Instrument Repair Practice Exam Questions

FAA Repairman Certificate – Avionics & Instrument Repair Practice Exam Questions And Correct Answers (Verified Answers) Plus Rationales 2026 Q&A | Instant Download Pdf

• What is the primary function of a gyro instrument in an aircraft?
• To measure airspeed
• To sense and display aircraft attitude and movement
• To determine altitude
• To indicate engine RPM

Rationale: Gyroscopic instruments provide information about aircraft

attitude, heading, and rate of turn using the principle of rigidity in space.

• What component in an aircraft’s radio system converts audio signals

into radio waves?

• Receiver
• Oscillator 1 / 4

• Transmitter
• Modulator

Rationale: The transmitter converts audio signals into electromagnetic

waves for transmission.

• The pitot-static system provides input to which flight instruments?
• Heading indicator and turn coordinator
• Airspeed indicator, altimeter, and vertical speed indicator
• Attitude indicator, compass, and tachometer
• Rate gyro, attitude gyro, and heading gyro

Rationale: These three instruments rely on air pressure differentials from

the pitot-static system.

• What is the primary purpose of bonding and grounding in avionics

installations?

• Reduce static electricity only
• Prevent electrical noise and ensure safety
• Improve antenna gain
• Increase circuit voltage

Rationale: Proper bonding and grounding reduce EMI, static buildup, and

provide a return path for electrical faults.

• / 4

• Which type of signal is used in modern digital avionics systems?
• Analog signal
• AC signal
• Binary signal
• Frequency-modulated signal

Rationale: Digital systems use binary signals (0s and 1s) to process and

transmit information efficiently.

• What is the function of a synchro system in avionics?
• Provides electrical power to instruments
• Transmits angular data between components
• Converts DC to AC
• Measures airspeed

Rationale: Synchro systems send angular or positional data between

instruments and control systems.

7. The term “glass cockpit” refers to:

• The use of transparent displays
• The use of electronic flight instrument displays instead of analog gauges
• Cockpit made of reinforced glass
• Use of head-up displays only

Rationale: A glass cockpit replaces traditional mechanical instruments with

digital display screens. 3 / 4

• What does ARINC 429 define?
• Radio frequency standards
• Data bus communication standard for avionics
• Hydraulic system design
• Cabin pressurization limits

Rationale: ARINC 429 specifies the data bus standard for digital

communication between avionics components.

• In an autopilot system, what does the servo actuator do?
• Generates navigation commands
• Displays course information
• Moves the control surfaces as directed by the autopilot computer
• Measures airspeed

Rationale: The servo actuator converts electronic commands into

mechanical movement to control the aircraft.

• What type of current is typically used to power aircraft avionics

systems?

• Single-phase AC only
• Three-phase AC only
• DC or AC depending on system design
• / 4