Vayudoot Aviation

1. 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:

a combination of position error and manoeuvre induced errors.

a combination of time lag and instrument error.

a combination of time lag and manoeuvre induced errors.

manoeuvre induced errors only.

2. 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

the vertical speed indicator, airspeed indicator and altimeter.

the airspeed indicator, machmeter and vertical speed indicator.

the altimeter, artificial horizon and vertical speed indicator.

the machmeter, airspeed indicator, altimeter and vertical speed indicator

3. Change of temperature as an aircraft climbs or descends

has no effect on the VSI as only static pressure is used in this instrument.

may be allowed for by use of tables or computer.

will affect VSI readings whenever temperature lapse rate differs from standard conditions.

is compensated at the metering unit by means of a capillary and orifice

4. In the IVSI, lag error:

is overcome by feeding a sample of static pressure to the case and delaying it to the capsule.

is virtually overcome by using a special dashpot accelerometer assembly.

is overcome by the use of logarithmic presentation.

is only overcome when initiating a climb or descent.

5. In conditions of clear air turbulence

both types will react the same.

the IVSI is more sensitive.

the vertical acceleration pump will not be affected.

the standard VSI is more sensitive.

6. When entering a steep turn, an IVSI is likely to show

no change in altitude.

a slight climb.

a slight descent at high airspeed only.

a slight descent.

7. If the static vent becomes blocked during a climb

the VSI will return to zero.

the VSI will stop at the rate of climb of the aircraft at the time of blockage.

the VSI will indicate an increasing rate of climb

the VSI will indicate a decreasing rate of climb.

8. The advantage of having the VSI dial presentation in logarithmic spacing rather than in linear spacing is that

the internal mechanism is simplified by deletion of the calibration choke.

readings are instantaneous.

a greater range of rates of climb and descent is shown.

at low rates of climb or descent the pointer movement is much larger and so is more easily read.

9. Permissible limits of accuracy of the VSI are ....... when ....... within a temperature range of ....... and ....... outside this range

+ 250 fpm, on the ground, -20°C to +50°C, + 300 fpm

+ 200 fpm, at any height, -20°C to +30°C, + 300 fpm

+ 200 fpm, on the ground, -20°C to +50°C, + 300 fpm

+ 250 fpm, at any height, -20°C to +50°C, + 300 fpm

10. Because the VSI measures rates of change of static pressure and not actual values of static pressure, position error:

never affects VSI indications

may cause errors in the VSI during the take-off run.

may cause errors in VSI indications whenever airspeed is changed, if at the same time there is a change in position error.

may cause errors in VSI indications whenever airspeed is changed, even if there is no change in position error.

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