[Code of Federal Regulations]
[Title 14, Volume 1]
[Revised as of January 1, 2004]
From the U.S. Government Printing Office via GPO Access
[CITE: 14CFR27.79]

[Page 564-565]
 
                     TITLE 14--AERONAUTICS AND SPACE
 
CHAPTER I--FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION
 
PART 27--AIRWORTHINESS STANDARDS: NORMAL CATEGORY ROTORCRAFT--Table of Contents
 
                            Subpart B--Flight
 
Sec. 27.79  Limiting height--speed envelope.

    (a) If there is any combination of height and forward speed 
(including hover) under which a safe landing cannot be made under the 
applicable power failure condition in paragraph (b) of this section, a 
limiting height-speed envelope must be established (including all 
pertinent information) for that condition, throughout the ranges of--
    (1) Altitude, from standard sea level conditions to the maximum 
altitude capability of the rotorcraft, or 7,000 feet, whichever is less; 
and
    (2) Weight, from the maximum weight (at sea level) to the lesser 
weight selected by the applicant for each altitude covered by paragraph 
(a)(1) of this section. For helicopters, the weight at altitudes above 
sea level may not be less than the maximum weight or the highest weight 
allowing

[[Page 565]]

hovering out of ground effect which is lower.
    (b) The applicable power failure conditions are--
    (1) For single-engine helicopters, full autorotation;
    (2) For multiengine helicopters, one engine inoperative (where 
engine isolation features insure continued operation of the remaining 
engines), and the remaining engines at the greatest power for which 
certification is requested, and
    (3) For other rotocraft, conditions appropriate to the type.

(Secs. 313(a), 601, 603, 604, Federal Aviation Act of 1958 (49 U.S.C. 
1354(a), 1421, 1423, 1424), sec. 6(c), Dept. of Transportation Act (49 
U.S.C. 1655(c)))

[Doc. No. 5074, 29 FR 15695, Nov. 24, 1964, as amended by Amdt. 27-14, 
43 FR 2324, Jan. 16, 1978; Amdt. 27-21, 49 FR 44433, Nov. 6, 1984]

                         Flight Characteristics