FAA Airframe Mechanic Knowledge
Exam Practice Questions And Correct
Answers (Verified Answers) Plus
Rationale 2027 Q&A| Instant Download
Pdf.
1. During aircraft maintenance, which FAA-approved document is the
primary source for determining the manufacturer’s specified
procedures, limitations, inspections, and servicing requirements for a
particular aircraft model?
A. Airworthiness Directive summary
B. Aircraft maintenance manual
C. Federal Aviation Regulations
D. Pilot’s operating handbook
The aircraft maintenance manual provides the manufacturer’s detailed
procedures for inspection, maintenance, servicing, troubleshooting, and
repair of the specific aircraft. Regulatory requirements and ADs must also
be followed, but they do not replace the manufacturer’s maintenance
procedures.
2. Which type of corrosion occurs when two dissimilar metals are in
electrical contact in the presence of an electrolyte?
,A. Intergranular corrosion
B. Exfoliation corrosion
C. Galvanic corrosion
D. Fretting corrosion
Galvanic corrosion results from electrochemical interaction between
dissimilar metals when an electrolyte permits current flow between them.
The less noble metal generally becomes the anode and corrodes more
rapidly.
3. What is the principal purpose of a torque wrench when installing an
aircraft fastener?
A. To determine the thread pitch
B. To prevent all future loosening
C. To apply the specified tightening torque
D. To determine the tensile strength of the fastener
A torque wrench allows the mechanic to apply the manufacturer-specified
torque to a fastener. Correct torque is essential because insufficient or
excessive tightening can weaken a joint or damage the structure.
4. When inspecting an aluminum aircraft structure for cracks, which
method is particularly effective for detecting surface and slightly
subsurface discontinuities in electrically conductive materials?
A. Magnetic particle inspection
B. Eddy current inspection
C. Radiographic inspection
D. Ultrasonic thickness inspection
Eddy current inspection is well suited to electrically conductive materials
such as aluminum and can detect surface and near-surface cracks,
including flaws around fastener holes.
5. What is the primary purpose of a safety wire installed on an aircraft
fastener?
,A. To increase the tensile strength of the fastener
B. To provide electrical bonding
C. To prevent the fastener from rotating in the loosening direction
D. To compensate for incorrect torque
Safety wire is a secondary locking method designed to prevent rotation
that could loosen the fastener. It does not substitute for proper torque or
correct installation procedures.
6. Which statement correctly describes the function of a circuit breaker
in an aircraft electrical system?
A. It increases circuit voltage during heavy loads
B. It regulates generator frequency
C. It opens the circuit when excessive current flows
D. It converts alternating current into direct current
A circuit breaker protects wiring and electrical components by opening the
circuit when current exceeds its rated value for a sufficient period.
7. What is the primary function of an aircraft battery in a typical
electrical system?
A. To continuously supply all aircraft electrical loads during normal flight
B. To regulate engine oil pressure
C. To provide electrical power for starting and emergency or standby
requirements
D. To increase generator output voltage
Aircraft batteries commonly provide starting power and serve as an
electrical source when generators or alternators are unavailable. Their
exact role depends on the aircraft’s electrical design.
8. Which instrument is used to measure electrical resistance?
A. Ammeter
B. Voltmeter
, C. Wattmeter
D. Ohmmeter
An ohmmeter measures resistance in ohms. The circuit being tested should
normally be de-energized before resistance measurements are made.
9. What is the basic relationship between voltage, current, and
resistance described by Ohm’s law?
A. V = I/R
B. R = V × I
C. V = I × R
D. I = V × R
Ohm’s law states that voltage equals current multiplied by resistance. This
relationship is fundamental to aircraft electrical troubleshooting and
circuit analysis.
10. Which material is commonly used for aircraft control cables
because of its favorable strength, flexibility, and corrosion resistance?
A. Cast iron
B. Corrosion-resistant steel
C. Pure aluminum
D. Magnesium alloy
Aircraft control cables are commonly manufactured from corrosion-
resistant steel wire because it provides the required strength and flexibility
while resisting environmental deterioration.
11. What is the purpose of a turnbuckle in an aircraft flight-control
cable system?
A. To absorb control-system vibration
B. To prevent cable corrosion
C. To adjust cable tension
D. To increase control-surface area
Exam Practice Questions And Correct
Answers (Verified Answers) Plus
Rationale 2027 Q&A| Instant Download
Pdf.
1. During aircraft maintenance, which FAA-approved document is the
primary source for determining the manufacturer’s specified
procedures, limitations, inspections, and servicing requirements for a
particular aircraft model?
A. Airworthiness Directive summary
B. Aircraft maintenance manual
C. Federal Aviation Regulations
D. Pilot’s operating handbook
The aircraft maintenance manual provides the manufacturer’s detailed
procedures for inspection, maintenance, servicing, troubleshooting, and
repair of the specific aircraft. Regulatory requirements and ADs must also
be followed, but they do not replace the manufacturer’s maintenance
procedures.
2. Which type of corrosion occurs when two dissimilar metals are in
electrical contact in the presence of an electrolyte?
,A. Intergranular corrosion
B. Exfoliation corrosion
C. Galvanic corrosion
D. Fretting corrosion
Galvanic corrosion results from electrochemical interaction between
dissimilar metals when an electrolyte permits current flow between them.
The less noble metal generally becomes the anode and corrodes more
rapidly.
3. What is the principal purpose of a torque wrench when installing an
aircraft fastener?
A. To determine the thread pitch
B. To prevent all future loosening
C. To apply the specified tightening torque
D. To determine the tensile strength of the fastener
A torque wrench allows the mechanic to apply the manufacturer-specified
torque to a fastener. Correct torque is essential because insufficient or
excessive tightening can weaken a joint or damage the structure.
4. When inspecting an aluminum aircraft structure for cracks, which
method is particularly effective for detecting surface and slightly
subsurface discontinuities in electrically conductive materials?
A. Magnetic particle inspection
B. Eddy current inspection
C. Radiographic inspection
D. Ultrasonic thickness inspection
Eddy current inspection is well suited to electrically conductive materials
such as aluminum and can detect surface and near-surface cracks,
including flaws around fastener holes.
5. What is the primary purpose of a safety wire installed on an aircraft
fastener?
,A. To increase the tensile strength of the fastener
B. To provide electrical bonding
C. To prevent the fastener from rotating in the loosening direction
D. To compensate for incorrect torque
Safety wire is a secondary locking method designed to prevent rotation
that could loosen the fastener. It does not substitute for proper torque or
correct installation procedures.
6. Which statement correctly describes the function of a circuit breaker
in an aircraft electrical system?
A. It increases circuit voltage during heavy loads
B. It regulates generator frequency
C. It opens the circuit when excessive current flows
D. It converts alternating current into direct current
A circuit breaker protects wiring and electrical components by opening the
circuit when current exceeds its rated value for a sufficient period.
7. What is the primary function of an aircraft battery in a typical
electrical system?
A. To continuously supply all aircraft electrical loads during normal flight
B. To regulate engine oil pressure
C. To provide electrical power for starting and emergency or standby
requirements
D. To increase generator output voltage
Aircraft batteries commonly provide starting power and serve as an
electrical source when generators or alternators are unavailable. Their
exact role depends on the aircraft’s electrical design.
8. Which instrument is used to measure electrical resistance?
A. Ammeter
B. Voltmeter
, C. Wattmeter
D. Ohmmeter
An ohmmeter measures resistance in ohms. The circuit being tested should
normally be de-energized before resistance measurements are made.
9. What is the basic relationship between voltage, current, and
resistance described by Ohm’s law?
A. V = I/R
B. R = V × I
C. V = I × R
D. I = V × R
Ohm’s law states that voltage equals current multiplied by resistance. This
relationship is fundamental to aircraft electrical troubleshooting and
circuit analysis.
10. Which material is commonly used for aircraft control cables
because of its favorable strength, flexibility, and corrosion resistance?
A. Cast iron
B. Corrosion-resistant steel
C. Pure aluminum
D. Magnesium alloy
Aircraft control cables are commonly manufactured from corrosion-
resistant steel wire because it provides the required strength and flexibility
while resisting environmental deterioration.
11. What is the purpose of a turnbuckle in an aircraft flight-control
cable system?
A. To absorb control-system vibration
B. To prevent cable corrosion
C. To adjust cable tension
D. To increase control-surface area
