AC 91-70C

Historical

Advisory circular · Oceanic and Remote Continental Airspace Operations

A newer version is currentThis is a historical version. AC 91-70D CHG 1 is the version in force, approved October 19, 2026.
Approved
October 4, 2023
Last reviewed
August 2, 2024
Family
AC 91-70 · 7 versions
Revision
C
14 CFR parts
91, 119, 121, 125, 135

Guidance, not mandatory unless a rule or AD requires it. DRS record last changed November 22, 2025.

Show pages 111–122
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Appendix F F-9 F.4.3 Additional Considerations:

1. Flights involved in level change should complete the maneuver as soon as possible in accordance with the clearance.

2. Mandatory position reports should be accomplished via high frequency (HF) or Satellite Voice (SATVOICE) until directed by ATC.

3. Flights equipped with Future Air Navigation System 1/A (FANS 1/A) or equivalent should communicate using HF voice or SATVOICE while attempting to reestablish CPDLC connection in airspace where ATC services are suspended.

4. Flights may request their flight dispatch offices provide traffic information and/or forward position reports to the relevant OCA.

F.4.4 Additional Recommendations. Consistent with AIP recommendations, should flightcrews encounter situations that are not covered by regulation, they are expected to exercise good judgment in whatever action they elect to take. Additionally, flightcrews should take the following actions:

1. Monitor for traffic visually and by using Traffic Alert and Collision Avoidance System (TCAS) or Automatic Dependent Surveillance-Broadcast (ADS-B) In.

2. Ensure all appropriate exterior lights are operable and turned on.

3. Monitor and use, as appropriate, relevant communication channels (e.g., 121.5/123.45 or 126.9 MHz in oceanic airspace) to include HF frequencies for traffic and situational awareness, and SATVOICE and/or data link.

F.4.5 References:

• IATA’s In-Flight Broadcast Procedures (IFBP) (see Appendix E of this AC).

• TIBA (refer to ICAO Annex 11, Attachment B).

• Two-way radio communications failure (refer to § 91.185 and AIP, GEN 3.4, paragraphs 12 and 13).

• North Atlantic (NAT) communications failure (refer to AIP, ENR 7.8, paragraph 4 and ICAO NAT Doc 006, Air Traffic Management Operational Contingency Plan, North Atlantic Region).

• Pacific communications failure (refer to ICAO Annex 2, paragraph 3.6.5.2.2, and ICAO Doc 7030, Regional Supplementary Procedures, PAC paragraph 9.3).

• Special Procedures for In-Flight Contingencies in Oceanic Airspace (refer to the U.S.

AIP, ENR 7.3).

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Appendix G G-1 APPENDIX G. SUGGESTED SUBJECTS FOR INCLUSION IN OCEANIC AND

INTERNATIONAL PROCEDURES AND/OR AN OPERATIONS MANUAL Note 1: This list is for reference only. It is not intended to be all-inclusive. You are encouraged to use this list when creating procedures and/or operations manuals and keeping them current. The complexity of your operations and operational approvals will dictate which items on this list are applicable or need to be expanded. Please see the North Atlantic (NAT) Resource Guide for United States Operators; Pacific Resource Guide for U.S. Operators; or West A tlantic , Gulf of Mexico, and Caribbean Resource Guide for U.S. Operators for the most current version of this list.

Note 2: You should establish and maintain a robust process to remain current in oc eanic and international operations. This continuous analysis or process is one component of an operator’s SMS.

G.1 Regulations, ICAO Guidance, and References.

G.1.1 Title 14 CFR.

G.1.2 Applicable ICAO Documents (current editions). Find the following documents at the ICAO store at https://store.icao.int:

• ICAO Doc 4444, Procedures for Air Navigation Services—Air Traffic Management.

• ICAO Doc 7030, Regional Supplementary Procedures.

• ICAO Doc 9574, Manual on a 300 m (1000 ft) Vertical Separation Minimum Between FL 290 and FL 410 Inclusive.

• ICAO Doc 9613, Performance-based Navigation (PBN) Manual.

• ICAO Doc 10037, Global Operational Data Link (GOLD) Manual (CPDLC, ADS-C).

• ICAO Annex 2, Rules of the Air.

• ICAO Annex 6, Operation of Aircraft (Parts I, II, and III, as applicable).

• ICAO NAT Doc 007, North Atlantic Operations and Airspace Manual.

G.1.3 Aeronautical Information Publication (AIP), United States of America—Rel evant Material.

G.1.4 Applicable FAA ACs (current editions):

• AC 90-105, Approval Guidance for RNP Operations and Barometric Vertical Navigation in the U.S. National Airspace System and in Oceanic and Remote Continental Airspace.1

1 See, in particular, AC 90-105, Chapter 8, Paragraph 8.4.3, Pilot Knowledge.

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Appendix G G-2

• AC 90-117, Data Link Communications.

• AC 91-70, Oceanic and Remote Continental Airspace Operations.

• AC 91-85, Authorization of Aircraft and Operators for Flight in Reduced Vertical Separation Minimum (RVSM) Airspace.

• AC 120-42, Extended Operations (ETOPS and Polar Operations) (also refer to 14 CFR part 121, § 121.161).

• AC 135-42, Extended Operations (ETOPS) and Operations in the North Polar Area (also refer to 14 CFR part 135, § 135.364).

G.1.5 Miscellaneous:

• FAA North Atlantic (NAT) Resource Guide for United States Operators; Pacific Resource Guide for U.S. Operators; or West Atlantic, Gulf of Mexico, and Caribbean Resource Guide for U.S. Operators, Required Navigation Performance (RNP) PDF, ICAO Paris, and Eurocontrol (SKYbrary).

• State Department Travel Alerts and Transportation Safety Administration (TSA) Alerts.

• Electronic Flight Bag (EFB) instructions and procedures; applications (as applicable).

G.1.6 NOTAMs, GPS NOTAMs, FAA International Notices, and Special Federal Aviation Regulations (SFAR).

G.2 Navigation. Continental (formerly Class I) versus Oceanic and Remote navigation; and navigation by means of DR.

G.3 Flight Planning.

G.3.1 North American Routes (NAR).

G.3.2 Track Messages.

G.3.3 ATC Flight Plans. Explanation and correct codes.

G.3.4 Operational Flight Plan (OFP) (also known as Computer Flight Plan (CFP)):

• Comparison to ATC flight plan.

• Basic cross checks (fuel, groundspeed, winds).

• ETP and points of safe return.

• Fuel requirements (in particular, ICAO Annex 6) and reduced fuel (OpSpecs B043, B044, and B343).

G.3.5 SAO Requirements.

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Appendix G G-3 G.3.6 Use of Plotting/Orientation Chart and Master Document.

G.3.7 Weather Radar (WX) Charts:

• TAF, Aviation Routine Weather Report (METAR), and SIGWX.

• 700 millibars (mb), 500 mb, 400 mb, 300 mb, 250 mb.

• Approved source(s): NWS and EWINS.

G.3.8 D riftdown —Terrain, Alternates, ETOPS.

G.3.9 WGS 84 or Approved Equivalent Compliance.

G.4 State Operating Restrictions.

G.5 Reduced Vertical Separation Minimum (RVSM):

• General description.

• Metric assignments (e.g., China).

• Minimum required equipment.

• Contingencies.

• Forecasts, tropopause, temperature deviations.

G.6 Accident/Incident.

G.6.1 T itle 49 of the Code of Federal Regulations (49 CFR):

• Part 175, Carriage by Aircraft ( Hazardous Materials Regulations).

• Part 830, Notification and Reporting of Aircraft Accidents or Incidents and Overdue Aircraft, and Preservation of Aircraft Wreckage, Mail, Cargo, and Records (National Transportation Safety Board).

G.6.2 Contingencies:

• Weather deviations.

• General contingencies.

• Lost communications, TIBA, IFBP.

• Degraded navigation, DR.

• Activation of AMVER system, emergency locator transmitter (ELT).

• Depressurization/Oxygen supply.

• Intercept, hijack.

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Appendix G G-4 G.6.3 Use of Navigation System:

• Review of Airplane Flight Manual Supplements (AFMS) for capabilities/limitations.

• Description of GPS, GPS NOTAMs, RAIM prediction, FDE.

• Description of INS, time limits.

• Currency/software version of database.

• Loading and cross-checks.

• Independent verification.

• Contingencies/fault codes.

G.6.4 Oceanic Crossing:

• Oceanic checklist (Appendix D).

• Master time source.

• Clearance-FIR differences.

• Navigation accuracy check.

• RVSM checks.

• Approaching, overhead, and post-position waypoint checks.

• Position report—ETA tolerance.

• Ten-minute post-position check.

G.6.5 Altimetry:

• QNH, QNE, and QFE.

• Transition altitude (TA)/transition level (TL).

• MB, hPa.

G.6.6 Transponder Operations. Regional (e.g., NAT, Pacific) requirements.

G.6.7 Communications, Navigation, and Surveillance.

1. Airspace requirements (RNP 10/4/2).

2. Data link (ADS-C, CPDLC).

3. Voice communications and aeronautical radio stations (VHF, HF, SATVOICE).

4. Reduced separation—trials and implementations.

G.6.8 Strategic Lateral Offset Procedures (SLOP).

G.6.9 Volcanic Ash. Source of information and crew notification.

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Appendix G G-5 G .6.10 Space Weather. Warnings, alerts, and advisories (see Appendix C, Unusual Weather Activity).

G .6.11 Operational Control:

• OpSpec A008—Operational Control.

• OpSpec A009—Airport Aeronautical Data.

• OpSpec/MSpec A010—Aviation Weather Information.

G.6.12 O ceanic Speed Control:

• Tolerance, areas applicable.

• ATC Mach Number Technique.

• Operations Without Assigned Fixed Speed (OWAFS).

G.6.13 O ceanic Errors:

• Revised clearance/conditional clearances.

• CPDLC route clearances.

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Advisory Circular Feedback Form If you find an error in this AC, have recommendations for improving it, or have suggestions for new items/subjects to be added, you may let us know by contacting the Flight Technologies and Procedures Division (AFS-400) at 9-AWA-AFS400-Coord@faa.gov or the Flight Standards Directives Management Officer at 9-AWA-AFB-120-Directives@faa.gov.

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