VERTICAL SPEED INDICATOR

#9. Change of temperature as an aircraft climbs or descends:

• Awill affect VSI readings whenever temperature lapse rate differs from standard conditions.
• Bis compensated at the metering unit by means of a capillary and orifice
• Chas no effect on the VSI as only static pressure is used in this instrument.
• Dmay be allowed for by use of tables or computer.

#1. During a missed approach and go-around procedure the change of aircraft attitude plus raising of the landing gear and changing of flap settings can cause short term unpredictable errors in certain instruments. The instruments most likely to be affected in this case are:

• Athe altimeter, artificial horizon and vertical speed indicator.
• Bthe airspeed indicator, machmeter and vertical speed indicator.
• Cthe machmeter, airspeed indicator, altimeter and vertical speed indicator
• Dthe vertical speed indicator, airspeed indicator and altimeter.

#2. The vertical speed indicator indications may be in error for some seconds after starting or finishing a climb or descent. The error is a result of:

• Aa combination of time lag and manoeuvre induced errors.
• Ba combination of position error and manoeuvre induced errors.
• Cmanoeuvre induced errors only.
• Da combination of time lag and instrument error.