[Code of Federal Regulations]
[Title 47, Volume 5]
[Revised as of October 1, 2003]
From the U.S. Government Printing Office via GPO Access
[CITE: 47CFR87.71]

[Page 236-237]
 
                       TITLE 47--TELECOMMUNICATION
 
                         COMMISSION (CONTINUED)
 
PART 87_AVIATION SERVICES--Table of Contents
 
             Subpart C_Operating Requirements and Procedures
 
Sec.  87.71  Frequency measurements.

    A licensed operator must measure the operating frequencies of all 
land-based transmitters at the following times:

[[Page 237]]

    (a) When the transmitter is originally installed;
    (b) When any change or adjustment is made in the transmitter which 
may affect an operating frequency; or
    (c) When an operating frequency has shifted beyond tolerance.