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Which cockpit instruments are connected to the static port?

  • A

    Altimeter, vertical speed indicator, airspeed indicator.

  • B

    Airspeed indicator, direct-reading compass, slip indicator.

  • C

    Altimeter, slip indicator, navigational computer.

  • D

    Airspeed indicator, altimeter, direct-reading compass.

Air Speed Indicator (ASI) is the only instrument that uses both Static and Dynamic pressure. It shows Indicated or Calibrated speed, and with a mechanism that compensates for altitude and temperature corrections, it can also show True Air Speed. It has Arcs and Markings for a big variety of speeds like, Vs, Vso, V flaps extend, Vno, Vne.

The ASI uses a dynamic capsule that receives TOTAL pressure from the Pitot tube. If we don’t remove the Static pressure from inside the capsule, then we are going to have a false indication of greater speed. The only way to eliminate the Static pressure from inside the capsule, is to feed the case of the instrument with Static pressure. That can be easily done, if we connect the case with the static source.

Since the Static pressure from the case is the same with the Static pressure inside the capsule, one eliminates the other and we finally have Dynamic pressure inside the capsule, that is translated to SPEED.

Altimeter is an instrument used to measure the altitude of an aeroplane above a fixed level. Altitude can be determined based on the measurement of atmospheric pressure (Static pressure). The greater the altitude, the lower the pressure. When a barometer is supplied with a nonlinear calibration so as to indicate altitude, the instrument is a type of altimeter called a pressure altimeter or barometric altimeter. It is connected directly with the Static port.

Vertical Speed Indicator (VSI) also known as a Rate of Climb and Descent Indicator (RCDI) is an instrument which indicates the Rate of Climb or Descent of an aircraft. The VSI uses the aircraft Pitot-Static System (Static port) to determine the vertical speed and depicts the result on a conventional needle and circular scale instrument, or on a ribbon at the side of an Electronic Flight Instrument System EADI.

Artificial Horizon, formerly known as the Gyro Horizon or Artificial Horizon, is a flight instrument that informs the pilot of the aircraft orientation relative to Earth's horizon, and gives an immediate indication of the smallest orientation change. The miniature aircraft and horizon bar mimic the relationship of the aircraft relative to the actual horizon. It is a primary instrument for flight in instrument meteorological conditions.

The heart of the AI is a gyroscope (gyro) that spins at high speed, from either an electric motor, or through the action of a stream of air pushing on rotor vanes placed along its periphery. The stream of air is provided by a vacuum system, driven by a vacuum pump, or a venturi.

In navigation, an instrument for determining direction on the surface of Earth by means of a magnetic pointer that aligns itself with Earth’s magnetic field. The Magnetic Compass is the oldest and most familiar type of compass and is used in different forms in aircraft, ships, and land vehicles.

The cockpit instruments connected to the Pitot tube are Altimeter, Vertical Speed Indicator, Airspeed Indicator.

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