Question

The undercarriage of a commercial aircraft has three positions and there is an indication for each undercarriage. First, it is retracted, doors closed and locked in position, and there is no light indication in the cockpit. In the second position, the undercarriage is down and locked; this is shown as a green light in the cockpit for each undercarriage. When a red light shows then that undercarriage is neither up or down, but most importantly it is not locked in position. Assume that, initially, the airplane is on the ground at the departure gate. Describe the light's status in all stages from start of take-off to parking at the terminal after a flight. Describe for one of the following airplanes (A320, A340 or B747). In addition, at any stage of flight (you may decide at which stage) any of the undercarriages failed to respond to the input signal from the pilot. Identify the data types of variables and constants needed to simulate the process you described. Fully justify your selections and reasoning.

Answer 1

At the start of the take off of airplane there is required undercarriage for the door retraction and closing. The opening of the door is done at the normal condition when airplane is not started to take the flight. This is not any critical activity so it is not shown by any light indication It is very necessary that the doors of airplane are locked properly to maintain the desired atmospheric pressure and comfort conditions. If it is not s, it will damage the plane components by creating a potential force due to pressure difference If the light shown is green then the door is properly locked. If the light is red, the position of undercariage is not the required one In order to simulate this, it is required to check the proper position of the doors. It will done by mounting linear position sensors that will detect the actual position with a closed loop feedback system To identify any air leakage pressure sensors are mounted inside the airplane It will help to give the proper pressure variations. If the pressure is fluctuating at a very faster rate then need to identify the position of door The constants that required the pressure difference, the temperature are are reading inside the airplene, the maximum distance of orientation etc