Systems Flashcards
Landing gear system
The landing gear is electrically activated and hydraulically actuated. The gear system uses an electric 12‐volt, reversible pump to move hydraulic fluid. The hydraulic fluid flows in and out of an actuator that, in turn, raises and lowers the landing gear.
Emergency extension
The emergency extension utilizes a basic hydraulic pressure bypass valve. By turning the valve 90 counterclockwise. The valve is located under the access door on the floor in the front of the pilots sear. When the system pressure is released the gear will free fall into the down and locked position.
The maximum emergency extension speed is 100 KIAS
What is the fuel tank arrangement
The total capacity is 103 gallons with 100 gallons of fuel usable. Each wing has a fuel tank of 51.5 and 50 useable
What is the fuel pump system
two engine‐driven fuel pumps and two electrical fuel pumps. The electric fuel pumps are a backup in case the engine driven pumps fail and are also used when priming the engine. When priming the engine only three of the cylinders are primed; the fourth cylinder, where manifold pressure is measured, is not primed. The electric fuel pumps must be on to prime the engine.
Describe the electrical system
The electrical system is a negative‐ground, dual‐fed, spilt‐bus system. There are two belt‐ driven, 28‐volt, 55 ampere alternators; one mounted on each engine. There is a 30 amp bus tie between the left and right bus
Stall warning
Stall warning vanes are located in the leading edge of both wings. The left wing senses whenever the flaps are above 16 degrees. When the flaps are extended past 16 degrees the right vane will activate the horn
Describe the landing gear safety
A safety pressure switch is installed in the pitot system to deactivate the hydraulic pressure pump circuit when the speed is below 59-63kts
Time delay relay
The landing gear retraction operation is protected by a time delay which will disengage the hydraulic pump motor after 30 seconds of continuous pump operation
Emergency extension
The emergency extension utilizes a basic h valve.
The landing gear is held in the UP position by hydraulic pressure. If that pressure is released, gravity will cause the landing gear to free‐fall to the Down position. While the landing gear is extending, the piston in the hydraulic actuator will move the hydraulic fluid into the extension side of the gear actuators.
The maximum emergency extension speed is 100 KIAS
Gear horn will sound if
The gear handle is up and:
Flaps were lowered below 16 deg
Power below 16-18”
Airspeed pressure switch, 59-63 kts
