[Code of Federal Regulations]
[Title 14, Volume 2]
[Revised as of January 1, 2003]
From the U.S. Government Printing Office via GPO Access
[CITE: 14CFR139.307]

[Page 781]
 
                     TITLE 14--AERONAUTICSAND SPACE
 
CHAPTER I--FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION 
                               (CONTINUED)
 
PART 139--CERTIFICATION AND OPERATIONS: LAND AIRPORTS SERVING CERTAIN 
AIR CARRIERS--Table of Contents
 
                          Subpart D--Operations
 
Sec. 139.307  Unpaved areas.

    (a) Each certificate holder shall maintain and promptly repair the 
surface of each gravel, turf, or other unpaved runway, taxiway, or 
loading ramp and parking area on the airport which is available for air 
carrier use as follows:
    (1) No slope from the edge of the full-strength surfaces downward to 
the existing terrain shall be steeper than 2:1.
    (2) The full-strength surfaces shall have adequate crown or grade to 
assure sufficient drainage to prevent ponding.
    (3) The full-strength surfaces shall be adequately compacted and 
sufficiently stable to prevent rutting by aircraft, or the loosening or 
buildup of surface material which could impair directional control of 
aircraft or drainage.
    (4) The full-strength surfaces must have no holes or depressions 
which 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 shall be promptly removed from the 
surface.
    (b) Standards and procedures for the maintenance and configuration 
of unpaved full-strength surfaces shall be included in the airport 
certification manual or the airport certification specifications, as 
appropriate, for compliance with this section.