Aviation Systems & SE (2018) Flashcards
The A-scope’s positive gate pulse goes to the control grid of the CRT, causing the electron beam to________
display the output of the video mixer.
What type of display works best under conditions where the antenna scans a sector of less than 180 degrees?
B-scan.
The PPI scope provides what type of presentation?
a radial sweep line, manlike picture
List the factors that affect the maximum range of pulse radars.
transmitted power
PRF
receiver sensitivity
What are the characteristics of radar?
rage
azimuth
resolution
accuracy
Define azimuth resolution.
the ability to separate targets at the same range but on different bearings
Why does a long pulse width increase or decrease the range capabilities of a radar?
because of the greater amount of RF energy sent out in each pulse.
List the units in an IFF that make up the challenging station.
interrogator
synchronizer
radar
A point that is defined by stated or implied coordinates is known as a
position
The intended horizontal direction of travel is known as
course
In what two reference directions can you express bearings?
True north or the direction the aircraft is pointing.
The east/west geographical coordinate is known as
longitude
You measure longitude 180° east or west from what point?
Prime Meridian, 0 degree in Greenwich, England.
The angle between true north and the direction of the earth’s magnetic field is known as
variation
How do you label variation?
east or west as the magnetic field direction is east or west, respectively, of true north.
Magnetic influences cause what type of error in magnetic compasses?
deviation
The net result of both variation and deviation is known as
compass error
You can determine a position from the record of a previously known position, course, speed, and time traveled by what process?
dead reckoning
What navigation system makes use of the physical laws of motion that Newton
inertial navigation
Describe navigation.
Air navigation is the process of determining the geographical position and maintaining the desired direction of an aircraft relative to the earth’s surface.
Describe differentiation
Differentiation is the process of investigating or comparing ho w one physical property varies with respect to another.
Define a self-contained navigation system
A self-contained system is complete in itself; it does not depend on the transmission of data from ground installations.
State the transmission principle of the VOR
The VOR transmission principle is based on creating a phase difference between two signals.
What is the frequency range of the transmitted airborne TACAN DME
1025 MHz to 1150 MHz
With the addition of X and Y modes to the TACAN system, what total number of
channels are available?
126 channels in X and 126 channels in Y, 252 total channels available.
Loran determines the difference by measuring time intervals between the arrival of the first signal and the arrival of a second signal. What type of measurements can be used?
CRT display, automatically by the loran set, integrating with the computer.
State the basic reason for incorporating the navigational computer in aircraft.
To handle the many flight conditions at the speed of sound or above.
List the data-gathering units of a typical navigational computer system.
Radar Doppler INS loran TACAN.
What other uses can the sophisticated computer system provide?
Solving of ballistic problems, automatic release of bombs and missiles, cargo drops, and notification of bailout times are just a few.
What two transmission bands are contained within the line-of-sight transmission band?
UHF and VHF.
What is meant by the statement “some VHF transceivers are dual purpose?”
Their receivers also work with VHF and VOR.
What type of communications antenna is excellent for higher frequencies?
The biconical or disc horn
What term is given to electronic ECM equipment designed to jam communica- tions, navigation, and radar receivers?
Active ECM.
Describe ballistics.
The science of motion of projectiles.
Define trajectory.
The curve of a projectile describes in space as it travels to the target.
What two factors determine the maximum detection range of a submarine?
Its magnetic anomaly and the sensitivity of the detector.
What is the purpose of compensation
To provide a magnetically clean environment and ensure the detecting system will not be limited by the aircraft itself.
What recorder system plots the frequency of the sound waves against the intensity of their acoustic energy and duration of the sound emission from an omnidirectional passive sonobuoy?
LOFAR
DIFAR
List the types of sonobuoys.
Passive active CASS DICASS special purpose
List the four basic modes of the DIFAR system.
Omnisearch
ALI-LOFAR
DIFAR
range
What is the purpose of external power?
Starting aircraft engines and/or ground servicing and maintenance.
List some power conversion devices
Transformer-rectifier, inverter, and frequency changer.
What components protect an aircraft electrical system?
Fuses
current limiters
circuit breakers.
At what potential should a fuse be operated? For what reason?
At about 75 percent of its rated value, it provides a good balance between protection and reliability.
What advantage does a circuit breaker have have over a fuse?
They can be reset and used again.
List the three basic types of circuit breakers.
Thermal
magnetic
thermomagnetic.
MEPP refers to what types of units? How are these units powered?
Portable units not installed aboard aircraft; they are powered by either diesel fuel, jet fuel, gasoline, or electricity.
What MEPPs identification would indicate dc output power, as output power, and ac/dc output power, respectively?
NA, NB, and NC
What is the difference between an MEPP and an MMG?
MMGs are not self-contained and require an external electrical power source for operation.
