(2) Issue advisories to all known aircraft that will transit the airspace within which the jump
operations will be conducted. Advisories shall consist of the location, time, duration, and altitude from
which the jump will be made.
(3) When time or numbers of aircraft make individual transmissions impractical, you may
broadcast advisories to nonparticipating aircraft on proper control frequencies or, when available, the
automatic terminal information service.
(4) When requested by the pilot, and when possible, help nonparticipating aircraft in
avoiding the jump areas.
ISSUE SAFETY ALERT
a. Issue a safety alert to an aircraft if you are aware the aircraft is at an altitude that, in your
judgment, places it in unsafe proximity to terrain, obstruction, or other aircraft. Once the pilot informs
you that action is being taken to resolve the situation, you may end the issuance of further alerts. Do not
assume that because someone else has responsibility for the aircraft that the unsafe situation has been
observed and the safety alert issued; inform the proper controller.
b. The issuance of a safety alert is a first priority once the controller observes and recognizes a
situation of unsafe aircraft proximity to terrain, obstacles, or uncontrolled aircraft. Conditions such as
work load, traffic volume, the quality or limitations of the radar system, and the available lead time to
react are factors in determining whether it is reasonable for the controller to observe and recognize such
situations. While a controller cannot immediately see the development of every situation where a safety
alert must be issued, the controller must remain constantly vigilant for such situations and issue a safety
alert when the situation is recognized. Once the alert is issued, it is solely the pilot's prerogative to
determine what course of action, if any, he will take.
ISSUE SIGNIFICANT METEOROLOGICAL (SIGMET) ALERT ADVISORIES
a. Broadcast a SIGMET alert once on all frequencies, except emergency, when any part of the
area described is within 150 miles of the airspace under your jurisdiction. The broadcast is not required
if aircraft on your frequencies will not be affected.
b. Terminal facilities have the option to limit the broadcast. Tower cab and approach control
positions may opt to broadcast alerts only when any part of the area described is within 50 miles of the
airspace under their jurisdiction.