[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: 14CFR25.239]

[Page 360-361]
 
                     TITLE 14--AERONAUTICS AND SPACE
 
CHAPTER I--FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION
 
PART 25--AIRWORTHINESS STANDARDS: TRANSPORT CATEGORY AIRPLANES--Table of Contents
 
                            Subpart B--Flight
 
Sec. 25.239  Spray characteristics, control, and stability on water.

    (a) For seaplanes and amphibians, during takeoff, taxiing, and 
landing, and in the conditions set forth in paragraph (b) of this 
section, there may be no--
    (1) Spray characteristics that would impair the pilot's view, cause 
damage, or result in the taking in of an undue quantity of water;
    (2) Dangerously uncontrollable porpoising, bounding, or swinging 
tendency; or

[[Page 361]]

    (3) Immersion of auxiliary floats or sponsons, wing tips, propeller 
blades, or other parts not designed to withstand the resulting water 
loads.
    (b) Compliance with the requirements of paragraph (a) of this 
section must be shown--
    (1) In water conditions, from smooth to the most adverse condition 
established in accordance with Sec. 25.231;
    (2) In wind and cross-wind velocities, water currents, and 
associated waves and swells that may reasonably be expected in operation 
on water;
    (3) At speeds that may reasonably be expected in operation on water;
    (4) With sudden failure of the critical engine at any time while on 
water; and
    (5) At each weight and center of gravity position, relevant to each 
operating condition, within the range of loading conditions for which 
certification is requested.
    (c) In the water conditions of paragraph (b) of this section, and in 
the corresponding wind conditions, the seaplane or amphibian must be 
able to drift for five minutes with engines inoperative, aided, if 
necessary, by a sea anchor.

                    Miscellaneous Flight Requirements