022.02 Measurement of Air Data Parameters

Question 1

The Air Data Computer uses (TAT/SAT), static pressure and (dynamic/total) pressure as input data.

Answer 1

The Air Data Computer uses (TAT), static pressure and (total) pressure as input data.

Question 2

For a VSI during climb, the pressure inside the capsule drops (faster/slower)​ than the pressure inside the case.

Answer 2

For a VSI during climb, the pressure inside the capsule drops (faster) than the pressure inside the case.

Question 3

A servo-assisted altimeter is more accurate than a simple altimeter because the small movements of the (pointers/capsules)​ are detected by a very sensitive electro-magnetic pick-off.

Answer 3

A servo-assisted altimeter is more accurate than a simple altimeter because the small movements of the (capsules) are detected by a very sensitive electro-magnetic pick-off.

Question 4

The recovery factor of a flush bulb temperature sensor generally varies from (0.35 to 0.50/0.50 to 0.75/0.75 to 0.90/0.90 to 1.00)​.

Answer 4

The recovery factor of a flush bulb temperature sensor generally varies from (0.75 to 0.90).

Question 5

At sea level, on a typical servo altimeter the tolerance from indicated altitude is +/-(30/60/70/75)​ ft.

Answer 5

At sea level, on a typical servo altimeter the tolerance from indicated altitude is +/-(30) ft.

Question 6

Compressibility error must be taken into account when TAS is greater than approximately (…)​ kts.

Answer 6

Compressibility error must be taken into account when TAS is greater than approximately (200) kts.

Question 7

V_MO is calculated from (CAS/EAS/TAS)​.

Answer 7

VMO is calculated from (EAS).

Question 8

Ram air temperature

Answer 8

RAT = SAT • (1 + 0.2 + K_r + M²)

• RAT = total air temperature [K]*
• SAT = static air temperature [K] (= OAT)*
• K_r = recovery factor*
• M = Mach number*

Question 9

Within a temperature range of -20°C to +50°C, a VSI is accurate to within limits of +/-(…)​ ft/min.

Answer 9

Within a temperature range of -20°C to +50°C, a VSI is accurate to within limits of +/-(200) ft/min.

- +/- 300 ft/min outside this range -

Question 10

Lag error in an Instantaneous VSI is virtually eliminated by using a(n) (logarithmic scale/acceleration pump/servomotor)​.

Answer 10

Lag error in an Instantaneous VSI is virtually eliminated by using a(n) (acceleration pump).

Question 11

TAT is (lower/higher or equal) to SAT, depending on (altitude/Mach number)​ and SAT.

Answer 11

TAT is (higher or equal) to SAT, depending on (Mach number) and SAT.

Question 12

Position error of an altimeter causes the sensed static pressure to be (higher/lower) than the true static pressure.

Answer 12

Position error of an altimeter causes the sensed static pressure to be (lower) than the true static pressure.

Question 13

The outside air temperature probe measures the (total/static) air temperature minus (kinetic heating/compressibility) effects in order to obtain the static temperature.

Answer 13

The outside air temperature probe measures the (total) air temperature minus (kinetic heating) effects in order to obtain the static temperature.

Question 14

To be as accurate as possible, an airspeed indicator must be calibrated according to the (Saint-Venant/Bernoulli) formula, taking into acount the air (as an uncompressible fluid/compressibility)​.

Answer 14

To be as accurate as possible, an airspeed indicator must be calibrated according to the (Saint-Venant) formula, taking into acount the air (compressibility).

Question 15

Mach number is defined as the ration between (…) pressure to (…)​ pressure.

Answer 15

Mach number is defined as the ration between (dynamic) pressure to (static) pressure.

- M = (P_t - P_s) / P_s -