JWM AIRTRANS From , joined Dec 1969, posts, RR: Posted (15 years 11 months 5 days 5 hours ago) and read 1343 times:
I have finally come upon an aviation question from my dad that I couldn't answer! He asked me how an airplane's clocks work. So how do they work? When you cross over a time zone, does the clock change to local time or what?
OPNLguy From , joined Dec 1969, posts, RR:
Reply 1, posted (15 years 11 months 5 days 4 hours ago) and read 1280 times:
As far as I'm aware, aircraft clocks (at least in the airline world) are set to UTC (aka GMT or Zulu time). This is what the ATC uses, especially when giving out Expect Further Clearance (EFC) times, and other delay information. Once you set the clock to this time, there's no need to change it, as UTC doesn't change with the time zones. The *conversion factor* to local time and standard/daylight savings times will vary. It's easier for most of us airline grunts to stay on UTC...
Buff From Australia, joined Mar 2007, 0 posts, RR: 1
Reply 3, posted (15 years 11 months 4 days 21 hours ago) and read 1265 times:
To update the clock manually (as we have to on our dinosaur 757), we tune in WWV or WWVH on 2.5, 5.0, 10.0 or 15.0 KHz, or Canadian CHU on 3330, 7335 or 14670 KHz and listen for the "beep" every minute on the minute. There are other stations around the world, but these are the principle North American and Pacific time signal stations.