AIR SPEED INDICATOR

#1. If the pitot line to an ASI becomes totally blocked during a climb, the ASI reading will:

• Adecrease, no matter what the actual airspeed is.
• Bincrease, no matter what the actual airspeed is.
• Cprogressively under indicate the value of the airspeed
• Dstick at the airspeed showing at the moment of blockage.

#2. Compressibility error:

• Acauses overreading of the ASI at all levels whenever TAS exceeds 300 kt.
• Bcauses overreading of the ASI whenever CAS exceeds 300 kt.
• Cis calibrated out of the ASI at MSL ISA conditions and only causes overreading when air density is decreased and CAS exceeds 300 kt.
• Dis calibrated out of the ASI at MSL ISA conditions and only causes overreading when air density is decreased and TAS exceeds 300 kt.

#3. If the static line to the ASI becomes blocked during a long descent, a dangerous situation could arise due to the ASI:

• Aoverreading, this indicated speed falsely showing the aircraft to be further from the stalling speed than it actually is.
• Bunderreading, this indicated speed falsely showing the aircraft to be closer to the stalling speed than it actually is.
• Cunderreading, this indicated speed possibly leading to the operation of flaps and/or landing gear at speeds in excess of safety speeds.
• Doverreading, this indicated speed possibly leading to the operation of flaps and/or landing gear at speeds in excess of safety speeds.