Sec. 21.404  Terms of grant; general limitations.

    (a) Developmental authorizations normally shall be issued for one 
year, or such shorter term as the Commission may deem appropriate in any 
particular case, and shall be subject to cancellation without hearing by 
the Commission at any time upon notice to the licensee.
    (b) Where some phases of the developmental program are not covered 
by the general rules of the Commission or by the rules of this part, the 
Commission may specify supplemental or additional requirements or 
conditions in each case as it may deem necessary in the public interest, 
convenience or necessity.
    (c) Frequencies allocated to the service toward which such 
development is directed will be assigned for developmental operation on 
the basis that no interference will be caused to the regular services of 
stations operating in accordance with the Commission's Table of 
Frequency Allocations (Sec. 2.106 of this chapter).
    (d) The rendition of communication service for hire is not permitted 
under any developmental authorizations unless specifically authorized by 
the Commission.
    (e) The grant of a developmental authorization carries with it no 
assurance that the developmental program, if successful, will be 
authorized on a permanent basis either as to the service involved or the 
use of the frequencies assigned or any other frequencies.