[Code of Federal Regulations]

[Title 14, Volume 1]

[Revised as of January 1, 2006]

From the U.S. Government Printing Office via GPO Access

[CITE: 14CFR27.79]



[Page 573-574]

 

                     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 574]]



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