Airframe ASA/Baker's School FAA Oral Questions and Answers 100% Accurate!

What are three requirements for a repair to a piece of sheet metal aircraft structure? - ANSWER-The repair must restore the lost a) strength, b) rigidity, and c) aerodynamic shape must not change. When making a riveted repair to an aircraft sheet metal structure, which should be stronger, the shear strength of the rivet, or the bearing strength of the metal sheet? - ANSWER-The two strengths should be close to each other, but the bearing strength of the sheet should be greater. What kind of stress is in the upper skin of an aircraft in flight? - ANSWER-compression What type of device is a Cleco fastener? - ANSWER-A patented fastener that is inserted into the rivet holes and is used to hold the two pieces of sheet metal together until they can be riveted. What is the main function of throatless shears in an aircraft sheet metal shop? - ANSWER-Throatless shears are used to cut mild carbon steel up to 10-gauge, and stainless steel up to 12 gauge. They cut irregular curves in the metal. What is the purpose of a sight line when laying out sheet metal to be bent in a cornice brake? - ANSWER-The sight line allows the jaws of the cornice brake to be positioned so the bend made by the brake will start at the bend tangent line. What kind of metal forming is done by a slip roll former? - ANSWER-simple curves with a large radius What kind of metal forming is done by bumping? - ANSWER-compound curves in sheet metal What must be done to the flanges of an angle for it to be curved? - ANSWER-The flanges must be stretched for a convex curve and shrunk for a concave curve. What is meant by the bend allowance used in making a bend in a piece of sheet metal? - ANSWER-actual amount of metal used in making the bend What determines the minimum bend radius that can be used with a piece of sheet metal? (2) - ANSWER-thickness hardness What is meant by setback when bending a piece of sheet metal in a cornice brake. - ANSWER-Setback is the distance the jaws of the brake must be set back from the mold line to form the bend. Why are the lightening holes in a sheet metal wing rib flanged? - ANSWER-Flanging the lightening holes gives the rib rigidity. When hand forming a piece of sheet metal that has a concave curve, should the forming be started in the center of the curve or at its edges? - ANSWER-Start at the edges and work inward toward the center. What is meant by a joggle in piece of sheet metal? - ANSWER-A joggle is a small offset near the edge of a piece of sheet metal that allows the sheet to overlap another piece of metal. When drilling stainless steel, should the drill be turned fast or slow? - ANSWER-slow