Minimum Alts
Join Date: Feb 2000
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Minimum Obstacle Clearance Altitude, (MOCA), is the lowest altitude that an aircraft can fly on an airway in IMC and still keep safe clearance from terrain and obstacles.
MOCA is often lower than Minimum enroute altitude (MEA), and may put an aircraft below air traffic control RADAR coverage and also below Minimum reception altitude (MRA) for navigation aids.
A cut and paste from Wikipedia, so it could do with further scrutiny.
MOCA is often lower than Minimum enroute altitude (MEA), and may put an aircraft below air traffic control RADAR coverage and also below Minimum reception altitude (MRA) for navigation aids.
A cut and paste from Wikipedia, so it could do with further scrutiny.
Join Date: Jun 2007
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Disclaimer: The following is true in the USA. I make no promises about elsewhere.
* MEA (Minimum En-route Altitude) guarantees both obstacle clearance and adequate reception of the navaids (VORs,NDBs) required to navigate the leg for the entire length of the leg.
* MOCA (Minimum Obstacle Clearance Altitude) guarantees obstacle clearance for the entire length of the leg, but adequate reception of navaids only within 22 nautical miles of the navaids.
* MEA (Minimum En-route Altitude) guarantees both obstacle clearance and adequate reception of the navaids (VORs,NDBs) required to navigate the leg for the entire length of the leg.
* MOCA (Minimum Obstacle Clearance Altitude) guarantees obstacle clearance for the entire length of the leg, but adequate reception of navaids only within 22 nautical miles of the navaids.
