TBAS Instrument Comprehension 3

Question 1

If the airspeed indicator fails to register any increase during a takeoff roll despite full engine power, the most likely cause is:

Accepted Answer

A blocked pitot tube

Answer

The pitot tube provides ram (dynamic) pressure to the airspeed indicator, so a blockage prevents the indicator from registering increasing airspeed.

Question 2

When the static port becomes blocked in level flight, which group of instruments is affected?

Accepted Answer

Airspeed indicator, altimeter, and VSI

Answer

The altimeter, VSI, and airspeed indicator all rely on static port pressure as a reference, so a blockage affects all three simultaneously.

Question 3

Setting an altimeter to 29.92 inHg causes it to read which type of altitude?

Accepted Answer

Pressure altitude

Answer

Setting the altimeter to 29.92 inHg (the standard sea-level pressure) causes it to indicate pressure altitude, which is height above the standard pressure datum.

Question 4

During flight, the attitude indicator shows wings level and the heading indicator confirms no turn. However, the turn coordinator shows a left bank. The pilot should suspect:

Accepted Answer

The turn coordinator is malfunctioning

Answer

When two independent instruments agree that no turn is occurring, the single disagreeing instrument is most likely malfunctioning.

Question 5

An instrument scan shows decreasing airspeed, a nose-high attitude on the attitude indicator, and a positive climb rate on the VSI. This combination most likely indicates:

Accepted Answer

The aircraft is approaching a stall

Answer

Decreasing airspeed combined with a nose-high attitude and a climbing VSI reading are classic indicators of an aircraft approaching a power-off stall.

TBAS - Test of Basic Aviation Skills Practice Test

TBAS - Test of Basic Aviation Skills Practice Test

TBAS Instrument Comprehension 3