Federal Register - March 25, 2021
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Source: Federal Register
Federal Register / Vol. 86, No. 56 / Thursday, March 25, 2021 / Rules and Regulations
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Engine failed, ATTCS operating
25.121 d Gradient Requirement
" The engine and ATTCS failed time Interval muat be no lhorter than the time lnteival from the point or simultaneous engine and ATTCS falure to a height or 400 feet used to comply with 125.2b fOr A TICS use during takeoff.
Figure 1: Go-around ATTCS
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125,Zb Tim Interval FG
lleliht above nmway
.urlai ft.
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Critical time
bltenal
BILLING CODE 491013C
The all-engines-operating go-around flight path, and the part 25 one-engineinoperative approach-climb gradient flight path engine failed, ATTCS
operating path in Figure 1, originate from a common point, point C, on a 2.5-
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degree approach path. The period of time, time interval DE, from the point of simultaneous engine and ATTCS
failure, point D, to the intersection of these flight paths, point E, must be no
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shorter than the corresponding time in Figure 2, above.
d. The critical time interval AD is illustrated in Figure 1.
3. Performance and system reliability requirements: The applicant must comply with the performance and
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25MRR1
ER25MR21.002
Figure 2: Appendix I25.2b, "Critical Time Interval" ATTCS takeoff
