[Code of Federal Regulations]
[Title 14, Volume 1]
[Revised as of January 1, 2003]
From the U.S. Government Printing Office via GPO Access
[CITE: 14CFR25.529]

[Page 383-384]
 
                     TITLE 14--AERONAUTICS AND SPACE
 
CHAPTER I--FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION
 
PART 25--AIRWORTHINESS STANDARDS: TRANSPORT CATEGORY AIRPLANES--Table of Contents
 
                          Subpart C--Structure
 
Sec. 25.529  Hull and main float landing conditions.

    (a) Symmetrical step, bow, and stern landing. For symmetrical step, 
bow, and stern landings, the limit water reaction load factors are those 
computed under Sec. 25.527. In addition--
    (1) For symmetrical step landings, the resultant water load must be 
applied at the keel, through the center of gravity, and must be directed 
perpendicularly to the keel line;
    (2) For symmetrical bow landings, the resultant water load must be 
applied at the keel, one-fifth of the longitudinal distance from the bow 
to the step, and must be directed perpendicularly to the keel line; and
    (3) For symmetrical stern landings, the resultant water load must be 
applied at the keel, at a point 85 percent of the longitudinal distance 
from the step to the stern post, and must be directed perpendicularly to 
the keel line.
    (b) Unsymmetrical landing for hull and single float seaplanes. 
Unsymmetrical step, bow, and stern landing conditions must be 
investigated. In addition--
    (1) The loading for each condition consists of an upward component 
and a side component equal, respectively, to 0.75 and 0.25 tan [beta] 
times the resultant load in the corresponding symmetrical landing 
condition; and
    (2) The point of application and direction of the upward component 
of the load is the same as that in the symmetrical condition, and the 
point of application of the side component is at the same longitudinal 
station as the

[[Page 384]]

upward component but is directed inward perpendicularly to the plane of 
symmetry at a point midway between the keel and chine lines.
    (c) Unsymmetrical landing; twin float seaplanes. The unsymmetrical 
loading consists of an upward load at the step of each float of 0.75 and 
a side load of 0.25 tan [beta] at one float times the step landing load 
reached under Sec. 25.527. The side load is directed inboard, 
perpendicularly to the plane of symmetry midway between the keel and 
chine lines of the float, at the same longitudinal station as the upward 
load.