# ALERTX

TRANSLATION OF 

## BOLLETTINO TECNICO N° 

# 1 09 -132

The technical content of this document is approved under the authority of DOA nr EASA.21J.005. DATE October 22 , 20 10

REV. xxxxxxx

Compliance with this bollettino is:



# ALERT Page 1 of 7 SUBJECT: TAIL ROTOR HUB AND BLADES INSTALLATION SPECIAL HUB PLUG

P/N 109

- 0133

- 18

- 103, INSPECTION OF

.
REASON: Perform a one

- time inspection of the subject special hub plug to verify

the application of the right tightening torque value and provide the inst ructions to restore the correct installation

.
HELICOPTERS AFFECTED:

All the Agusta A1 09A and A109AII helicopters that have performed the special hub plug P/N 109

- 0133

- 18

- 103 tightening in accordance with the instructions given in the A109A/AII Maintenance Manual, revision 9 dated June 15, 2009 or subsequent revisions , excep t the Temporary Revision n°65

- 4 dated September 28, 2010

.
COMPLIANCE:

Within the next 5 flight hours after the receipt of this Bollettino and however within and not later than November 30, 2010

.
DESCRIPTION:

During the installation of the tail rotor hub on an A109A series helicopter, in the publication A109A/AII Maintenance Manual has been reported a n inaccuracy in the tightening torque to apply at th e special hub plug P/N 109

- 0133

- 18

- 103. The publication A109A/AII Maintenance Manual, Chapter 65

- 20

- 00, point F, step e., for the tightening of the special hub plug P/N 109

- 0133

- 18

- 103 indicates for a torque of 57 to 67 kgcm (51 to 60 in.lb). Actually the drawing of the tail rotor installat ion requests for the hub plug a tightening torque of 600 to 700 kgcm. The investigations revealed that the mistake ha s been inserted in the maintenance manual with the revision 9 dated June 15, 2009. TheB.T. 1 09

- 132

Page 2 of 7 publication A109A/AII Maintenance Manual has been re vised with the

Temporary Revision n°65

- 4 dat ed September 28
, 2010 to introduce the right tightening torque value

. This Bollettino is issued in order to provide the necessary instructions to perform a one

- time inspection to verify the correct tightening tor que application to the special hub plug P/N 109

- 0133

- 18

- 103 and, if necessary, to restore the design conditions and the inspection of the tail rotor hub and blade assy P/N 109

- 0131

- 02 (all dashes) trunnion broaching and the tail rotor gearbox assy P/N 109

- 0440

- 01 output drive shaft broaching.

REQUIRED MANPOWER :

For compliance with this Bollettino a n estimated 2 (two) manpower hours are required in case the tightening torque value is correct

. In case the value is not correct 7 (seven) manpower hours are re quired.

WARRANTY :

Within the calendar terms mentioned at point “Compliance”, the parts required to apply the present Bollettino shall be supplied on a free of charge basis by Agusta upon Customer’s request.
Upon application of this Bollettino, Customers are requested to submit to Agusta Warranty Administration the Technical Bulletin Compliance form attached to this B u lletin duly completed in all its parts, and the relevant M.M.I.R. (Maintenance Malfun c tion Information Report).

REQUIRED MATERIALS:

The fol lowing materials are required for compliance with this Bollettino :

P/N DENOMINATION Q.T Y 109

- 0133

- 17

- 103 Lock washer 1 MS29561

- 119 O

- ring 1

SPECIAL TOOLS:

Refer to the A109A/AII Maintenance Manual

. WEIGHT AND BALANCE CHANGES:

N.A.

RE FERENCES:

A109A/AII Maintenance Manual

. PUBLICATIONS AFFECTED:

N.A

. COMPLIANCE INSTRUCTIONS:

(See figure s 1 ÷ 3 )

1. Prepare the helicopter on ground for a safe maintenance, disconnect any power supply

.B.T. 1 09

- 132

Page 3 of 7 2. Gain access to the special hub plug P/N 109

- 0133

- 18

- 103 in accord ance with the procedures given in the A109A/AII Maintenance Manual

.
3. Verify the tightening torque of the special hub plug P/N 109

- 0133

- 18

- 103 as follows :

3.1 With reference to figure 1, from the special hub plug P/N 109

- 0133

- 18

- 103 raise the winglets of the lock washer P/N 109

- 0133

- 17

- 103

.
3.2 Using a torque wrench verify that the tightening torque value of the special hub plug P/N 109

- 0133

- 18

- 103 is at least 600 kgcm.

3.3 If the tightening torque value is correct , replace the lock washer P/N 109

- 0 133

- 17

- 103 and the MS29561

- 119 o

- ring with new parts with the same P/N and complete the installation of the tail rotor system parts in accordance with the procedures given in the A109A/AII Maintenance Manual. No corrective action is required
, proceed as de scribed in steps 11 and 12.

CAUTION The special hub plug P/N 109

- 0133

- 18

- 103 must be torque up to 600 to 700 kgcm

.
3.4 If the tightening torque value is lower than the required, proceed as described in steps 4 and subsequent

.
4. Remove the tail rotor hub and b lades assy P/N 109

- 0131

- 02 (all dashes) in accordance with the procedures given in the A109A/AII Maintenance Manual

.
5. With reference to figure 2, inspect the broaching (F) and the bearing faces (D) of trunnion P/N 109

- 0131

- 05 or P/N 109

- 8131

- 33 of the tai l rotor hub and blades assy P/N 109

- 0131

- 02
, for spalling, fretting , wear and/ or other damages.

5.1 Medium

- heavy s palling on bearing faces (D) out of the limits shown in figure 2 involves the trunnion replacement with a new part with the same P/N.

5.2 S light s p alling on bearing faces (D) within the limits shown in figure 2 is acceptable and does not require rework

.
5.3 Wear s palling on the broaching (F) involves the trunnion replacement with a new part with the same P/N

.B.T. 1 09

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Page 4 of 7 5.4 Perform the dimensional check of the broach ing (F), dimension s

exciding the limits shown in figure 2 involves the trunnion replacement with a new part with the same P/N

.
5.5 With reference to figure 1, i nspect the special hub plug P/N 109

- 0133

- 18

- 103, the spacer P/N 109

- 0133

- 16

- 103, the spacer P/N 10 9

- 0130

- 89

- 1 and the static stop P/N 109

- 0130

- 27

- 5 for damages and/or corrosion

. Presence of damages and/or corrosion involves the relevant part replacement with a new part with the same P/N

.
6. With reference to figure 3, inspect the broaching (H) of the o utput drive shaft P/N 109

- 0445

- 08

- 3/

- 7 of the tail rotor gearbox assy P/N 109

- 0440

- 01 for fretting , wear and/ or other damages.

6.1 Fretting presence could not be acceptable

. Conta ct Agusta.

6.2 Other damages presence is not acceptable . Conta ct Agusta.

6.3 Da mages o f 0.07 mm or more in depth between loaded and not loaded are as are not acceptable

. Conta ct Agusta.

6.4 I nspect the output drive shaft P/N 109

- 0445

- 08

- 3/

- 7 of the tail rotor gearbox assy P/N 109

- 0440

- 01 in accordance with the procedures given in the A109A/AII Maintenance Manual

.
7. Reinstall the tail rotor hub and blades assy P/N 109

- 0131

- 02 in accordance with the procedures given in the A109A/AII Maintenance Manual

. CAUTION The special hub plug P/N 109

- 0133

- 18

- 103 must be torque up to 600 to 700 kgcm

.
8. Perform the flap axis play check in accordance with the procedures given in the A109A/AII Maintenance Manual.

9. Perform the flap hinge friction check in accordance with the procedures given in the A109A/AII Maintenance Manual.

10. Perform the tail rotor dynamic balanc e in accordance with the procedures given in the A109A/AII Maintenance Manual

.
11. Return the helicopter in ready to flight condition

.
12. Record compliance of this Bollettino in the helicopter log book

.B.T. 1 09

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Page 5 of 7 

# FIGURE 1B.T. 1 09

- 132

Page 6 of 7 

# FIGURE 2B.T. 1 09

- 132

Page 7 of 7 109

- 0445

- 08

- 3/

- 7 T/R GEARBOX OUTPUT DEIVE SHAFT



# FIGURE 3Note: 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.