JO 7110.65 2-7-3

When the barometric pressure is greater than 31.00 inches mercury (31” Hg), issue the altimeter setting and phraseology that high barometric pressure procedures are in effect:

En Route/Arrivals. Advise pilots to leave altimeter set to 31.00 until reaching final approach fix. PHRASEOLOGY-

ALTIMETER (setting) HIGH BAROMETRIC PRESSURE RESTRICTIONS IN EFFECT, SET THREE ONE ZERO ZERO UNTIL REACHING THE FINAL APPROACH FIX.

Departures. Advise pilots to set altimeter to 31.00 prior to reaching any mandatory/crossing altitude or 1,500 feet AGL, whichever is lower. PHRASEOLOGY-

ALTIMETER (setting) HIGH BAROMETRIC PRESSURE RESTRICTIONS IN EFFECT, SET THREE ONE ZERO ZERO PRIOR TO REACHING (mandatory/crossing altitude or 1,500 feet AGL, whichever is lower).

Affected Air Route Traffic Control Centers (ARTCC) must request, via the U.S. NOTAM Office (USNOF), that a high barometric pressure NOTAM be issued for flying in regions where barometric pressure is above or forecast to be above 31” Hg. NOTE-

Altitude reporting transponders transmit the pressure altitude (Flight Level) of the aircraft. The altimeter setting does not directly affect the transponder reported altitude. ATC automation applies the current altimeter setting to the pressure altitude received and displays the altitude of the aircraft above mean sea level (MSL).

With a barometric pressure of 31.30” Hg and the aircraft's altimeter set at 31.00” Hg, the Mode C transponder will transmit the actual altitude of 3,300, feet while the altimeter only shows 3,000 feet. This will occur unless local directives authorize entering the altimeter setting 31.00” Hg into the ATC automation regardless of the actual barometric pressure.

Airports unable to accurately measure barometric pressures above 31.00” Hg. will report the barometric pressure as “missing” or “in excess of 31.00” Hg.” Flight operations to or from those airports are restricted to VFR weather conditions.

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Chapter 2. General Control 7110.65BB

7110.65 by Chapter Number Chapter 0. General Information Chapter 1. General Chapter 2. General Control Chapter 3. Airport Traffic Control - Terminal Chapter 4. IFR Chapter 5. Radar Chapter 6. Nonradar Chapter 7. Visual Chapter 8. Offshore/Oceanic Procedures Chapter 9. Special Flights Chapter 10. Emergencies Chapter 11. Traffic Management Procedures Chapter 12. Canadian Airspace Procedures Chapter 13. Decision Support Tools Chapter 14. Data Link Communications Appendix A Appendix B

ATPUBS

JO 7110.65BB by Topic

General Information Explanation of Changes

General Introduction

Terms of Reference

General Control General

Flight Plans and Control Information

Flight Progress Strips

Radio and Interphone Communications

Route and NAVAID Description

Weather Information

Altimeter Settings

Runway Visibility Reporting- Terminal

Automatic Terminal Information Service Procedures

Team Position Responsibilities

Airport Traffic Control - Terminal General

Visual Signals

Airport Conditions

Airport Lighting

Runway Selection

Airport Surface Detection Procedures

Taxi and Ground Movement Procedures

Spacing and Sequencing

Departure Procedures and Separation

Arrival Procedures and Separation

Helicopter Operations

Sea Lane Operations

IFR NAVAID Use Limitations

Clearances

Departure Procedures

Route Assignment

Altitude Assignment and Verification

Holding Aircraft

Arrival Procedures

Approach Clearance Procedures

Radar General

Beacon/ADS-B Systems

Radar Identification

Transfer of Radar Identification

Radar Separation

Vectoring

Speed Adjustment

Radar Departures

Radar Arrivals

Radar Approaches- Terminal

Surveillance Approaches- Terminal

PAR Approaches- Terminal

Automation- En Route

Standard Terminal Automation Replacement System (STARS)-Terminal

Nonradar General

Initial Separation of Successive Departing Aircraft

Initial Separation of Departing and Arriving Aircraft

Longitudinal Separation

Lateral Separation

Vertical Separation

Timed Approaches

Visual General

Visual Separation

VFR‐On‐Top

Approaches

Special VFR (SVFR)

Basic Radar Service to VFR Aircraft- Terminal

Terminal Radar Service Area (TRSA)-Terminal

Class C Service- Terminal

Class B Service Area- Terminal

Offshore/Oceanic Procedures General

Coordination

Longitudinal Separation

Lateral Separation

Offshore/Oceanic Transition Procedures

Separation from Airspace Reservations

North Atlantic ICAO Region

Caribbean ICAO Region

Pacific ICAO Region

North American ICAO Region

Special Flights General

Special Operations

Special Use, ATC-Assigned Airspace, and Stationary ALTRVs

Fuel Dumping

Jettisoning of External Stores

Unmanned Free Balloons

Parachute Operations

Unidentified Anomalous Phenomena (UAP) Reports

Emergencies General

Emergency Assistance

Overdue Aircraft

Control Actions

Miscellaneous Operations

Oceanic Emergency Procedures

Ground Missile Emergencies

Traffic Management Procedures General

Canadian Airspace Procedures General Control

Decision Support Tools ERAM - En Route

ATOP - Oceanic

Data Link Communications Terminal Procedures for Issuing Automated Clearances

En Route Controller Pilot Data Link Communications (CPDLC) - Domestic

Advanced Technologies and Oceanic Procedures (ATOP) - Oceanic Controller Pilot Data Link Communications (CPDLC)

Appendix A

Appendix B

General Control

Runway Visibility Reporting- Terminal

Chapter 2. General Control

Section 8. Runway Visibility Reporting- Terminal