47 C.F.R. § 87.397 – Emergency operations.

(a) The licensee of any land station in the Aviation services, during a local emergency involving the safety of life and property may communicate in a manner other than that specified in the license (See § 87.395). Such emergency operations may include operation at other locations or with equipment not specified in the license or by unlicensed personnel provided that:
1. (1) Such operations are under the control and supervision of the station licensee,
2. (2) The emergency use is discontinued as soon as practicable upon termination of the emergency,
3. (3) In no event shall any station transmit on frequencies other than or with power in excess of that specified in the license,
4. (4) The details of the emergency must be retained with the station license, and
5. (5) At a controlled airport these communications must be coordinated with the FAA.
(b) The unicom frequencies listed in subpart G may also be used for communications with private aircraft engaged in organized civil defense activities in preparation for, during an enemy attack or immediately after an enemy attack. When used for these purposes, unicoms may be moved from place to place or operated at unspecified locations, except at landing areas served by other unicoms or control towers.
(c) In any case in which a license for unattended operation has been granted, the Commission may at any time, for national defense, modify the license.