# XX

TRANSLATION OF 

## BOLLETTINO TECNICO N° 

# 109S- 35

The technical content of this document is approved under the authority of DOA nr EASA.21J.005. DATE December 11 , 2009

REV. xxxxxxx

Compliance with this bollettino is:



# XX Page 1 of 8 SUBJECT: MODIFICATION OF THE “BATT BUS” CIRCUIT BREAKER

INSTALLATION.

REASON: Modify the fuselage electrical installation P/N 109-0742- 52 and the

overhead panel electrical installation P/N 109-0742-55, by means of the “BATT BUS” circuit breaker modificat ion kit P/N 109-0824- 73

- 10 7

.

HELICOPTERS AFFECTED:

All Agusta A109S helicopters up to S/N 22151 included.

COMPLIANCE:

Within and not later than 50 (fifty) flight hours after the receipt of this Bollettino and, however, not later than June 30, 20 10

.

DESCRIPTION:

During investigations conducted by Agusta on the electrical power generation system of the A109 series helicopter, it has been discovered that the 35 Amps “BATT BUS” Circuit Breaker characteristics resulted not within design requirements. In the event of a double electrical failure involving, at least, one of the generators, “BATT BUS” Circuit Breaker with degraded characteristic may result marginal in case of improper use of both landing and search lights. This Bollettino has been issued with the purpose to provide the necessary instructions to apply the “BATT BUS” circuit breaker modification kit P/N 109 -0824- 73

- 10 7, for the replacement of the 35 Amps circuit breaker with a 50 Amps circuit breaker and the replacement of the wires with oversized

o nes

.B.T.109 S

- 35

Page 2 of 8 REQUIRED MANPOWER:

An estimated of 8 ( eight ) manpower hours are required for compliance with this Bollettino.

WARRANTY:

The parts required to apply the present Bollettino shall be supplied on a free of charge basis by Agusta upon request, except t he consumable materials

. Upon application of this Bollettino, Customers are requested to submit to Agusta Warranty Administration the Technical Bulletin Compliance form attached to this Bollettino duly completed in all its parts

.
REQUIRED MATERIALS :

The f ollowing materials are required for compliance with this Bollettino:

P/N DENOMINATION Q.TY 109

- 0824

- 73

- 10 7 “BATT BUS” circuit breaker 1 modification kit consisting of: A583A2610W Stowage cap .4 CCH

- 36

- 101

- 0075 Conductive tape .1 roll MS25244

- 50

or 30

- 072

- 1 50A circuit breaker .1

or 700

- 001

- 50 109

- 0824

- 73

- 1 11 Cable assy .1
In addition the following consumable material is necessary:

SPECIFICATION DENOMINATION Q.TY MIL

- T

- 43435 Lacing cord A.R. (code 900004953)

SPECIAL TOOLS :

N. A.

WEIGHT A ND BALANCE CHANGES:

Accomplishment of this Bollettino has the following effect on weight and balance:

WEIGHT

(kg) STA

(mm) MOMENT

(kgmm) 0.605 3688 2231.2

REFERENCES :

0B

- A

- AMP

- 00

- X Maintenance Publication

.
PUBLICATIONS AFFECTED :

0B

- A

- A WDP

- 00

- X Wiring Data Publication

. 0B

- A

- IPD

- 00

- X Illustrated Parts Data Publication

.B.T.109 S

- 35

Page 3 of 8 COMPLIANCE INSTRUCTIONS:

(See figures 1 ÷3 )

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

2. In accordance with instructions given in the 0B

- A

- AMP

- 0 0

- X Maintenance Publication , gain access to the baggage compartment

, open the panel assy D19 and remove the panels P66 and P67

.
3. With reference to figure 2 view C

- C

, on STA 4910.0 bulkhead

, identify the 35 Amps “BATT BUS” circuit breaker.

4. Electrically dis connect and remove from the bulkhead the 35 Amps “BATT BUS” circuit breaker

.
5. With reference to figure 3 detail D and figure 1 wiring diagram

, disconnect and remove the wire marked P140A10 from pin A1 of the K7201 battery relay located in the baggage compa rtment

.
NOTE As an alternative

, it is possible to stow the wire provided the installation of two stowage caps P/N A583A2610W

.
6. With reference to figure 3 detail D and figure 1 wiring diagram, connect the wire marked P140A8 to pin A1 of the K7201 battery

r elay.

7. With reference to figure 2 view C

- C and figure 1 wiring diagram, to the wire marked P140A8 connect the circuit breaker P/N MS25244

- 50 or P/N 30

- 072

- 1 or P/N 700

- 001

- 50 (50 Amps) and temporary install it on STA 4910.0 bulkhead

.
8. In accordance with in structions given in the 0B

- A

- AMP

- 00

- X Maintenance Publication, remove the transmission forward fairing P15, the engine air intake D28 and the panel P46B

. 9. In accordance with instructions given in the 0B

- A

- AMP

- 00

- X Maintenance Publication

, o pen the overhead panel and with reference to figure 3 detail E , identify the bus

- bar of the “DAU CH

- A” and “EDU 1” circuit breakers.

10. With reference to figure 3 detail E and figure 1 wiring diagram, from the bus

- bar disconnect the wire marked P140B10.

11. With reference to f igure 1, remove the wire marked P140B10.B.T.109 S

- 35

Page 4 of 8 NOTE As an alternative it is possible to stow the wire provided the installation of two stowage caps P/N A583A2610W

.
12. With reference to figure 1 cable routing and relevant wiring diagram, route the wire marked P14 0B8 from the circuit breaker P/N MS25244

- 50 located on STA 4910.0 bulkhead up to the “DAU CH

- A” and “EDU 1” circuit breakers bus

- bar into the overhead panel, following the existing harness routing, through the electronic compartment, the RH upper beam, and the overhead panel

.
13. Connect the part covered with the copper braid ( between the RH upper beam outlet and the overhead panel inlet ) of the cable assy P/N 109

- 0824

- 73

- 111

, to the others braids installed on the helicopters using conductive tape P/N CCH

- 36

- 1 01

- 0075

. NOT E If installed remove and then restore the PVC

cover

.
14. With reference to figure 3 detail E and figure 1 wiring diagram, connect the wire marked P140B8 to the “DAU CH

- A” and “EDU 1” circuit breakers bus

- bar using the existing fixing hardware

.
15. With reference to figure 2 view C

- C

, from STA 4910.0 bulkhead remove the circuit breaker P/N MS25244

- 50 and in accordance with figure 1 wiring diagram connect the wire marked P140B8.

16. Definitively install the circuit breaker P/N MS25244

- 50 on STA 4910.0 bu lkhead

.
17. Secure the wires marked P140A8 and P140B8 to the existing harness using MIL

- T

- 43435 lacing cord.

18. In accordance with instructions given in the 0B

- A

- AMP

- 00

- X Maintenance Publication , close the overhead panel

, the panel assy D19, reinstall the panel s P66 and P67, the engine air intake D28 and the panel P46B (restoring the seal)

.
19. Perform the following checks:

1 9

. 1 Connect a suitable external electrical power source in accordance with instructions given in the 0B

- A

- AMP

- 00

- X Maintenance Publication

.
19.2 Ensure that the GEN BUS 1 and the GEN BUS 2 switches are OFF.

1 9

. 3 Position the INV 1 switch ON

.B.T.109 S

- 35

Page 5 of 8 19.4 Check that the Radio Master switch, on the miscellaneous panel, is ON.

19.5 Verify that the following systems are operative:

LANDING LIGHT EHSI & EADI PLT EDU 1 & EDU 2 INVERTER 1 LANDING GEAR INDICATOR FUEL PUMP 1 & 2 GPS/NAV1

1 9

. 6 Disconnect the external electrical power supply in accordance with instructions given in the 0B

- A

- AMP

- 00

- X Maintenance Publication

.
1 9

. 7 Restore the initial conditi ons.

20. Return the helicopter to a ready to flight condition

.
21. Record the accomplishment of this Bollettino in the helicopter log book

.B.T.109 S

- 35

Page 6 of 8 

## FIGURE 1B.T.109 S

- 35

Page 7 of 8 

## FIGURE 2B.T.109 S

- 35

Page 8 of 8 

## 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 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.