Project 2 - Implement the Code for controlling the retraction and extension of Airplane’s landing gear

Project 2 - Implement the Code for controlling the retraction and extension of Airplane’s landing gear.

Ans -

Aim - Create a c program for Implement the Code for controlling the retraction and extension of Airplane’s landing gear.

Procedure -

1) Create a .c program file foreach function.

2) Write a code and run it

3) Run the code and get the output on console.

LANDING GEAR SYSTEMS

An electrical landing gear retraction system utilizes an electrically driven motor for gear operation. The system is basically an electrically driven jack for raising and lowering the gear. When a switch in the cockpit is moved to the UP position, the electric motor operates. Through a system of shafts, gears, adapters, an actuator screw, and a torque tube, a force is transmitted to the drag strut linkages. Thus, the gear retracts and locks. Struts are also activated that open and close the gear doors. If the switch is moved to the DOWN position, the motor reverses and the gear moves down and locks. Once activated the gear motor will continue to operate until an up or down limit switch on the motor’s gearbox is tripped.

A hydraulic landing gear retraction system utilizes pressurized hydraulic fluid to actuate linkages to raise and lower the gear. When a switch in the cockpit is moved to the UP position, hydraulic fluid is directed into the gear up line. The fluid flows through sequenced valves and downlocks to the gear actuating cylinders. A similar process occurs during gear extension. The pump which pressurizes the fluid in the system can be either engine driven or electrically powered. If an electrically powered pump is used to pressurize the fluid, the system is referred to as an electrohydraulic system. The system also incorporates a hydraulic reservoir to contain excess fluid, and to provide a means of determining system fluid level.

Regardless of its power source, the hydraulic pump is designed to operate within a specific range. When a sensor detects excessive pressure, a relief valve within the pump opens, and hydraulic pressure is routed back to the reservoir. Another type of relief valve prevents excessive pressure that may result from thermal expansion. Hydraulic pressure is also regulated by limit switches. Each gear has two limit switches—one dedicated to extension and one dedicated to retraction. These switches de-energize the hydraulic pump after the landing gear has completed its gear cycle. In the event of limit switch failure, a backup pressure relief valve activates to relieve excess system pressure.

OUTPUT -

State Machine is initialized & Program is in Gear_Down_state & Light_Status:Green

Enter the pilot's Lever Position, Squat Switch Status

State Machine is initialized & Program is in Gear_Down_state & Light_Status:Green

Enter the pilot's Lever Position, Squat Switch Status 0 0

Current State:Checking Before Take Off

Light State: Green
Enter the pilot's lever Position, Squat Switch Status and Hydraulic Mechanism Status: