AC 91-70B

Historical

Advisory circular · Oceanic and Remote Continental Airspace Operations

A newer version is currentThis is a historical version. AC 91-70D is the version in force, approved April 3, 2025.
Approved
October 4, 2016
Last reviewed
August 2, 2024
Cancels
AC91-70A
Cancelled by
AC91-70B CHG 1
Family
AC 91-70 · 6 versions
Revision
B
14 CFR parts
91, 119, 121, 125, 135

Guidance, not mandatory unless a rule or AD requires it. DRS record last changed November 21, 2025.

Show pages 6–17

2.6.5 Phase 5. If you pass the evaluation, we approve your proposal. We will grant approval by issuing an OpSpec/MSpec/LOA.

2.7 Web-Based Operations Safety System (WebOPSS).

2.7.1 WebOPSS Access. WebOPSS is the FAA’s regulatory document management system for issuing OpSpecs, MSpecs, and LOAs to air operators as indicated in 14 CFR. Authorized aviation industry personnel can apply for access to WebOPSS through their PIs.

WebOPSS access allows industry personnel to view and propose changes to their authorizations, which can expedite applications.

2.7.2 WebOPSS Training. You will require training prior to receiving WebOPSS access.

You can accomplish the training either through an FAA inspector or by taking the WebOPSS formal training course through the FAA’s Oklahoma City Training Center.

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CHAPTER 3. PILOT QUALIFICATION AND TRAINING GUIDANCE FOR

INTERNATIONAL, OCEANIC, AND REMOTE CONTINENTAL

AIRSPACE OPERATIONS

3.1 Operator/Pilot-in-Command (PIC) Responsibilities—International Operations.

3.1.1 Operator Responsibilities. In Annex 6, ICAO makes the following stipulations for flights outside the jurisdiction of Member States:

1. An operator will ensure that all employees, when abroad, know that they must comply with the laws, regulations, and procedures of those States where they conduct operations.

2. An operator will ensure that all pilots are familiar with the laws, regulations, and procedures pertinent to the performance of their duties prescribed for the areas traversed, the airports used, and the related air navigation facilities.

3. The operator will ensure that other members of the flightcrew are familiar with these laws, regulations, and procedures that are pertinent to the performance of their respective duties in the operation of the aircraft.

3.1.2 PIC Responsibilities. As a PIC conducting flight operations in international airspace, you must:

1. Comply with the relevant laws, regulations, and procedures of the United States.

2. Assume responsibility for the operation and safety of the aircraft and for the safety of all persons aboard your aircraft during flight time.

3. Notify the appropriate Air Traffic Service (ATS) unit, as soon as circumstances permit, of actions you took in an emergency which necessitated immediate action and involved a violation of local regulations or procedures. Ensure they understand that you took this action under your emergency authority as PIC. You must also submit a report on any such violation to the appropriate authority of that State, if required.

4. Notify the nearest appropriate authority, by the quickest means available, in the event of an accident or incident involving the airplane which results in the serious injury or death of any person, or results in substantial damage to the airplane or property.

3.2 Training Requirements for Oceanic and Remote Continental Airspace Operations.

3.2.1 Commercial Operator Training. Operators (other than GA operators) conducting flights in oceanic and remote continental airspace are required to have training approved by the Administrator. Your training programs will receive approval in conjunction with your company’s certification and prior to our issuance of OpSpecs or MSpecs.

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3.2.2 GA Training. If you are a GA pilot desiring to fly in oceanic and remote continental airspace, you may need operational approval via an LOA (see paragraph 2.5).

One or more of the following actions may satisfy the requirements for us to issue an LOA:

1. Completing an operator’s oceanic operations training program.

2. Completing a commercial oceanic operations training program.

3. Submitting military training records indicating prior oceanic operations experience.

4. Using other methods indicating that you can safely conduct oceanic operations. Examples could include written testing, oral testing, or evidence of prior experience.

3.2.3 Relevant Subject Matter. The following items are examples of the subject matter with which you should be familiar in order to conduct operations in oceanic and remote continental airspace:

1. Title 14 CFR (applicable parts).

2. ICAO SARPs.

3. ICAO measurement standards.

4. Use of oceanic flight planning charts.

5. Sources and content of international flight publications.

6. Itinerary planning and overflight clearances.

7. Meteorology, including significant weather (SIGWX) charts, prognostic weather charts, tropopause prognostic charts, and Terminal Aerodrome Forecasts (TAF), as well as contingency procedures for weather diversions.

8. Preparation of international flight plans, plotting charts, and operational flight plans/flight logs, to include equal time point (ETP) calculations. These include the communications, navigation, and surveillance capability codes appropriate to your aircraft and your operational authorization.

9. Specific airspace requirements, to include communications, navigation and surveillance equipment requirements, as well as operational procedures related to Reduced Vertical Separation Minimum (RVSM) and RNP.

10. Long-range, air-to-ground communication procedures, including all data link and satellite communications (SATCOM) voice operations, as applicable.

11. En route and terminal procedures—differences from U.S. procedures.

12. Use of oceanic checklists.

13. Oceanic error risk mitigations.

14. Understanding of Strategic Lateral Offset Procedures (SLOP).

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15. Air traffic clearances, to include proper terminology and phraseology.

16. Emergency and contingency procedures (see Appendix F, Special Procedures for In-Flight Contingencies in Oceanic and Remote Continental Airspace), including required emergency equipment, SAR techniques, navigation equipment failure techniques, and communication equipment failure techniques.

17. Specialized training, if conducting operations in areas of magnetic unreliability (AMU), as applicable.

18. Use of polar/remote area checklists.

19. Polar/remote area error risk mitigations.

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CHAPTER 4. COMMUNICATIONS, NAVIGATION, AND SURVEILLANCE

SYSTEMS GUIDANCE FOR OPERATIONS IN OCEANIC AND REMOTE

CONTINENTAL AIRSPACE

4.1 Communication, Navigation, and Surveillance Improvements—Impact on Air Traffic Services.

4.1.1 Technological Advances. Technological advances in ground-based computers, space-based signals, and aircraft communication, navigation, and surveillance systems all contribute to an air traffic system that provides increased navigational accuracy and allows you and your aircraft to interact more quickly with controllers. These advances have also improved controller-pilot communications, navigation accuracy, and aircraft surveillance reporting. This enhanced communications, navigation and surveillance capability greatly reduces the errors and retransmissions that hampered oceanic flights just a few years ago. These safety improvements have facilitated corresponding improvements in efficiency and capacity, where aircraft are now allowed to fly closer to each other (separation minima have been reduced). Regional airspace managers continually update equipment requirements, making it incumbent on you to fully understand the current equipment, training, and authorization requirements for any airspace in which you intend to operate.

4.1.2 Automatic Dependent Surveillance-Broadcast (ADS-B). ADS-B supports these improvements by providing a higher update and enhanced accuracy of surveillance information over the current radar-based surveillance systems. ADS-B Out capability will be required, beginning January 1, 2020, for operations throughout much of the U.S. National Airspace System (NAS). A number of other countries are also implementing widespread use of ADS-B.

4.2 Performance-Based Operations.

4.2.1 Measures of Performance. Performance-based operations relies on Required Communication Performance (RCP), Required Navigation Performance (RNP), and Required Surveillance Performance (RSP). It uses these three primary measures of performance to determine required separation between flights, both in radar contact and in oceanic and remote continental airspace. Air Traffic Services (ATS) providers determine separation requirements based on a combination of these three performance indicators.

4.2.2 RCP. RCP establishes aircraft/controller communications timeline, equipment, and flightcrew training standards. Generally, you can measure RCP in terms of the timeline required to complete the communication transaction and the continuity, availability, and integrity of the transaction. In oceanic and remote continental airspace, RCP 240 and RCP 400 are the prevalent performance standards.

4.2.2.1 RCP 240 requires a 99.9 percent probability (continuity) the communications transaction will complete in less than 240 seconds (timeline). It also requires a 99.99 percent probability the communication can be initiated (availability) 4-1

and no more than 10-5 communications transaction malfunctions per flight-hour (integrity).

4.2.2.2 RCP 400 requires a 99.9 percent probability (continuity) the communications transaction will complete in less than 400 seconds (timeline). It also requires a 99.9 percent probability the communication can be initiated (availability) and no more than 10-5 communications transaction malfunctions per flight-hour (integrity).

4.2.2.3 For additional details, please see the ICAO Global Operational Data Link Document (GOLD, current edition), Appendix B, RCP Specifications, and ICAO Document 9869, Manual on Required Communication Performance (RCP).

4.2.3 RNP. RNP establishes aircraft navigation accuracy, equipment, and flightcrew training standards. ICAO Document 9613, Performance-based Navigation Manual, outlines these standards. Generally, we measure these standards in terms of accuracy, integrity, continuity, availability, and functionality. Oceanic and remote continental airspace ATS providers primarily provide RNP 10- (also known as RNAV 10) and RNP 4-based separation minima. RNP 2 applications have also become available for oceanic and remote continental airspace, to be used by individual States as necessary to meet their airspace requirements. In all cases, ATS providers will determine separation minima between adjacent aircraft based on the authorized capability each aircraft operator files in the flight plan.

1. RNP 10 requires an aircraft to be capable of remaining within 10 nautical miles (NM) of centerline 95 percent of the time and within 20 NM

99.999 percent of the time.

2. RNP 4 requires an aircraft to be capable of remaining within 4 NM ofcenterline 95 percent of the time and within 8 NM 99.999 percent of the time.

3. RNP 2 requires an aircraft to be capable of remaining within 2 NM of centerline 95 percent of the time and within 4 NM 99.999 percent of the time.

4.2.4 RSP. RSP establishes aircraft/controller surveillance timeline and equipment standards.

Generally, you can measure RSP in terms of the timeline required to complete the transaction and the continuity, availability, and integrity of the transaction. In oceanic and remote continental airspace, RSP 180 and RSP 400 are the prevalent performance standards.

4.2.4.1 RSP 180 requires a 99 percent probability (continuity) the surveillance transaction will complete in less than 180 seconds (timeline). It also requires a 99.99 percent probability the communication can be initiated (availability) and no more than 10-5 communications transaction malfunctions per flight-hour (integrity).

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4.2.4.2 RSP 400 requires a 99 percent probability (continuity) the surveillance transaction will complete in less than 400 seconds (timeline). It also requires a 99.9 percent probability the communication can be initiated (availability) and no more than 10-5 communications transaction malfunctions per flight-hour (integrity).

4.2.4.3 For additional details, please see ICAO Document 10037, Global Operational Data Link Document (GOLD, current edition), Appendix C, RSP Specifications.

4.2.5 Access to Performance-Based Routes. The communications, navigation, and surveillance capabilities of your crew and equipment determine your eligibility for OpSpec/MSpec/LOA authorizations that enable you to take advantage of the performance-based routes in oceanic and remote continental airspace. The significant improvements in communications, navigation, and surveillance systems have allowed air traffic controllers to reduce separation between aircraft, expanding access to the routes that offer you the maximum savings in time and fuel.

Note: For a list of pertinent OpSpecs/MSpecs/LOAs, please see Appendix B, Special Areas of Operation and OpSpecs/MSpecs/LOAs.

4.3 Voice Communications in Oceanic and Remote Continental Airspace.

ICAO Annex 6 (all three parts) requires those airplanes operating under IFR to have installed and approved radio communication equipment capable of conducting two-way communications at any time during the flight. When operating over the high seas, ICAO Annex 2 requires you to equip your aircraft with a functioning two-way radio, to establish two-way radio communications with the appropriate air traffic control (ATC) unit, and to maintain a continuous listening watch on the appropriate radio frequency.

Note: It is not acceptable to depend solely on radio relay operations to satisfy this requirement. The appropriate authority for the airspace where you conduct the flight may prescribe the aeronautical stations and frequencies used for two-way communications.

4.3.1 High Frequency (HF) Radio Communications. HF radios have been in use for almost a century over oceanic and remote continental areas. As technological advances lead to more sophisticated methods of communication, HF equipment has also improved.

HF radios now offer digital tuning, compact size, Selective Calling (SELCAL) systems (see below), and new antenna concepts. Consider the following when using HF communications:

4.3.1.1 HF radio calls are normally relayed electronically, via keyboard and display, to air traffic controllers by a radio operator. There is often a delay between your requests and ATC clearance. The radio operator does not have the authority to approve your request and must coordinate with the appropriate controller for that approval.

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4.3.1.2 Communications over HF radio rely heavily on proper radio terminology and scripted reports. Use the published guidance found in en route publications or the Aeronautical Information Manual (AIM) to make sure you deliver messages in the proper format. Speak at a moderate speed using the internationally accepted phraseology. You may find ICAO standard phraseology in ICAO Document 9432, Manual of Radiotelephony. This document and other ICAO reference materials can be found on the Publications page on ICAO’s Web site, www.icao.int.

4.3.1.3 If ATC uses the terms “expect” or “when are you able,” they have not granted you a clearance. Typically, oceanic radio operators will use the phraseology “ATC clears…” when relaying a clearance.

4.3.1.4 You must read back every clearance received from ATC. Ensure that ATC acknowledges your exact read back to confirm that you correctly heard the instructions.

4.3.1.5 In general, higher frequencies (above 10.0 megahertz (MHz)) work better during daylight and lower frequencies (below 10.0 MHz) at night. It is not uncommon to use several frequencies on one flight while communicating with the same ATS provider.

4.3.1.6 HF communications are dependent on transmitted signals striking the ionosphere and reflecting back to antennae at ground stations. The ionosphere is susceptible to interference from space weather, resulting in periods where HF reception is marginal or unreadable. You may especially notice this phenomenon in polar regions above 60° north or below 60° south and during periods of significant solar activity.

4.3.2 SELCAL. SELCAL is a means to alert an individual aircraft that a ground station wishes to communicate with it. ATS providers can transmit SELCAL signals over very high frequencies (VHF) or HF. The signals produce an audio tone and possibly a cockpit light or message that alerts you to initiate contact with the appropriate ATC unit.

4.3.2.1 The SELCAL codes are controlled by a commercial service and are assigned to a specific aircraft. Since the number of unique SELCAL codes is less than the number of aircraft with SELCAL capability, multiple aircraft could be operating and logged in with the same SELCAL code assignment.

4.3.2.2 When you apply for SELCAL codes for your aircraft, the issuing company will deconflict duplicate codes by region as much as possible. However, aircraft flying in multiple regions may encounter another aircraft using the same code. You must ensure that the SELCAL contact you respond to is intended for your aircraft.

4.3.2.3 Efforts are underway to increase the number of codes by expanding the number of audible tones that make up the system. The newest SELCAL equipment will use alphanumeric instead of the alpha-only codes, increasing 4-4

the number of unique identifiers from the current 10,920 to 215,760.

Implementation of the new system is expected to begin in the 2017 timeframe.

Operators with HF SELCAL systems not compatible with the new alphanumeric codes may continue to encounter other aircraft with duplicate codes.

4.3.2.4 Check HF SELCAL even when your Controller-Pilot Data Link Communication (CPDLC) is working properly. You should do a SELCAL check prior to oceanic entry and then again at each control area boundary.

4.3.3 SATVOICE. In keeping with ICAO’s recognition of SATVOICE as a valid Long-Range Communication System (LRCS), the FAA accommodates SATVOICE through arrangements with the recognized Aeronautical Mobile Satellite (Route) Service (AMS(R)S) providers. Direct SATVOICE contact between the pilot and ATC is currently limited to distress and urgency situations, or other exceptional circumstances only.

For oceanic communications service provider relay to ATC, SATVOICE short codes are published in the U.S. Aeronautical Information Publication (AIP). As this technology evolves, ensure that you comply with the latest authorizations. For additional guidance, refer to ICAO Document 10038, the Satellite Voice Operations Manual (SVOM).

4.3.4 Radio Frequency Changes. Radio frequencies are constantly changing. Thus, it is important that you consult the appropriate AIP, current oceanic charts, and commercial en route publications for the most current information.

• The North Atlantic Operations and Airspace Manual (ICAO NAT Document 007) describes North Atlantic (NAT) operations, to include communication and navigation procedures in NAT airspace.

• Commercially published navigation charts contain details of communication procedures on inserted panels. Exercise some caution in using this reference, as they may be on a different update cycle than the source documents and therefore could be not completely up to date.

4.4 CPDLC and Automatic Dependent Surveillance-Contract (ADS-C). Since the mid-1990s, data link communications systems have enhanced contact between ATS providers and the flight deck. These communication systems are now widely used throughout the world and have also led to the implementation of Automatic Dependent Surveillance (ADS) systems that further improve ATS capability. CPDLC technology improves communications between aircraft and ATS providers. CPDLC eliminates the often challenging HF voice communications that were the only communication link with oceanic and remote continental airspace air traffic controllers for decades. With CPDLC, you and the controller transfer ATC clearance requests and instructions digitally, reducing the likelihood of miscommunication. ADS-C is also widely used in oceanic and remote continental airspace and, in combination with CPDLC, has become required equipment to be assigned the most efficient routes across the NAT organized track system (OTS), where ATC allows minimum separation between aircraft.

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Note 1: In ADS-C, C = “Contract.” The controller sets up one or more electronic contracts with your aircraft to automatically provide time-triggered (periodic) and/or condition-triggered (e.g., deviation event) reports.

Note 2: Equipage with CPDLC does not eliminate the requirement for operable two-way radios. For most oceanic operations this means operable HF radios are required.

4.4.1 Access to Preferred Airspace. Since equipment like CPDLC and ADS-C improves the efficiency with which aircraft in oceanic and remote continental airspace can be controlled, such better-equipped aircraft are being better served through initiatives to reserve preferred blocks of oceanic airspace for those aircraft. Preferred altitudes and routes around the world are more readily issued to aircraft equipped with robust communications, navigation and surveillance capabilities.

4.4.2 Flight Management Computer Waypoint Reporting (FMC WPR) Service. FMC WPR service is one of the original data link capabilities, whereby your flight management computer (FMC) sends a waypoint report to the ATS provider via Aircraft Communications Addressing and Reporting System (ACARS) or CPDLC. It is gradually being replaced by automatic position reporting via ADS-C systems.

4.5 Data Link Systems—Operational Authorization to Use. We will grant operational authorization for operators to use data link by issuing OpSpec/MSpec/LOA A056, Data Link Communications, as appropriate.

Note: OpSpec/MSpec/LOA A056 also applies to datalink communications in overland areas, such as Aeronautical Telecommunication Network Baseline 1 (ATN B1) (formerly Link 2000+), used in European airspace.

4.5.1 Procedures for Obtaining Authorization. You are required to obtain operational authorization prior to using data link systems on designated oceanic and remote continental airspace routes. You can find our guidance on the process and procedures for operational authorization and aircraft data link system approval in the current editions of the following documents:

• AC 20-140, Guidelines for Design Approval of Aircraft Data Link Communication Systems Supporting Air Traffic Services (ATS).

• AC 120-70, Operational Authorization Process for Use of Data Link Communication System. Operators should consult geographic-specific areas of this document.

4.5.2 Data Link Requirements and Standards. You can consult ICAO Document 10037, GOLD, for additional information on data link requirements and standards.

4.6 ATC in Oceanic and Remote Continental Airspace.

4.6.1 Procedural Airspace. Oceanic and remote continental airspace is nonradar (i.e., where the separation of aircraft does not depend on ground-based radar coverage) and where there 4-6

is no other form of surveillance such as ADS-B. It is considered “procedural airspace.”

ATS providers in oceanic and remote continental airspace primarily provide procedural control and procedural separation to all flights.

4.6.1.1 These facilities issue clearances and instructions providing separation vertically and horizontally, based on the specific aircraft equipment authorizations you indicate on your flight plan. Because of ATC’s lower confidence in the aircraft’s reported position, adjacent aircraft under procedural control are kept farther apart from each other than under radar control.

4.6.1.2 ATC monitors your compliance with the issued clearance. Your aircraft position reports are processed for conformance with the clearance. If your aircraft is equipped with ADS-C, it provides trigger alerting for lateral and vertical deviations.

4.6.1.3 In order to make this nonradar airspace traffic management system work the way it is designed, you must provide timely and accurate time estimates (estimated time of arrival (ETA)) and operate with strict discipline and adherence to ATC clearances and procedures, both normal and contingency.

4.6.1.4 Controllers manage longitudinal separation in procedural airspace by assigning speeds, either true Mach number or true airspeed. An airspeed assignment is one element of an oceanic clearance. Proper separation of aircraft is dependent upon pilots maintaining the speed assigned with the oceanic clearance (not to be confused with the flight plan speed); therefore, compliance with the speed assignment is mandatory.

4.6.2 ICAO Procedures for Specific Geographical Areas. You will find detailed ICAO procedures for specific geographical areas in ICAO Document 7030, Regional Supplementary Procedures. FAA ATC bases its procedures for oceanic and remote continental airspace on ICAO Standards and Recommended Practices (SARP).

4.6.3 U.S. ATS in Oceanic and Remote Continental Airspace. The United States provides ATS in oceanic and remote continental airspace as follows:

• Atlantic Ocean: New York, Miami, and San Juan Flight Information Regions (FIR).

• Gulf of Mexico: Miami and Houston FIRs.

• Pacific Ocean: Oakland and Anchorage FIRs.

• Arctic Ocean: Anchorage Arctic FIR.

• Alaska Remote Continental Airspace: Anchorage Air Route Traffic Control Center (ARTCC).

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