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Now Playing: Landing St. Maarten from Cockpit 747
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Description:
Landing St.Maarten from cockpit 747. After nosewheel landing camera
touched windshield causing crackling noise.
For those viewers who
made comments (or new viewers who are thinking about making the
comment) that this approach is too high and/or too fast or whatever
else you might think, here some free ;) flying lessons from someone
whos flying B747s for 20 years
On an approach on instruments a
B747 should cross the runway threshold ( the piano keys) with the
main wheels at ± 35 ft above threshold. The 747 is so big that at
that point the altitude of the cockpit is 35 ft higher, so the
cockpit is at ± 70 ft when main wheels cross the threshold.
On a
visual approach, as is the case here at St.Maarten, we have to have
some more margin. Normally the pilot aims to see the runway
threshold disappear under the nose at 80 ft (mind you, the main
wheels are at that moment still NOT above the threshold) to have
sufficient main wheel clearance.
If you look at the video and
notice the altitude callouts, youll see the threshold disappear
under the nose at the call 50, so actually I am a bit too low in
stead of too high. (In fact I am only too low for a visual approach.
If you look at my landing at JFK
http//www.youtube.com/watch?vq4YoXy... you will see that I cross
the threshold also at 50 ft, which is normal on an instrument
approach. Note the automatic altitude callouts you hear on this
video are Radio Altimeter altitudes. The Radio Alt is zero when the
main gear is on the ground with struts extended.)
Now, there are
quite some viewers who think we landed too far on the runway. What
follows from earlier explanation is this
We approach a runway at a
three degrees approach angle. If main wheels cross the threshold at
the correct altitude, the main wheels will hit the runway at approx
900ft (300m) behind the threshold, that is, if you dont flare the
airplane. If you look again at the video and wait till you hear
50,40,30,20,10 and see the solid white markers, they are at 900ft
behind the threshold and the plane touches down right behind them,
because I did flare the airplane. (Passengers seem to hate hard
landings!!)
THIS IS THE NORMAL TOUCHDOWN POINT FOR A B747.
The
FCTM(Flight Crew Training Manual) from Boeing says flare distance
is approx 300 to 600mtr (900 to 1800ft) beyond the threshold.
So,
please, stop nagging about this landing being too far on the
runway.
And then something about too fast On this approach the
747 weighs about 260.000 kgs. The required approach speed is then
150 kts which is about 175 mph or 280 km/hr. So what about TOO FAST?
If we fly slower, we will fall out of the air!!
- Tags: Landing cockpit Boeing 747 B747 St Maarten Martin Approach Airplane Video
- Added: 25-01-10 Views: (866)
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