[Code of Federal Regulations]
[Title 14, Volume 2]
[Revised as of January 1, 2007]
From the U.S. Government Printing Office via GPO Access
[CITE: 14CFR139.307]

[Page 1173-1174]
 
                     TITLE 14--AERONAUTICS AND SPACE
 
CHAPTER I--FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION 
                               (CONTINUED)
 
PART 139_CERTIFICATION OF AIRPORTS--Table of Contents
 
                          Subpart D_Operations
 
Sec.  139.307  Unpaved areas.

    (a) In a manner authorized by the Administrator, each certificate 
holder must maintain and promptly repair the surface of each gravel, 
turf, or other unpaved runway, taxiway, or loading ramp and parking area 
on the airport that is available for air carrier use as follows:
    (1) No slope from the edge of the full-strength surfaces downward to 
the existing terrain must be steeper than 2:1.
    (2) The full-strength surfaces must have adequate crown or grade to 
assure sufficient drainage to prevent ponding.

[[Page 1174]]

    (3) The full-strength surfaces must be adequately compacted and 
sufficiently stable to prevent rutting by aircraft or the loosening or 
build-up of surface material, which could impair directional control of 
aircraft or drainage.
    (4) The full-strength surfaces must have no holes or depressions 
that exceed 3 inches in depth and are of a breadth capable of impairing 
directional control or causing damage to an aircraft.
    (5) Debris and foreign objects must be promptly removed from the 
surface.
    (b) FAA Advisory Circulars contain methods and procedures for the 
maintenance and configuration of unpaved areas that are acceptable to 
the Administrator.