FCA767 From United Kingdom, joined Nov 2006, 1786 posts, RR: 1 Posted (7 years 10 months 3 weeks 2 days 17 hours ago) and read 1500 times:
To my amazement today when listening to the air traffic, manchester's runways have changed numbers ;-O , when did this happen? and i thought the MAG was 236 degrees last time I checked so even if it went to 235 it would be 24. Anyone able to help me.
BMIFlyer From UK - England, joined Feb 2004, 8810 posts, RR: 57
Reply 3, posted (7 years 10 months 3 weeks 2 days 17 hours ago) and read 1478 times:
Quoting EK20 (Reply 2): Why have they actually changed them? Anyone know?
Magentic variation change, it alters slightly every year, but there comes a time every few years when they actually need to re-designate the runways to compensate for the actual magnetic heading. Something along those lines.
Mhodgson From United Kingdom, joined Dec 2002, 5047 posts, RR: 24
Reply 6, posted (7 years 10 months 3 weeks 2 days 17 hours ago) and read 1469 times:
FMCs are updated on a 28-day cycle, so the change will be incorporated into the next change (in fact, the date was probably selected in order to coincide with a change). The actual heading of the runway will only have changed by one degree, though the ILS courses will need to be updated as well, as well as the runway designators in the FMC database.
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