text: the case of the single-engine airplane, 
  power-plant failure leaves only the alternatives 
  of effecting a successful power-off landing or 
  In the case of the 
  abandoning the airplane. 
  multiengine airplane, the failure of a power- 
  plant does nor necessarily constitute a disaster 
  since flight may be continued with the remain- 
  ing powerplants functioning. However, the 
  performance of the multiengine airplane with 
  a powerplant inoperative may be critical for 
  certain conditions of flight and specific tech- 
  niques and procedures must be observed to 
  obtain adequate performance. 
  
  In 
  
  The effect of a powerplant failure on the 
  multiengine turbojet airplane is illustrated by 
  the first chart of figure 6.8 with 
  the variation 
  of required and available thrust with velocity. 
  If half of the airplane powerplants are inoper- 
  ative, e.g., single-engine operation of a twin- 
  engine airplane, the maximum thrust available 
  at each velocity is reduced to half that avail- 
  able prior to the engine failure. The variation 
  of 
  velocity may be 
  affected by the failure of a powerplant in that 
  there may be significant increases in drag if 
  followed. The 
  specific procedures are not 
  inoperative powerplant may contribute addi- 
  tional drag and the pilot must insure that the 
  In the 
  additional drag is held to a minimum. 
  case of the propeller powered airplane, the 
  propeller must be feathered, cowl flaps closed. 
  etc., as the increased drag will detract con- 
  siderably from the performance. 