text: If the subject airplane is flown at a positive 
  load factor greater than the positive limit 
  load’ 
  factor of 7.5, structural damage will be possi- 
  ble. When the airplane is operated in this 
  region, objectionable permanent deformation 
  of the primary structure may take place and a 
  high rate of fatigue damage is incurred. Opera- 
  load factor must be 
  tion above the 
  avoided in normal operation. 
  If conditions of 
  extreme emergency require load factors above 
  the limit to prevent an immediate disaster, the 
  airplane should be capable of withstanding the 
  The 
  ultimate 
  failure. 
  load factor without 
  flight 
  same situation exists in negative lift 
  with the exception that the limit and ultimate 
  load factors are of smaller magnitude and the 
  negative limit load factor may not be the same 
  value at all airspeeds. At speeds above the 
  maximum level flight airspeed the negative 
  limit load factor may be of smaller magnitude. 
  The limit airspeed (or redline speed) is a de- 
  sign reference point for the airplane-the sub- 
  ject airplane is limited to 575 knots. 
  If flight 
  is attempted beyond the limit airspeed struc- 
  tural,idamage or structural failure may result 
  from a variety of phenomena. The airplane in 
  flight above the limit airspeed may encounter: 