AIRFRAME PREPWARE STUDY
GUIDE 2026 TEST PAPER
QUESTIONS AND SOLUTIONS
GRADED A+
◉ (Refer to Figure 5.) What is the flat layout dimension? Answer: 6.8
inches
Explanation: The dimension of flat A is 3.688 inches.
The dimension of flat B is 2.688 inches.
Using the bend allowance formula, we find that 0.441 inch of material is
used to make the bend.
The total layout dimension is 3.688 + 2.688 + 0.441 = 6.817 inches.
◉ Mild steel rivets are used for riveting Answer: steel parts
◉ (Refer to Figure 2.) Select the preferred drawing for proper
countersinking. Answer: 1.
Explanation: The type of countersinking shown in view 1 is preferred.
The type of countersinking shown in view 2 is acceptable.
The type of countersinking shown in view 3 is not acceptable.
,◉ Clad aluminum alloys are used in aircraft because they Answer: have
surface layers of pure aluminum or aluminum alloy bonded to the core
material to inhibit corrosion.
◉ Cylinders used to transport and store acetylene Answer: contain
acetone in which the acetylene gas is dissolved.
When acetylene gas is dissolved in acetone, it can safely be stored under
pressure.
◉ When welding or cutting, the acetylene pressure gauge should never
be set higher than Answer: 15 psi
◉ When bending metal, the material on the outside of the curve
stretches while the material on the inside of the curve compresses. That
part of the material which is not affected by either stress is the Answer:
neutral line.
◉ Which of the following can normally be welded without adversely
affecting strength? Answer: SAE 4130 chrome/molybdenum tubing.
◉ Engine mount members should preferably be repaired by using a
Answer: larger diameter tube with fishmouth and rosette welds.
◉ A DD rivet is heat treated before use to Answer: soften to facilitate
riveting.
, ◉ When a piece of aluminum alloy is to be bent using a minimum radius
for the type and thickness of material, Answer: the layout should be
made so that the bend will be 90° to the grain of the sheet.
◉ The identifying marks on the heads of aluminum alloy rivets indicate
the Answer: specific alloy used in the manufacture of the rivets.
◉ What is the minimum edge distance allowed for aluminum alloy
single lap sheet splices containing a single row of rivets as compared to
a joint with multiple rows, all rivets being equal in diameter? Answer:
The minimum edge distance for the single row is equal to that for the
multiple row.
◉ What method of repair is recommended for a steel tube longeron
dented at a cluster? Answer: Welded patch plate.
◉ Annealing of aluminum Answer: removes stresses caused by forming.
◉ The oxyacetylene flame used for aluminum welding should Answer:
be neutral and soft.
◉ Which rivet is used for riveting nickel-steel alloys? Answer: Monel.
◉ (Refer to Figure 4.) The amount of material required to make the 90°
bend is Answer: .3434 inch.
GUIDE 2026 TEST PAPER
QUESTIONS AND SOLUTIONS
GRADED A+
◉ (Refer to Figure 5.) What is the flat layout dimension? Answer: 6.8
inches
Explanation: The dimension of flat A is 3.688 inches.
The dimension of flat B is 2.688 inches.
Using the bend allowance formula, we find that 0.441 inch of material is
used to make the bend.
The total layout dimension is 3.688 + 2.688 + 0.441 = 6.817 inches.
◉ Mild steel rivets are used for riveting Answer: steel parts
◉ (Refer to Figure 2.) Select the preferred drawing for proper
countersinking. Answer: 1.
Explanation: The type of countersinking shown in view 1 is preferred.
The type of countersinking shown in view 2 is acceptable.
The type of countersinking shown in view 3 is not acceptable.
,◉ Clad aluminum alloys are used in aircraft because they Answer: have
surface layers of pure aluminum or aluminum alloy bonded to the core
material to inhibit corrosion.
◉ Cylinders used to transport and store acetylene Answer: contain
acetone in which the acetylene gas is dissolved.
When acetylene gas is dissolved in acetone, it can safely be stored under
pressure.
◉ When welding or cutting, the acetylene pressure gauge should never
be set higher than Answer: 15 psi
◉ When bending metal, the material on the outside of the curve
stretches while the material on the inside of the curve compresses. That
part of the material which is not affected by either stress is the Answer:
neutral line.
◉ Which of the following can normally be welded without adversely
affecting strength? Answer: SAE 4130 chrome/molybdenum tubing.
◉ Engine mount members should preferably be repaired by using a
Answer: larger diameter tube with fishmouth and rosette welds.
◉ A DD rivet is heat treated before use to Answer: soften to facilitate
riveting.
, ◉ When a piece of aluminum alloy is to be bent using a minimum radius
for the type and thickness of material, Answer: the layout should be
made so that the bend will be 90° to the grain of the sheet.
◉ The identifying marks on the heads of aluminum alloy rivets indicate
the Answer: specific alloy used in the manufacture of the rivets.
◉ What is the minimum edge distance allowed for aluminum alloy
single lap sheet splices containing a single row of rivets as compared to
a joint with multiple rows, all rivets being equal in diameter? Answer:
The minimum edge distance for the single row is equal to that for the
multiple row.
◉ What method of repair is recommended for a steel tube longeron
dented at a cluster? Answer: Welded patch plate.
◉ Annealing of aluminum Answer: removes stresses caused by forming.
◉ The oxyacetylene flame used for aluminum welding should Answer:
be neutral and soft.
◉ Which rivet is used for riveting nickel-steel alloys? Answer: Monel.
◉ (Refer to Figure 4.) The amount of material required to make the 90°
bend is Answer: .3434 inch.
