text: (2) Gross weight. 
  (3) Temperature--an additional correc- 
  tion for nonstandard temperatures to ac- 
  count for the thrust loss associated with 
  high compressor inlet air 
  temperature. 
  For this correction the ambient tempera- 
  ture at the runway conditions is appro- 
  priate rather than the ambient temperature 
  at some distant location. 
  
  (4) Wind. 
  
  In addition, corrections are necessary to ac- 
  count for runway slope, engine power defi- 
  ciencies, etc. 
  LANDING 
  
  In many 
  cases, the landing distance of an airplane will 
  define the runway 
  flying 
  operations. This is particularly 
  the case of 
  high speed ‘jet airplanes at low altitudes where 
  landing distance is the problem rather than 
  takeoff performance. The minimum landing 
  distance is obtained by landing at some mini- 
  mum safe velocity which allows sufficient mar- 
  gin above stall and provides satisfactory, con- 
  for waveoff Generally, 
  trol and capability 
  the landing speed is some fixed percentage of 
  the stall speed or minimum control speed for 
  the airplane in the landing configuration. As 
  such, the landing will be accomplished at 
  some particuIar value of ~lift coefficient and 
  angle of attack. The exact value of CL and 
  P for 
  landing will depend on the airplane 
  characteristics but, once defined, the values are 
  independent of weight, altitude, wind, etc. 
  Thus, an angle of attack indicator can be a 
  valuable aid during approach and landing. 
  
  PERFORMANCE. 