Describe altimeter settings and setting procedures and the importance of accurate altimeters.

Description should include the following:

Most altimeters are equipped with a barometric pressure setting window (or Kollsman window) providing a means to adjust the altimeter. A knob is located at the bottom of the instrument for this adjustment.
To adjust the altimeter for variation in atmospheric pressure, the pressure scale in the altimeter setting window, which is calibrated in inches of mercury ("Hg) and/or millibars (mb), is adjusted to match the given altimeter setting.
Altimeter setting is defined as station pressure reduced to sea level, but an altimeter setting is accurate only in the vicinity of the reporting station.
The pilot must be sure that the aircraft is flying high enough to clear the highest terrain or obstruction along the intended route.
It is especially important to have accurate altitude information when visibility is restricted.

PLT166 and PLT167

Process/Skill Questions: