Chapter 2 — PRESSURE 



pressure altitude. Both sides of the computer 

 are used. The sea-level-pressure side of the 

 computer has scales in millibars and in inches 

 of mercury printed on the base plate and an 

 "r" factor scale printed on the plastic rotor 

 disc. The altimeter- setting/pressure-altitude 

 side has a scale in inches of mercury on the base 

 plate and a height scale in feet printed on the 

 plastic rotor disc. Instructions for the operation 

 of it are printed on the computer. (See fig. 2-11.) 



DENSITY ALTITUDE 

 COMPUTER CP-718/UM 



Helicopters have their greatest lift and attain 

 highest speeds in air of high density. Thus, 

 pilots of these craft prefer to fly under con- 

 ditions of low temperature and high pressure, 

 since this is when the air is most dense. Pilots 

 of jet aircraft have a great interest in the density 

 of the air because air density not only affects 



OIW POINT If MP r 





rf 



rt* ^0ffi™W 



»f* 



'»>> 



**, 



«SB, 



Ojjf 



%. 



S, 



ftr * 



Ifc. 





C ' r 'C 



DENSITY ALTITUDE 

 COMPUTER 



_,L * 





FSN 6660-955-087} 

 CONTRACT NO N00383-73-C 

 CP-7I8/UM MFR-S P/N FAS-54 

 FUSENTHAl INSTRUMENTS 

 CHICAGO, III. 60656 



CO 



209.380 



Figure 2-12,-Density altitude computer CP-718/UM. 



31 



