Jan 31

METAR and TAF wind direction

Pages 68, 69, and 74: Wind direction for METARS and TAFS are incorrectly defined as magnetic. All print wind directions are TRUE. Spoken wind directions (e.g. on ATIS or as given by ATC) are magnetic.

Jan 31

VOTs point north

Page 8: When checking a VOR using a VOT, the needle should point within 4 degrees of north with a FROM indication, and 4 degrees of south with a TO indication.

Jan 31

Class A airspace starts at 18000 MSL, not “above FL180″

Page 43: While the definition given in Chapter 3 is simple to understand, it’s not technically correct. Class A airspace starts at 18,000 feet MSL. [Note: This is why FL180 is sometimes unavailable. "Flight level" refers to what the altimeter reads (in hundreds of feet) when set to standard pressure (29.92). When ambient air pressure is lower than this, flight level 180 goes below 18,000 feet, thereby not providing 500-foot separation from VFR aircraft flying at 17,500.]

Jan 31

Typo and Poor Arithmetic

Page 171: The text currently reads, “”If the arrival aircraft is going 180 knots ground speed, and needs to descend to 8,000 feet at 500 feet per minute, that will require 16 minutes and 42 nautical miles of distance.” It should say that the aircraft is descending 8,000 feet (not TO 8,000) and will require 48 miles of distance, because [8000/500] x 3 is 48 where I went to school.