EFD TRAINING FINAL EXAM
(ELECTRONIC FLIGHT DISPLAYS)
QUESTIONS WITH CORRECT
DETAILED ANSWERS LATEST UPDATE
THIS YEAR
1. Which Line Replaceable Unit (LRU) is primarily responsible for processing pitot-static data
and outside air temperature to provide airspeed, altitude, and vertical speed?
A. AHRS (Attitude and Heading Reference System)
B. ADC (Air Data Computer)
C. IAU (Integrated Avionics Unit)
D. GEA (Garmin Engine/Airframe Unit)
Answer: B
Conceptual Explanation: The Air Data Computer (ADC) processes information from the
pitot-static system and the OAT probe to calculate flight parameters like airspeed and
altitude.
2. In the event of a total AHRS failure, which of the following information will be lost on the
PFD?
A. Airspeed and Altimeter tapes
,B. Vertical Speed and OAT
C. Attitude Indicator and Heading Bug
D. Engine Manifold Pressure and RPM
Answer: C
Conceptual Explanation: The AHRS provides attitude, rate of turn, and slip/skid
information. Losing it results in the loss of the horizon (Attitude) and directional
information.
3. What does a magenta line extending from the current airspeed on the airspeed tape
represent?
A. The target airspeed set in the flight director
B. Airspeed trend vector showing predicted airspeed in 6 seconds
C. The maximum structural cruising speed (Vno)
D. Minimum controllable airspeed (Vmc)
Answer: B
Conceptual Explanation: The airspeed trend vector indicates what the airspeed will be in
6 seconds if the current rate of acceleration or deceleration is maintained.
4. Which sensor technology is commonly used within an AHRS to determine rotation rates
without a mechanical gyroscope?
A. MEMS (Micro-Electro-Mechanical Systems) accelerometers and tilt sensors
, B. Aneroid wafers
C. Vortex generators
D. Magnetic float sensors
Answer: A
Conceptual Explanation: Modern AHRS units use MEMS technology, including solid-state
accelerometers and rate sensors, to calculate aircraft attitude.
5. If the PFD screen fails completely, what mechanism allows the flight data to be displayed
on the MFD?
A. Manual cross-fill
B. Automatic Synchronization Mode
C. Standby Instrument Override
D. Reversionary Mode
Answer: D
Conceptual Explanation: Reversionary mode (or composite mode) displays a combined
PFD/MFD format on the remaining functional screen in the event of a display failure.
6. How is the slip/skid indicator represented on a standard Glass Cockpit PFD?
A. A physical ball in a liquid-filled tube
B. A circular icon on the wind vector
(ELECTRONIC FLIGHT DISPLAYS)
QUESTIONS WITH CORRECT
DETAILED ANSWERS LATEST UPDATE
THIS YEAR
1. Which Line Replaceable Unit (LRU) is primarily responsible for processing pitot-static data
and outside air temperature to provide airspeed, altitude, and vertical speed?
A. AHRS (Attitude and Heading Reference System)
B. ADC (Air Data Computer)
C. IAU (Integrated Avionics Unit)
D. GEA (Garmin Engine/Airframe Unit)
Answer: B
Conceptual Explanation: The Air Data Computer (ADC) processes information from the
pitot-static system and the OAT probe to calculate flight parameters like airspeed and
altitude.
2. In the event of a total AHRS failure, which of the following information will be lost on the
PFD?
A. Airspeed and Altimeter tapes
,B. Vertical Speed and OAT
C. Attitude Indicator and Heading Bug
D. Engine Manifold Pressure and RPM
Answer: C
Conceptual Explanation: The AHRS provides attitude, rate of turn, and slip/skid
information. Losing it results in the loss of the horizon (Attitude) and directional
information.
3. What does a magenta line extending from the current airspeed on the airspeed tape
represent?
A. The target airspeed set in the flight director
B. Airspeed trend vector showing predicted airspeed in 6 seconds
C. The maximum structural cruising speed (Vno)
D. Minimum controllable airspeed (Vmc)
Answer: B
Conceptual Explanation: The airspeed trend vector indicates what the airspeed will be in
6 seconds if the current rate of acceleration or deceleration is maintained.
4. Which sensor technology is commonly used within an AHRS to determine rotation rates
without a mechanical gyroscope?
A. MEMS (Micro-Electro-Mechanical Systems) accelerometers and tilt sensors
, B. Aneroid wafers
C. Vortex generators
D. Magnetic float sensors
Answer: A
Conceptual Explanation: Modern AHRS units use MEMS technology, including solid-state
accelerometers and rate sensors, to calculate aircraft attitude.
5. If the PFD screen fails completely, what mechanism allows the flight data to be displayed
on the MFD?
A. Manual cross-fill
B. Automatic Synchronization Mode
C. Standby Instrument Override
D. Reversionary Mode
Answer: D
Conceptual Explanation: Reversionary mode (or composite mode) displays a combined
PFD/MFD format on the remaining functional screen in the event of a display failure.
6. How is the slip/skid indicator represented on a standard Glass Cockpit PFD?
A. A physical ball in a liquid-filled tube
B. A circular icon on the wind vector
