[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: 14CFR33.68]



[Page 779]

 

                     TITLE 14--AERONAUTICS AND SPACE

 

CHAPTER I--FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION

 

PART 33_AIRWORTHINESS STANDARDS: AIRCRAFT ENGINES--Table of Contents

 

       Subpart E_Design and Construction; Turbine Aircraft Engines

 

Sec. 33.68  Induction system icing.



    Each engine, with all icing protection systems operating, must--

    (a) Operate throughout its flight power range (including idling) 

without the accumulation of ice on the engine components that adversely 

affects engine operation or that causes a serious loss of power or 

thrust in continuous maximum and intermittent maximum icing conditions 

as defined in appendix C of Part 25 of this chapter; and

    (b) Idle for 30 minutes on the ground, with the available air bleed 

for icing protection at its critical condition, without adverse effect, 

in an atmosphere that is at a temperature between 15[deg] and 30 [deg]F 

(between -9[deg] and -1 [deg]C) and has a liquid water content not less 

than 0.3 grams per cubic meter in the form of drops having a mean 

effective diameter not less than 20 microns, followed by a momentary 

operation at takeoff power or thrust. During the 30 minutes of idle 

operation the engine may be run up periodically to a moderate power or 

thrust setting in a manner acceptable to the Administrator.



[Amdt. 33-6, 39 FR 35466, Oct. 1, 1974, as amended by Amdt. 33-10, 49 FR 

6852, Feb. 23, 1984]