WorksheetsAir Tech - Pressure Instruments
Total questions: 38
Worksheet time: 20mins
Which instrument(s) take in static pressure?
ASI, VSI
ASI, VSI, ALI
ALT, VSI
ALT, VSI, ASI
Which instrument(s) take in total pressure?
ASI
ALT, VSI
VSI
ALT, VSI, ASI
What is static pressure?
ambient pressure
pressure due to movement
dynamic pressure - total pressure
dynamic pressure + total pressure
What is dynamic pressure?
ambient pressure
pressure due to movement
dynamic pressure - total pressure
dynamic pressure + total pressure
What is pitot pressure?
ambient pressure
pressure due to movement
dynamic pressure - static pressure
dynamic pressure + static pressure
What is the purpose of pitot heat?
To reduce the density of the incoming air
To warm the static vent in icing conditions
To avoid icing on the pitot tube in icing conditions
To heat up the incoming air, as cool air could damage the instrument
What is an alternate pressure source?
A back up dynamic vent below the fuselage of the aircraft
A standby capsule in case the instrument aneroid capsule breaks
A back up pitot source in case of blockage or icing
A back up static source in case of blockage or icing
What is the basic principle of the ASI?
Pitot pressure enters a capsule and static pressure surrounds it in the instrument casing
Static pressure enters a capsule and slowly leaks into the instrument casing
Static pressure enters a capsule and pitot pressure surrounds it in the instrument casing
Static pressure enters the instrument casing and a capsule expands or contracts as the pressure changes
What is the basic principle of the VSI?
Pitot pressure enters a capsule and static pressure surrounds it in the instrument casing
Static pressure enters a capsule and slowly leaks into the instrument casing
Static pressure enters a capsule and pitot pressure surrounds it in the instrument casing
Static pressure enters the instrument casing and a capsule expands or contracts as the pressure changes
What is the basic principle of the Altimeter?
Pitot pressure enters a capsule and static pressure surrounds it in the instrument casing
Static pressure enters a capsule and slowly leaks into the instrument casing
Static pressure enters a capsule and pitot pressure surrounds it in the instrument casing
Static pressure enters the instrument casing and a capsule expands or contracts as the pressure changes
What does Vso mean?
Max speed in landing configuration
Stall speed in landing configuration
Stall speed in clean configuration
Max flap extension speed
What does Vs1 mean?
Max speed in landing configuration
Stall speed in landing configuration
Stall speed in clean configuration
Max flap extension speed
What does Vfe mean?
Max speed in landing configuration
Stall speed in landing configuration
Stall speed in clean configuration
Max flap extension speed
What does Vno mean?
Max speed in landing configuration
Max normal operating speed
Never exceed speed
Max flap extension speed
What does Vne mean?
Max speed in landing configuration
Max normal operating speed
Never exceed speed
Max flap extension speed
What is the upper limit on the green range of the ASI?
Vfe
Vso
Vne
Vno
What is the lower limit on the yellow range of the ASI?
Vfe
Vso
Vne
Vno
What is the lower limit on the white range of the ASI?
Vfe
Vso
Vne
Vno
What is the lower limit on the green range of the ASI?
Vfe
Vso
Vs1
Va
What is the upper limit on the white range of the ASI?
Vfe
Vso
Vs1
Vno
What is the upper limit on the yellow range of the ASI?
Vfe
Vso
Vne
Vno
What is the difference between IAS and TAS?
Select all that apply
pressure error
instrument error
compressibility error
deviation error
density error
What is the difference between TAS and GS?
Select all that apply
pressure error
wind
compressibility error
deviation error
density error
How is position error in the ASI corrected for?
Having 2 pitot tubes
Not trusting the ASI indications during a turn
Using a static source on each side of the aircraft
Calibration in the gearing of the mechanics in the instrument
What does QNH mean or read?
sea level temperature
altitude
pressure from a datum
pressure altitude
What does QFE mean or read?
sea level temperature
altitude
pressure from a datum
pressure altitude
What does QNE mean or read?
sea level temperature
altitude
pressure from a datum
pressure altitude
To find QFE at your aerodrome what should you do?
Set the altimeter to sea level pressure
Set 1013 in the sub scale window
Turn the knob until you see 0ft on the altimeter
Set zero in the sub scale window
Flying from 13 degrees to 29 degrees will cause _____
The aircraft's true altitude to be lower than indicated
The aircraft's true altitude to be higher than indicated
A danger with terrain clearance
Nothing- only pressure causes an error in the altimeter
Flying from 1013hPa to 1031hPa will cause _____
The aircraft's true altitude to be lower than indicated
The aircraft's true altitude to be higher than indicated
A danger with terrain clearance
Nothing- only pressure causes an error in the altimeter
What are errors that affects the VSI?
position and density
lag and compression
density and compression
lag and position
What are some serviceability checks for the pitot-static system?
Select all that apply
Checking covers are removed
Checking ASI on take off roll
Check altimeter on take off roll
Checking altimeter reads zero on the ground
If there is a static vent blockage, what will happen to the VSI reading in a climb?
needle will indicate a descent
needle will begin to indicate climb and stay on this indication
needle will show zero
needle will show norma climb as VSI uses pitot not static
If there is a static vent blockage, what will happen to the altimeter reading in a climb?
instrument will under read altitude
instrument will over read altitude
instrument will read zero feet
instrument will not be affected as ALT uses pitot
If there is a static vent blockage, what will happen to the ASI reading in a climb?
instrument will under read speed
instrument will over read speed
instrument will read zero knots
instrument will not be affected as ASI uses pitot only
If there is a pitot tube blockage, what will happen to the ASI reading in a climb?
instrument will under read speed
instrument will over read speed
instrument will read zero knots
instrument will not be affected as ASI uses pitot only
If there is a pitot tube blockage, what will happen to the ALT reading in a climb?
instrument will under read altitude
instrument will over read altitude
instrument will read zero feet
instrument will not be affected as ALT uses static only
What is the purpose of the drain hole in a pitot tube?
to allow the static pressure to equalise before entering the casing
to allow bugs to escape and not enter instrument casing
to drain melted ice after using pitot heat
to drain static pressure from the pitot pressure so only dynamic pressure is read
