ALERT

BOLLETTINO TECNICO N° 139-265 

The technical content of this document is approved 

under the authority of DOA nr. EASA.21J.005 DATE August 25, 2011

REV. /

Compliance with

this bulletin is: 

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

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

Page 1 of 7

SUBJECT: PRECAUTIONARY INSPECTION AND QUARANTINE OF TAIL ROTOR 

BLADES

REASON: to introduce a precautionary inspection and quarantine on tail rotor blades.

NOTE

This Bollettino supersedes BT no. 139-251

HELICOPTERS AFFECTED:

Part I: All AB139/AW139 helicopters equipped with tail rotor blades P/N 

3G6410A00131 or P/N 4G6410A00131.

Part II: All AB139/AW139 helicopters equipped with tail rotor blades P/N 

3G6410A00131 or P/N 4G6410A00131, having logged more than 600 flying 

hours or more than 1500 landings whichever occurs first.

NOTE

Both parts have to be extended to all the stored tail 

rotor blades P/N 3G6410A00131 and 

4G6410A00131.

MANDATORY

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

If owner ship of air c raft has changed, please, forward to new owner.

An Company

Via Giovanni Agusta, 520

21017 Cascina Costa di Samarate (VA) Italy

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

ALERT

ALERT
B.T. 139-265

Page 2 of 7

COMPLIANCE:

Part I: within 25 flight hours from receipt of this Bollettino and then every 25 flight 

hours after first compliance with PART I.

Part II: within five (5) flight hours or thirthy (30) days from the receipt of this 

Bollettino, whichever comes first.

NOTE

If the number of landings applicable to each single 

blade is not known throughout the entire service life 

of the blade, the number of landings shall be 

calculated multiplying the blade flight hours by a 

factor of 4 (four).

Example:

0-150 FH: landings unknown

150-450 FH: accumulated landings 550, based on

helicopter logbook

Total landings = 150*4 + 550 = 1150

Remaining landings = 1500 – 1150 = 350 landings

DESCRIPTION: as a result of the first available information of the AW139 event in 

Brazil, while the investigation is ongoing and waiting for additional 

information/analysis, as a precautionary measure this Bollettino prescribes 

inspection and quarantine of the tail rotor blades meeting the criteria reported in the 

above paragraph.

In the meantime collection of all necessary evidence is going on in order to isolate 

the root cause and determine the final corrective actions.

REQUIRED MANPOWER: it is estimated that in order to accomplish this Bollettino the 

following man-hours (MMH) are necessary:

Part I: one (1) MMH;

Part II: one (1) MMH.
B.T. 139-265

Page 3 of 7

Man-hours are based on hands-on time and may vary with personnel and facilities

available.

WARRANTY: N.A.

REQUIRED MATERIALS: N.A.

SPECIAL TOOLS: the following special tools are necessary to accomplish this 

bollettino:

P/N DESCRIPTION Q.TY

2004-5007-A Platform, right (GG-02-00) or approved alternative 1

Local supply Magnifying glass (at least 5 X) 1

Local supply Hand torch 1

Local supply Mirror 1

Local supply Borescope AR

WEIGHT AND BALANCE CHANGES: N.A.

REFERENCES:

 AW139 Aircraft Maintenance Publication (AMP)

PUBLICATIONS AFFECTED: N.A.
B.T. 139-265

Page 4 of 7

COMPLIANCE INSTRUCTIONS:

Part I

1. Prepare the helicopter for safe ground maintenance. Disconnect the battery and all

the electrical power sources and/or the external power supply.

2. Get access to the tail rotor and select the first affected tail rotor blade to start the

inspection.

CAUTION

Refer to figure 2 for typical appearance of the area to

be inspected.

3. With reference to Figure 1 and 2, perform a visual inspection of highlighted areas 

using mirror, magnifying glass and a hand torch. Make sure that there are no cracks 

or signs of damage.

NOTE

Use of the borescope can help in performing the

visual inspection.

4. If you find any cracks or signs of damage, contact Product Support Engineering 

(FOC-SE.mbx@agustawestland.com) for further actions to be performed, providing 

details of the findings and the following data: helicopter S/N and total time, tail rotor 

blade P/N, S/N, total time since new and landings. Any blade removed from service 

has to be sent to Agusta for investigation

5. Record for compliance with Part I of this bollettino on the component logcard.

6. Repeat steps 3 thru 5 on the remaining tail rotor blades installed on the helicopter

affected by Part I of this Bollettino.

7. Fill Technical Bulletin Compliance Form and return it to Product Support Engineering 

(FOC-SE.mbx@agustawestland.com).
B.T. 139-265

Page 5 of 7

Part II:

1. Prepare the helicopter for safe ground maintenance. Disconnect the battery and all 

the electrical power sources and/or the external power supply.

2. Get access to the tail rotor and remove the tail rotor blades P/N 3G6410A00131 or 

P/N 4G6410A00131 having logged more than 600 flying hours or more than 1500

landings whichever occurs first. Refer to AMP, see DM n° 39-A-64-11-01-00A-520AA or n° 39-B-64-11-01-00A-520A-A for the remove procedures.

3. Quarantine the removed tail rotor blades at step 2 in an appropriate segregated 

area, and contact Product Support Engineering (FOCSE.mbx@agustawestland.com) for further instruction, providing the following details 

of the removed tail rotor blades: helicopter S/N and total time , tail rotor blade P/N, 

S/N and total time since new and landings.

4. In order to install replacement blades refer to AMP, see DM n° 39-A-64-11-01-00A720A-A or n° 39-B-64-11-01-00A-720A-A.

NOTE

After blade replacement, we remind you to perform 

Track & Balance of tail rotor according to DM n° 39-

A-18-10-02-00A-376A-A (Tail rotor – Blade track and 

balance check), as prescribed by DM n° 39-A-64-11-

01-00A-720A-A and n° 39-B-64-11-01-00A-720A-A.

5. Record for compliance with this bollettino on the component logcard.

6. Fill Technical Bulletin Compliance Form and return it to Product Support Engineering 

(FOC-SE.mbx@agustawestland.com).
B.T. 139-265

Page 6 of 7

Area to be inspected

Figure 1
B.T. 139-265

Page 7 of 7

Figure 2

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: 

AGUSTA S.p.A. 

CUSTOMER SUPPORT & SERVICES - ITALY

PRODUCT SUPPORT ENGINEERING DPT.

Via del Gregge, 100

21015 Lonate Pozzolo (VA) - ITALY 

Tel.: +39 0331 664600

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.