What are enroute low altitude charts used for?

IFR Enroute Low Altitude Charts provide aeronautical information for navigation under instrument flight rules below 18,000 feet MSL . These four-color chart series includes: Air Traffic Services. Airports that have an Instrument Approach Procedure or a minimum 3000′ hard surface runway.

Which types of airspace are depicted on the enroute low altitude chart?

5-1 Which types of airspaces are depicted on the En Route Low Altitude Chart? LImits of controlled airspace, military training routes and special use airspace.

What does minimum enroute altitude guarantee?

Minimum En Route Altitude (MEA). The MEA is the lowest published altitude between radio fixes that assures acceptable navigational signal coverage and meets obstacle clearance requirements between those fixes.

What is low altitude route?

The low altitude route structure is for use from 1,200 feet above the surface (or in some instances higher) up to but not including 18,000 feet MSL. Route designators and significant points defining the routes are listed in FAA Order JO 7400.11, Airspace Designations and Reporting Points.

What is the difference between MEA and MOCA?

Both the MEA and MOCA provide the same obstruction clearance. The only differ- ence is that radio navigation signal coverage is provided along the entire airway segment at the MEA, but the MOCA provides radio navigation signal coverage only within 22 nautical miles of the VOR.

What is Lo chart?

The LO chart series, comprising 10 charts, depicts aeronautical radio information, airways system, controlled/uncontrolled airspace structure, special use airspace, communication stations and selected aerodromes. It is used for IFR route planning and inflight navigation.

What does MDA mean in aviation?

minimum descent altitude
The Aeronautical Information Manual) (AIM) defines minimum descent altitude, or MDA, as “the lowest altitude, expressed in feet above mean sea level (MSL), to which descent is authorized on final approach, or during circle-to-land maneuvering, in execution of a standard instrument approach procedure (SIAP) where no …

What is MCA in IFR?

The Minimum Crossing Altitude (MCA) is the lowest altitude at which a navigational fix may be crossed when entering or continuing along an airway that will allow an aircraft to clear all obstacles while carrying out a normal climb to the required minimum en route IFR altitude (MEA) of the airway in question beyond the …

What does a mea guarantee?

Put simply, the MEA is the lowest altitude to be flown in an airspace structure which assures: reception of navigation aids necessary to navigate accurately along the required route, two-way communication with air traffic control, safe clearance from obstacles within the sector, and.

Can you fly below the MEA?

IFR GPS aircraft can be cleared below the MEA down to the MOCA if there is one. Absent a MOCA, ATC can assign altitudes at or above the MVA or MIA along the route of flight and must issue lost communication instructions.

Can you fly at MOCA?

For aircraft using VOR, VORTAC or TACAN for navigation, this [i.e., flying at the MOCA] applies only within 22 miles of that NAVAID. The low-altitude en route chart below points out examples of MEAs and MOCAs. (Click here to see the chart at SkyVector.com.)

What does low IFR mean?

IFR means a ceiling less than 1,000 feet AGL and/or visibility less than three miles. Low IFR (LIFR) is a sub-category of IFR. VFR means a ceiling greater than 3,000 feet AGL and visibility greater than five miles. Marginal VFR (MVFR) is a sub- category of VFR.

What does a brown airport symbol indicate on the low enroute chart?

Instrument approaches can be found at airports with blue or green symbols, while the brown airport symbol denotes airports that do not have instrument approaches.

What are the altitudes a low and high IFR altitude chart service?

Low Altitude En Route Charts are used for IFR navigation at altitudes below 18,000 feet. The VOR and L/MF (nondirectional radio beacons) Airway System consists of airways designated from 1,200 feet above the surface (or in some instances higher) up to but not including 18,000 feet MSL.

What is the difference between DH and MDA?

MDA is referenced to mean sea level and MDH is referenced to the aerodrome elevation or to the threshold elevation if that is more than 2 m (7 ft) below the aerodrome elevation. An MDH for a circling approach is referenced to the aerodrome elevation.

Is ILS a DA or MDA?

Looking at the KAPA ILS or LOC RWY 35R below, the ILS approach has a DA of 6,085 feet MSL. That means you can descend on the glide path down to 6,085′, make your decision while you remain on the glide path, and then either continue your descent to land, or start climbing and execute your missed approach.

When should I climb MCA?

You must be at or above the MCA by the time you reach the intersection so a climb should be established prior to reaching the intersection.