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Federal Aviation Regulation Appendix I to Part 25 - Installation of an Automatic Takeoff Thrust Control System (ATTCS)
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Appendix I to Part 25 — Installation of an Automatic Takeoff Thrust Control System (ATTCS)
I25.1 General.
I25.2 Definitions.
(b) Critical Time Interval. When conducting an ATTCS takeoff, the critical time interval is between V1minus 1 second and a point on the minimum performance, all-engine flight path where, assuming a simultaneous occurrence of an engine and ATTCS failure, the resulting minimum flight path thereafter intersects the Part 25 required actual flight path at no less than 400 feet above the takeoff surface. This time interval is shown in the following illustration:
I25.3 Performance and System Reliability Requirements.
I25.4 Thrust Setting.
I25.5 Powerplant Controls.
(a) In addition to the requirements of §25.1141, no single failure or malfunction, or probable combination thereof, of the ATTCS, including associated systems, may cause the failure of any powerplant function necessary for safety.
(2) Permit manual decrease or increase in thrust or power up to the maximum takeoff thrust or power approved for the airplane under existing conditions through the use of the power lever. For airplanes equipped with limiters that automatically prevent engine operating limits from being exceeded under existing ambient conditions, other means may be used to increase the thrust or power in the event of an ATTCS failure provided the means is located on or forward of the power levers; is easily identified and operated under all operating conditions by a single action of either pilot with the hand that is normally used to actuate the power levers; and meets the requirements of §25.777 (a), (b), and (c);
I25.6 Powerplant Instruments.
In addition to the requirements of §25.1305:
[Amdt. 25–62, 52 FR 43156, Nov. 9, 1987]
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