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Federal Register / Vol. 86, No. 56 / Thursday, March 25, 2021 / Rules and Regulations
Administrator, the following special conditions are issued as part of the type certification basis for MITAC Model MRJ200 airplanes.
1. The MITAC Model MRJ200
airplane must comply with the requirements of 14 CFR 25.904, and appendix I, and the following requirements for the go-around phase of flight:
2. Definitions a. Takeoff/go-around TOGA:
Throttle lever in takeoff or go-around position.
b. Automatic Takeoff Thrust Control System: The ATTCS in MITAC Model MRJ200 airplanes is defined as the entire automatic system available during takeoff and in go-around mode, including all devices, both mechanical and electrical, that sense engine failure, transmit signals, actuate fuel controls or power levers or increase engine power by other means on operating engines to achieve scheduled thrust or power increase, and furnish cockpit information on system operation.
c. Critical time interval:

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1 When conducting an approach for landing using ATTCS, the critical time interval is defined as follows:
i The critical time interval begins at a point on a 2.5-degree approach glide path from which, assuming a simultaneous engine and ATTCS
failure, the resulting approach-climb flight path intersects a flight path originating at a later point on the same approach path that corresponds to the part 25 one-engine-inoperative approach-climb gradient. The period of time from the point of simultaneous engine and ATTCS failure, to the intersection of these flight paths, must be no shorter than the time interval used in evaluating the critical time interval for takeoff, beginning from the point of simultaneous engine and ATTCS failure and ending upon reaching a height of 400 feet.
ii The critical time interval ends at the point on a minimum performance, all-engines-operating go-around flight path from which, assuming a simultaneous engine and ATTCS
failure, the resulting minimum
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approach-climb flight path intersects a flight path corresponding to the part 25
minimum one-engine-inoperative approach-climb gradient. The allengines-operating go-around flight path, and the part 25 one-engine-inoperative approach-climb gradient flight path, originate from a common point on a 2.5degree approach path. The period of time from the point of simultaneous engine and ATTCS failure, to the intersection of these flight paths, must be no shorter than the time interval used in evaluating the critical time interval for the takeoff, beginning from the point of simultaneous engine and ATTCS
failure and ending upon reaching a height of 400 feet.
2 The critical time interval must be determined at the altitude resulting in the longest critical time interval for which one-engine-inoperative approachclimb performance data are presented in the airplane flight manual.
3 The critical time interval is illustrated in Figure 1:
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