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San Remo Manual on International Law Applicable to Armed Conflicts at Sea, 12 June 1994
PRECAUTIONS REGARDING CIVIL AIRCRAFT
SECTION VI : PRECAUTIONS REGARDING CIVIL AIRCRAFT
72. Civil aircraft should avoid areas of potentially hazardous military activity.
73. In the immediate vicinity of naval operations, civil aircraft shall comply with instructions from the belligerents regarding their heading and altitude.
74. Belligerent and neutral States concerned, and authorities providing air traffic services, should establish procedures whereby commanders of warships and military aircraft are aware on a continuous basis of designated routes assigned to or flight plans filed by civil aircraft in the area of military operations, including information on communication channels, identification modes and codes, destination, passengers and cargo.
75. Belligerent and neutral States should ensure that a Notice to Airmen (NOTAM) is issued providing information on military activities in areas potentially hazardous to civil aircraft, including activation of danger areas or temporary airspace restrictions. This NOTAM should include information on:
(a) frequencies upon which the aircraft should maintain a continuous listening watch;
(b) continuous operation of civil weather-avoidance radar and identification modes and codes;
(c) altitude, course and speed restrictions;
(d) procedures to respond to radio contact by the military forces and to establish two-way communications;
(e) possible action by the military forces if the NOTAM is not complied with and the civil aircraft is perceived by those military forces to be a threat.
76. Civil aircraft should file the required flight plan with the cognizant Air Traffic Service, complete with information as to registration, destination, passengers, cargo, emergency communication channels, identification modes and codes, updates en route and carry certificates as to registration, airworthiness, passengers and cargo. They should not deviate from a designated Air Traffic Service route or flight plan without Air Traffic Control clearance unless unforeseen conditions arise, e.g., safety or distress, in which case appropriate notification should be made immediately.
77. If a civil aircraft enters an area of potentially hazardous military activity, it should comply with relevant NOTAMs. Military forces should use all available means to identify and warn the civil aircraft, by using,
, secondary surveillance radar modes and codes, communications, correlation with flight plan information, interception by military aircraft, and, when possible, contacting the appropriate Air Traffic Control facility.