c12u Landing Gear

CC--12T2/U Landing Gear 12T2/U Landing Gear SystemSystemLanding GearLanding Gear

Terminal Learning ObjectiveTerminal Learning Objective

Action:Action: Identify the subsystems of the C-12T2/U Identify the subsystems of the C-12T2/U landing gear system and explain the basic operating landing gear system and explain the basic operating principles.principles.

ConditionCondition: Using student handout and classroom : Using student handout and classroom notes.notes.

Standard:Standard: IAW the IGRV SEP IAW the IGRV SEP

SAFETY REQUIREMENTS:SAFETY REQUIREMENTS: NONENONE

RISK ASSESSMENT LEVEL:RISK ASSESSMENT LEVEL:IV, D, LOWIV, D, LOW

ENVIRONMENTAL CONSIDERATIONS:ENVIRONMENTAL CONSIDERATIONS: NO IMPACTNO IMPACT

C-12T2/U Landing Gear System C-12T2/U Landing Gear System DescriptionDescription

Electrically ActivatedElectrically Activated

Switches, relays, electrically powered Switches, relays, electrically powered valves are actuated when the landing gear valves are actuated when the landing gear switch is moved in the cockpitswitch is moved in the cockpit

Hydraulically OperatedHydraulically Operated

Pressurized fluid is moved to the Pressurized fluid is moved to the landing gear hydraulic actuators to raise and landing gear hydraulic actuators to raise and lower the landing gear.lower the landing gear.

C-12 Landing Gear System C-12 Landing Gear System Cockpit SwitchesCockpit Switches

C-12 Landing Gear System Fill C-12 Landing Gear System Fill ReservoirReservoir

C-12 Landing Gear System Fluid C-12 Landing Gear System Fluid Level DipstickLevel Dipstick

C-12 Landing Gear System Main C-12 Landing Gear System Main ReservoirReservoir

C-12 Landing Gear System C-12 Landing Gear System Reservoir / Power PackReservoir / Power Pack

C-12 Landing Gear System C-12 Landing Gear System AccumulatorAccumulator

C-12 Landing Gear System C-12 Landing Gear System DescriptionDescription

3 lines from the pump to each gear actuator3 lines from the pump to each gear actuator

Retraction (becomes return line during Retraction (becomes return line during extension)extension)

Extension (becomes return line during Extension (becomes return line during retraction)retraction)

EmergencyEmergency

Gear are held up with hydraulic pressureGear are held up with hydraulic pressure

2474 psi to 2775 psi2474 psi to 2775 psi

Gear are held down with over-center locksGear are held down with over-center locks

C-12 Landing Gear System C-12 Landing Gear System Retraction OperationsRetraction Operations

C-12 Landing Gear System C-12 Landing Gear System Extension OperationsExtension Operations

C-12 Landing Gear System C-12 Landing Gear System Emergency Extension OperationsEmergency Extension Operations

C-12 Landing Gear System C-12 Landing Gear System Check ValvesCheck Valves

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

C-12 Landing Gear System C-12 Landing Gear System Turning LimitsTurning Limits

C-12 Landing Gear System C-12 Landing Gear System Crush BlockCrush Block

C-12 Landing Gear System Nose C-12 Landing Gear System Nose Gear Torque KneeGear Torque Knee

C-12 Landing Gear System C-12 Landing Gear System Shimmy DampnerShimmy Dampner

C-12 Landing Gear System Main C-12 Landing Gear System Main Gear Drag BraceGear Drag Brace

C-12 Landing Gear System Main C-12 Landing Gear System Main Gear Down LockGear Down Lock

C-12 Landing Gear System Main C-12 Landing Gear System Main Gear DoorGear Door

C-12 Landing Gear System Main C-12 Landing Gear System Main Gear Torque KneeGear Torque Knee

C-12 Landing Gear System C-12 Landing Gear System Safety SwitchSafety Switch

C-12 Landing Gear System C-12 Landing Gear System Brake Fluid ReservoirBrake Fluid Reservoir

C-12 Landing Gear System Main C-12 Landing Gear System Main BrakesBrakes

C-12 Landing Gear System Pilot C-12 Landing Gear System Pilot BrakesBrakes

C-12 Landing Gear System Co-C-12 Landing Gear System Co-Pilot BrakesPilot Brakes

C-12 Landing Gear System C-12 Landing Gear System Parking Brake SetParking Brake Set

C-12 Landing Gear System C-12 Landing Gear System Landing Gear Warning HornLanding Gear Warning Horn

C-12 Landing Gear SystemC-12 Landing Gear System

Questions??????????

C-12 Landing Gear SystemC-12 Landing Gear System

C-12 Landing Gear SystemC-12 Landing Gear SystemReview QuestionsReview Questions

The landing gear are help in the position with The landing gear are help in the position with ____________ and are held down with ____________ and are held down with ____________.____________.

C-12 Landing Gear SystemC-12 Landing Gear SystemReview QuestionsReview Questions

The landing gear are help in the position with The landing gear are help in the position with hydraulic pressurehydraulic pressure and are held down with and are held down with over-over-center lockscenter locks..

C-12 Landing Gear System C-12 Landing Gear System Review QuestionsReview 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.

TRUE or FALSE


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


The timer logic relay in the landing gear system will activate after the gear motor has been operating for ________.


The timer logic relay in the landing gear system will activate after the gear motor has been operating for 14 seconds.


The timer logic relay activates for gear retraction operations only.

TRUE or FALSE


The timer logic relay activates for gear retraction operations only.

FALSE


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.


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.


The parking brake can be set from ____________.

The left seat

The right seat

Either seat

The toilet

C-12 Landing Gear System C-12 Landing Gear System What is an unsafe gear indication?What is an unsafe gear indication?

What would you do if one main gear or the nose gear What would you do if one main gear or the nose gear green light failed to illuminate?green light failed to illuminate?

What are you going to do if one gear fails to extend?What are you going to do if one gear fails to extend?

Main GearMain Gear

Nose GearNose Gear

What are you going to do if one gear fails to extend after What are you going to do if one gear fails to extend after manual extension?manual extension?

Nose GearNose Gear

Main GearMain Gear

C-12 Landing Gear System C-12 Landing Gear System SummarySummary

System descriptionSystem description

Normal system operationsNormal system operations

Emergency system operationsEmergency system operations

Brake systemBrake system

Landing gear warning systemLanding gear warning system

Abnormal operationsAbnormal operations

c12u Landing Gear

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