### ERRATA CORRIGE

Please find here attached the page that have to be replaced in the basic Bollettino Tecnico n° 1 0 9 S P

- 0 69

.



### PAGE 4 “ STEP N° 3 ”

Was:

3. In accordance with the figure 1 and 2 remove the nuts MS21042L4 and replace it with nuts NAS1805

- 4. Torque the nuts NAS1805

- 4 to 5.6 thru 7.9 N m “..... 9. N 6603

- 2 BOLT Became:

3. In accordance with 0B

- A

- AMP

- 00

- X Maintenance Publication and the figure 1 and 2 remove the nuts MS21042L4 and replace it with nuts NAS1805

- 4. Torque the nuts NAS1805

- 4 to 5.6 thru 7.9 N m. 10. NAS6603

- 2 BOLTTRANSLATION OF



## BOLLETTINO TECNICO N° 

# 109SP-069

The technical content of this document is approved under the authority of DOA nr EASA.21J.005. DATE September 20

, 2013

REV. A April 07 , 2011

Compliance with this bollettino is:



# ALERT Page 1 of 7 SUBJECT: ONE TIME I NSPECTION OF THE NUT S MS21042L4 ON THE TAIL

ROTOR DRIVE SHAFT LINE AND SUBSEQUENT REPLACEMENT WITH THE NUTS NAS1805

- 4

.

REASON: Provide the nec essary instructions to perform a one time visual

inspection for possible presence of cracks on nut s MS21042L4 installed on the tail rotor drive shaft line (PART I) and subsequent replacement with nuts NAS1805

- 4 (PART II)

.

HELICOPTERS AFFECTED:

All the Agusta AW109SP helicopters up to S/N 22316 included, except S/N 22284, 22286, 22307 and 22308.

COMPLIANCE:

PART I: At receipt of this Bollettino and before the next flight

PART II: Within and not later than the next 1 0FH/30 days after the applicat ion of the PART I of this Bollettino

.

DESCRIPTION:

On two in service AW109SP helicopters, during scheduled inspection on the tail rotor drive shaft line, one nut MS21042L4 that connect the Thomas c oupling with the splined adapter was found cracked

. The performed investigations have revealed that the crack reported on the nut is due to a production deficiency (causing hydrogen embrittlement) from the standard nut supplier

. This Bollettino is issued in order to provide the necessary instructions to perform a one time visual inspection to verify the presence of cracks on the n°16 nuts MS21042L4 installed on the tail rotor drive shaft lineB.T. 109SP

- 069

Page 2 of 7 (PART I) and the necessary instructions to replace, on the tail rotor drive

shaft line, the nuts MS21042L4 with t he nuts NAS1805

- 4 (PART II)

.

REQUIRED MANPOWER :

PART I: An estimated 2 manpower hours are required for compliance with this Part of this Bollettino.

PART II: An estimated 16 manpower hours are required for compliance with this Part of this Bollettino

WARRANTY :

Within the calendar terms mentioned at point “Compliance”, the parts required to apply the present Bollettino shall be supplied on a free of charge basis by AgustaWestland S.p.A. upon Customer’s request, with the exception for Consumable material s and Tools; all the parts required after the “Compliance date” will be dispatched on charge basis for the Customer.

Upon application of this Bollettino, destroy locally the removed parts.

REQUIRED MATERIALS:

The following material may be required to apply this Bollettino:

P/N DENOMINATION Q.TY NAS1805

- 4 Nut 16

.

SPECIAL TOOLS:

The following special tool could be required for compliance with this Bollettino :

P/N DENOMINATION Commercial Endoscope GE Inspection Tecnologies Model: XL Go A3920 with 4.0 mm diameter and 2 m length probe (or equivalent)

WEIGHT AND BALANCE CHANGES:

N.A.

REFERENCES:

0B

- A

- AMP

- 00

- X Maintenance Publication

. 0B

- A

- IPD

- 00

- X Illustrated Parts Data Publication

PUBLICATIONS AFFECTED:

0B

- A

- IPD

- 00

- X Illustrated Parts Data Publication

.B.T. 109SP

- 069

Page 3 of 7 COMPLIANCE INSTRUCTIONS:

(See figure 1 to 3 ) PART I: 1

. Prepare the helicopter on ground for a safe maintenance, disconnect any power supply, in accordance with the instructions given in the 0B

- A

- AMP

- 00

- X Maintenance Publication.

2. Gain access to the number 1 drive shaft, the number 2 drive shaft and the number 3 drive shaft, in accordance with the instructions given in the 0B

- A

- AMP

- 00

- X Maintenance Publication (Sections 65

- 10 and 06

- 40).

3. Inspect the four nuts connecting the number 1 drive shaft with the adaptor splined for cracks.

NOTE

The use of a light source and a mirror is required. If any doubt remains

, use an endoscope.

4. Inspect the four nuts connecting the number 2 drive shaft with the number 1 drive shaft for cracks.

NOTE The use of a light source and a mirror is required. If any doubt remains

, use an endoscope.

5. Inspect the four nuts connecting the number 2 drive shaft with number 3 drive shaft for cracks.

6. Inspect the four nuts connecting the number 3 drive shaft with the adaptor splined for cracks.

NOTE

The use of a light source, a mirror and an endoscope is required. (See figure 3 for the access point).

7

. If any crack is found, replace all the nuts MS21042L4 with the new NAS1805

- 4 nuts in accordance with the PART II of this Bollettino.

8. If no cracks are found proceed with the following steps.

9. Remove all the tools and other items from the work area. M ake sure that the work area is clean.

10. Install all the access panels and close all the access doors removed/opened during point 2 in accordance with the instructionsB.T. 109SP

- 069

Page 4 of 7 given in the 0B

- A

- AMP

- 00

- X Maintenance Publication (Section 06

-

40).

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

12. Record compliance with the PART I of this Bollettino in the helicopter log book.

PART II : 1 Prepare the helicopter on ground for a safe maintenance, disconnect any power supply, in accordance with the instructions given in the 0B

- A

- AMP

- 00

- X Maintenance Publication.

2. Gain access to the number 1 drive shaft, the number 2 drive shaft and the number 3 drive shaft, in accordance with the ins tructions given in the 0B

- A

- AMP

- 00

- X Maintenance Publication ( Sections 65

- 1 0 and 06

- 40 ).

3. In accordance with the figure 1 and 2 remove the nuts MS21042L4 and replace it with nuts NAS1805

- 4. Torque the nuts NAS1805

- 4 to 5.6 thru 7.9 N m.

NOTE 1 T o avoid the disassembl ing of the T ail R otor shaft is recommended to replace the nuts interested one at a time.

NOTE 2 To perform the replacement of the above mentioned nuts, it may be necessary to remove part of the tail rotor drive shaft line, in accordance with the instructions given in the 0B

- A

- AMP

- 00

- X Maintenance Publication ( Section 65

- 1 0 ).

4. Remove all the tools and other items from the work area. Make sure that the work area is clean.

5. Install all the access panels and close all the a ccess doors removed/opened during point 2 in accordance with the instructions given in the 0B

- A

- AMP

- 00

- X Maintenance Publication

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

7. Record compliance with the PART II of this Bollettino in the helicopter log book.

8. Send the attached compliance form to the following email box: Aw109.mbx@agustawestland.comB.T. 109SP

- 069

Page 4 of 7 given in the 0B

- A

- AMP

- 00

- X Maintenance Publication (Section 06

-

40).

11. Return the he licopter to a ready to flight condition.

12. Record compliance with the PART I of this Bollettino in the helicopter log book.

PART II : 1 Prepare the helicopter on ground for a safe maintenance, disconnect any power supply, in accordance with the instructions given in the 0B

- A

- AMP

- 00

- X Maintenance Publication.

2. Gain access to the number 1 drive shaft, the number 2 drive shaft and the number 3 drive shaft, in accordance with the instructions given in the 0B

- A

- AMP

- 00

- X Maintenance Publication ( Sec tions 65

- 1 0 and 06

- 40 ).

3. In accordance with 0B

- A

- AMP

- 00

- X Maintenance Publication and the figure 1 and 2 remove the nuts MS21042L4 and replace it with nuts NAS1805

- 4. Torque the nuts NAS1805

- 4 to 5.6 thru 7.9 N m. NOTE 1 T o avoid the disassembl ing of the T ail R otor shaft is recommended to replace the nuts interested one at a time.

NOTE 2 To perform the replacement of the above mentioned nuts, it may be necessary to remove part of the tail rotor drive shaft line, in accordance with the instructions given in the 0B

- A

- AMP

- 00

- X Maintenance Publication ( Section 65

- 1 0 ).

4. Remove all the tools and other items from the work area. Make sure that the work area is clean.

5. Install all the access panels and close all the access doors removed/opened during point 2 in accordance with the instructions given in the 0B

- A

- AMP

- 00

- X Maintenance Publication

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

7. Record complianc e with the PART II of this Bollettino in the helicopter log book.

8. Send the attached compliance form to the following email box: Aw109.mbx@agustawestland.comB.T. 109SP

- 069

Page 5 of 7 

# FIGURE 1

ref. 0B

- A

- IPD

- 00

- X Illustrated Parts Data Publication Section 65

- 10 TAIL ROTOR DRIVE SHAFT INSTL,FWD N°1 SPLINED ADAPTER

MS21042 L4 NUT x 2

N°1 THOMAS COUPLING MS21042 L4 NUT x 2

MS21042 L4 NUT x 2 N°2 THOMAS COUPLING N°2 SPLINED

ADAPTER MS21042 L4 NUT x 2

N° 3 SPLINED ADAPTER

MS21042 L4 NUT x 2

N° 3 THOMAS COUPLING

MS21042 L4 NUT x 2B.T. 109SP

- 069

Page 6 of 7 

# FIGURE 2

ref. 0B

- A

- IPD

- 00

- X Illustrated Parts Data Publication Section 65

- 10 DRIVE SHAFT AND 90 DEGREE GEARBOX INSTL N° 4 THOMAS COUPLING

N° 4 SPLINED ADAPTER MS21042 L4 NUT x 2

MS21042 L4 NUT x 2

ENDOSCOPE ACCESS POINTB.T. 109SP

- 069

Page 7 of 7 DETAIL A


# FIGURE 3

For ref. Only ANote: 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.