## BOLLETTINO TECNICO N° 

# 139-126

The technical content of this document is approved under the authority of DOA nr. EASA.21J.005 DATE June 20, 2008

REV. /

Compliance with this bulletin is:

Page 1 of 5 SUBJECT: WIRE STRIKE PROTECTION SYSTEM (WSPS) TOP CABLE CUTTER
ASSY P/N 423-83001-1 REWORK

REASON: to rework WSPS Top Cable Cutter Assy P/N 423-83001-1.

HELICOPTERS AFFECTED: AB139/AW139 helicopters equipped with WSPS P/N
4G9540F00211 and P/N 4G 9540F00311 from S/N 31005 up to S/N 31131 (except S/N 31007) and from S/N 41001 up to S/N 41013 (except S/N 41012).

COMPLIANCE: within 200 flight hours from receipt of this Bollettino.

NOTE
If this Bollettino is not accomplished within the required compliance, WSPS Upper Installation P/N
4G9540A00111 must be remove d from the helicopter to continue flight operati ons until replacement of the Top Cable Cutter assy with a new or reworked one. See the following referenced AMP Data Modules to remove WSPS Upper Installation P/N
4G9540A00111:

## B.T. 139-126

Page 2 of 5 39-A-25-68-03-00A-520A-K Left strut aft fitting – Remove procedures 39-A-25-68-04-00A-520A-K Right strut aft fitting – Remove procedures
39-A-25-68-09-00A-520A-K Cross bar – Remove procedures

DESCRIPTION: provide instructions to rework and shorten the WSPS Top Cable Cutter Assy P/N 423-83001-1, in order to increase the clearance between the WSPS and the
main rotor blades.

REQUIRED MANPOWER: it is estimated that in order to accomplish this Bollettino three (3) man-hours are necessary.

WARRANTY: N.A.

REQUIRED MATERIALS: the following consumable materials are required for compliance with this Bollettino:

SPEC./AW Code Number DESCRIPTION Q.TY NOTE MIL-DTL-81706, Cl. 1A, Form. I cod. 81110514 Chemical conversion coating KP-XPF-1 (C061) AR Local supply

SPECIAL TOOLS: N.A.

WEIGHT AND BALANCE CHANGES: N.A.

REFERENCES:
9 AW139 Aircraft Maintenance Publication (AMP)
9 AW139 Aircraft Structural Repair Publication (ASRP)
9 AW139 Material Data Information (AMDI)

## B.T. 139-126

Page 3 of 5 PUBLICATIONS AFFECTED:
9 AW139 Illustrated Parts Data (IPD)

COMPLIANCE INSTRUCTIONS:

1. Prepare the helicopter for a safe ground ma intenance. Disconnect the battery and all the electrical power sources and/or the exter nal power supply. Refer to AMP, see data
module n° 39-A-00-20 -00-00A-120A-A.

2. Remove the top cable cutter P/N 423-83001- 1. Refer to AMP, see data module n° 39-
A-25-68-06-00A-520A-K.

WARNING
OPERATIONS DESCRIBED AT STEP 3 MUST BE
EXECUTED ONLY BY SKILLED STRUCTURAL OR
MECHANICAL TECHNICIANS.

3. In accordance with figure 1, rework t op cable cutter P/N 423-83001-1 as follows:

3.1 Put the top cable cutter P/N 423-83001-1 on an applicable work bench.

NOTE
Tolerances of ± 0.7 mm are allowed for all measurements indicated in Figure 1 (i.e. cut lines, reference lines, diameters).

NOTE The use of a local manufactured template to facilitate the operations (cut and hol e location) is allowed.
3.2 Trim the top cable cutter edge as shown in detail A.

3.3 Perform a hole (nominal dia 4.8 mm) in the position indicated on Detail A.

3.4 Protect the cut area wit h primer KP-XPF-1 (C061). Refer to ASRP (see DM n° 39-A-51-61-03-00A-084A-A) fo r material application.

## B.T. 139-126

Page 4 of 5 3.5 Restore paint as required.

3.6 Mark BT 139-126 Rev./ on the reworked top cable cutter in a visible and permanent way.

NOTE Top Cable Cutter for spare par ts or new build aircraft is identified by P/N 3G9506P01431.

4. Install the top cable cutter reworked at step 3. Refer to AMP, see data module n° 39-
A-25-68-06-00A-720A-K.

5. Return helicopter to flight configuration and record for compliance of this Bollettino.

## B.T. 139-126

Page 5 of 5 Figure 1NOTE:TOLERANCES OF±0.7 MM AREALLOWED FOR ALL MEASUREMENTSNote: 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.**
PRODUCT SUPPORT ITALY Via per Torna v en t o, 15 21019 Som m a Lombardo (VA) - I T ALY T el

. : +39 0331 711100 Fa x : +39 0331 711 180

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.