ASI

In case of static port blockage, the airspeed indicator:

• AOver reads in a climb and under reads in a descent.
• BUnder reads in a descent only.
• CUnder reads in a climb and over reads in a descent.
• DOver reads in a climb only.

The alternate static source of a light non-pressurised aeroplane is located in the flight deck. When used:

• AThe airspeed indicator tends to under read.
• BThe airspeed indicator tends to over read.
• CIt has no influence on airspeed indicator reading.
• DThe airspeed indicator indicates a consistent decreasing speed.

Given: Pt = total pressure: Ps = static pressure: Pd = dynamic pressure: The airspeed indicator measures:

• APs - pt.
• BPt-pd.
• CPd - ps.
• DPt-ps.