PUBLICATIONS AFFECTED:

N.A.

COMPLIANCE INSTRUCTIONS:

1. Prepare the helicopter on ground for a safe maintenance and disconnect any power supply , in accordance with the instructions given in the Pertinent Maintenance Manual

.

2. Gain access to the tail rotor drive shaft opening all the necessary doors and panel s in accordance with the instructions given in the Pertinent Maintenance Manual

.

3. Remove both tail rotor drive shaft assemblies P/N 109

- 8412

- 02

- 1 and

- 3 in accordance with the instructions given in the Pertinent Maintenance Manual

.

4. Perform the inspection of the tail rotor drive shaft s for cracks as follows:B.T. 109

- 147

Page 3 of 4 4.1. Clean the components of the tail rotor drive shaft installation with the clean Cloth and the Aliphatic naphtha.

4.2. Dry with filtered compressed air.

CAUTION Apply the Corrosion inhibitor to the tail rotor drive shaft components if you do not do the inspection immediately after their removal and cleaning.

4.3. Examine the external surface of the Tail rotor shaft P/N 109

- 8412

- 02

- 1 and

- 3 for cracks with the help of the M agnifying glass 5X and a source of light.

5. If no cracks are found reinstall the TR drive shaft in accordance with the instructions given in the Pertinent Maintenance Manual and go to step 7

.

6. If cracks are found replace the TR drive shaft assy P/N 109

- 8412

- 02

- 1 and/ or

- 3 (depending of inspection re sults) with a new one in accordance with the instructions given in the Pertinent Maintenance Manual

.

7. Reinstall all the panels and close all the doors removed or opene d in the step 2.

8. Return the helicopter to a ready to flight condition.

9. Send the attached compliance form to the following email box: Aw109.mbx@agustawestland.com

. As an alternative, gain access to My Communications section on Leonardo Web Portal on AW website and compile the “Technical Bulletin Application Communication

.B.T. 109

- 147

Page 4 of 4 

# FIGURE 1

(Crack Example)Note: Remarks:

Informazioni: Information:
Al fine di gestire le varianti alla configur azione base, in relazione all’emissione de l Bollettino Tecnico, preghiamo di voler compilare il presente modulo in tutte le sue parti e sped irlo all’indirizzo sopra indicato. Si ring razia per la gentile collaborazione data.
We request your cooperation in filling this form, in order to keep out statistical data relevant to aircraft configuration up- to-date. The form should be filled in all its parts and sent to the above address. We thank you beforehand for the information given. **MODULO APPLICAZIONE BOLLETTINO TECNICO** TECHNICAL BULLETIN COMPLIANCE FORM Data: Date:

Numero: Number:

Revisione: Revision: Prego spedire a questo indirizzo: Please send to the following address: 

### AGUSTA **WESTLAND S.p.A.** 
CUSTOMER SUPPORT & SERVICES - ITALY
PRODUCT SUPPORT ENGINEERING DPT.
Via del Gregge, 100 2101 5 Lonate Pozzolo (VA) - I T ALY T el

. : +39 0331 664905 Fa x : +39 0331 66468 4

Telefono: Telephone:

Fax:

Data Applicazione B.T.: B.T. Compliance Date: Denominazione Cliente ed Indirizzo: Customer Name and Address:

Modello Elicottero

Helicopter Model S/N Matricola Tail Number Ore Totali Total Hours Ore D.U.R. T.S.O.