ALERT TELEX- EUROCOPTER- ALERT TELEX- EUROCOPTER- ALERT TELEX- EUROCOPTE R 

T.F.S. No.00000279 dated December 20, 2005 

EUROCOPTER - MARIGNANE - TLX 42506F 

ALERT TELEX 

No. 24A001 AIRCRAFT: EC130 Civil version: 84 

Corresponds to MOD 073572 

SUBJECT: ELECTRICAL POWER 

Battery Overheat Sensing Circuit Wiri ng 

1. PLANNING INFORMATION 

1.A. EFFECTIVITY 

1.A.1 . Helicopters /Installed equipment: 

Helicopters not modified per modification 073572 (battery temperature sensing wiring). 

Refer to the aircraft Certificate of Conformity (or RIC- Aircraft Individual 

Inspection Log Book) to identify embodiment of modification 073572. 

1.A.2. Non-installed equipment: Not applicable. 

1.8 . ASSOCIATED REQUIREMENTS 

Not applicable. 

1.C. REASON 

To ensure correct operation of the battery overheat sensing circuit. 

1.D. DESCRIPTION 

A malfunction was found in the battery overheat sensing circuit during a scheduled inspection. 

After having intentionally heated the temperature probe to a temperature above 71 ac, which normally 

corresponds to the temperature at which the "BATT TEMP" indicator light comes on, the indicator light 

remained off. 

Failure of the battery overheat sensing function to operate could give rise to a fire in the event of 

thermal runaway of the battery. 

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T.F . S. No.00000279 dated December 20, 2005 

EUROCOPTER - MARIGNANE - TLX 42506F 

The battery includes two temperature sensors: 

- a thermal switch connected across terminals A and B of the temperature sensor connector. This 

thermal switch closes when the temperature reaches 71 oc. - a thermistor (resistance varying according to the temperature) connected across terminals C and D 

of the temperature sensor connector. The resistance of the thermistor is approximately 

30,000 ohms when the temperature reaches 71 °C. 

The "BATT TEMP" indicator light comes on when the resistance in the circuit is below 200 ohms. Due 

to mistaken connection of the indicator light across thermistor terminals C and D, the indicator light 

cannot come when the temperature reaches 71 oc (the resistance is much too high). 

In order to ensure that the "BATT TEMP" indicator light comes on when the temperature reaches 

71 oc, the battery overheat sensing circuit must be connected to the thermal switch of the battery, 

across terminals A and B. 

Consequently, EUROCOPTER renders compliance with this ALERT TELEX mandatory. It stipulates 

that you must connect the temperature sensing circuit across terminals A and B instead of terminals C 

and D of the temperature sensor connector. 

1.E. COMPLIANCE 

EUROCOPTER renders compliance with this ALERT TELEX mandatory. 

1.E.1 . Compliance at the works 

1.E.1.a. On helicopters I installed equipment: Prior to delivery, comply with paragraph 2.B. 

1.E.1 .b. Non-installed equipment: Not applicable. 

1.E.2. Compliance in operation: By the operator. 

1.E.2.a. On helicopters I installed equipment: 

Comply with paragraph 2.B. within the next 110 flying hours without exceeding 1 month following 

receipt of this ALERT TELEX issued on the date indicated in the header. 

1.E.2.b. On non-installed equipment: Not applicable. 

1.F. APPROVAL 

The information or instructions relate to change: MOD No. 073572 which was approved on 

December 8, 2005 through Aircraft Modification Approval Form (FAM) No. 073572 edition 1, by the 

DGAC, in accordance with article 10.3 of EC regulation No. 159212002 

1.G. MANPOWER 

Qualification: 1 electrician . 

Time: Approximately 1 hour. 

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1.H. REFERENCES 

T.F.S. No.00000279 dated December 20, 2005 

EUROCOPTER - MARIGNANE - TLX 42506F 

Aircraft Maintenance Manual (AMM): Tasks 24-00-00, 2-1 and 24-00-00, 3-1. 

1.1. OTHER DOCUMENTS CONCERNED 

The Aircraft Maintenance Manual (AMM) and Wiring Diagrams Manual (WDM) will be updated by 

EUROCOPTER, in accordance with this ALERT TELEX. 

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T.F.S. No.00000279 dated December 20, 2005 

EUROCOPTER - MARIGNANE - TLX 42506F 

2. ACCOMPLISHMENT INSTRUCTIONS 

2.A. GENERAL 

Before you start work on the electrical system, comply with the general instructions as per 

Task 24-00-00, 3-1 . 

2.8. OPERATIONAL PROCEDURE 

2.8.1. For helicopters not modified per modification OP-3685 or 073739 (Figure 1) 

2.B.1 .a. Preliminary steps 

- Open the door to the RH side baggage hold. 

2.B.1.b. Modification to the wiring of the battery overheat sensing circuit (MOD 073572) 

- Disconnect battery temperature indicating connector 26P-P1 (a). 

- Remove connector 26P-P1 (a) (male) from its socket base (b). 

- Remove the adapter from connector 26P-P1 using a strap wrench. 

- Remove the blanking plugs from terminals A and B using an extractor. 

- Unplug the contact from terminal C and plug it in terminal B using an extractor. 

- Unplug the contact from terminal D and plug it in terminal A using an extractor. 

-Insert the blanking plugs into terminals C and D using an extractor. 

- Tighten the adapter of connector 26P-P1 using a strap wrench. 

-Secure connector 26P-P1 (a) on its socket base (b). 

- Carry out a functional test of the battery overheat sensing indicator light, as per 

paragraph 2.B.1.c. 

2.B.1.c. Check of the battery overheat sensing indicator light 

- Energize the aircraft electrical power systems as per AMM Task 24-00-00, 2-1. 

- Fit a shunt across terminals A and B of connector 26P-P1 (a) and check that the 

red "BATT TEMP" indicator light on the caution advisory panel comes on. 

- Remove the shunt and check that the indicator light goes out. 

-De-energize the aircraft electrical power systems as per AMM Task 24-00-00, 2-1 . 

- Connect battery temperature indicating connector 26P-P1 (a). 

2.B.1.d. Final steps 

- Close the door to the RH side baggage hold. 

2.8.2. For helicopters modified per modification OP-3685 or 073739 (battery installed in the tailboom) 

(Figure 2) 

2.B.2.a. Preliminary steps 

Open the tailboom hatch . 

2.B.2.b. Modification to the wiring of the battery overheat sensing circuit (MOD 073572) 

- Disconnect battery temperature indicating connector 46P-P1. 

-Remove connector 46P-P1 (a) (male) from its socket base (c). 

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T.F.S. No.00000279 dated December 20, 2005 

EUROCOPTER - MARIGNANE - TLX 42506F 

- Remove the adapter from connector 46P-P1 using a strap wrench. 

- Remove the blanking plugs from terminals A and B using an extractor. 

- Unplug the contact.from terminal C and plug it in terminal B using an extractor. 

- Unplug the contact from terminal 0 and plug it in terminal A using an extractor. 

- Insert the blanking plugs into terminals C and 0 using an extractor. 

-Tighten the adapter of connector 46P-P1 using a strap wrench. 

- Secure connector 46P-P1 (a) on its socket base (c). 

- Carry out a functional test of the battery overheat sensing indicator light as per paragraph 2.B.2.c. 

2.B.2.c. Check of the battery overheat sensing indicator light 

- Energize the aircraft electrical power systems as per AMM Task 24-00-00, 2-1 . 

- Fit a shunt across terminals A and B of connector 46P-P1 (a) and check that the 

red "BATT TEMP" indicator light on the caution advisory panel comes on. 

- Remove the shunt and check that the indicator light goes out. 

- De-energize the aircraft electrical power systems as per AMM Task 24-00-00, 2-1. 

- Connect battery temperature indicating connector 46P-P1 (a). 

2.B.2.d. Final steps 

- Close the tailboom hatch . 

2.C. IDENTIFICATION 

Record compliance with this ALERT TELEX and embodiment of modification 073572 in the aircraft 

documents. 

2.D. OPERATING AND MAINTENANCE INSTRUCTIONS 

Not applicable. 

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PRE MOD 

073572 

T.F.S. No.00000279 dated December 20 , 2005 

EUROCOPTER - MARIGNANE - TLX 42506F 

b 

,.---BA_m_Rv __ __, 26 p.p1 38DEL-..., P.f'- 2 ..,---,!'----'-J 

~ r----- - 1PW35E I:JaonE•L I : D f-----------------f 20 • • 

r-·--• I •-----~ c 1 PW36E 

21 

! ! ~---- -------- ----- --- ---;~ -y--L~ 

Figure 1: Temperature indicating connector 26P-P1 before modification OP 3685 or 073739 

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PRE MOD 

073572 

BAmRY 

r·---- "---" ' ~· --• : • _____ _: 

' I 

' 

._ ___ ·---- -- ·------ ---

.o46P 

TAILOOOM 705 

BAmRY 

,-----

POST MOD 

073572 

"---" ' r·· --• : • __ ___ _: 

' I 

T.F.S. No.00000279 dated December 20, 2005 

EUROCOPTER - MARIGNANE - TLX 42506F 

38DEL-P2 

=t 1FW42E----]Hll--1PW42F 20 ,38DEL, ~ 

1PW41E~j}--1PW41F 1 ! ! 

P1 86DEL.J1 )-,.--J TAIL BOOM HOLD 

705 695 

38DEL-P2 

=t'l---v-1 

1FW42E----]Hll--1PW42F 20 ,38DEL, 

1PW41E~j}--1PW41F 21 ! ! 

P1 86DEL.J1 rl-,..--J 

Figure 2: Temperature indicating connector 46P-P1 after modification OP 3685 or 073739 

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