# 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 p art s have to be extended to all the stored tail
rotor blades P/N 3G6410A00131 and
4G6410A00131.

## B.T. 139

- 2 6 5

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: w ithin five (5 ) flight hours or thirthy (30) days from the r eceipt of this
Bollettino
, w h i c h ever 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: a s 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 nec essary 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

- 2 6 5

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

- 2 6 5

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, to tal 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 t his bollettino on the component logcard.

6. Repeat steps 3 thru 5 on the remaining tail rotor blades in stalled 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

- 2 6 5

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 6 00 flying hours or more than 15 00 landings which ever occurs first . Refer to AMP, se e DM n° 39

- A

- 64

- 11

- 01

- 00A

- 520A

A 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 segrega ted area, and contact Product Support Engineering ( FOC

SE.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

- 00A

7 20A

- 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

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Page 6 of 7 Area to be inspected

Figure 1

## B.T. 139

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Page 7 of 7 Figure 2Note: 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 **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 664600 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.