flight instriments Flashcards
Magnetic Variation
is the angular difference between true geographic north and south and the magnetic north pole and magnetic south pole, causing a deviation between a magnetic compass reading and true north.
Magnetic Deviation
Your aircraft’s instruments introduce a form of disturbance that impacts your compass, and this disruption is referred to as deviation. Within the compass itself, there are compensatory magnets strategically positioned to counterbalance these interfering magnetic fields.
MAGNETIC DIP: TURNING ERRORS
Remember UNOS (northern hemisphere):
Undershoot North
Overshoot South
MAGNETIC DIP: ACCELERATION/DECELERATION ERRORS
ANDS(Northern Hemisphere):
Accelerate North
Decelerate South
Oscillation Error
An oscillation error involves all of the previously mentioned errors, resulting in a compass swing with the compass card swinging back and forth around the heading direction of the aircraft.
What should be the indication on the magnetic compass as you roll into a standard rate turn to the right from a south heading in the Northern Hemisphere?
The compass will indicate a turn to the right, but at a faster rate than is actually occurring.
What is pressure altitude?
B. The altitude indicated when the barometric pressure scale is set to 29.92
Pressure altitude can be found by setting the standard barometric pressure of 29.92 on the pressure scale of the altimeter and then reading the altitude shown by the hands of the altimeter.
Glass cockpit aircraft refer to
aircraft with both digital and limited number of analog instruments.
- In the Northern Hemisphere, a magnetic compass will normally indicate initially a turn toward the west if
B. a right turn is entered from a north heading.
- Under what condition will true altitude be lower than indicated altitude?
A. In colder than standard air temperature.
true altitude
the vertical distance of an aircraft above mean sea level (MSL)
absolute altitude
the vertical distance of an aircraft above the ground or terrain it’s flying over
Calibrated altitude
the indicated altitude of an aircraft corrected for errors such as instrument error, static pressure error, and installation error. It’s also corrected for nonstandard atmospheric conditions, and is considered the actual height above mean sea level, as if measured with a tape measure.
indicated altitude
the altitude shown on an aircraft’s altimeter when it is set to the local barometric pressure at the airport.
compass error
as you accelerate, your compass will show a turn to the North. And as you decelerate, your compass will show a turn to the South.
