ASTM NCATT Autonomous Navigation
Systems (ANS) Endorsement Newest
(2025 - 2026 Update) From Real Past
Papers Questions – A Set Of 100 Most
Common Exam Frequently Tested
Questions And Answers In Details 100%
Verified Exam Highly Recommendable
For Grade A+
1. Which navigation system determines aircraft position without relying on
external navigation signals?
A. VOR
B. DME
C. C. Inertial Navigation System (INS)
D. ILS
Answer: C. Inertial Navigation System (INS)
Explanation: An INS calculates aircraft position using internal accelerometers and
gyroscopes without requiring external navigation aids.
2. The primary purpose of a vertical gyro is to provide:
A. Airspeed information
B. B. Aircraft pitch and roll attitude
, C. Fuel quantity
D. Engine RPM
Answer: B. Aircraft pitch and roll attitude
Explanation: A vertical gyro provides attitude information essential for flight
instruments.
3. A slaved compass system automatically:
A. Calculates airspeed
B. Measures altitude
C. C. Corrects heading errors using a magnetic sensor
D. Controls the autopilot
Answer: C. Corrects heading errors using a magnetic sensor
Explanation: The magnetic detector continuously corrects gyro drift.
4. Gyroscopic rigidity refers to a gyro's tendency to:
A. Increase speed
B. Stop rotating
C. C. Maintain its plane of rotation
D. Change direction automatically
Answer: C. Maintain its plane of rotation
Explanation: Rigidity in space is the basic operating principle of gyroscopes.
5. INS position accuracy depends primarily upon:
A. Fuel flow
B. Cabin pressure
C. C. Sensor accuracy and drift
D. Battery voltage
Answer: C. Sensor accuracy and drift
Explanation: Small sensor errors accumulate over time, producing drift.
6. Which component measures linear acceleration in an INS?
A. Resolver
, B. Flux valve
C. C. Accelerometer
D. Servo motor
Answer: C. Accelerometer
Explanation: Accelerometers detect acceleration along specific axes.
7. A heading reference system provides:
A. Cabin altitude
B. Weather radar
C. C. Aircraft heading information
D. Engine thrust
Answer: C. Aircraft heading information
Explanation: Heading systems provide directional information for pilots and
avionics.
8. Which law explains gyroscopic precession?
A. Boyle's Law
B. Ohm's Law
C. Newton's Second Law
D. D. Applied force appears 90 degrees later in rotation
Answer: D. Applied force appears 90 degrees later in rotation
Explanation: Gyroscopic precession causes applied forces to appear 90° ahead in
the direction of rotation.
9. A ring laser gyro measures rotation using:
A. Magnetic fields
B. Pressure sensors
C. C. Interference of laser beams
D. Mechanical gears
Answer: C. Interference of laser beams
Explanation: Ring laser gyros detect rotational motion using laser interference.
Systems (ANS) Endorsement Newest
(2025 - 2026 Update) From Real Past
Papers Questions – A Set Of 100 Most
Common Exam Frequently Tested
Questions And Answers In Details 100%
Verified Exam Highly Recommendable
For Grade A+
1. Which navigation system determines aircraft position without relying on
external navigation signals?
A. VOR
B. DME
C. C. Inertial Navigation System (INS)
D. ILS
Answer: C. Inertial Navigation System (INS)
Explanation: An INS calculates aircraft position using internal accelerometers and
gyroscopes without requiring external navigation aids.
2. The primary purpose of a vertical gyro is to provide:
A. Airspeed information
B. B. Aircraft pitch and roll attitude
, C. Fuel quantity
D. Engine RPM
Answer: B. Aircraft pitch and roll attitude
Explanation: A vertical gyro provides attitude information essential for flight
instruments.
3. A slaved compass system automatically:
A. Calculates airspeed
B. Measures altitude
C. C. Corrects heading errors using a magnetic sensor
D. Controls the autopilot
Answer: C. Corrects heading errors using a magnetic sensor
Explanation: The magnetic detector continuously corrects gyro drift.
4. Gyroscopic rigidity refers to a gyro's tendency to:
A. Increase speed
B. Stop rotating
C. C. Maintain its plane of rotation
D. Change direction automatically
Answer: C. Maintain its plane of rotation
Explanation: Rigidity in space is the basic operating principle of gyroscopes.
5. INS position accuracy depends primarily upon:
A. Fuel flow
B. Cabin pressure
C. C. Sensor accuracy and drift
D. Battery voltage
Answer: C. Sensor accuracy and drift
Explanation: Small sensor errors accumulate over time, producing drift.
6. Which component measures linear acceleration in an INS?
A. Resolver
, B. Flux valve
C. C. Accelerometer
D. Servo motor
Answer: C. Accelerometer
Explanation: Accelerometers detect acceleration along specific axes.
7. A heading reference system provides:
A. Cabin altitude
B. Weather radar
C. C. Aircraft heading information
D. Engine thrust
Answer: C. Aircraft heading information
Explanation: Heading systems provide directional information for pilots and
avionics.
8. Which law explains gyroscopic precession?
A. Boyle's Law
B. Ohm's Law
C. Newton's Second Law
D. D. Applied force appears 90 degrees later in rotation
Answer: D. Applied force appears 90 degrees later in rotation
Explanation: Gyroscopic precession causes applied forces to appear 90° ahead in
the direction of rotation.
9. A ring laser gyro measures rotation using:
A. Magnetic fields
B. Pressure sensors
C. C. Interference of laser beams
D. Mechanical gears
Answer: C. Interference of laser beams
Explanation: Ring laser gyros detect rotational motion using laser interference.
