With the IRS/INS/GPS or visually.

For every 1kg of air passing through the combustion chamber, 11kg of air pass bypass the combustion chamber.

A Fohn wind is a warm dry wind that blows down the lee side of a mountain.

Initially, the air temperature cools dry-adiabatically (3°C/1000 ft), until its dew point temperature is reached. Condensation occurs as the air is further forced up the mountain range, resulting in the air cooling saturated-adiabatically (generally considered in the mid-latitudes to be 1.8°C/1000 ft). Clouds and precipitation form. When the air mass reaches the top of the mountain range it has lost a significant amount of its water content and so has a much lower dew point temperature.

As the air then begins to descend down the lee slope of the mountain the compressed air is initially heated saturated-adiabatically, and in effect the direct reverse to the cooling effect on the windward side occurs. As the air continues leeward and downward from the mountain range, the air, now no longer saturated, is heated dry-adiabatically.

The resultant wind is dry and warm giving clear conditions at airfields on the lee side of the mountain range.

The Foehn Effect also may be associated with mountain wave activity.

Average range over land 20 - 25 miles.

Range for an NDB can be calculated with:

2√power output in Watts = Range (Land) 3√ power output in Watts = Range (Water)

A Mach trimmer is a system that artificially corrects for Mach tuck.

OM = DOM + crew and fuel

Because of the distance which has to be covered to reach 41.000 feet which may not be convenient for a short flight.

On long flights it is more typical to fly at 41.000 feet when the aircraft weight and performance allows.

Jeppesen charts and plates are simplified and uniform.

Due to the structural damage that may occur in thunderstorms, due to hail, severe turbulence and severe windshear.

Besides that, lightning strikes may cause damage to electrical systems and severe icing may occur.

Transmitting uses more power.