Airframe Mechanic Certification Study Guide 2026
Everything you need to pass the Airframe Mechanic Certification exam in one place: the exam format, every topic to study, real practice questions with explanations, flashcards, and full-length practice tests. Free, no sign-up needed.
📋 Airframe Mechanic Certification Exam Format at a Glance
📚 Airframe Mechanic Certification Topics to Study (24)
✍️ Sample Airframe Mechanic Certification Questions & Answers
1. To verify the integrity of an electrical bond between an equipment rack and the aircraft structure, a technician should use a multimeter to measure for:
Electrical bonding ensures that all conductive parts of the aircraft are at the same electrical potential. A proper bond provides a path of least resistance for fault currents, lightning strikes, and static discharge. A test of a good bond is a measurement of very low resistance (typically in the milliohm range) between the two points.
2. What is 'misfueling' and what is a common serious consequence?
Misfueling means adding the wrong fuel type (e.g., Jet-A into an avgas piston engine), which can cause immediate engine failure, detonation, or serious internal engine damage.
3. When servicing an air/oil oleo shock strut, a mechanic notices that the strut bottoms out on landing but functions normally during taxi. What is the most likely cause of this issue?
If an oleo strut bottoms on landing, it indicates a lack of hydraulic fluid to cushion the initial impact. During taxi, the loads are less severe, so the remaining fluid and air pressure may appear to function correctly. Excessive air pressure would make the strut too stiff, and worn seals would likely cause fluid leaks.
4. During a pre-purchase inspection, a mechanic is reviewing the aircraft's maintenance records. Which of the following is true regarding Airworthiness Directives (ADs)?
Airworthiness Directives (ADs) are legally enforceable regulations issued by the FAA under 14 CFR Part 39 to correct an unsafe condition. Compliance with all applicable ADs is mandatory for an aircraft to be considered airworthy, and this compliance must be properly recorded in the maintenance logs.
5. A technician is performing a flush patch repair on a pressurized fuselage skin. How should the thickness of the doubler and the filler (patch) relate to the original skin thickness?
For a flush patch repair, the filler plug must be of the same gauge and material as the original skin to maintain a smooth surface. The doubler, which provides the structural reinforcement from the inside, should be made of material one gauge heavier (thicker) than the original skin.
6. When fabricating a 90-degree bend in a piece of aluminum sheet metal with a radius of 0.125 inches and a thickness of 0.063 inches, what is the setback?
For a 90-degree bend, the setback is calculated by adding the bend radius to the thickness of the material. In this case, Setback = Radius + Thickness = 0.125" + 0.063" = 0.188". Setback is a critical calculation for determining the starting point of the bend.