text: attack for the rotating blade with a subsequent 
  the 
  increase in pressure rise. Of course, if 
  change in angle of attack or pressure rise is 
  beyond some critical value, stall will occur. 
  While 
  the stall phenomenon of a series of 
  that 
  rotating compressor blades differs from 
  of a single airfoil section in a free airstream, 
  the cause and effect are essentially the same. 
  
  Thus, the recovery from a compressor stall 
  must entail reduction of throttle setting to 
  reduce fuel flow, lowering angle of attack and 
  sideslip and increasing airspeed to improve 
  inlet condition, and reducing altitude if high 
  altitude is a contributing factor. 
  
  (3) While the j7ameout is a rare occurrence 
  with modern engines, various malfunctions 
  and operating conditions allow the flameout to 
  remain a possibility. A uniform mixture of 
  fuel and air will sustain combustion within a 
  relatively wide range of fuel-air ratios. Com- 
  bustion can be sustained with a fuel-air ratio 
  as rich as one to five or as lean as one to twenty- 
  five. Fuel air ratios outside these limits will 
  not support combustion due to the deficiency 
  of air or deficiency of fuel. The characteristics 
  of the fuel nozzle and spray pattern as well as 
  the governing apoaratus must insure that the 
  nucleus of combt .,on is maintained through- 
  out the range of engine operation. 