Hawker 125 (Series 1 through 900XP)

Fuel Booster Pumps

1. 
   Inoperative pump is deactivated.
   
2. 
   Crossfeed and Wing Transfer Valves are operative.
   
3. 
   Aircraft is operated in accordance with AFM Supplement.
   
4. 
   Low Pressure (LP) Fuel Warning System is operative.
   
5. 
   Both Wing Fuel Content Indicators are operative.
   
6. 
   Repairs are made within three flight cycles.
   

1. 
   Refer to Table 1 and do the Fuel Booster Pump Deactivation procedure.
   
2. 
   Make sure the Crossfeed and Wing Transfer Valves are operative by checking fuel gauge for movement.
   
3. 
   Make sure the LP Fuel Warning System is operative.
   
4. 
   Make sure both Fuel Content Indicators are operative.
   

1. 
   Observe limitations and procedures in AFM Supplement “Flight With One Pump Inoperative”.
   

Wing Transfer Magnetic Indicator (Series 1 Through 400 Only)

1. 
   Both Fuel Booster Pumps are operative,
   
2. 
   Wing Fuel Content Indicators are operative, and
   
3. 
   Before each departure, TRANSFER and CROSSFEED Valves are verified operative.
   

1. 
   Move X FEED/TRANSFER lever to the transfer position.
   
2. 
   Sequentially, operate LH and RH fuel booster pumps. Fuel will transfer to the wing with the operating fuel boost pump, indicated by an increase in the respective fuel contents indicator.
   

Fuel Transfer/ Crossfeed Indicator (Series 600 Through 850XP Only)

1. 
   Both Fuel Booster Pumps are operative,
   
2. 
   Wing Fuel Content Indicators are operative, and
   
3. 
   Before each departure, TRANSFER and CROSSFEED Valves are verified operative.
   

1. 
   Move X FEED/TRANSFER lever to the crossfeed and transfer positions.
   
2. 
   Sequentially, operate LH and RH fuel boost pump. Fuel will transfer to the wing with the operating fuel boost pump, indicated by an increase in the fuel contents indicator.
   
3. 
   With lever in X FEED position and one boost pump operation, make sure both fuel low pressure annunciators extinguish.
   

Ventral Tank Fuel Transfer Valve

1. 
   Tank remains empty,
   
2. 
   Valve is secured closed, and
   
3. 
   Dorsal tank remains empty for Series 600 and 700.
   

1. 
   Defuel Dorsal (Series 600 and 700) and Ventral Tanks; Refer to Aircraft Maintenance Manual (AMM) 12-28 for cautions.
   

• 
  Select AUX FUEL TRANSFER cock OPEN.
  
• 
  Unlock and remove filler cap(s) from tank(s) being defuelled.
  
• 
  Unscrew blanking adapter from fuel drain valve and install the fuel drain adaptor assembly to tank(s).
  
• 
  Off-load fuel from each tank.
  
• 
  Remove the fuel drain adaptor assembly and install blanking adapter to fuel drain valve.
  

2. 
   Set valve selector in CLOSED position.
   
3. 
   Check valve FWD RH face of ventral tank) to make sure it is in the CLOSED position.
   
4. 
   Install ‘INOP placard adjacent to selector handle.
   

1. 
   Plan flight without ventral or dorsal fuel.
   
2. 
   Monitor refuel operations to make sure fuel is not placed in ventral or dorsal tanks.
   

Ventral Tank Transfer Light/ Annunciator

1. 
   Associated valve is verified operative, and
   
2. 
   Valve position is verified after each refueling.
   

1. 
   Access ventral tank transfer valve (FWD RH face of tank).
   
2. 
   Observe valve for proper position when selector is moved from CLOSED to OPEN.
   

1. 
   Tank remains empty, and
   
2. 
   Dorsal tank remains empty for Series 600 and 700.
   

Fuel Filter De-Icing Systems (Series 1 Through 600 With Viper Engines Only)

1. 
   Fuel temperature indicator is operative, and
   
2. 
   Automatic fuel pump filter ice warning Press-to-Test function is operative.
   

1. 
   Fuel temperature indicator is operative, and
   
2. 
   Fuel temperature remains at or above 5° C.
   

1. 
   Make sure the fuel temperature indication is normal.
   
2. 
   Monitor fuel temperature during flight and maintain 5°C or above.
   

Fuel Filter Warning Lights (Viper Engine Only)

1. 
   Select AUTO filter deice ON.
   
2. 
   Press affected warning light and make sure the filter deice pump runs.
   
3. 
   Leave filter deice in AUTO.
   

Pressure Fueling System

1. 
   Failure of the fueling system is verified not be due to fuel pipe leakage,
   
2. 
   Both refueling vent valves, master refuel valve, and refueling valves are closed, and
   
3. 
   Overwing refueling procedure is established and used.
   

1. 
   Inspect external lower fuselage for evidence of fuel leakage.
   
2. 
   Defuel Dorsal and Ventral fuel tanks.
   
3. 
   Make sure both refueling vent valves, master refuel valve, and dorsal and ventral refueling valves are closed (Refer to Pressure Refueling System Inactivation Procedure, Table 2.)
   

1. 
   Follow Overwing Fueling refueling procedures.
   
2. 
   Plan flight for Dorsal and Ventral fuel tanks empty.
   

1. 
   Failure of the fueling system is verified not be due to fuel pipe leakage.
   
2. 
   Master refueling valve and all tank refueling valves are closed, and
   
3. 
   Overwing refueling procedure is established and used.
   

1. 
   Inspect external lower fuselage for evidence of fuel leakage.
   
2. 
   Make sure the master refuel valve and ventral refueling valves are closed (Refer to Table 2 steps 2 and 4 for details).
   

1. 
   Follow Overwing Fueling refueling procedures.
   
2. 
   Plan flight for Ventral fuel tank empty.
   

Pressure Refuel Blanking Cap

Wing Tank Fuel Content Indicators

1. 
   Before departure, fuel quantity in associated tank is verified by an alternate means,
   
2. 
   All remaining fuel system components are operative,
   
3. 
   FUEL FLOW/FUEL USED COUNTER/ FUEL TOTALIZER indicators are operative,
   
4. 
   Aircraft remains within one (1) hour flying time from a suitable airport, and
   
5. 
   Alternate procedures for monitoring enroute fuel consumption are established and used.
   

1. 
   Make sure the fuel in the associated wing tank is full by checking wing filler cap, or
   
2. 
   Airplane is fueled with a known quantity from an empty condition.
   
3. 
   All remaining fuel system components are operative.
   
4. 
   Aircraft must remain within one (1) hour flying time of a suitable airport at all times.
   
5. 
   Fuel Used Counter/Fuel Totalizer indicators are used to determine remaining fuel.
   

Fuel Used Counter(s)/Fuel Totalizer(s)

1. 
   Wing Tank Content Indicators are operative, and
   
2. 
   Alternate procedures for monitoring enroute fuel consumption are established and used.
   

1. 
   Make sure the wing fuel contents indicators are operative.
   
2. 
   Regularly compute fuel remaining or check FMS for fuel remaining, or
   
3. 
   Compute fuel remaining utilizing Aircrew Manual Performance charts.
   

Ventral Tank “EMPTY/FULL” Indicator

1. 
   Ventral Tank is verified to be empty before each departure, and
   
2. 
   Procedures are established and used to make sure fuel is not transferred into Ventral Tank during flight.
   

1. 
   Defuel Ventral Tank IAW AMM Chapter 12.
   
2. 
   Check that Ventral Tank EMPTY/FULL indicator is extinguished.
   
3. 
   If Ventral Tank EMPTY/FULL indicator is not extinguished, disconnect Ventral Tank Float Switch, bag and stow connector.
   

Dorsal Tank “Empty/Full” Indicator (Series 600 and 700, Only)

1. 
   Dorsal Tank is verified empty before each departure, and
   
2. 
   Procedures are established and used to make sure fuel is not transferred into Dorsal Tank during flight.
   

Low VMO Audible Warning System

1. 
   Ventral tank is verified empty before each departure, and
   
2. 
   Procedures are established and used to make sure fuel is not transferred into Ventral Tank during flight.
   

1. 
   If aircraft has not been refueled since previous flight, make sure ventral fuel was transferred from the tank on previous flight.
   
2. 
   If aircraft has been refueled since previous flight, make sure the ventral tank is empty by checking sump drains. Ventral tank must be Single Point defueled and drained if fuel is present at sump.
   

1. 
   Ventral and Dorsal Tanks are verified empty before each departure, and
   
2. 
   Procedures are established and used to make sure fuel is not transferred into Ventral Tank or Dorsal Tank during flight.
   

1. 
   If aircraft has not been refueled since previous flight, make sure dorsal and ventral fuel was transferred from tanks on previous flight.
   
2. 
   If aircraft has been refueled since previous flight, make sure the dorsal tank is empty which requires the ventral tank to be empty also. Both the ventral and dorsal tank must be defueled and drained if fuel is present at sump.
   

Fuel Vent Surge Tank Indicators (Series 3A/RA, 3B/ RA Through 600 Only)

1. 
   Both fuel content indicators are operative, and
   
2. 
   Vent valves are operative.
   

1. 
   Drain any fuel from Vent Surge Tanks.
   
2. 
   Quantity drained must be less than one (1) gallon.
   

Fuel Temperature Indicator

1. 
   Fuel filter ice warning system is operative,
   
2. 
   Fuel filter de-icing system is operative,
   
3. 
   OAT indicator is operative, and
   
4. 
   Fuel temperature AFM Limitations are applied.
   

1. 
   Prior to each flight with fuel pumps OFF, select AUTO fuel filter deicing.
   
2. 
   Press FILTER TEST and ENG 1/ENG 2 LO PRESS and FUEL annunciators shall extinguish.
   
3. 
   Make sure the OAT indicator is operative.
   
4. 
   Do not operate where OAT is below minimum AFM fuel temperature limit.
   

1. 
   OAT indicator is operative, and
   
2. 
   Fuel temperature AFM Limitations are applied.
   

1. 
   Make sure the OAT indicator is operative.
   
2. 
   Do not operate where OAT is below minimum AFM fuel temperature limit.
   

45-2

Fuel Management Computer System (Garrett GEMS System)