Landing Gear and Brakes Hydraulic System Landing Gear and Brakes

Landing Gear Hydraulically Operated Electrically Powered Tricycle Landing Gear Air-Oil Strut Type (Oleo) Fully Retractable Nose Main

Limitations Retraction / Extension 6-7 Seconds VLO Retracting - 109 KIAS VLO Extending - 140 KIAS VLE - 140 KIAS

Hydraulics An Oildyne Reversible Hydraulic Pump Reservoir Hydraulic Fluid MIL-H-5606 Do Not Mix Types

Hydraulics Gear Extension Drive gear Driven gear Shuttle valve Actuators Double acting Unbalance Linear Gear Extension

Hydraulics Gear Retraction Drive gear Driven gear Shuttle valve Actuators Double acting Unbalance Linear

Hydraulics Pressure switch Pressure control Off 1800 +/- 100 PSI On 1500 +/- 100 PSI Pressure control High (2400 +/- 200 PSI) Low (600 +/- 200 PSI) Thermal relief (3000 PSI)

Normal Operation Hydraulic Down Delivered Pressure 400 - 800 psi Down lock switches turn pump off Up 1500 - 1800 psi Hydraulic pressure holds gear up Pressure switch turns pump off

Hydraulics Emergency Gear Extension Knob Checklist - airspeed reduce below 100 kts Gravity will allow the gear to extend

Gear Warning Gear Warning Annunciator Light Conditions In Transit Down Lock Switches Disengaged Up Lock Switches Disengaged

Gear Warning Gear Warning Horn Conditions Guard against gear up landing Conditions Squat Switch Closed (airborne) Gear Selector Up Down Lock Switches Open (Gear Up) Throttle Switch (14”) or Flap Switch (16o)

Gear Warning Gear Warning Conditions What prevents Gear Up On Ground? Down Lock Switches Closed (Down & Locked) Squat Switch Open (Ground) Gear Selector Switch Up

Hydraulic Pump Control Gear Selector Switch -Up Hydraulic Pump Up Relay Hydraulic Pressure Switch (Below 1400 PSI) Squat Switch Closed (Airborne)

Hydraulic Pump Control Gear Selector Switch - Down Hydraulic Pump Down Relay

Hydraulic Pump Power Hydraulic Pump - Up Relay Pressure Switch will turn motor Off at 1800 psi + or - 100 psi

Hydraulic Pump Power Hydraulic Pump - Down Relay Down Lock Switches turns off motor when all three engaged To downlock switches

WHEEL BRAKES

Purpose of Brake System Provide sufficient friction to stop the airplane on landing (if required) Hold the airplane during engine run-up Absorb kinetic energy of the wheel and convert it into heat and… dissipate the resultant heat as efficiently and quickly as possible

Brake System Reservoir Master Cylinders Fluid Line Parking Brake Valve MIL-H-5606 Do Not Mix Types Master Cylinders Fluid Line Parking Brake Valve Brake Assembly

Brake System Brake Master Cylinders Toe Brakes Parking Brake

Brake System Brake lines Brake disc Brake housing Cleveland brakes Single disc Heavy duty Brake housing Double puck Brake linings (metallic) Cleveland brakes

QUIZ What turns off the electrical powered reversible hydraulic pump when the landing gear is retracted? A. The electrical limit uplock switches when all three engage B. The hydraulically activated pressure switch

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