Contents
How often do the tracks over the Atlantic Ocean change?
While the routes change daily, they maintain a series of entrance and exit waypoints which link into the airspace system of North America and Europe. Each route is uniquely identified by a letter of the alphabet. Westbound tracks (valid from 11:30 UTC to 19:00 UTC at 30W) are indicated by the letters A,B,C,D etc.
Is NAT HLA RNP4?
2016. Changed February 2016. NAT HLA = NAT High Level Airspace. Now includes Bodo Oceanic, and aircraft must be RNP 4 or RNP10.
What is TMI in NAT?
Each NAT Track Message is identified by means of a 3-digit Track Message Identification (TMI) number based on the Julian calendar date for which that OTS is effective. The REMARKS section is an important element of the NAT Track Message.
What is the ICAO Doc 4444 contingency maneuver?
ICAO Doc 4444, ¶15.2. 1.2] The pilot shall take action as necessary to ensure the safety of the aircraft, and the pilot’s judgment shall determine the sequence of actions to be taken, having regard to the prevailing circumstances. Air traffic control shall render all possible assistance.
What is a LRNS?
Long-range navigation system (LRNS). An electronic navigation unit that is approved for use under instrument flight rules as a primary means of navigation, and has at least one source of navigational input, such as inertial navigation system or global positioning system.
What is NAT HLA in aviation?
High Level Airspace (HLA) A large portion of the airspace of the North Atlantic Region, between FLs 285 and 420 inclusive, is designated as the NAT High Level Airspace (NAT HLA). Until February 2016, most of this airspace was designated Minimum Navigation Performance Standards (MNPS) airspace.
Are there any tracks in the North Atlantic?
The following are active North Atlantic Tracks issued by Shanwick Center (EGGX) and Gander Center (CZQX). Any NOTAMs pertaining to these tracks (waypoint changes, procedures) will be found by searching the ARTCC NOTAMs under Shanwick Center (EGGX), Gander Center (CZQX), Boston Center (KZBW) and New York Center (KZNY).
How are the tracks on the Nats changed?
The tracks use a set of fixed entry and exist points at their extremities: Those points change over time when the NAT airspace is reorganized, e.g. with the adoption of HLA in replacement of MNPS. The process is collaborative between airlines and ATC.
How are the tracks from North America to Europe named?
Tracks to North America are named starting at letter A, tracks to Europe are named starting at letter Z. Routes for Europe are in the middle of the polar jet, routes to North America are the northernmost, where the jet is the weakest.
When does the NAT Track OTS come out?
The agreed OTS is promulgated by means of the NAT Track Message via the AFTN to all interested addressees. A typical time of publication of the day-time OTS is 2200 UTC and of the night-time OTS is 1400 UTC. FAA, other agencies and aviation blogs relay the NAT-OTS notam on the web.