Page 1 of 7



### BOLLETTINO TECNICO

The technical content of this document is approved under the authority of DOA nr. EASA.21J.005. N° 

# 412
- 134

DATE July 15 , 20 13

REV.

Compliance with this bulletin is:

SUBJECT: SWASHPLATE OUTER RING ASSEMBLY P/ N 412

- 010

- 407

- 105,

R EMOVAL FROM SERVICE

.

REASON: Remove from service the subject swashplate outer ring assembly.

HELICOPTERS AFFECTED:

COMPLIANCE:
Within the next 5 flight hours after the issue of t his Bollettino and subsequently every 25 flight hours until removal from service, which as to be done within 300 flight hours after the
issue of this Bollettino or no t later than April 1 5 , 201 4 whichever comes first

. The swashplate outer ring s assembly P/N 412

- 010

- 407

- 105 must n ot be used after April 15, 2014; the swashplate outer ring assembly P/N 412

- 010

- 407

- 117 must to be installed in lieu of swashplate outer ring assembly P/N 412

- 010

- 407

- 105.

DESCRIPTION: AgustaWestland has received two reports of crac king in the swashplate outer ring assemblies
P/N 412

- 010

- 407

- 105. The investigations have identified in both case a fatigue failure,

t herefore t his Bollettino mandates the removal from service of all swashplate outer ring assembly P/N 412

- 010

- 407

- 105.B.T. 412-134

Page 2 of 7 MANPOWER REQUIRED: Approximately 26 man-hours are required to complete this Bollettino.

WARRANTY: Owners / Operators of AgustaWestland AB412 who comply with the instructions of this Bollettino will be eligible to receive a pro-rated credit for the replacement swashplate outer ring assembly P/N 412-010-407-117, and cap P/N 540-011-434-111 outlined under the requirement material section of this Bollettino, together with the labor cost to cover the replacement on bench and on the aircraft.
To receive this credi t: Purchase the required 412-010-407-117 outer ring assembly and cap 540-011-434-111 from a AgustaWestland supply source. Comply with the instructions contained in this Bollettino no later than the applicable hours in the “compliance section” of this Bolle ttino, or before April 15, 2014. Labor cost provided for a replacement an on bench assembly will be $400.00 USD and $800.00 USD for an on aircraft assembly. Submit an WMM to the AgustaWestland Warranty Department for the replacement parts and the appropriate labor cost.

MATERIAL REQUIRED: The following material is required for the accomplishment of this Bollettino.

P/N DENOMINA TION Q.TY

412

- 010

- 407

- 117 Outer ring assembly 1

412

- 010

- 404

- 101 Shim 1

204

- 011

- 429

- 1 Seal 2

540

- 011

- 434

- 111 Cap assembly 1

140

- 007

- 21S18C6 Washer 1 4

MS21042L5 Nut 16B.T. 412

- 134

Page 3 of 7 MS21250

- 05022
o r NAS625

- 22 B olt 1 4

AN960

- 516
o r NAS1149F0563P Washer 16

SPECIAL TOOLS: N.A.

WEIGHT AND BALANCE CHANGE: N.A.

REFERENCES:
AB412

- IPC Illustrated Parts Catalogue
BHT

- 412

- CR&O Component Repair and Overhaul Manual
AB412

- MM Maintenance Manual

PUBBLICATIONS AFFECTED:
AB412

- MPM Maintenance Planning Manual Chapter 4
AB412

- IPC Illustrated Parts Catalogue

ACCOMPLISHMENT INSTRUCTIONS:
1. Prepare helicopter for safe ground maintenance. Disconnec t battery and all the electric power source and/or the external power supply.
2. Remove forward pylon f a iring assembly in accordance with AB412

- MM , and c lean swashplate outer ring with clean cloth damp in denatured alcohol or equivalent.
3. Using a 5X magnifying glass and a bright light visually inspect the swashplate outer ring P/N
412

- 010

- 407

- 105 for cracks ( Ref er to F igure 1 and Figure 2 for typical crack found during inspection ).
4. If the inspection does not reveal cracks, re

- install forward pylon firing assemb ly previously
removed and return the helicopter to flight configuration

. M ake an entry in helicopter applicable documentations indicating compliance of the inspection with this Bollettino

. 5. If the inspection reveal cracks , remove and replace the swashplate outer ring assembly P/N
412

- 010

- 407

- 105 with P/N 412

- 010

- 407

- 117 in accordance with the following instructions : 5.1. Remove swashplate and support assemb ly in accordance with AB412

- MM Chapter 62

- 31

-B.T. 412-134

Page 4 of 7 02 step 2.5.2 Disassembly swashplate and support assy for enter to outer ring in accordance with BHT412-CR&O Chapter 62-00-00 paragraph 62-30. Scrap outer ring P/N 412-010-407-105, shim P/N 540-011-436-3, seals P/N 204-011-429-1 and cap assy P/N 540-011-434-1. 5.3 Install seals P/N 204-011-429-1 in new outer ring P/N 412-010-407-117 and cap P/N 540- 011-434-111 (lip pointing downward) in accordance with BHT-412- CR& O paragraph 62- 36 step 2. 5.4 Reassemble swashplate and support assy in accordance with BHT-412-CR&O Chapter 62- 00-00 paragraph 62-36 using new shim P/N 412-010-404-101 an hardware listed in Figure 3. Remark with P/N 412-010-402-111 the swashplate and support assy. 5.5 Re-install the swashplate and support assembly in accordance with AB412-MM Chapter 62- 31-02 step 3.
6. After re-assembly and installation of all components, the main rotor assembly shall be
tracked and balanced in accordance with AB412-MM Maintenance Manual.
7. Upon completion, make an entry in helicopter applicable documentations indicating compliance with this Bollettino.B.T. 412

- 134

Page 5 of 7 Figure 1 Swashplate outer ring
, area to be inspected all aroundB.T. 412-134

Page 6 of 7 Figure 2 Crack on s washplate outer ring P/N 412

- 01 0

- 407

- 105B.T. 412

- 134

Page 7 of 7 Figure 3 DENOMINATION PRE B.T. POST B.T.

Ref. P/N Ref. P/N Outer Ring Assy 1 412

- 010

- 407

- 105 1A 412

- 010

- 407

- 117 Shim 2 540

- 011

- 436

- 3 2A 412

- 010

- 404

- 101 Seal 3 204

- 011

- 429

- 1 3 204

- 011

- 429

- 1 Cap Ass y 4 540

- 011

- 434

- 1 4A 540

- 011

- 434

- 111 Washer 5 140

- 007

- 21S18C6 5A 140

- 007

- 21S18C6 Nut 6 MS21042L5 6A MS21042L5

Bolt 7 MS21250

- 05022
or NAS625

- 22 7A MS21250

- 05022
or NAS625

- 22

Washer 8 AN960

- 516
or NAS1149F0563P 8A AN960

- 516
or NAS1149F056 3PNote: 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.