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 . MANPOWE R: 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 OWNERTB 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 positi on 7, J6A24 from position 8, L123A24 from position 10, L122A24 from position 11. Q146A24 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, L122A24 into position 10, L123A24 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, L1 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 108A24 into position 10, L109A24 into position 11, Q140A24 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 eng ine 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, L123A24 from position 10, L122A24 from position 11 . 0227A24N 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, L122A24 into position 10, L123A24 into position 11 , 0227A24N 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 109A24 from position 10, L108A24 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- 1 1, insert the following wires into switch (1 S8) : J1A24 into position 5, J2A24 into position 6, Q149A24 into position 7, Q149C24 into position 8, L108A24 into position 10, L 109A24 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 ( 1S3) 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 . 1 5. Open the eng ine No . 1 and eng ine No.2 FIRE EXTG circu it 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 8 131 

### TOP 

### c

Figure 2 2



### Switch Termination Schematic TB 222-03-171 Page 9 of 13TB 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 DiagramENG 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 DiagramTB 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