Chapter 3: Flight Instruments Flashcards
Which instrument will become inoperative if the pitot tube becomes clogged?
Airspeed.
Which instrument(s) will become inoperative if the static vents become clogged?
Airspeed, altimeter, and vertical speed.
If an altimeter setting is not available before flight, to which altitude should the pilot adjust the altimeter?
The elevation of the departure area.
Prior to takeoff, the altimeter should be set to which altitude or altimeter setting?
The current local altimeter setting, if available, or the departure airport.
At what altitude shall the altimeter be set to 29.92, when climbing to cruising level?
18,000 feet MSL.
Altimeter setting is the value to which the barometric pressure scale of the altimeter is set so the altimeter indicates
true altitude at field elevation.
How do variations in temperature affect the altimeter?
Pressure levels are raised on warm days and the indicated altitude is lower than true altitude.
What is true altitude?
The vertical distance of the aircraft above sea level.
Under what condition will true altitude be lower than indicated altitude?
In colder than standard air temperature.
What is absolute altitude?
The vertical distance of the aircraft above the surface.
What is density altitude?
The pressure altitude corrected for nonstandard temperature.
What is pressure altitude?
The altitude indicated when the barometric pressure scale is set to 29.92.
Under what condition is indicated altitude the same as true altitude?
When at sea level under standard conditions.
If it is necessary to set the altimeter from 29.15 to 29.85, which change occurs?
700 foot increase in indicated altitude.
Under which condition will pressure altitude be equal to true altitude?
When standard atmospheric conditions exist.
Under what condition is pressure altitude and density altitude the same value?
At standard temperature.
If a flight is made from an area of low pressure into an area of high pressure without the altimeter setting being adjusted, the altimeter will indicate
lower then the actual altitude above sea level.
If a flight is made from an area of high pressure into an area of lower pressure without the altimeter setting being adjusted, the altimeter will indicate
higher than the actual altitude above sea level.
Which condition would cause the altimeter to indicate a lower altitude than true altitude?
Air temperature warmer than standard.
If a pilot changes the altimeter setting from 30.11 to 29.96, what is the approimate change in indication?
Altimeter will indicate 150 feet lower.
Deviation error of the magnetic compass is caused by
certain metals and electrical systems within the aircraft.
In the Northern Hemisphere, a magnetic compass will normally indicate a turn toward the north if
an aircraft is accelerated while on an east or west heading.
In the Northern Hemisphere, the magnetic compass will normally indicate a turn toward the south when
the aircraft is decelerated while on a west heading.
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.
In the Northern Hemisphere, if an aircraft is accelerated or decelerated, the magnetic compass will normally indicate
correctly when on a north or south heading.
In the Northern Hemisphere, a magnetic compass will normally indicate initially a turn toward the west if
a right turn is entered from a north heading.
In the Northern Hemisphere, a magnetic compass will normally indicate initially a turn toward the east if
a left turn is entered from a north heading.
During flight, when are the indications of a magnetic compass accurate?
Only in straight-and-level unaccelerated flight.
