### ALERT TELEX- EUROCOPTER- ALERT TELEX- EUROCOPTER- ALERT TELEX- EUROCOPTER T.F.S. No.00000279 dated December 20, 2005 EUROCOPTER - MARIGNANE - TLX 42506F 

# ALERT TELEX No . 

### 24A001 AIRCRAFT: 

### EC130 Civil version : 

### 84 Co rresponds to MOD 073572 

### SUBJECT: ELECTRICAL POWER Battery Ove rheat Sensing C ircuit Wi ri ng 

### 1 . PLANNING INFORMATION 1.A. EF FE CTIVITY 1.A.1 . Helicopters /Installed equipment: Hel ico pters not mod ifi ed per modification 073572 (battery tem peratu re sensing w irin g) . Refer to the aircraft Certificate of Conformity (or RIC- Aircraft Individual Inspection Log Book) to identify embodiment ofmodification 073572 . 1.A.2. Non-instal led equipment: Not ap pl icab le . 

### 1. 8 . ASS OCIAT ED RE QUI REME NTS 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. 

### Page 1 of? ALERT TELEX- EUROCOPTER- ALERT TELEX- EUROCOPTER- ALERT TELEX- EUROCOPTER

### ALERT TELEX- EUROCOPTER- ALERT TELEX- EUROCOPTER - ALERT TELEX- EUROCOPTER 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 . Th is

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 

# o c, 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 in stead of terminal s C and D of the temperature senso r connecto r. 

### 1.E. COMPLIANCE EUROCOPTER re nd ers 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 operato r. 1 . E.2.a . On helicopters 

### I installed equipment: Comply with paragraph 2.B . within the next 110 flying hours without exceeding 1 month fol lowing 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. Page 2 of7 

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### 1 .H. REFERENCES T.F.S. No.00000279 dated December 20, 2005 EUROCOPTER - MARIGNANE - TLX 42506F
Ai rcraft 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 .



### Page 3 of7 ALERT TELEX- EUROCOPTER- ALERT TELEX- EUROCOPTER- ALERT TELEX- EUROCOPTER

### ALERT TELEX- EUROCOPTER- ALERT TELEX- EUROCOPTER- ALERT TELEX- EUROCOPTER 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 electrica l 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 extracto r. -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 th e battery overheat sens in g i ndicator light, as pe r

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 ind icating connector 26P- P1 (a) . 2 . B. 1 .d. Fi nal 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 46 P-P1 (a) (male) from its socket base (c). Page 4 of7 

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### ALERT TELEX- EUROCOPTER- ALERT TELEX- EUROCOPTER- ALERT TELEX- EUROCOPTER 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 term inals 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 Tas k 24-00-00 , 2- 1 . - Connect battery temperature indicating connector 46P-P1 (a). 2 . B.2 . d . Final steps

- Clos e 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 .

Page 5 of7 

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## PRE MOD 

## 073572 T.F.S. No.00000279 dated December 20 , 2005 EUROCOPTER - MARIGNANE - TLX 42506F



# b

,.---BA_m_R v __ __, 

## 26p.p 1 38DEL- ..., P

.f'- 2 ..,---,!'----'-J r----- - 1 PW35E 

### I: JaonE•L I

**~** : D f-----------------f 20 • • 

# r-·--• I



### •-----~ c 1PW36 E 21 

# ! !

**~---- --------**  **-----** 

# ---

**---;~ -y--L~** 

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

### Page 6 of7 ALERT TELEX- EUROCOPTER- ALERT TELEX- EUROCOPTER- ALERT TELEX- EUROCOPTER

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## PRE MOD 

## 073572 BAm R Y r·---- "---" '

**~·** --• : • _____ _: ' I ' ._ ___ 

### ·-- -- 

## -- ·------ --- .o46P T AILOOOM 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--1 PW42F 20 

### , 38DEL,



# 1PW41E~j}--1PW41F 1 

# ! ! P1 86DE L.J1 

# )-,.--J TAIL BOOM HOLD 705 695 

### 38 D E L-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 Page 7 of7 

### ALERT TELEX- EUROCOPTER- ALERT TELEX- EUROCOPTER- ALERT TELEX- EUROCOPTER