Concerning the pitot static system, the static pressure error?

. Is caused by disturbed airflow around the static ports.

. Is a direct effect of blockage of the static ports.

. is a direct effect of heating of the static ports.

Affects the alternate static source only.

The pressure measured at the forward facing orifice of a pitot tube is the :

total pressure plus static pressure.

The alternate static source of a light non-pressurised aircraft is located in the flight deck. When it is used, the static pressure sensed is likely to be?

Lower than ambient pressure due to aerodynamic suction

Lower than ambient pressure if QNH is greater than 1013 hPa

Higher than ambient pressure due to aerodynamic suction

Higher than ambient pressure if QNH is greater than 1013 hPa

A pitot tube covered by ice which blocks the ram air inlet will affect the following instrument (s) :

airspeed indicator, altimeter and vertical speed indicator

The pressure altitude is the altitude corresponding?

In standard atmosphere, to the pressure Ps prevailing at this point.

In standard atmosphere, to the reference pressure Ps.

In ambient atmosphere, to the pressure Ps prevailing at this point.

In ambient atmosphere, to the reference pressure Ps.

In a non-pressurized aircraft, if one or several static pressure ports are damaged, there is an ultimate emergency means for restoring a practically correct static pressure intake :

breaking the rate-of-climb indicator glass window

calculating the ambient static pressure, allowing for the altitude and QNH and adjusting the instruments

descending as much as possible in order to fly at a pressure as close to 1013.25 hPa as possible

slightly opening a window to restore the ambient pressure in the cabin

The ADC uses the following parameters as input data:

Static pressure, total pressure, TAT.

Mach number, barometric altitude, CAS.

Total pressure, static pressure, TAT, EGT.

The total pressure head comprises a mast which moves its port to a distance from the aircraft skin in order?

To locate it outside the boundary layer

To not disturb the aerodynamic flow around the aircraft

To make it easily accessible during maintenance

The response time of a vertical speed detector may be increased by adding a?

Correction based on an accelerometer sensor.

DGCA Air Navigation: Pitot-Static System Questions

76 exam-style Pitot-Static System questions for the DGCA Air Navigation paper (CPL · ATPL · PPL). The first 12 are free below with answers and explanations — sign up free to practise all of them with progress tracking.

Q1
Concerning the pitot static system, the static pressure error?
- A . Is a direct effect of blockage of the static ports.
- B . is a direct effect of heating of the static ports.
- C Affects the alternate static source only.
- D . Is caused by disturbed airflow around the static ports.
Show answer

Correct answer: D. . Is caused by disturbed airflow around the static ports.

Static (position) pressure error is caused by disturbed airflow around the static ports.
Q2
The pressure measured at the forward facing orifice of a pitot tube is the :
- A total pressure plus static pressure.
- B static pressure
- C total pressure
- D dynamic pressure
Show answer

Correct answer: C. total pressure

This Explanation is Coming Soon
Q3
The alternate static source of a light non-pressurised aeroplane is located in the flight deck. When used the altimeter?
- A Tends to over read
- B Tens to under read
- C is blocked
- D Indicates zero
Show answer

Correct answer: A. Tends to over read

Cabin static is lower than ambient, so on the alternate static source the altimeter tends to over-read.
Q4
The alternate static source of a light non-pressurised aircraft is located in the flight deck. When it is used, the static pressure sensed is likely to be?
- A Lower than ambient pressure if QNH is greater than 1013 hPa
- B Lower than ambient pressure due to aerodynamic suction
- C Higher than ambient pressure due to aerodynamic suction
- D Higher than ambient pressure if QNH is greater than 1013 hPa
Show answer

Correct answer: B. Lower than ambient pressure due to aerodynamic suction

Flight-deck cabin pressure is lower than ambient because of aerodynamic suction over the fuselage.
Q5
A pitot tube covered by ice which blocks the ram air inlet will affect the following instrument (s) :
- A airspeed indicator, altimeter and vertical speed indicator
- B vertical speed indicator only.
- C altimeter only
- D airspeed indicator only
Show answer

Correct answer: D. airspeed indicator only

This Explanation is Coming Soon
Q6
The pressure altitude is the altitude corresponding?
- A In standard atmosphere, to the reference pressure Ps.
- B In ambient atmosphere, to the pressure Ps prevailing at this point.
- C In standard atmosphere, to the pressure Ps prevailing at this point.
- D In ambient atmosphere, to the reference pressure Ps.
Show answer

Correct answer: C. In standard atmosphere, to the pressure Ps prevailing at this point.

Pressure altitude is the altitude in the standard atmosphere at which the prevailing pressure occurs.
Q7
In a non-pressurized aircraft, if one or several static pressure ports are damaged, there is an ultimate emergency means for restoring a practically correct static pressure intake :
- A breaking the rate-of-climb indicator glass window
- B calculating the ambient static pressure, allowing for the altitude and QNH and adjusting the instruments
- C descending as much as possible in order to fly at a pressure as close to 1013.25 hPa as possible
- D slightly opening a window to restore the ambient pressure in the cabin
Show answer

Correct answer: A. breaking the rate-of-climb indicator glass window

This Explanation is Coming Soon
Q8
The ADC uses the following parameters as input data:
- A Mach number, barometric altitude, CAS.
- B TAS, barometric altitude, TAT.
- C Static pressure, total pressure, TAT.
- D Total pressure, static pressure, TAT, EGT.
Show answer

Correct answer: C. Static pressure, total pressure, TAT.

The ADC's raw inputs are static pressure, total pressure and total air temperature.
Q9
Pitot blocked in climb, altimeter will?
- A Constant
- B Over
- C Under
Show answer

Correct answer: A. Constant

Altimeter uses static pressure, not pitot. A blocked pitot doesn’t affect it, so it stays constant and accurate.
Q10
The total pressure head comprises a mast which moves its port to a distance from the aircraft skin in order?
- A To not disturb the aerodynamic flow around the aircraft
- B To locate it outside the boundary layer
- C To protect it from icing
- D To make it easily accessible during maintenance
Show answer

Correct answer: B. To locate it outside the boundary layer

The pitot mast holds its port clear of the boundary layer to sense undisturbed total pressure.
Q11
Pitot partially blocked in climb, ASI will:
- A Act like altimeter
- B Decrease gradually
- C Increase
Show answer

Correct answer: A. Act like altimeter

A partially blocked pitot traps pressure, so as static pressure drops in climb, ASI reads like an altimeter, showing a false increase.
Q12
The response time of a vertical speed detector may be increased by adding a?
- A Correction based on an accelerometer sensor.
- B Bi-metallic strip.
- C Return spring.
- D Second calibrated port.
Show answer

Correct answer: A. Correction based on an accelerometer sensor.

Adding an accelerometer sensor creates the instantaneous VSI and improves its response time.

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