PPL PPL Flight Instruments and Weather

Question 1

What does the altimeter measure and what errors can affect its accuracy?

Accepted Answer

Atmospheric pressure to indicate altitude; errors include non-standard temperature, pressure setting errors, and instrument lag

Answer

The altimeter measures atmospheric pressure and converts it to altitude indication. Errors include incorrect pressure setting (altimeter setting), non-standard temperatures (cold: lower than indicated), and instrument lag during rapid altitude changes.

Question 2

What are the minimum weather requirements for VFR flight in Class G airspace below 1,200 feet AGL during the day?

Accepted Answer

1 statute mile visibility and clear of clouds

Answer

In Class G airspace below 1,200 feet AGL during the day, VFR minimums are 1 statute mile flight visibility with clear of clouds requirement, the least restrictive VFR weather minimums.

Question 3

What causes a stall in an aircraft?

Accepted Answer

Exceeding the critical angle of attack, disrupting airflow over the wing — this can occur at any airspeed and attitude

Answer

A stall occurs when the wing exceeds its critical angle of attack (typically 16-20°), causing airflow separation over the upper surface and loss of lift. It can occur at any airspeed, attitude, or power setting.

Question 4

What is the magnetic compass's turning errors?

Accepted Answer

In the Northern Hemisphere: leads on turns from N, lags on turns from S (UNOS: Undershoot North, Overshoot South)

Answer

Due to the Earth's magnetic field dip, the compass leads (indicates a turn before it occurs) when turning from northerly headings and lags when turning from southerly headings in the Northern Hemisphere.

Question 5

What information is provided in a METAR weather report?

Accepted Answer

Station, time, wind, visibility, weather phenomena, sky conditions, temperature/dewpoint, and altimeter setting

Answer

METAR reports include station identifier, observation time, wind direction/speed/gusts, visibility, present weather phenomena, sky condition (cloud layers), temperature and dewpoint, altimeter setting, and remarks.

(PPL) Private Pilot Licence Practice Test

(PPL) Private Pilot Licence Practice Test

PPL PPL Flight Instruments and Weather