[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: 14CFR121.101]

[Page 352-353]
 
                     TITLE 14--AERONAUTICSAND SPACE
 
CHAPTER I--FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION 
                               (CONTINUED)
 
PART 121--OPERATING REQUIREMENTS: DOMESTIC, FLAG, AND SUPPLEMENTAL
 OPERATIONS--Table of Contents
 
       Subpart E--Approval of Routes: Domestic and Flag Operations
 
Sec. 121.101  Weather reporting facilities.

    (a) Each certificate holder conducting domestic or flag operations 
must show that enough weather reporting services are available along 
each route to ensure weather reports and forecasts necessary for the 
operation.

[[Page 353]]

    (b) Except as provided in pararaph (d) of this section, no 
certificate holder conducting domestic or flag operations may use any 
weather report to control flight unless--
    (1) For operations within the 48 contiguous States and the District 
of Columbia, it was prepared by the U.S. National Weather Service or a 
source approved by the U.S. National Weather Service; or
    (2) For operations conducted outside the 48 contiguous States and 
the District of Columbia, it was prepared by a source approved by the 
Administrator.
    (c) Each certificate holder conducting domestic or flag operations 
that uses forecasts to control flight movements shall use forecasts 
prepared from weather reports specified in paragraph (b) of this section 
and from any source approved under its system adopted pursuant to 
paragraph (d) of this section.
    (d) Each certificate holder conducting domestic or flag operations 
shall adopt and put into use an approved system for obtaining forecasts 
and reports of adverse weather phenomena, such as clear air turbulence, 
thunderstorms, and low altitude wind shear, that may affect safety of 
flight on each route to be flown and at each airport to be used.

[Doc. No. 6258, 29 FR 19194, Dec. 31, 1964, as amended by Amdt. 121-27, 
36 FR 13911, July 28, 1971; Amdt. 121-134, 42 FR 27573, May 31, 1977; 
Amdt. 121-253, 61 FR 2610, Jan. 26, 1996]