Razza From United Kingdom, joined Dec 2005, 9 posts, RR: 0 Posted (5 years 3 months 1 day 3 hours ago) and read 2203 times:
Hey there guys...
Stumbled across a rather interesting video on youtube today, of a 747 undergoing some tests before its delivery. I ran a search on the forum for this video and for any information on this procedure but I came across nothing.
Anyhow... without further ado... here is the video:
Sorry if it has been addressed before but basically, can anyone 'in the know' describe what is going on in the cockpit... are they calibrating instruments? is there something in particular they're looking for ?
This is just a WAG, and I'm not too sure about the accuracy of the video's description, but they're definitely hand flying the plane the whole way down, the AP would never do that, and I can't think of a way to induce it to doing so.
Lowrider From United States of America, joined Jun 2004, 3220 posts, RR: 10
Reply 2, posted (5 years 3 months 22 hours ago) and read 2134 times:
The only thing I can think of that they might be testing is the response of the flight directors and localizer CDI's in the plane. But using test equipment on the ground would have to be more cost effective. Otherwise, if that is an autopilot chasing the loc all the way down, I think a replacement might be in order.
747classic From Netherlands, joined Aug 2009, 2292 posts, RR: 15
Reply 4, posted (5 years 3 months 20 hours ago) and read 2093 times:
Quoting Lowrider (Reply 2): The only thing I can think of that they might be testing is the response of the flight directors and localizer CDI's in the plane. But using test equipment on the ground would have to be more cost effective. Otherwise, if that is an autopilot chasing the loc all the way down, I think a replacement might be in order.
It could be a test of the on board ILS system . The antennas can only be properly checked with actual flying.
LOC capture antenna's, active with gear down and installed in the nose doors of the 747-400, could be checked out.
Tracking LOC antenna's are installed in the FWD lower fuselage and active, with gear up.
But IMO it's impossible to determine the exact cause of this strange maneuvers, by only looking at a video shot.
Operating a twin over the ocean, you're always one engine failure from a total emergency.