AIM Text
Pilots operating under reduced lateral separation must be particularly familiar with, and prepared to rapidly implement, the standard contingency procedures specifically written for operations when outside ATC surveillance and direct VHF communications (for example, the oceanic environment). Specific procedures have been developed for weather deviations. Operators should ensure all flight crews operating in this type of environment have been provided the standard contingency procedures in a readily accessible format. The margin for error when operating at reduced separation mandates correct and expeditious application of the standard contingency procedures. These internationally accepted procedures are published in ICAO Document 4444, chapter 15. The procedures are also reprinted in the U.S. Aeronautical Information Publication (AIP), En Route (ENR) Section 7.3, Special Procedures for In-flight Contingencies in Oceanic Airspace; and AC 91-70.
Source: FAA Aeronautical Information Manual · current edition · paragraph 4-7-6.
The short answer
This AIM section is FAA advisory guidance directing pilots flying at reduced lateral separation, such as in the oceanic environment outside ATC surveillance and direct VHF communications, to know and rapidly apply the standard in-flight contingency procedures, including those for weather deviations, published in ICAO Document 4444, chapter 15.
Research Notes
Common Questions
Where are the standard oceanic contingency procedures published?
The AIM notes these internationally accepted procedures appear in ICAO Document 4444, chapter 15, and are reprinted in the U.S. AIP, En Route (ENR) Section 7.3, Special Procedures for In-flight Contingencies in Oceanic Airspace, and in AC 91-70.
Why must contingency procedures be applied so precisely at reduced separation?
Per this guidance, the margin for error when operating at reduced separation mandates correct and expeditious application of the standard contingency procedures, since operations occur outside ATC surveillance and direct VHF communications.
Are there specific procedures for weather deviations?
Yes. The AIM states specific procedures have been developed for weather deviations, and operators should ensure all flight crews in this environment have the standard contingency procedures in a readily accessible format.