Landing gear-up

A side slip is nose high and can be more dangerous than a forward slip. Less aileron and more rudder.

 

UPDATE: Yves from the French section kindly provided us with a translation of
the French in the video - and yep, seems they never noticed the alarms!!

Jedi

From Yves:

Hi,
They are not really discussing the landing gear. If fact they apparently did not realize what was happening.
After the alarm stops it goes approximately like this:
- ****, ****, ****! (Edit: censored by FChat )
...
- I was too focused on the plane before us, I did not see the smoke (?)
- Yeah neither do I.
...
- That is not good.

Nb: not sure what smoke he is talking about, not even sure it is the word he uses in French

Best

Yves

 

The plane is from Luxembourg and the pilots use some slang (1) and some other words that may be specific to their version of French.

(1) As "je chouffais" (I was looking at) towards the end of the tape.

 

A little more info: http://www.kathrynsreport.com/2011/11/raw-video-airplane-crash-altiport-de.html

 

I'm not sure about other airplanes equipped with G1000 avionics, but in my Mooney Ovation, the nice little lady speaks into my headset. "Check Gear". Much more effective than a buzzer.

 

If they can tune that beep out, they can tune a nice lady out too. Warnings don't work if they are not heeded.

 

Curious, do noise cancelling headsets take constant ambient noise and eliminate it? I've never used them, so don't know. But is it possible the horn became a "constant" background sound that was eliminated? Not an excuse, but a possible explaination.

You can see that they're high. The pilots probably wondering why he can't get the plane down. The lack of gear drag is a big factor. It should have been a clue.

As far as slips, I always thought they were exactly the same.....side slip/ forward slip except for the direction. They both use cross controls. They both need either nose down or more power due to extra drag caused by exposed fuselage side. Otherwise speed decreases.
1: During a crosswind landing, it's called a side slip. Your nose is pointing down the runway centerline. Your slipping to the side relative to your runway, but the crosswind is pushing you back, so you achieve a flight path thats straight down the runway. You want to land like this in a crosswind. That way the wheels are pointing down the runway when you touchdown.
2: During a no wind landing, it's a forward slip. Your nose isn't pointing down the runway centerline. But your airplane is tracking down the centerline. IF your nose was pointing down the centerline, you'd drift off the runway. So you must face the nose away from the centerline. You can't...or shoudn't land like this. Although the aircraft is tracking down the runway, your wheels aren't. When they hit, the wheels will want to steer the airplane away from centerline.

In the 747, and many other jets, a sideslip isn't used because you would have a wing low (the upwind wing) landing. In the 747, 6 degrees of bank will cause an engine to hit the ground. That's not much bank. So we fly crabbed all the way to touchdown, or shortly before, and then use the rudder to bring the nose around to the runway heading. Preferrably shortly before touchdown, as this keeps the wheels pointing in the direction of travel. If too soon before touchdown, the aircraft will start to drift off of centerline. And the only way to get it back is to roll back. But we can't do much of that due to engine clearance.


Not a great example, but you get the picture.....
[ame]http://www.youtube.com/watch?v=n9yF09DMrrI[/ame]

 

Noise cancelling headsets are designed to attenuate low frequency signals (drones, thrums, etc). A high frequency tone should pass through untouched (e.g. voice/music). The persistence of the tone, low or high frequency shouldn't change the filtering (they're not that sophisticated). The alert that sounded was well into the mid-range and should not have been affected.

 

Thanks for that info. I thought they took whatever the ambient noise was and just shifted the phase to cancel it out. So any noise that's constant would be filtered.

 

Yes, that's what they do; but what's fed back 180 degrees out of phase is the low frequency component of any audio outside the headphone shell. This results in what I described.