DATE 

REV 

MODEL AFFECTED: 

SUBJECT: 

TECHNICAL BULLETIN 

Bell Helicopter i i :t:1 i tt •) : I 

A Subsidiary of Textron Inc. 

222/2228 

No. 

Date 

Page 

FUEL VALVE SWITCH, REWIRING OF 

222-03-171 

06-11 -03 

1 of 13 

HELICOPTERS AFFECTED: Model 222 helicopters serial number 47006 

through 47089 and Model 2228 helicopters serial 

number 47131 through 47156 

COMPLIANCE: 

DESCRIPTION: 

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 No. 2 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. 

Part 1 of this bulletin is applicable to Model 222, SIN 47006-47038. 

Part 2 of this bulletin is applicable to Model 222, SIN 47039- 47089 and Model 2228, 

SIN 47131 -47156. 

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. 

AN APPROPRIATE ENTRY SHOULD BE MADE IN THE AIRCRAFT LOGBOOK UPON ACCOMPLISHMENT 

IF OWNERSHIP OF AIRCRAFT HAS CHANGED PLEASE FORWARD TO NEW OWNER 
TB 222-03-171 

Page 2 of 13 

MATERIALS: 

None 

SPECIAL TOOLS: 

M81969/14-11 Insertion/Extraction tool 

WEIGHT AND BALANCE: 

Not affected 

ELECTRICAL LOAD DATA: 

Not affected 

REFERENCES: 

8HT-222/2228-MM Maintenance Manual 

PUBLICATIONS AFFECTED: 

8HT-222/2228-MM Maintenance Manual 

ACCOMPLISHMENT INSTRUCTIONS: 

PART 1- Model 222, S/N 47006-47038 

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 83). 

6. Using an extraction tool, P/N M81969/14-11, remove the following wires from 

switch (1 83): 

J5A24 from position 7, 

J6A24 from position 8, 

L 123A24 from position 10, 

L 122A24 from position 11. 

Q 146A24 from position 16, 

Q144A24 from position 17. 
TB 222-03-171 

Page 3 of 13 

7. Using an insertion tool, P/N M81969/14-11, insert the following wires into switch 

(1 S3): 

J5A24 into position 5, 

J6A24 into position 6, 

L 122A24 into position 10, 

L 123A24 into position 11 , 

Q144A24 into position 16, 

Q146A24 into position 17. 

8. Locate the No.2 engine Fuel Valve Switch (1 S8). 

9. Using an extraction tool, P/N M81969/14-11, remove the following wires from 

switch (1 S8): 

J1A24 from position 7, 

J2A24 from position 8, 

L 1 09A24 from position 10, 

L 1 08A24 from position 11. 

Q141A24 from position 16, 

Q140A24 from position 17. 

10. Using an insertion tool , P/N M81969/14-11, insert the following wires into switch 

(1 S8): 

J1A24 into position 5, 

J2A24 into position 6, 

L 1 08A24 into position 10, 

L 1 09A24 into position 11, 

Q 140A24 into position 16, 

Q141A24 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. (BHT-222/2228-MM-2). 

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 ENG 1 FUEL VALVE caution panel segment will come on for as 

long as the fuel shut valve is operating. 

15. Push the ENG 2 FUEL VALVE switch (1S3) to ON and observe the following: 
TB 222-03-171 

Page 4 of 13 

a. The green light of the switch comes on. 

b. The engine No.2 fuel valve opens. 

c. The ENG 2 FUEL VALVE caution panel segment will come on for as 

long as the fuel shut valve is operating. 

16. Open the engine No.1 and engine No.2 FIRE EXTG circuit breakers (24CB1 

and 24CB2). 

17. Set the ENGINE 1 ARM fire extinguisher switch to ARM and observe the 

following : 

a. The engine No.1 fuel valve closes. 

b. The ENG 1 FUEL VALVE caution panel segment will come on for as 

long as the fuel shut valve is operating. 

18. Set the ENGINE 1 ARM fire extinguisher switch to NORM and the ENG 1 FUEL 

VALVE switch to OFF. 

19. Set the ENGINE 2 ARM fire extinguisher switch to ARM and observe the 

following : 

a. The engine No.2 fuel valve closes. 

b. The ENG 2 FUEL VALVE caution panel segment will come on for as 

long as the fuel shut valve is operating. 

20. Set the ENGINE 2 ARM fire extinguisher switch to NORM and the ENG 2 FUEL 

VALVE switch to OFF. 

21 . Close the engine No.1 and engine No.2 FIRE EXTG circuit breakers (24CB1 

and 24CB2). 

21 . Carry out an operational test of the ignitor system. (BHT-222/2228-MM-2). 

22. Annotate the helicopter records to reflect compliance with this bulletin. 

23. Return the helicopter to flight status. 

PART 2 - Model 222, S/N 47039 - 47089 and Model 2228, S/N 47131 - 47156 

1. Prepare helicopter for maintenance. 

2. Ensure that all electrical power is removed from the helicopter and aircraft 

battery is disconnected. 

3. Carefully lower the overhead console. 

4. Locate the No.1 engine Fuel Valve Switch (1 S3). 

5. Using an extraction tool, P/N M81969/14-11 , remove the following wires from 

switch (1 S3): 
0151A24 from position 5, 

0151 C24 from position 6, 

J5A24 from position 7, 

J6A24 from position 8, 

L 123A24 from position 10, 

L 122A24 from position 11 . 

0227 A24N from position 14, 

0146A24 from position 16, 

0144A24 from position 17, 

TB 222-03-171 

Page 5 of 13 

6. Using an insertion tool, P/N M81969/14-11, insert the following wires into switch 

(1 S3): 

J5A24 into position 5, 

J6A24 into position 6, 

0151A24 into position 7, 

0151C24 into position 8, 

L 122A24 into position 10, 

L 123A24 into position 11 , 

0227 A24N into position 13, 

0144A24 into position 16, 

0146A24 into position 17, 

7. Locate the No.2 engine Fuel Valve Switch (188). 

8. Using an extraction tool, P/N M81969/14-11 , remove the following wires from 

switch (1 S8): 

J1A24 from position 7, 

J2A24 from position 8, 

0149A24 from position 5, 

0149C24 from position 6, 

L 1 09A24 from position 10, 

L 1 08A24 from position 11 . 

0228A24N from position 14, 

0141A24 from position 16, 

0140A24 from position 17, 
TB 222-03-171 

Page 6 of 13 

9. Using an insertion tool, P/N M81969/14-11, insert the following wires into switch 

(1 S8): 

J1A24 into position 5, 

J2A24 into position 6, 

Q149A24 into position 7, 

Q149C24 into position 8, 

L 1 08A24 into position 10, 

L 1 09A24 into position 11, 

Q228A22N into position 13, 

Q140A24 into position 16, 

Q141A24 into position 17, 

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

11 . Push the ENG 1 FUEL VALVE switch ( 1 S3) and the ENG 2 FUEL VALVE 

switch (1 S8) to the "in" position. 

12. Apply a 28 Vdc power source to the aircraft. (BHT-222/2228-MM-2). 

13. 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 ENG 1 FUEL VALVE caution panel segment will come on for as 

long as the fuel shut valve is operating. 

14. Push the ENG 2 FUEL VALVE switch (1S3) to ON and observe the following : 

a. The green light of the switch comes on. 

b. The engine No.2 fuel valve opens. 

c. The ENG 2 FUEL VALVE caution panel segment will come on for as 

long as the fuel shut valve is operating. 

15. Open the engine No.1 and engine No.2 FIRE EXTG circuit breakers (24CB1 

and 24CB2) 

16. Set the ENGINE 1 ARM fire extinguisher switch to ARM and observe the 

following: 

a. The engine No.1 fuel valve closes. 

b. The ENG 1 FUEL VALVE caution panel segment will come on for as 

long as the fuel shut valve is operating. 

17. Set the ENGINE 1 ARM fire extinguisher switch to NORM and the ENG 1 FUEL 

VALVE switch to OFF. 
TB 222-03-171 

Page 7 of 13 

18. Set the ENGINE 2 ARM fire extinguisher switch to ARM and observe the 

following: 

a. The engine No.2 fuel valve closes. 

b. The ENG 2 FUEL VALVE caution panel segment will come on for as 

long as the fuel shut valve is operating. 

19. Set the ENGINE 2 ARM fire extinguisher switch to NORM and the ENG 2 FUEL 

VALVE switch to OFF. 

20. Close the engine No.1 and engine No.2 FIRE EXTG circuit breakers (24CB1 

and 24CB2). 

21 . Carry out an operational test of the ignitor system. (BHT-222/2228-MM-2). 

22. Annotate the helicopter records to reflect compliance with this bulletin. 

23. Return the helicopter to flight status. 
TB 222-03-171 

Page 8 of 13 

WIRE NO. 

J5A24 

J6A24 

L122A24 

L 123A24 

Q144A24 

Q146A24 

JIA24 

J2A24 

L108A24 

L109A24 

Q140A24 

Q141A24 

RE-TERMINATION WIRE CHART 

MODEL 222 S/N 47006 TO 47038 

REF DES FROM PIN 

1S3 7 

1S3 8 

1S3 11 

1S3 10 

1S3 17 

1S3 16 

1S8 7 

1S8 8 

1S8 11 

1S8 10 

1S8 17 

1S8 16 

RE-TERMINATION WIRE CHART 

MODEL 222 S/N 47039 TO 47089 

AND MODEL 2228 S/N 47131 TO 47156 

WIRE NO. REF DES FROM PIN 

J5A24 1S3 7 

J6A24 1S3 8 

L 122A24 1S3 11 

L 123A24 1S3 10 

Q144A24 1S3 17 

Q146A24 1S3 16 

Q227A24N 1S3 14 

Q151A24 1S3 5 

Q151C24 1S3 6 

JIA24 1S8 7 

J2A24 1S8 8 

L108A24 1S8 11 

L 109A24 1S8 10 

Q140A24 1S8 17 

Q141A24 1S8 16 

Q149A24 1S8 5 

Q149C24 1S8 6 

Q228A24N 1S8 14 

TO PIN 

5 

6 

10 

11 

16 

17 

5 

6 

10 

11 

16 

17 

TO PIN 

5 

6 

10 

11 

16 

17 

13 

7 

8 

5 

6 

10 

11 

16 

17 

7 

8 

13 
1 

TOP 

c 

Figure 2 

2 

Switch Termination Schematic 

TB 222-03-171 

Page 9 of 13 
TB 222-03-171 

Page 10 of 13 

,?-'---+------+--J6A24 

ENG 1 FUEL VALVE SWITCH 

I 1S3 I 

L48C24 --2 

L42C22N -------2 

PRE MOD 

MODEL 222 S/N 47006 TO 47038 

ENG 1 FUEL VALVE SWITCH 

I 1S3 I 

,r'--'---+-+------J6A24 J5A24 ---------r' 

L42C22N -------2 

Q145A24 __ ...,., 

POST MOD 

MODEL 222 S/N 47006 TO 47038 

03535001 

Figure 3 

No.1 Fuel Valve Switch Wiring Diagram 
ENG 2 FUEL VALVE SWITCH 

I 1S8 I 

L47A24--2 

L43C22N --2 

PRE MOD 

MODEL 222 S/N 47006 TO 47038 

ENG 2 FUEL VALVE SWITCH 

I 1S8 I 

TB 222-03-171 

Page 11 of 13 

~----~------------ J2A24 J1A24 ------------------r' 

L43C22N--2 

Q143A24 -----r' 

POST MOD 

MODEL 222 S/N 47006 TO 47038 

03535002 

Figure 4 

No.2 Fuel Valve Switch Wiring Diagram 
TB 222-03-171 

Page 12 of 13 

ENG 1 FUEL VALVE SWITCH 

I 1S3 I 

L48C24-2 

\r----+------t--J6A24 c 

' 

) 

c 

L42C22N --( 

PRE MOD 

MODEL 222 S/N 47039 TO 47086 AND 

MODEL 2228 S/N 47131 TO 47156 

s---

ENG 1 FUEL VALVE SWITCH 

I 1S3 I 

J5A24 -------------1 

Q151A24 -------.' 

L42C22N--( 

Q155E24--2 

Q145A24 ---,J 

POST MOD 

MODEL 222 S/N 47039 TO 47086 AND 

MODEL 2228 S/N 47131 TO 47156 

Figure 5 

No.1 Fuel Valve Switch Wiring Diagram 

03535003 
.. 

' 

ENG 2 FUEL VALVE SWITCH 

I 1s8 I 

L47A24 --2 

TB 222-03-171 

Page 13 of 13 

cr'------t------+--J2A24 

\ 

l 

L43C22N -2 

PRE MOD 

MODEL 222 S/N 47039 TO 47086 AND 

MODEL 2228 S/N 47131 TO 47156 

ENG 2 FUEL VALVE SWITCH 

I 1s8 I 

s--

J1A24 ---------r' 

Q149A24 ---------r' 

L43C22N-2 

Q157E24----r' 

Q143A24 ----r' 

POST MOD 

MODEL 222 S/N 47039 TO 47086 AND 

MODEL 2228 S/N 47131 TO 47156 

Figure 6 

No.2 Fuel Valve Switch Wiring Diagram 

03535004