Quantcast Figure 4.4-2 Standard Lapse Rate

 

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RULE High
Low
High
Low
-or-
"High to Low LOOK OUT BELOW"
On the other hand, if you fail to reset your altimeter with a current altimeter setting and you
are flying from a low-pressure area, then
Low pressure to High pressure, your altimeter indicates
Low but the aircraft is actually Higher
P
P
ALT
A/C
RULE -- Low
High
Low
High
-or-
"Low to High PLENTY OF SKY"
STANDARD DAY
A "Standard Day" is defined as a barometric pressure of 29.92 inches of mercury (Hg) and
the Outside Air Temperature (OAT) is +15 degrees centigrade at Mean Sea Level (MSL).
As the aircraft increases in altitude, temperature and pressure should decrease.
Theoretically, these decreases in pressure and temperature will occur at the "Standard
Lapse Rate" (Figure 4.4-2), which is a temperature decrease of 2 degrees centigrade and
pressure drop of 1" Hg for each 1,000 feet increase in altitude.
Figure 4.4-2 Standard Lapse Rate
4.6-92


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