Hawker 125 (Series 1 through 900XP)

30-1

L/R HYD LO FLOW Annunciators (Viper Engines, Only)

1. 
   Associated hydraulic pump is operative,
   
2. 
   Main hydraulic supply pressure indicator is operative,
   
3. 
   EMRG HYD LO PRESS annunciator is operative,
   
4. 
   Associated engine is started first to verify pressure buildup before each departure.
   

1. 
   Confirm HYD LO PRESS indicator is operative.
   
2. 
   Prior to each departure, start the engine on the affected side first and confirm a pressure increase on the main hydraulic pressure indicator.
   
3. 
   If HYD LP lamp illuminates in flight, follow EMERGENCY BRAKE SUPPLY FAILURE drill.
   

HYD LO PRESS 1 or 2 Annunciators (TFE-731 Engines, Only)

1. 
   Associated hydraulic pump is operative,
   
2. 
   Main hydraulic supply pressure indicator is operative.
   
3. 
   EMRG BRK LO PRESS annunciator is operative, and
   
4. 
   Associated engine is started first to verify pressure buildup before each departure.
   

1. 
   Prior to each departure,
   

• 
  Prior to engine start, select Emergency Brake and operate brake pedals until EMER BRK LO PRESS annunciator illuminates.
  

• 
  Start the associated engine first and observe pressure build up on the main hydraulic pressure indicator.
  
• 
  Observe EMER BRK LO PRESS annunciator OFF at 2250 to 2450 psi.
  

2. 
   Series 1 thru 700: If brake EMERG BRK LO PRESS warning light illuminates in flight, follow EMERGENCY BRAKE SUPPLY FAILURE drill.
   

Combined Brakes and SUPPLY Pressure Gauge

1. 
   Main hydraulic SUPPLY indication is within normal limits,
   
2. 
   Emergency Brake Pressure Indicators/Annunciators are verified operative, and
   
3. 
   Normal braking is confirmed independently for left and right brakes.
   

1. 
   Prior to each departure:
   

• 
  Confirm Supply Pressure indication is normal.
  
• 
  Prior to taxi, select EMRGY wheel brake and confirm both 1 and 2 WHEEL BRAKE EMRGY annunciators illuminate.
  

2. 
   Confirm normal braking independently for left and right brakes.
   

Accumulator Pressure Indicators

AUX HYD LO LEVEL Annunciator (Series 3 Through 900XP, Only)

1. 
   Gain access to Nose Landing Gear (NLG) wheel well.
   
2. 
   Visually confirm Auxiliary AUX HYD Reservoir has adequate quantity prior to each departure.
   

Accumulator Pressure Indicators (Main and Emergency Brake Only)

1. 
   Combined BRAKES and SUPPLY Pressure Gauge is operative, and
   

2. 
   Associated accumulator pre-charge is verified adequate before the first flight of each day.
   

1. 
   Perform the following prior to the first flight of each day:
   

• 
  With engines not operating, check hydraulic pressure indicator pressure to be ~2,300 PSI.
  
• 
  Operate brakes five (5) times and confirm negligible change in hydraulic pressure.
  

2. 
   Select WHEEL BRAKE lever to EMERGY and operate brakes 5 times. Confirm EMERG BRAKE annunciators illuminate.
   

30-7

1. 
   Thrust Reversers are verified operative, and
   
2. 
   Main Hydraulic Accumulator pressure is verified normal.
   

1. 
   Prior to each departure, confirm Thrust Reversers are operative, and
   
2. 
   Confirm Main Hydraulic Accumulator pressure is normal.