IFR Enroute Charts Flashcards
These are T Routes or T-Airways, pronounced “Tango Routes” or “Tango Airways.”
The T-route structure is designed to reduce pilot and air traffic controller workload around busy areas (typically class B). The establishment
of the T-routes eliminates the need for the terminal and center controllers to coordinate and allows pilots to file an IFR flight plan using the
routes, both reducing workload and increasing situational awareness.
This indicates an FSS remote communications outlet (RCO). The name and frequency of the FSS are shown.
The RCO can be associated with an airport or a NAVAID or it can be standalone. If it is standalone, this symbol will be used to show its location:
This is a one way route with the effected hours shown.
These will be the NAVAID’s identification letters - in this case PBF.
The NAVAID’s frequency in this case (1 16.0) is crosshatched. This indicates that the facility is shut down or inoperative. As a practical matter,
therefore, we can expect no coded identification from the NAVAID if we attempt to listen to it. However, this question just asks what the
letters are - not whether you should be able to hear them!
BLUE - Airports with an approved Department of Defense (DOD) Low or High Altitude Instrument Approach Procedure and/or DOD
RADAR MINIMA published in DOD FLIPS (Flight Information Publications), the FAA Terminal Procedures Publication (TPP), the Supplement
Alaska or the Terminal Alaska volume.
Memory aid - think Blue as in “Air Force Blue.” A blue symbol basically means that the airport has an IAP approved for military users.
The “T” in effect indicates a “Terminal” class NAVAID. Below 12000’ ACLI this means a usable range of 25nm.
The Off Route Obstruction Clearance Altitude (OROCA) is represented in thousands and hundreds of feet above mean sea level. The
OROCA represents the highest possible elevation including both terrain and other vertical obstructions (towers, trees., etc.) bounded by the
ticked lines of latitude and longitude. In this example the OROCA represents 12,500 feet.
OROCA is computed just as the Maximum Elevation Figure (MEF) found on Visual charts except that it provides an additional vertical buffer
of 1,000 feet in designated non-mountainous areas and a 2,000 foot vertical buffer in designated mountainous areas within the United
States.
Military Training Routes (MTRs) are routes established for the conduct of low-altitude, high-speed military flight training (generally below
10,000 feet MSL at airspeeds in excess of 250 knots IAS).
VR routes are VFR Military Training Routes. IR routes are IFR Military Training Routes.
What’s the difference between military routes with 3 digits vs. 4 digits?
Example: IR204 ; IR1605
3 Digits = Above 1500’ AGL
4 Digits = Below 1500’ AGL
The one of the left is a regular NDB. The one on the right is a compass locator, in effect a low-power (therefore lower range) NDB.
This is a VOR/DME. Yes, DME services are provided.
he answer depends on whether you mean the “traditional” classification of VORs into High/Low/Terminal or the new classification built
pon the needs of the VOR MON. The good news is that for most FAA practical tests we don’t think you need to have these memorized any
ore, but you should have a rough idea of the volumes and an idea where to look them up in the AIM.
- Traditional L-Class VOR: 40 nm
- New Classification: VOR-LOW
0 1000-5000 feetAGL: 40 nm
0 5000-18000 feet AOL: 70 nm
This is the DME channel associated with this NAVAID. This is not of importance to most civilian pilots as you will not usually need to enter this
separately into your DME equipment.
What are the minimum and maximum altitudes for Victor airways?
The FAA has established two fixed route systems for air navigation. The VOR and LF/MF (low or medium frequency) system - (“Victor Airways”)
designated from 1,200’ AGL to but not including 18,000’ MSL —is shown on Low Altitude Enroute Charts, and the Jet Route system
designated from 1 8,000’ MSL to FL 450 inclusive—is shown on High Altitude Enroute Charts.
5500 is the Minimum Enroute Altitude (MEA) in the segment shown.
5500
MOCA, the 3500* in the segment shown, does not satisfy the requirement as it only provides navigational
signal coverage within 22nm of each fix. This would leave 16nm in our hypothetical route that does not
meet the requirement.
What does the “12” of a victor airway such as “V I2” actually mean?
Typically, Victor airways are given odd numbers when oriented north/south and even numbers when
oriented east/west. If more than one airway coincides on a route segment, the numbers are listed serially
(e.g., “V287-495- 500”)
All except for “VOR”
What airports are shown on IFR Enroute Charts?
All active airports with hard-surfaced runways of 3000’ or longer are shown on FAA IFR Enroute Charts.
All active airports with approved instrument approach procedures are also shown regardless of runway
length or composition.
Runway length is the length of the longest active runway (including displaced thresholds but excluding
overruns) and is shown to the nearest 100 feet using 70 feet as the division point; e.g., a runway of 8,070’ is
labeled 81.
In this case, the minimum possible length would be 4270 feet.
Note that the “s” means that it is a soft surfaced runway.
mileage between waypoints / NAVAIDs / other reporting points and/or a mileage
This represents a
300 nm
breakdown.
These are joint military and civilian airports.
An “L in a circle with star” symbol means the lighting is less than continuous. The pilot should consult
the Airport / Facility Directory sections of the Chart Supplements publications for light operating
procedures. The Airman’s Information Manual thoroughly explains the types and uses of airport
lighting aids
