Landing Gear

Terminal Learning Objective Action: Identify the subsystems of the C-12T2/U landing gear system and explain the basic operating principles. Condition: Using student handout and classroom notes. Standard: IAW the IGRV SEP

RISK ASSESSMENT LEVEL: IV, D, LOW ENVIRONMENTAL CONSIDERATIONS: SAFETY REQUIREMENTS: NONE RISK ASSESSMENT LEVEL: IV, D, LOW ENVIRONMENTAL CONSIDERATIONS: NO IMPACT

C-12T2/U Landing Gear System Description Electrically Activated Switches, relays, electrically powered valves are actuated when the landing gear switch is moved in the cockpit Hydraulically Operated Pressurized fluid is moved to the landing gear hydraulic actuators to raise and lower the landing gear.

C-12 Landing Gear System Cockpit Switches

C-12 Landing Gear System Fill Reservoir

C-12 Landing Gear System Fill Reservoir

C-12 Landing Gear System Fluid Level Dipstick

C-12 Landing Gear System Main Reservoir

C-12 Landing Gear System Reservoir / Power Pack

C-12 Landing Gear System Accumulator

C-12 Landing Gear System Description 3 lines from the pump to each gear actuator Retraction (becomes return line during extension) Extension (becomes return line during retraction) Emergency Gear are held up with hydraulic pressure 2474 psi to 2775 psi Gear are held down with over-center locks

C-12 Landing Gear System Retraction Operations

C-12 Landing Gear System Extension Operations

C-12 Landing Gear System Emergency Extension Operations

C-12 Landing Gear System Check Valves

C-12 Landing Gear System Nose Gear Landing/Taxi Lights

C-12 Landing Gear System Turning Limits

C-12 Landing Gear System Crush Block

C-12 Landing Gear System Nose Gear Torque Knee

C-12 Landing Gear System Shimmy Dampner

C-12 Landing Gear System Main Gear Drag Brace

C-12 Landing Gear System Main Gear Down Lock

C-12 Landing Gear System Main Gear Door

C-12 Landing Gear System Main Gear Door

C-12 Landing Gear System Main Gear Torque Knee

C-12 Landing Gear System Safety Switch

C-12 Landing Gear System Brake Fluid Reservoir

C-12 Landing Gear System Main Brakes

C-12 Landing Gear System Pilot Brakes

C-12 Landing Gear System Co-Pilot Brakes

C-12 Landing Gear System Parking Brake Set

C-12 Landing Gear System Landing Gear Warning Horn

C-12 Landing Gear System Landing Gear Warning Horn

C-12 Landing Gear System Landing Gear Warning Horn

C-12 Landing Gear System Landing Gear Warning Horn

C-12 Landing Gear System Landing Gear Warning Horn

C-12 Landing Gear System Landing Gear Warning Horn

C-12 Landing Gear System Questions??????????

C-12 Landing Gear System

C-12 Landing Gear System Review Questions The landing gear are help in the position with ____________ and are held down with ____________.

C-12 Landing Gear System Review Questions The landing gear are help in the position with hydraulic pressure and are held down with over-center locks.

C-12 Landing Gear System Review Questions The brakes use the same type of hydraulic fluid used by the landing gear system. TRUE or FALSE The brakes use hydraulic fluid from the same reservoir as the landing gear system.

C-12 Landing Gear System Review Questions The brakes use the same type of hydraulic fluid used by the landing gear system. TRUE The brakes use hydraulic fluid from the same reservoir as the landing gear system. FALSE

C-12 Landing Gear System Review Questions The timer logic relay in the landing gear system will activate after the gear motor has been operating for ________.

C-12 Landing Gear System Review Questions The timer logic relay in the landing gear system will activate after the gear motor has been operating for 14 seconds.

C-12 Landing Gear System Review Questions The timer logic relay activates for gear retraction operations only. TRUE or FALSE

C-12 Landing Gear System Review Questions The timer logic relay activates for gear retraction operations only. FALSE

C-12 Landing Gear System Review Questions If the pilot raises the landing gear control switch, and the landing gear selector valve fails to operate: The gear will retract normally. The gear will not retract. The timer logic relay will activate after 14 seconds. The landing gear warning horn will activate. The gear handle light will illuminate. The three green down lights for the gear will extinguish.

C-12 Landing Gear System Review Questions If the pilot raises the landing gear control switch, and the landing gear selector valve fails to operate: The gear will retract normally. The gear will not retract. The timer logic relay will activate after 14 seconds. The landing gear warning horn will activate. The gear handle light will illuminate. The three green down lights for the gear will extinguish.

C-12 Landing Gear System Review Questions The pilot places the gear control switch in the up position. Once the landing gear is fully retracted, the uplock pressure switch fails to operate: The gear will retract normally. The landing gear pump motor will shut down when the gear is fully retracted. The landing gear pump motor will be shut down by the timer logic relay. The landing gear down indicator lights (green) will remain illuminated. The gear relay circuit breaker will open.

C-12 Landing Gear System Review Questions The pilot places the gear control switch in the up position. Once the landing gear is fully retracted, the uplock pressure switch fails to operate: The gear will retract normally. The landing gear pump motor will shut down when the gear is fully retracted. The landing gear pump motor will be shut down by the timer logic relay. The landing gear down indicator lights (green) will remain illuminated. The gear relay circuit breaker will open.

C-12 Landing Gear System Review Questions The parking brake can be set from ____________. The left seat The right seat Either seat The toilet

C-12 Landing Gear System Review Questions The parking brake can be set from ____________. The left seat The right seat Either seat The toilet

C-12 Landing Gear System What is an unsafe gear indication? What would you do if one main gear or the nose gear green light failed to illuminate? What are you going to do if one gear fails to extend? Main Gear Nose Gear What are you going to do if one gear fails to extend after manual extension?

C-12 Landing Gear System Summary System description Normal system operations Emergency system operations Brake system Landing gear warning system Abnormal operations