2. Turbojet aircraft operating along the specified routes between San Juan, Peru and Tongoy or Antofagasta (SCFZ), Chile, and on the specified routes between the W coast of Peru and Chile and the adjacent control areas of the Pacific Region shall adhere to the Mach number approved by Air Traffic Control and shall request Air Traffic Control approval before making any change thereto. If essential to make an immediate temporary change in the Mach number (e.g. due to turbulence), Air Traffic Control shall be notified as soon as possible that such a change has been made.
(ICAO 7030/4/SAM RAC 5.2.1)

ROUTE AND AREA RESTRICTIONS -
1. Refer to Chapter 1, Theater Supplementary Notices/Procedures, Route and Area Restrictions for USSOUTHCOM AOR Procedures.
(AFFSA/XOIA)

ADDITIONAL INFORMATION
1. SPECIAL PROCEDURES FOR INFLIGHT CONTINGENCIES
a. INTRODUCTION - The following procedures are intended for guidance only. Although all possible contingencies cannot be covered, they provide for such cases as inability to maintain assigned level due to weather, aircraft performance, pressurization failure and problems associated with high level supersonic flight. They are applicable primarily when rapid descent, turn-back, or both are required. The pilot's judgment shall determine the sequence of actions taken, having regard to the specific circumstances.
b. The following general procedures apply to both subsonic and supersonic aircraft.
(1)
If an aircraft is unable to continue flight in accordance with its Air Traffic Control clearance, a revised clearance shall, whenever possible, be obtained prior to initiating any action, using the radio telephony distress or urgency signal as appropriate.

(2)
If prior clearance cannot be obtained, an Air Traffic Control clearance shall be obtained at the earliest possible time and, in the meantime, the aircraft shall broadcast its position (including the Air Traffic Service Route Designator or the Track Code, as appropriate) and intentions, on 121.5 MHz at suitable intervals until Air Traffic Control clearance is received.

(ICAO 7030/4/SAM RAC 4.0)
2. FLIGHT INFORMATION SERVICE
a. Unless otherwise provided, area control centers shall have available for transmission to aircraft on request, immediately prior to descent, information on the prevailing runway conditions at the airport of intended landing.
b.
Transmission of SIGMET information to aircraft shall be at the initiative of the appropriate Air Traffic Services unit, by the preferred method of directed transmission followed by acknowledgment, or by a general call when the number of aircraft would render the preferred method impracticable.

c.
SIGMET information passed to aircraft shall cover a portion of the route up to 2 hours flying time ahead of the aircraft.

d.
Amended airport forecasts shall be passed to aircraft within 60 minutes from the airport of destination, unless the information would have been made available through other means.
　
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