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En Route IFR Charts
Block 3
| Question | Answer |
|---|---|
| En Route Low Altitude Chart | provides aeronautical information for en route navigation during instrument flight below 18,000 feet MSL. Updated every 56 days. |
| Layout of En Route Low Altitude Chart | normally divided with the western half on one side and the eastern half on the other, but a few are oriented north/south |
| Chart Designations of En Route Low Altitude Chart | L-1 to L-36 along with IFR area charts |
| How are IFR routes listed? | first in ascending numerical order, followed by the VFR Routes (VRs), also in ascending numerical order. |
| Which airports are depicted in the En Route Low Chart? | Airports with an Instrument Approach Procedures (IAP) and/or a hard-surfaced runway >3,000 feet are depicted. |
| Airports with approved IAPs are depicted in _____ and _____. | Blue and Green |
| When included in the airport data, (A) means _____. | Automatic Terminal Information Service (ATIS) is available |
| A star (*) in the airport data could be used to indicate _____. | Part-time status of surrounding airspace |
| VHR/UHF Data is depicted in ____ (color) | Black |
| LF/MF Data is depicted in ____ (color) | Brown |
| What does it mean if a (T) is displayed? | indicates a Terminal class NAVAID with a service volume of 25 NM and 12,000 feet. |
| RNAV data is depicted in ___ (color) | Blue |
| Minimum Obstruction Clearance Altitude (MOCA) | the lowest published altitude in effect between radio fixes on VOR airways, off-airway routes, or route segments for obstacle clearance requirements and that assures acceptable navigational signal coverage within 25 statute (22 nautical) miles of a VOR. |
| The MOCA is preceded by what? | an asterisk. |
| Minimum En Route Altitude (MEA) | the lowest published altitude between radio fixes that assures acceptable navigational signal coverage and meets obstacle clearance requirements between those fixes. |
| Maximum Authorized Altitude (MAA) | maximum usable altitude or flight level for an airspace structure or route segment. It is the highest altitude at which adequate reception of NAVAID signals is assured. |
| Minimum Reception Altitude (MRA) | lowest altitude at which an intersection can be determined. |
| Minimum Crossing Altitude (MCA) | lowest altitude at certain fixes at which an aircraft must cross when proceeding in the direction of a higher MEA. |
| What does an open, white area indicate in the Low and High En Route Charts? | Class E Airspace (low) and Class A Airspace (High) |
| What are Class B, C and Mode C Area depicted? | Class B - shaded blue with solid blue lines Class C - shaded blue with dashed blue lines Mode C - white with solid blue line |
| Off Route Obstruction Clearance Altitude (OROCA) | Altitude provides obstruction clearance based on the highest known feature (either terrain or obstructions) to be found within that section of the chart; NO guaranteed NAVAID signal |
| How are Prohibited, Restricted, and Warning Areas shown? | within a blue hatched boundary |
| Alert Areas and Military Operations Areas (MOAs) are confined | within a light brown hatched boundary and are only shown in the En Route Low Altitude Chart. |
| Light brown shading indicates the presence of _____. | Uncontrolled airspace |
| The effective altitude in the MOA is the ____. | base of the altitude limit and extends up to 18,000 MSL |
| En Route High Altitude charts | \\ provide aeronautical information for en route navigation during instrument flight at or above 18,000 feet MSL. |
| Airports shown in En Route High Altitude are only | airports with hard-surfaced runways at least 5,000 feet long are shown. |
| Prohibited, Restricted, and Warning Areas are listed in ____ order within each category of SUA | numerical |
| Class A airspace is depicted on En Route High Altitude Charts by the ____ areas. | open white |
| All Navigational Aids (NAVAIDs) shown on En Route High Altitude charts are | "H" class unless identified as "L" or "T" |
| “L” or “T” class NAVAIDs located off jet routes are shown in | light gray |
| What chart furnishes terminal data for IFR flight in congested areas? | IFR area charts |
| The obstruction clearance the OROCA ensures on an En Route Low Altitude Chart is | 1,000 foot buffer in mountainous areas and 2,000 foot buffer in non-mountainous areas |
| Which chart is designed to provide aeronautical information during instrument flight? | IFR En Route Low Altitude Chart |
| When no MEA is depicted, the MEAN on a jet route is | 18,000 MSL |
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