msa
hello keithl & others, 29 06 2006
with reference to jeppesen approach charts:
msa= min safe altititude, if there is only one altitude published in the middle of the 25nm circle(always also check the location of this middle point).
msa= min sector altitude, if the 25nm circle is sectorized with arrows,(qdm's), pointing towards the middlepoint, with different altitudes in each sector, somewhat alike to the french camembertcheese(but without the smelling)( no offense to the french as i very much like their cheese).
mora(min off route altitude) is an invention of jeppesen & is only related to terrain clearance 10nm left/right of airway centerline: obstacle clearance is 1000ft if reference(obstacle) point is 5000ft or lower & 2000ft if ref point is 5001ft or greater. navaid/ radio reception is not taken into account.
and, please, i fully agree that jaa/jar ops/fcl etc. is far from perfect, but at least, we now have a more or less common standard to operate in. with the massive increase in traffic over the last decades, it would be a nightmare if every other state would still go its own way.
Last edited by blackmail; 30th June 2006 at 07:04.