anotherthing - 1000 feet equates to 300 metres (not 330). Available levels would be 300, 600, 900, 1200, 1500, 1800, 2100, 2400 &c. I accept that ATCOs are far more involved in level changes than pilots, particularly in TMAs. Would these metric levels be too difficult to deal with?
An alternative would be to use current 'Flight Level' terminology from sea level upwards - you could then keep the current 1000 ft/ 300 m separations & the RT instructions would be identical to current practice, eg:
"Rebel 471 Mike, descend Level 20, cleared ILS approach." Level 20 would equate to 2000 ft or 1800 metres. The pressure altimeters would be set to QNH of course (or else altimetry derived from GPS).
With this procedure minimum flight altitudes and terrain elevation would be stated on charts as Flight Levels.
Last edited by Julien Evans; 7th Sep 2006 at 11:53.
Reason: adding info