You get 47 which you can now add to 298 to come up with 345 altitude correction. Subtract 298 from 392 to get 94 and then divide by 2 since 29.55 is directly in the middle. Looking at the above chart you will see that 29.65 is not actually shown so we will need to interpolate between 29.50 and 29.60. Determine the pressure altitude at an airport that is 1,386 feet MSL with an altimeter setting of 29.55. Let’s try a sample problem using the above chart.ġ. By applying a correction factor to the indicated altitude according to the reported “altimeter setting,” see figure below.By setting the barometric scale of the altimeter to 29.92 “Hg and reading the indicated altitude,.The pressure altitude can be determined by any of the three following methods: Pressure altitude is important as a basis for determining aircraft performance, as well as for assigning flight levels to aircraft operating at above 18,000 feet. As atmospheric pressure changes, the SDP may be below, at, or above sea level. The SDP is a theoretical level at which the pressure of the atmosphere is 29.92 “Hg and the weight of air is 14.7 psi. If the altimeter is set for 29.92 “Hg SDP, the altitude indicated is the pressure altitude-the altitude in the standard atmosphere corresponding to the sensed pressure.
The aircraft altimeter is essentially a sensitive barometer calibrated to indicate altitude in the standard atmosphere. Pressure altitude is the height above the standard datum plane (SDP).
0 kommentar(er)
