DATE REV MODEL AFFECTED : SUBJECT: 

## TECHNICAL BULLETIN 

## Bell Helicopteri

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# I A Subsi diary of Textron Inc.

430 

### No . 430-03-33 Date 06-11-03 Page 1 of 8

FUEL VALVE SWITCH, REWIRING OF HELICOPTERS AFFECTED: Model 430 helicopters serial number 49001 through 49101

COMPLIANCE: DESCRIPTION: 

### [Model 430 helicopters serial numbers 49102 and subsequent will have the intent of this bulletin accomplished prior to delivery .] Bell Helicopter recommends compliance with this bulletin . We have received field reports of failure of the switches , P/N 10648BH 1-1 , that control the operation of the No . 1 and No2 eng ine fuel valves. There is a poss ibility that the switch may fail in flight , due to vibration , causing the switch to open and then causing the fuel valve to revert to the closed condition and subsequent shut down of the associated engine. APPROVAL : 

### Th e en gin ee rin g desig n aspects of this bull etin are Transpo rt Can ada approved . MANPOWER: 

### Approximately 4.0 man-hours are required to complete this bulletin . Man-hours are based on hands-on time, and may vary with personnel and facilities available. MATERIALS: 

### None
AN APPROPRIATE ENTRY SHOULD BE MADE IN THE AIRCRAFT LOGBOOK UPON ACCOMPLISHMENT IF OWNERSHIP OF AIRCRAFT HAS CHANGED PLEASE FORWARD TO NEW OWNERTB 430-03-33 Page 2 of 8 SPECIAL TOOLS : M81969/14- 11 Insertion/Extraction tool WEIGHT AND BALANCE: Not affected ELECTRICAL LOAD DATA: Not affected REFERENCES: BHT-430-MM-1 0 Maintenance Manual BHT-430-MM-12 Maintenance Manual PUBLICATIONS AFFECTED: BHT-430-MM-1 0 Maintenance Manual BHT-430-MM-12 Maintenance Manual ACCOMPLISHMENT INSTRUCTIONS: 1. Prepare the helicopter for maintenance 2 . Ensure all electrical power is removed from the helicopter. 3 . Disconnect the aircraft battery. 4. Carefully lower the overhead console. 5 . Locate the No.1 engine Fuel Valve Switch (1 S3) . 6 . Using an extraction tool, P/N M81969/14-11 , remove the following wires from switch (1 S3): J5A22 from position 7 , J6A22 from position 8 , 

### L1 23A22 from position 1 0 , L122A22 from positi on 11 . Q121A22 from position 13, Q227A22N from position 14, Q146A22 from position 16, Q 144A22 from position 17 . 7. Using an insertion tool, P/N M81969/14-11 , insert the following wires into switch (1 S3):J5A22 into position 5 , J6A22 into position 6 , L122A22 into position 10 , L123A22 into position 11 , 0227 A22N into position 13 , 0121A22 into position 14 , 0144A22 into position 16 , 0146A22 into position 17 . 8. Locate the No.2 engine Fuel Valve Switch (1 S8) . TB 430-03 -33 Page 3 of 8

9 . Using an extraction tool, P/N M81969/14-11, remove the following wires from switch (1 S8) : J1A22 from position 7, J2A24 from position 8 , L 109A22 from position 10, L108A22 from position 11 . 0148822 from position 13 , 0228A22N from position 14, 0141A22 from position 16 , 0140A22 from position 17 . 10 . Using an insertion tool , P/N M81969/14-11 , insert the following wires into switch (1 S8) : J1A22 into position 5 , J2A22 into position 6, L 108A22 into position 10 , L 109A22 into position 11 , 0228A22N into position 13, 0148822 into position 14 , 0140A22 into position 16 , 0141A22 into position 17 . 11 . Carefully raise the overhead cont ro l console and re-secure . 12. Pu sh th e ENG 1 FUEL VALVE switch (1S3) and the ENG 2 FUEL VALVE switch (1 S8) to the "in" position. 13 . Apply a 28 Vdc power source to the aircraft . (8HT-430-MM-1 0) . 14 . Push the ENG 1 FUEL VALVE switch (1S3) to ON and observe the following : a . The green light of the switch comes on . b. The engine No . 1 fuel valve opens. c . The liDS shows a 1FUEL VALVE indication . 15 . Push the ENG 2 FUEL VALVE switch (1S3) to ON and observe the following :TB 430-03-33 Page 4 of 8



### a. The green light of the switch comes on . b . The engine No .2 fuel valve opens . c. The liDS shows a FUEL VALVE 2 in dication . 16 . Open the engine No . 1 and engine No .2 FIRE EXTG circuit breakers (CB- F9 and CB-F1 0) 17. Push in the FIRE/ARM/ENG 1 switch (1DS1 ) to ARM and observe the following : a. The engine No.1 fuel valve closes . b. The liDS shows a 1 FUEL VALVE indication . 18. Push the FIRE/ARM/ENG 1 switch . . 19 . Push in the FIRE/ARM/ENG 2 switch (1 DS2) to ARM and observe the following : a . The engine No .2 fuel valve closes . b. The liDS shows a FUEL VALVE 2 indication. 20 . Push the FIRE/ARM/ENG 2 switch . 21 . Close the engine No . 1 and engine No.2 FIRE EXTG circuit breakers (CB- F9 and CB-F1 0) . 21. Carry out an operational test of the ignitor system . (BHT-430-MM-1 0). 22 . Annotate the helicopter records to reflect comp liance with this bulletin . 23. Return the helicopter to flight status .WIRE NO . 

### JIA22 J2A22 L108A22 L109A22 Q140A22 Q141A22 0148822 Q228A22N J5A22 J6A22 L122A22 L123A22 Q121A22 Q144A22 Q146A22 Q227A22N RE-TERMINATION WIRE CHART REF DES FROM PIN 

### 1S8 7 1S8 8 1S8 11 1S8 10 1S8 17 1S8 16 1S8 13 1S8 14 1S3 7 1S3 8 1S3 11 1S3 10 1S3 13 1S3 17 1S3 16 1S3 14



### Figure 1 Wire Termination Chart TO PIN 

### 5 6 10 11 16 17 14 ' 

### 13 5 6 10 11 14 16 17 13 TB 430-03-33 Page 5 of 8TB

### 430~03-33 Page 6 of 8

1 

### TOP 

### c 2.

3 4



### Figure 2 Switch Termination Schematic)_

) 

### \ ' 

## s-- J6A22 ENG 1 FUEL VALVE SWITCH 

## I 1S3 

## I L48C22 

### --------2

L42C22N 

### ----2

PRE MOD

ENG 1 FUEL VALVE SWITCH 

## I 1S3 

## I TB 430-03-33 Page 7 of 8

**JSA22 ----------------~**  Q151A22 ------------------.' L42C22N -----.J Q155E22

**---~** Q123A22

**--~** POST MOD

03536001 

### Figure 3 No.1 Fuel Valve Switch Wiring Diagram

# . . TB 430-03-33 Page 8 of 8

)



### ~------~------4----J2A22 c



## s--

) 

### \ J2A22 c ENG 2 FUEL VALVE SWITCH 

## I 1S8 

## I L47K22 -------2

L43C22N -2

PRE MOD

ENG 2 FUEL VALVE SWITCH 

## I 1S8 

## I

J1A22 ----------------<' Q149A22 ---------------,J L42C22N -----( Q157E22 -----r' Q122A22 ---,> POST MOD

03536002 

### Figure 4 No.2 Fuel Valve Switch Wiring Diagram