DATE 

REV 

MODEL AFFECTED: 

SUBJECT: 

TECHNICAL BULLETIN 

Bell Helicopteri i ~:i i ~t·J: I 

A Subsidiary 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 1 0648BH 1-1 , that control 

the operation of the No.1 and No2 engine fuel valves. There is a possibility 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: 

The engineering design aspects of this bulletin are Transport Canada 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 OWNER 
TB 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, 

L 123A22 from position 10, 

L 122A22 from position 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, 

L 122A22 into position 1 0, 

L 123A22 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 1 09A22 from position 10, 

L 1 08A22 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 1 08A22 into position 10, 

L 1 09A22 into position 11 , 

0228A22N into position 13, 

0148822 into position 14, 

0140A22 into position 16, 

0141A22 into position 17. 

11 . Carefully raise the overhead control console and re-secure. 

12. Push the 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 indication. 

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 compliance 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 8 
TB 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 

) 

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

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