# XX

TRANSLATION OF



## BOLLETTINO TECNICO N° 

# 109EP-98

The technical content of this document is approved

under the authority of DOA nr EASA.21J.005. DATE June 22, 2009

REV. xxxxxxx

Compliance with
this bollettino is:



# XX Page 1 of 7 SUBJECT: MODIFICATION OF THE “ BATT BUS” CIRCUIT BREAKER
INSTALLATION.

REASON: Modify the fuselage electrical installation P/N 109-0741-49 and the overhead panel electrical installati on P/N 109-0741-55, by means of the
“BATT BUS” circuit breaker modification kit P/N 109-0824-73-101.

HELICOPTERS AFFECTED: All Agusta A109E helic opters as given below:

• up to S/N 11077 included, that install kit P/ N 109-0812-04-101 or -103, or -107, or -109;

• from S/N 11078 to S/N 11758 incl uded, except t he S/N 11741, 11754
and 11757.

COMPLIANCE: Within and not later than 50 (fifty) f light hours after the receipt of this
Bollettino and however within and not later than December 31, 2009.

DESCRIPTION: During investigations conducted by Agusta on the electrical power generation system of the A1 09E helicopter, it has been discovered that the 35 Amps “BATT BUS” Circuit Breaker characteristics resulted not within design requirements. In the event of a doub le electrical failure involving, at least, one of the generators, “BATT BU S” 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 t he purpose to provide the necessary instructions to apply the “BATT BUS” circuit breaker modi fication kit P/N 109-0824-73-101, for the replacement of the 35 Amps circuit breaker with a 50 Amps circuit breaker and the replac ement of the wires with oversized

ones.B.T.109EP-98

Page 2 of 7 REQUIRE D MANPOWER:
An estimat ed 5 (five) manpower hours ar e r equired for complianc e 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, exc ept the consumable materials. Upon application of t h is Bollettino, Customers are requested t o submit t o Agusta W a rranty Administration the Technical Bulletin Compliance form attached to this Bollettino duly completed in all its parts.

REQUIRE D MATERI ALS: The following materials are required for compliance wit h this Bollettino:

P/N DENOMINATION Q.TY
109-0824-73-101 “BATT BUS” circuit breaker 1
modification kit consisting of: A583A2610W Stowage c ap .4
MS21042- L4 Nut .1
MS25244- 50

or 30-072-1 50A circuit breaker .1

or 700-001-50
AN4-3A Bolt .1
MS51957- 26 Screw .2
MS51957- 27 Screw .2
MS51957- 28 Screw .2
MS51957- 29 Screw .2
MS51957- 30 Screw .2
NAS1149D0416H Washer .2
999-8001-74-211 Busbar .1
109-0824-73-105 Cable assy .1

In addition the following consumable material is necess a ry:

SPE CIFICATION DENOMINATION Q.TY
MIL-T-43435 Lacing cor d A.R. (code 900004953)

SPECIAL TOOLS:
N. A.

WEIGHT AND BAL ANCE CHANGES: Negligible.

REFE RE NCES:
A109E Maintenance Manual.B.T.109EP-98

Page 3 of 7 PUBLICATIONS AFFECTED: A109E Maintenance Manual; A109E Illustrated Parts Catalog up to S/N 11600; A109E Illustrated Parts Catalog S/N 11601 and subs.

COMPLIANCE INSTRUCTIONS: (See figures 1÷2)

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

2. Acting on the relevant fixing hardw are remove the glareshield, the instruments panel central fairing, the right side door P/N 109-0312-95 and, if installed, the instruments panel lower covers, located behind the pilot pedals.

3. With reference to figure 1 detail A, behind the pilot pedals identify the 35 Amps “BATT BUS” circuit breaker.

4. Acting on the releva nt fixing hardware remove the circuit breaker support.

5. Electrically disconnect and remo ve from the support the 35 Amps
“BATT BUS” circuit breaker.

6. With reference to figure 1 det ail A and figure 2 wiring, diagram
disconnect and remove the wire ma rked P140A10 from pin A1 of the K7201 battery relay.

NOTE As an alternative it is possible to stow the wire after the installation of two stowage caps P/N
A583A2610W.

7. With reference to figure 1 detail A and figure 2 wiring diagram, connect the wire marked P140A8 to pin A1 of the K7201 battery relay.

8. With reference to figure 1 deta il A and figure 2 wiring diagram, on 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 install it on the support.

9. Open the overhead panel and with reference to figure 2 detail B, identify the busbar P/N 109-0745- 03-137 (or 999-8001-74-211 if already installed) of the “DAU CH-A” and “EDU 1” circuit breakers.B.T.109EP-98

Page 4 of 7 10. With reference to figure 2 deta il B and figure 2 wiring diagram, from
the busbar P/N 109-0745-03-137 (or 999-8001-74-211 if already installed) disconnect the wire marked P140B10.

11. From the overhead panel, if the busbar P/N 999-8001-74-211 is not already installed, acti ng on the relevant fixi ng hardware remove the
busbar P/N 109-0745-03-137.

12. With reference to figures 1 and 2, remove the wire marked P140B10.

NOTE As an alternative it is possible to stow the wire after the installation of two stowage caps P/N
A583A2610W.

13. With reference to figure 2 deta il B and figure 2 wiring diagram, in the overhead panel (if no already insta lled) install the busbar P/N 999- 8001-74-211 using the previously removed fixing hardware.

NOTE If necessary, replace the “DAU CH-A” and “EDU 1” circuit breaker screws, with screws
selected from P/N MS51957-26 to P/N MS51957-30 of adequate length.

14. With reference to figures 1 and 2, route the wire marked P140B8
from the busbar P/N 999-8001-74-211, located inside the overhead panel, to the circuit breaker P/ N MS25244-50, behind the pilot pedals, following the ex isting harness routing.

NOTE To facilitate the operation from the instruments panel remove the instruments and/or the panels involved in the wire route.

15. With reference to figure 2 detail B and figure 2 wiring diagram,
connect the wire marked P140B8 to the busbar P/N 999-8001-74- 211 using a bolt P/N AN4-3A, tw o washers P/N NAS1149D0416J
and a nut P/N MS21042-L4.

16. With reference to figure 1 detail A and figure 2 wiring diagram,
connect the wire marked P140B8 to the circuit breaker P/N
MS25244-50 or P/N 30-072-1 or P/N 700-001-50 (50 Amps).

17. Reinstall the circuit breaker su pport using the previously removed fixing hardware.B.T.109EP-98

Page 5 of 7 18. Secure the wires marked P140 A8 and P140B8 to the existing harness using MIL-T-43435 lacing cord.

19. Close the overhead panel and re install the glareshield, the instruments panel central fairing, the right side door P/N 109-0312-95 and, if installed, the instruments panel lower covers, located behind the pilot pedals using the previously removed fixing hardware.

20. Perform the following checks:

NOTE During execution of the following checks, each
time the MASTER CAUTION and/or MASTER
WARNING lights illuminate, reset them by pressing relative pushbutton.

20.1 Ensure that all circuit breaker s of overhead panel are open and all
switches are set to “OFF” or “NORMAL”.

20.2 Ensure that the circuit breaker s “BATT RELAY” and “BATT BUS” are
closed.

20.3 Connect a suitable external electr ical power source in accordance with instructions given in the A109E Maint enance Manual.

20.4 Close the circuit breaker “EDU 1” and check that the EDU 1 is powered.

20.5 Close the circuit breaker “DAU CH A” and check that on the EDU 1 the parameters are in COMPOSITE mode.

20.6 Close the circuit breaker “INT ERCOM PLT” and check operation of
the ICS 1.

20.7 Disconnect the external electric al power supply in accordance with instructions given in the A109E Maintenance Manual.

20.8 Restore the initial conditions.

21. Return the helicopter to a ready to flight condition.

22. Record compliance with this Bollettino in the helicopter log book.B.T.109EP-98

Page 6 of 7 

## FIGURE 1B.T.109EP-98

Page 7 of 7 

## FIGURE 2Note:

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 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.