30 Questions
What is the purpose of the partially transparent mirror in the laser gyro?
To allow some laser light to reach the two photocell detectors
What is the primary function of the battery unit in an aircraft?
To provide an uninterruptible power supply during power supply switching or total power failure
How many ring laser gyros are used in the IRS operation?
Three
What is the rotation rate of the Earth that the laser gyros accurately sense?
15 degrees per hour
How is the battery unit maintained during normal operation?
Through a trickle charge supply from the INU
What is the main difference between an Inertial Navigation System (INS) and an Inertial Reference System (IRS)?
INS uses gyro-stabilised platforms, while IRS uses software-generated stabilised platforms
What is the function of the servo motor in the laser gyro?
To adjust the path length of the laser beam
What is the output of the IRS and INU system that can replace conventional equipment?
Instantaneous vertical speed and altitude
What is the term used to describe the IRS due to the way the accelerometers and ring laser gyros are mounted?
Strapdown system
What innovation has led to the development of the Inertial Reference System (IRS)?
Improvements in laser detecting and computation power
How are the three ring laser gyros and three accelerometers aligned in the IRS operation?
Perpendicular to each other
What is a characteristic of the battery unit in different aircraft installations?
The battery unit size and capacity vary between installations
What is the primary function of the gyrostabilised platform in an Inertial Navigation System?
To maintain accelerometers aligned with the aircraft axes
What is the purpose of the rate gyroscopes in an Inertial Navigation System?
To sense displacement of the platform from the reference position
What component of an Inertial Navigation System is responsible for controlling the display of navigation data?
Control Display Unit (CDU)
How do the accelerometers in an Inertial Navigation System measure aircraft velocity?
By integrating the acceleration measurements
What is the purpose of the torque motor in an Inertial Navigation System?
To drive the platform back to the reference position
What is the minimum reference required to calculate aircraft position using an Inertial Navigation System?
Starting reference (latitude/longitude)
What factor affects the range of an NDB over different types of land?
Type of terrain
What can cause a rapid change in bearing indications in mountainous areas?
Mountain effect
What is the primary method of overcoming station interference?
Designing the receiver with a high adjacent channel rejection ratio
What type of interference can cause the radio compass to indicate the direction of a thunderstorm?
Static interference
What is the term for the phenomenon where the energy received from an NDB consists of two or more waves?
Mountain effect
What is the range of an NDB over the sea compared to its range over unfavourable types of land?
Greater over sea
What is the primary function of the Enhanced Ground Proximity Warning System (EGPWS)?
To monitor the aircraft's position relative to the surrounding terrain
What is the main difference between the traditional Ground Proximity Warning System and the Enhanced Ground Proximity Warning System (EGPWS)?
The EGPWS uses GPS inputs, whereas the traditional system does not
What is the purpose of the VOR/DME navigation system?
To provide accurate positional awareness for aircraft
What is the primary function of the computer in the Ground Proximity Warning System?
To calculate the likelihood of danger based on aircraft system inputs
What is the main feature of the Area Navigation system?
It uses VOR/DME navigation and other ground-based stations
What is the primary benefit of the Enhanced Ground Proximity Warning System (EGPWS) over traditional systems?
It provides much greater warning times of impending ground contact
This quiz covers the measurement of aircraft acceleration about its three axes and how to calculate velocity and position using these measurements. It also touches on the importance of accurate alignment of accelerometers. Test your knowledge of aircraft aerodynamics and systems.
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