ERRATA CORRIGE

Please find here attached the page that have to be replaced in the basic Bollettino Tecnico 

n°119-061 .

PAGE 1 “HELICOPTERS AFFECTED”

Was:

All the Agusta A119E helicopters up to S/N 14811 included, except S/N 14805 and 14807

“.....9. N6603-2 BOLT

 10.NAS1149C0332R WASHER

Became:

All the Agusta A119/AW119MKII helicopters up to S/N 14811 included, 

 except S/N 14805 and 14807.

PAGE 4 “STEP N° 3”

Was:

3.In accordance with the figures 1 and 2 remove all the nuts MS21042L4 and replace them

with nuts NAS1805-4. Torque the nuts NAS1805-4 to 5.6 thru 7.9 Nm “.....9. N6603-2 

BOLT

Became:

3.In accordance with A119/AW119MKII Maintenance Manual and the figures 1 and 2 remove 

all the nuts MS21042L4 and replace them with nuts NAS1805-4. Torque the nuts NAS1805-4 

to 5.6 thru 7.9 Nm “.....9. NAS1149C0332R WASHER

 10. NAS6603-2 BOLT
ALERT 

TRANSLATION OF 

BOLLETTINO TECNICO N° 119-061 

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 INSPECTION OF THE NUTS MS21042L4 ON THE TAIL 

ROTOR DRIVE SHAFT LINE AND SUBSEQUENT REPLACEMENT 

WITH THE NUTS NAS1805-4. 

REASON: Provide the necessary instructions to perform a one time visual 

inspection for possible presence of cracks on nuts 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 A119E helicopters up to S/N 14811 included, except 

S/N 14805 and 14807.

COMPLIANCE:

PART I:

At receipt of this Bollettino and before the next flight 

PART II:

Within and not later than the next 10FH/30 days after the application 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 coupling 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°21 nuts MS21042L4 installed on the tail rotor drive shaft line 

AgustaWestland S.p.A

Via Giovanni Agusta, 520

21017 Cascina Costa di Samarate (VA) Italy

Tel.: +39 0331 229111 - Fax: +39 0331 229605/222595

MANDATORY

An appropriate entry should be made in the aircraft log book upon accomplishment.

If ownership of aircraft has changed, please, forward to new owner.

ALERT

ALERT

P

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AGE UP

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9- Ey 11 061 C
ALERT

TRANSLATION OF 

BOLLETTINO TECNICO N° 119-061 

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 INSPECTION OF THE NUTS MS21042L4 ON THE TAIL 

ROTOR DRIVE SHAFT LINE AND SUBSEQUENT REPLACEMENT 

WITH THE NUTS NAS1805-4. 

REASON: Provide the necessary instructions to perform a one time visual 

inspection for possible presence of cracks on nuts 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 A119/AW119MKII helicopters up to S/N 14811 included, 

except S/N 14805 and 14807.

COMPLIANCE:

PART I:

At receipt of this Bollettino and before the next flight 

PART II:

Within and not later than the next 10FH/30 days after the application 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 coupling 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°21 nuts MS21042L4 installed on the tail rotor drive shaft line 

AgustaWestland S.p.A

Via Giovanni Agusta, 520

21017 Cascina Costa di Samarate (VA) Italy

Tel.: +39 0331 229111 - Fax: +39 0331 229605/222595

MANDATORY

An appropriate entry should be made in the aircraft log book upon accomplishment.

If ownership of aircraft has changed, please, forward to new owner.

ALERT

ALERT
B.T. 119-061 

Page 2 of 7 

(PART I) and the necessary instructions to replace, on the tail rotor drive 

shaft line, the nuts MS21042L4 with the 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 materials 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 21. 

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:

A119/AW119MKII Maintenance Manual. 

A119/AW119MKII Illustrated Parts Catalog 

PUBLICATIONS AFFECTED:

A119/AW119MKII Illustrated Parts Catalog 
B.T. 119-061 

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 A119/AW119MKII Maintenance Manual. 

2. Gain access to the number 1 drive shaft and the number 2 drive 

shaft, in accordance with the instructions given in the 

A119/AW119MKII Maintenance Manual (Sections 65-10 and 06-

40). 

3. Inspect the six nuts connecting the number 1 drive shaft with the 

sliding adapter CP for cracks. 

NOTE

The use of a light source and a mirror is 

required. If any doubt remains, use an 

endoscope. 

5. Inspect the six nuts connecting the number 2 drive shaft with 

number 1 drive shaft for cracks. 

6. Inspect the six nuts connecting the number 2 drive shaft with the 

sliding adapter 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. Make sure 

that the work area is clean. 

10. Install the access panel and close the access doors previously 

removed/opened in accordance with the instructions given in the 

A119/AW119MKII Maintenance Manual (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. 

 
B.T. 119-061 

Page 4 of 7 

PART II: 

1 Prepare the helicopter on ground for a safe maintenance, 

disconnect any power supply, in accordance with the instructions 

given in the A119/AW119MKII Maintenance Manual. 

2. Gain access to the number 1 drive shaft and the number 2 drive 

shaft, in accordance with the instructions given in the 

A119/AW119MKII Maintenance Manual (Sections 65-10 and 06-

40). 

3. In accordance with the figure 1 and 2 remove all the nuts 

MS21042L4 and replace them with nuts NAS1805-4. Torque the 

nuts NAS1805-4 to 5.6 thru 7.9 N m. 

NOTE 1

To avoid the disassembling of the Tail Rotor 

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 

A119/AW119MKII Maintenance Manual 

(Section65-10). 

4. Remove all the tools and other items from the work area. Make 

sure that the work area is clean. 

5. Install the access panel and close the access doors previously 

removed/opened in accordance with the instructions given in the 

A119/AW119MKII Maintenance Manual 

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: P

Aw109.mbx@agustawestland.com 

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9- Ey 11 061 C
B.T. 119-061 

Page 4 of 7 

PART II: 

1 Prepare the helicopter on ground for a safe maintenance, 

disconnect any power supply, in accordance with the instructions 

given in the A119/AW119MKII Maintenance Manual. 

2. Gain access to the number 1 drive shaft and the number 2 drive 

shaft, in accordance with the instructions given in the 

A119/AW119MKII Maintenance Manual (Sections 65-10 and 06-

40). 

3. In accordance with A119/AW119MKII Maintenance Manual and the 

figures 1 and 2 remove all the nuts MS21042L4 and replace them 

with nuts NAS1805-4. Torque the nuts NAS1805-4 to 5.6 thru 7.9 

Nm. 

NOTE 1

To avoid the disassembling of the Tail Rotor 

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 

A119/AW119MKII Maintenance Manual 

(Section65-10). 

4. Remove all the tools and other items from the work area. Make 

sure that the work area is clean. 

5. Install the access panel and close the access doors previously 

removed/opened in accordance with the instructions given in the 

A119/AW119MKII Maintenance Manual 

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.com 
B.T. 119-061 

Page 5 of 7 

FIGURE 1

N°3 MS21042L4 NUT

THOMAS 

COUPLING
B.T. 119-061 

Page 6 of 7 

FIGURE 2

N°3 MS21042L4 NUT

N°3 MS21042L4 NUT

THOMAS 

COUPLING

N° 1 THOMAS 

COUPLING

N° 2 THOMAS 

COUPLING

N° 3 THOMAS 

COUPLING
B.T. 119-061 

Page 7 of 7 

DETAIL A 

FIGURE 3

For ref. Only 

A 
Note: 

Remarks:

Informazioni: 

Information:

Al fine di gestire le varianti alla configurazione base, in relazione all’emissione del Bollettino Tecnico, preghiamo di voler compilare il presente modulo in tutte le sue parti e spedirlo all’indirizzo sopra indicato. Si ringrazia 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: 

AGUSTAWESTLAND S.p.A. 

CUSTOMER SUPPORT & SERVICES - ITALY

PRODUCT SUPPORT ENGINEERING DPT.

Via del Gregge, 100

21015 Lonate Pozzolo (VA) - ITALY 

Tel.: +39 0331 664905

Fax: +39 0331 664684

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.