[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: 14CFR27.45]



[Page 571-572]

 

                     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. 27.45  General.



    (a) Unless otherwise prescribed, the performance requirements of 

this subpart must be met for still air and a standard atmosphere.

    (b) The performance must correspond to the engine power available 

under the particular ambient atmospheric conditions, the particular 

flight condition, and the relative humidity specified in paragraphs (d) 

or (e) of this section, as appropriate.

    (c) The available power must correspond to engine power, not 

exceeding the approved power, less--

    (1) Installation losses; and



[[Page 572]]



    (2) The power absorbed by the accessories and services appropriate 

to the particular ambient atmopheric conditions and the particular 

flight condition.

    (d) For reciprocating engine-powered rotorcraft, the performance, as 

affected by engine power, must be based on a relative humidity of 80 

percent in a standard atmosphere.

    (e) For turbine engine-powered rotorcraft, the performance, as 

affected by engine power, must be based on a relative humidity of--

    (1) 80 percent, at and below standard temperature; and

    (2) 34 percent, at and above standard temperature plus 50 degrees F. 

Between these two temperatures, the relative humidity must vary 

linearly.

    (f) For turbine-engine-powered rotorcraft, a means must be provided 

to permit the pilot to determine prior to takeoff that each engine is 

capable of developing the power necessary to achieve the applicable 

rotorcraft performance prescribed in this subpart.



(Secs. 313(a), 601, 603, 604, and 605 of the Federal Aviation Act of 

1958 (49 U.S.C. 1354(a), 1421, 1423, 1424, and 1425); and sec. 6(c) of 

the Dept. of Transportation Act (49 U.S.C. 1655(c)))



[Amdt. 27-14, 43 FR 2324, Jan. 16, 1978, as amended by Amdt. 27-21, 49 

FR 44432, Nov. 6, 1984]