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AC 91-70B

Change 1Historical
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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.
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Approved
February 1, 2019
Last reviewed
August 2, 2024
This change
Change 1 of AC 91-70B.
Cancels
AC91-70B
Cancelled by
AC91-70C
Family
AC 91-70 · 7 versions
Revision
B, change 1
14 CFR parts
91, 119, 121, 125, 135
14 CFR sections
§ 91.1001§ 91.101§ 91.103§ 91.105§ 91.107§ 91.109§ 91.11§ 91.111§ 91.113§ 91.115§ 91.117§ 91.119§ 91.121§ 91.123§ 91.125§ 91.126§ 91.127§ 91.129§ 91.13§ 91.130§ 91.131§ 91.133§ 91.135§ 91.137§ 91.138§ 91.139§ 91.141§ 91.143§ 91.15§ 91.151§ 91.153§ 91.155§ 91.157§ 91.159§ 91.167§ 91.169§ 91.17§ 91.171§ 91.173§ 91.175§ 91.177§ 91.179§ 91.180§ 91.181§ 91.183§ 91.185§ 91.187§ 91.189§ 91.19§ 91.191§ 91.193§ 91.203§ 91.205§ 91.209§ 91.21§ 91.211§ 91.213§ 91.215§ 91.217§ 91.221§ 91.225§ 91.227§ 91.303§ 91.319§ 91.323§ 91.509§ 91.511§ 91.605§ 91.609§ 91.703§ 91.705§ 91.706§ 91.707§ 91.709§ 91.711§ 91.713§ 91.715§ 91.903§ 119.59§ 119.63§ 121.11§ 121.121§ 121.163§ 121.339§ 121.351§ 121.353§ 121.355§ 125.203§ 125.209§ 125.23§ 125.363§ 125.45§ 125.51§ 135.145§ 135.165§ 135.167§ 135.183§ 135.3§ 135.43

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

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Show pages 100–111
Page 112Open in PDF

Appendix G

5. Independent verification.

6. Contingencies/fault codes.

G.6.4 Oceanic Crossing.

1. Oceanic checklist (Appendix D).

2. Master time source.

3. Clearance-Flight Information Region (FIR) differences.

4. Navigation accuracy check.

5. RVSM checks.

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

7. Position report—estimated time of arrival (ETA) tolerance.

8. Ten-minute post-position check.

G.6.5 Altimetry.

1. Barometric pressure for local altimeter setting (QNH), barometric pressure for standard altimeter setting (QNE), and atmospheric pressure at aerodrome elevation (QFE).

2. Transition Altitude (TA)/Transition Level (TL).

3. MB, Hectopascals.

G.6.6 Transponder Operations. Regional requirements.

G.6.7 Communications, navigation, and surveillance.

1. Airspace requirements (RNP 10/5/4/1).

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

3. Reduced separation—trials and implementations.

G.6.8 Strategic Lateral Offset Procedure (SLOP).

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

G.6.10 Space Weather. Warnings, alerts, and advisories (see Appendix C).

G.6.11 Operational Control.

1. OpSpec A008—Operational Control.

2. OpSpec A009—Airport Aeronautical Data.

3. OpSpec/MSpec A010—Aviation Weather Information.

G-4

Page 113Open in PDF

Appendix G G.6.12 Mach Number Technique.

1. Tolerance.

2. Areas applicable.

G.6.13 Oceanic Errors.

1. Reclearance/conditional clearances.

G-5

Page 114Open in PDF

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-AFS-140-Directives@faa.gov.

Subject: AC 91-70B CHG 1, Oceanic and Remote Continental Airspace Operations Date: _____________________ Please check all appropriate line items:

An error (procedural or typographical) has been noted in paragraph ____________ on page _______.

Recommend paragraph _____________ on page __________ be changed as follows:

______________________________________________________________________ ______________________________________________________________________ In a future change to this AC, please cover the following subject:

(Briefly describe what you want added.)

______________________________________________________________________ ______________________________________________________________________ Other comments:

______________________________________________________________________ ______________________________________________________________________ I would like to discuss the above. Please contact me.

Submitted by: Date: ______________________