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 4G9540F00311 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 removed from the helicopter 

to continue flight operations 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 maintenance. Disconnect the battery and all 

the electrical power sources and/or the external 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 top 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 hole 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 with primer KP-XPF-1 (C061). Refer to ASRP (see DM n° 

39-A-51-61-03-00A-084A-A) for material application. 
B.T. 139-126 

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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 parts 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 1 

NOTE: TOLERANCES OF 

± 0.7 MM ARE 

ALLOWED FOR ALL MEASUREMENTS 

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. 

PRODUCT SUPPORT ITALY 

Via per Tornavento, 15 

21019 Somma Lombardo (VA) - ITALY 

Tel.: +39 0331 711100 

Fax: +39 0331 711180

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.