AC No: 91~53A
a. Close-in NADP,
(1) Initiate thrust cutback at an altitude of no less than 800 feet AFE and prior to initiation of flaps or slats retraction.
(2) The thrust cutback may be made by manual throttle reduction or by approved automat& means.The automatic means may be armed prior to takeoff for cutback at or above 800 feet AFE or may be pilot initiated at or above 800 feet APE.
(3) For airplanes without an operational automatic thrust restoration system, achieve and maintain no less than the thrust level necessary after thrust reduction to maintain, for the flaps/slats configuration of the airplane, the takeoff path engine-inoperative climb gradients specified in FAR Section 25.111(c)(3) in the event of an engine failure.
(4) For airplanes with an operational automatic thrust restoration system, achieve and maintain no less than the thrust level necessary after thrust reduction to maintain, for the flaps/slats configuration of the airplane, a takeoff path engine-inoperative climb gradient of zero percent, provided that the automatic thrust restoration system will, at a minimum, restore sufficient thrust to maintain the takeoff path engine-inoperative climb gradients specified in FAR Section 25.11 l(c)(3) in the event of an engine failure.
(5) During the thrust reduction, coordinate the pitchover rate and thrust reduction to provide a decrease in pitch consistent with allowing indicated airspeed to decay to no more than 5 knots below the all-engine target climb speed and, in no case to less than V2 for the airplane configuration. For automated throttle systems, acceptable speed tolerances can be found in AC 25-15, Approval of Flight Management Systems in Transport Category Airplanes.
(6) Maintain the speed and thrust criteria as described in subparagraph 6 a(3) through 6a(5) to 3,000 feet AFE or above, or until the airplane has been fully transitioned to the en route climb configuration (whichever occurs first), then transition to normal en route climb procedures.
b. Distant NADP.
(1) Initiate flaps/slats retraction prior to thrust cutback initiation. Thrust cutback is initiated at an altitude no less than 800 feet AFE.
(2) The thrust cutback may be made by manual throttle reduction or by approved automatic means. The automatic means may be armed prior to takeoff for cutback at or above 800 feet AFE or may be pilot initiated at or above 800 feet AFE.
(3) For airplanes without an operational automatic thrust restoration system, achieve and maintain no less than the thrust level necessary after thrust reduction to maintain, for the flaps/slats configuration of the airplane, the takeoff path engine-inoperative climb gradients specified in FAR Section 25.11 l(c)(3) in the event of an engine failure.
(4) For airplanes with an operational automatic thrust restoration system, achieve and maintain no less than the thrust level necessary after thrust reduction to maintain, for the flaps/slats configuration of the airplane, a takeoff path engine-inoperative climb gradient of zero percent, provided that the automatic thrust restoration system will, at a minimum, restore sufficient thrust to maintain the takeoff path engine-inoperative climb gradients specified in FAR Section 25.111 (c)(3) in the event of an engine failure.
(5) During the thrust reduction, coordinate the pitchover rate and thrust reduction to provide a decrease in pitch consistent with allowing indicated airspeed to decay to no more than 5 knots below the all-engine target climb speed and, in no case to less than V2 for the airplane configuration. For automated throttle systems, acceptable speed tolerances can be found in AC 25- 15, Approval of Flight Management Systems in Transport Category Airplanes.
(6) Maintain the speed and thrust criteria as described in subparagraph 6 b(3) through 6 b(5) to 3,000 feet AFF or above, or until the airplane has been fully transitioned to the en route climb configuration (whichever occurs first), then transition to normal en route climb procedures.
7. OPERATIONAL GUIDELINES.
a. Each airplane operator may apply the procedures specified in this AC to determine the following for each of its airplane types:
- (1) Close-in community NADP.
- (2) Distant community NADP.
- For each NADP, the airplane operator should specify the altitude AFE at which thrust reduction from takeoff thrust or airplane configuration change, excluding gear retraction, is initiated.
c. Each airplane operator should limit the number of NADP’s for any airplane type to no more than two.