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Features September 2018 Issue

Ya Gotta Fly a DME Arc

The Instrument Procedures Handbook shows arc protected airspace.

Ya Gotta Fly a DME Arc

The IPC requirements in the updated Instrument Airman Certification Standards are pretty much the same as in the old PTS. Bottom line: You still have to fly a DME arc.

A DME arc is a curved track at a constant distance around a facility that offers omnidirectional course information and DME, such as a VORTAC, VOR/DME or NDB/DME. This eliminates ILS or LOC DMEs. An arcís radius is 7- 30 NM and is 5-15 NM long, with 10 NM preferred. Thus, arcs can be lengthy and inefficient. The primary area required obstacle clearance is 1000 feet within four NM of the arc along the initial segment, with a 500-foot secondary clearance extending another two NM. In the intermediate segment, the clearance drops to 500 feet.

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