## BOLLETTINO TECNICO N° 

# 139 -404

The technical content of this document is approved under the authority of DOA nr. EASA.21J.005 DATE Decembe r 22 , 2014

REV . /

Compliance with this bulletin is:

Page 1 of 14 SUBJECT FULL ICE PROTECTION SYSTEM (FIPS) TAIL ROTOR (TR) SLIP RING

REASON T o inspect and replace TR slip ring screws and to confirm the correct lockwiring.

HELICOPTERS AFFECTED All the TR slip ring P/ N 4G6420V00151, P/ N 4G6420V00152 and P/ N 4G6420V00153 b oth installed on AW139 helicopters and kept in stock

. NOTE Helicopters installing one of the Kits Partial Removal Arrangement (P/N from 4G3000F00311 to 4G3000F00319) are also affected by this Bollettino Tecnico. NOTE TR slip rings having letter “ T ” marked after the S/N or “MOD 1” marked in the MFG plate are already compliant with this Bollettino Tecnico and do not need to be inspected. Refer to figure 1 for possible markings location.

## B.T. 139 - 404

Page 2 of 1 4 COMPLIANCE W ithin thirty ( 30 ) flight hours or one ( 1 ) month from receipt of this B ollettino Tecnico , whichever comes first.

DESCRIPTION An in service occurrence leading a separation between the slip ring body and the supporting ring have been forced to be due to a non conformity of the mounting screws installation

. The intent o f this Bollettino Tecnico is to confirm absence of additional non conformities on parts already delivered. Follow on actions may be expected at the conclusion of the investigation.

REQUIRED MANPOWER I t is estimated th at in order to accomplish this Bolletti no Tecnico t hree ( 3 ) maintenance
man - hours (MMH) are necessary. Man

- hours are based on hands

- on time and may vary with personnel and facilities available.

WARRANTY

 Owners/Operators who comply with the instructions of this Bollettino Tecnico no later than t he applicable date in the “Compliance section” will be eligible to receive necessary parts on a free of charge basis, with the exception of Special Tools. NOTE: Customers who fail to comply with the instructions in this Bollettino Tecnico before the compli ance date are not eligible for the aforementioned special policy.

 Please Issue relevant M.M.I.R. form ( Maintenance Malfunction Information Report ) to your Warranty Administration Dpt.; in case TAIL ROTOR SLIP RING HAS TO BE REPLACED AND RETURNED, PLEASE PROCEED WITH ITS SHIPMENT WITHIN 7 DAYS FROM THE RECEIPT OF RELEVANT Return Material Authorizati on (RMA).

## B.T. 139 - 404

Page 3 of 1 4 REQUIRED MATERIALS Refer to Moog Service Bulletin SB 14

- 02 in annex A for the materials required to comply with this Bollettino Tecnico : NOTE

A Tail Rotor Slip Ring P/N 4G6420V0153 can be ordered to AgustaWestland in case the part affected by this Bollettino Tecnico failed the check

.

Applicability Note

 For three digit S/N xxx()() (i.e. 051()()), items listed in SB 14

- 02 table 2 (this materials could be included in the kit P/N JJ6828KIT1)

.

 For four digit S/N yyyy()() (i.e.1001()()), items listed in SB 14

- 02 table 3 (this materials could be included in the kit P/N JJ6828KIT2)

. (1) (5)
(2) (5)

Moreover, the following consumable materials, or equivalent, are necessary to accomplis h this Bollettino Tecnico :

SPEC./AW Code Number DESCRIPTION Q.TY NOTE ASTM Specification D5363

- 03 Two part thread locking epoxy, Armstrong C7/W or equivalent AR Local supply ( 3 )
MIL

- L

- 19537C Acrylic Lacquer (C081) AR Local supply

SPECIAL TOOLS T he follo wing special tools, or equivalent, are required for compliance with this Bollettino Tecnico: SPEC./AW Code Number DESCRIPTION Q.TY NOTE RMGE

- DS

- 06

- 2010

- RH or approved alternative Platform, right (GG

- 02

- 00) AR ( 4 )

Commercial Permanent black ink felt pen A R Local supply

## B.T. 139 - 404

Page 4 of 1 4 SPEC./AW Code Number DESCRIPTION Q.TY NOTE / Mirror AR Local supply / Hand torch AR Local supply / Torque wrench AR Local supply

Notes (1) Screw P/N NAS1352N06H12 may be used as an alternative to P/N NAS1352N06

- 12. (2) Screw P/N NAS1352N06H14 m ay be used as an alternative to P/N NAS1352N06

- 14. (3) Loctite 242/MS (blue), Loctite 243 (blue) and Lo ctite 270 (green) may be used as an alternative. (4) Refer to Illustrated Tools and Equipment Publication (ITEP) . See DM n° 39

- A

- GG

02

- 00

- 00A

- 066A

- A. (5) Item 3 is l ocal supply also.

WEIGHT AND BALANCE CHANGES N.A.

REFERENCES  AW139 Aircr aft Material Data Information (AMDI )  AW139 Aircraft Maintenance Publication (AMP)  AW139 Illu strated Tools and Equipment Pub lication (ITEP)

PUBLICATIONS AFFECTED N.A.

## B.T. 139 - 404

Page 5 of 1 4 COMPLIANCE INSTRU CTIONS
1. Prepare the helicopter for a safe ground maintenance. Disconnect the battery and all the electrical power sources and/or the external power supply. Refer to AMP, see DM n° 39

- A

- 00

- 20

- 00

- 00A

- 120A

- A. 2. Put the platform (GG

- 02

- 00), or an approved alterna tive, adjacent to the right side of the fuselage. 3. Remove the access panels 360AT and 360CT

. Refer to AMP, see DM n° 39

- A

- 06

- 41

- 00

- 00A

- 010A

- A

. NOTE

Inspection described in Moog Service Bulletin SB 14

- 02 can be performed on wing. If necessary, use mirror and torch to inspect holes as requested in step 6 of Moog Service Bulletin SB 14

- 02 compliance instructions. 4. Perform the inspection and replacement of the mounting screws and re

- install the lockwire according to Moog Service Bulletin SB 14

- 02 in annex A. If t he test fails, return the slip ring to AgustaWestland and replace it with a new one, according to AMP DM n° 39

- B

- 64

- 21

- 05

- 00A

- 520A

- A and DM n° 39

- B

- 64

- 21

- 05

- 00A

- 720A

- A. 5. Mark on the identification plate the letter “T” after the serial number of the unit by means of permanent black ink felt pen and apply acrylic lacquer (C081). 6. Install the access panels 360AT and 360CT removed at step 3. 7. Remove the platform (GG

- 02

- 00) from the right side of the fuselage

. 8. Return the helicopter to flight configuration and recor d for compliance with this Bollettino Tecnico on the helicopter logbook

. 9. Record for compliance with this Bollettino Tecnico and update the slip ring S/N on the component logcard

.

## B.T. 139 - 404

Page 6 of 1 4 Figure 1

## B.T. 139 - 404

Page 7 of 1 4 

# Annex A

MOOG Service Bulletin SB 14 - 02 Rev. DNote: 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.