Aircraft Component Repair Frequently Asked Questions
Nancy asks…
What is the most difficult commercial aircraft to control in bad weather?
Actually, what type of aircraft, when you get into some heavy wx, winds, rain/snow etc. do you say, “this aircraft is a pig in this type of weather” difficult to handle, constantly needs trim change, etc. also, which type handles the best in bad weather, needs little correction, handles well.. Just curious.
admin answers:
I’d think the Concorde would be the easiest due to its high wing loading and unstallable airframe.
Laura asks…
How will pilot of aircraft know if navigation light are working or not?
Think, an aircraft is flying in its path at that time navigation light of aircraft stops working,so how pilot will notice that? ANSWER with sources because it is not possible to see it through cockpit.
admin answers:
In fact civil aircraft are not required navigation lights during the daylight hours. Pilots are required to preflight their planes before flight. If the lights work before take off it is legal to proceed. If they fail during the flight this is an item to be repaired before the next nigh time flight. For may non commercial planes there is a plastic piece installed by the light that reflects its light, green on the right/starboard side and red on the left/portside location. This system was copied from maritime light requirements. With today’s strobe/anticollision lights being electronic and brighter than the ancient rotating beacons of decades ago, the position lights are almost an anachronism. These wing tip lights are difficult to see at night anyway. Combined with the higher speeds of planes today by the time you see them you would have spotted the anticollision lights many miles prior. For further and specific references you need to read the Airman’s Information Manual. Best of luck.
Joseph asks…
Where does the aircraft hydraulic fluid go from the actuator during emergency application?
is it overboard, reservoir or depend on aircraft system design?
admin answers:
Reservoir on board.
Donald asks…
How is a Aircraft Load Balance Graph drawn or computed?
Balance Graph is a allowed Center of gravity range envelope plotted by Aircraft Weight in y-axis against the Center of Gravity in x-axis.
This is used to find whether the actual Center of gravity is within the allowed range as defined by the balance graph.
John is absolutely right in whatever he had explained. Thanks John.. but we are done with that part.
The information am looking for is… on what basis the Balance Graph has been defined by the manufacturer? What is the fundamentals behind it… I mean how the lines forming the Balance Graph Polygon is arrived for different Aircraft Models and for Different Weights?
admin answers:
You’ve asked a question that takes about a week to explain. I’ll not get into the details but basically there is a center of gravity envelope that the cg must fall into before takeoff. This envelope has two axis as you suggest, weight and moment arm. You begin with the basic operating weight or for a light aircraft the empty weight and the BOW cg or empty weight cg. Then as you load things, passengers or cargo, they end up at some aircraft station which is a point measured in inches from the datum. The length of this station from the datum in inches is the arm. Multiply the weight of the object time this arm and you get a moment. You do this with each item or person you load. When you are loaded up, add up all of the moments that you calculated and add that total to the empty weight or BOW moment. Now you have the total moment to plot on the X axis. Next add up all of the weights of things that you loaded and add that to the BOW or empty weight and you now have the total weight of the aircraft with it’s load. This is the zero fuel weight. Add in the weight of the fuel using the same principal and you now have the ramp weight and center of gravity. After taxiing out to the runway, you will now be at the takeoff weight and cg moment and hopefully that falls within the forward and aft limits of the cg envelope and ofcourse below the max takeoff weight. There’s more to it but that’s it in a nutshell. I don’t have a week to kill.
David asks…
Why do new aircraft designs appear so rarely?
Pre WWII DC3s are still in use. Many other commonly used aircraft types like F27s, Boeing 737s, Cessna 150s and 172s are decades old, yet you see very few vintage cars on the road. Silly question but what’s the difference?
admin answers:
The major designs changes are in the wings and jet engines. Swept wings was a major change in the 1950′s like with the B-52 and the other jet aircraft. But Manufactures are always improving wing efficiency whether by winglets or swept back wings. You will always see when a newer version of plane comes out it has better avionics, more power, better efficeincy and you will always hear a number like a 4% increase of wing efficiency.
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