Pitot Static Flashcards
If a pilot changes the altimeter setting from 30.11 to 29.96, what is the approximate change in indication?
The altimeter will indicate 150 feet lower
The difference between 30.11 and 29.96 is .15”Hg. The standard lapse rate is 1” Hg per 1,000’ in altitude. Therefore, .15 x1,000’ = 150’ and the indication would be lower.
Under what condition is pressure altitude and density altitude the same value?
At standard temperature.
Pressure altitude and density are the same value in standard conditions.
How do variations in temperature affect the altimeter?
Pressure levels are raised on warm days and the indicated altitude is lower than true altitude.
On a warm day, the atmosphere expands. An aircraft will actually be higher than the altimeter is indicating (higher pressure level). On a cold day the atmosphere contracts and an aircraft will be lower than the altimeter is indicating.
What represents the maximum structural cruising speed?
The upper limit of the green arc
Which instrument will become inoperative if the pitot tube becomes clogged?
Airspeed
The pitot tube provides ram air to operate the airspeed indicator. It does not affect the other two pitot-static instruments.
What is pressure altitude?
The altitude indicated when the barometric pressure scale is set to 29.92.
Pressure altitude is indicated when the altimeter setting window (barometric scale) is adjusted to 29.92”Hg.
If it is necessary to set the altimeter from 29.15 to 29.85, what change occurs?
a 700 foot increase in indicated altitude
What represents the full flap operating range for an aircraft?
The white arc on the airspeed indicator represents the flap operating range for an aircraft.
What factor would tend to increase the density altitude at a given airport?
An increase in ambient temperature
The primary factor that would tend to increase density altitude at a given airport is an increase in ambient temperature. The hotter the air temperature, the less dense the air. This is equivalent to increasing density altitude.
What represents the caution range of an airplane?
The yellow arc on the airspeed indicator
If the pitot tube and outside static vents become clogged, which instruments would be affected?
The altimeter, airspeed indicator, and vertical speed indicator.
What is the maximum speed at which an airplane can be operated in smooth air?
The never exceed speed is indicated on the airspeed indicator with a red line
What is absolute altitude?
The vertical distance of the aircraft above the surface.
What color identifies the never-exceed speed?
The red radial line.
The pitot system provides impact pressure for which instrument?
Airspeed indicator.
The pitot tube provides ram air to operate the airspeed indicator. It does not affect the other two pitot-static instruments.
Which condition would cause the altimeter to indicate a lower altitude than true altitude?
air temperature warmer than standard.
When air is warmer than average, the aircraft is higher than the altimeter indicates. Therefore, the altimeter will read lower than the aircraft’s actual altitude.
Which instrument(s) will become inoperative if the static vents become clogged?
All three pitot-static instruments are affected by a clogged static vent - airspeed indicator, altimeter, and vertical speed.
Under what condition will true altitude be lower than indicated altitude?
IN colder than standard air temperature
Under which conditions will pressure altitude be equal to true altitude?
When standard atmospheric conditions exist.
True altitude is the actual altitude above MSL. Pressure altitude is the altitude in the standard atmosphere where pressure is the same as where you are. Pressure altitude is = to true altitude in standard temperature
Which color identifies the power-off stalling speed with wing flaps and landing gear in the landing configuration?
The lower limit of the white arc.
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 actual altitude above sea level
Which color identifies the power-off stalling speed in a specified configuration?
The lower limit of the green arc.
What is the maximum flaps extended speed?
Upper limit of the white arc
Under what condition is indicated altitude the same as true altitude?
When at sea level under standard conditions
If the OAT at a given altitude is warmer than standard, the density altitude is…?
higher than pressure altitude
As altitude increases the indicated airspeed at which a given airplane stalls in a particular configuration will…?
remain the same regardless of altitude.
Indicated airspeed is dependent on the amount of ram air pressure entering the pitot tube. Regardless of an aircraft’s altitude, the indicated airspeed for a particular maneuver remains the same
What is true altitude?
The vertical distance of the aircraft above sea level
What is density altitude?
The pressure altitude corrected for nonstandard temperature.
Altimeter setting is the value to which the barometric pressure scale of the altimeter is set sot he altimeter indicates?
true altitude at field elevation
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 than the actual altitude above sea level.
When flying from an area of low pressure to an area of high pressure, the aircraft will be higher than the indication on the altimeter. Therefore, the altimeter will read lower than the aircraft’s actual altitude.
What is an important airspeed limitation that is not color coded on airspeed indicators?
Maneuvering speed. Sometimes called, “rough air speed.”
