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 116–127
Page 128Open in PDF

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.

Page 129Open 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-AFB-120-Directives@faa.gov.

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

An e rro r (pro cedural 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: ______________________