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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 101–112
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: ______________________