1. Landing Gear and Brakes
Hydraulic System
Landing Gear and Brakes

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

3. Limitations Retraction / Extension 6-7 Seconds
VLO Retracting KIAS
VLO Extending KIAS
VLE KIAS

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

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

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

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

8. Normal Operation Hydraulic
Down
Delivered Pressure
psi
Down lock switches turn pump off Up
psi
Hydraulic pressure holds gear up
Pressure switch turns pump off

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

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

11. 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)

12. 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

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

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

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

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

17. WHEEL BRAKES

18. 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

19. 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

20. Brake System
Brake Master Cylinders
Toe Brakes
Parking Brake

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

22. 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

23. end