Table 66 273 



NACA STANDARD ATMOSPHERE ALTITUDE-PRESSURE TABLE 



Table 66 gives the NACA standard atmosphere altitude in feet corresponding to the pressure 

 For each tenth of an inch of mercury, and provides an alternate method for computing the 

 'altimeter setting" defined in Table 65. 



To compute the altimeter setting: 



1. 



Determine the station elevation Hb in feet and the corresponding station pressure p in 

 inches of mercury. 



Subtract 0.01 in. Hg. from the station pressure obtaining (p — 0.01"). The purpose of 

 this is to correct for the fact that an aircraft altimeter is usually about 10 feet above 

 the landing gear. 



From Table 66, determine the altitude corresponding to (p — 0.01"), found in step 2. 

 Interpolate if necessary. 



Subtract the station elevation H* from the altitude found in step 3. 



Re-enter Table 66 with the difference found in step 4 as the tabular value. The cor- 

 responding pressure, to the nearest 0.01 inch of mercury, is the altimeter setting. 



.00 



feet 



.10 

 feet 



.20 



feet 



.30 



feet 



.40 



feet 



.50 

 feet 



.60 



feet 



.70 



feet 



.80 



.90 



SMITHSONIAN METEOROLOGICAL TABLES 



