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-   -   Asiana 777 Crash at SFO (https://www.airlinepilotforums.com/safety/75814-asiana-777-crash-sfo.html)

Timbo 07-02-2014 01:59 PM


Originally Posted by beech1980 (Post 1676379)
I always turn the auto throttles off when I turn off the auto pilot. It is re-iterated often during training, IOE and recurrent to do so. Just like flying a big 172...

I always did that too, in my 12 years on the 757/767, worked great. But when I went to the 777, they were quite adamant about NOT turning off the A/T's, ever, as mentioned above, it's the new Boeing Way. I do keep my hands on top of them, and I do override them at times, either pushing up when getting slow, or pulling back if getting high/hot.

A friend of mine also on the 777 said he did turn off the A/T's once for a visual landing. He said it was the hardest landing of his career! :eek:

After he told me that (about 5 years ago), I really started paying attention to exactly what the A/T's were doing in the flare, both on hand flown landings and auto-lands. They almost always come fwd about an inch for a little extra thrust as you round out at about 20'.

I'm pretty sure they are tied into the radio altimeter and VVI, as well as the airspeed, but I'm no Boeing engineer so I'm not sure exactly what they are looking at in the last 100'. It does do some of the smoothest auto-lands I've ever seen though, so it's doing something right! ;)

One thing that will ruin a nice smooth hand flown landing though, is the sudden pop-up of the auto-speed brakes, before all 12 main tires are on the pavement, so on my landings, I usually hold the speed brake handle and let it come back slowly, at about half speed, vs. let it pop up and drop us the last 3'.

beech1980 07-02-2014 02:49 PM

Is it because of the long spool up time on those big 777 fans?

Airhoss 07-02-2014 06:32 PM

Not my experience at all with the 777 and auto throttles. I almost always turned them off on a visual. I did however turn off the arm switches which will provide you wake up in certain circumstances.

KC10 FATboy 07-03-2014 04:00 PM


Originally Posted by 80ktsClamp (Post 1676043)
They were in FLCH. Autothrottle wake-up is inhibited 100% of the time in FLCH.

....and that is quite a poor design.

I don't believe it is a poor design because the entire idea of FLCH is to pitch for speed. Had the autopilot been engaged, they never would have stalled. He put the airplane into a pitch for airspeed mode and didn't hold the required pitch. They also failed miserably at basic airmanship and CRM/TEM.

KC10 FATboy 07-03-2014 04:02 PM


Originally Posted by DCA A321 FO (Post 1676121)
I say this because I shot a VNAV (similar to a V/S) approach the other day when the ILS was OTS for the first time in 6 years on the airplane. It was a non-event. In fact, when we saw the ILS OTS on the atis, the other FO and I said, cool, we get to practice a VNAV for real.

Really? I fly a lot of VNAV approaches, especially on visuals (a visual backed up by the RNAV approach).

DCA A321 FO 07-03-2014 10:17 PM


Originally Posted by KC10 FATboy (Post 1677215)
Really? I fly a lot of VNAV approaches, especially on visuals (a visual backed up by the RNAV approach).

Really dude, that's why my company put a couple quick review pages in our QRH (Quick Reference Handbook), because some of us don't shoot them that often.

80ktsClamp 07-03-2014 10:24 PM


Originally Posted by KC10 FATboy (Post 1677215)
Really? I fly a lot of VNAV approaches, especially on visuals (a visual backed up by the RNAV approach).

Remember we have our quick reference cards in the FAT for everything non-ILS to make all the non-ILS stuff a non-event. Other airlines may not have the same handy items. Additionally, with the VNAV to the feather protocol that we have, we run that stuff even on ILS's a lot more than other carriers may.

80ktsClamp 07-03-2014 10:27 PM


Originally Posted by KC10 FATboy (Post 1677214)
I don't believe it is a poor design because the entire idea of FLCH is to pitch for speed. Had the autopilot been engaged, they never would have stalled. He put the airplane into a pitch for airspeed mode and didn't hold the required pitch. They also failed miserably at basic airmanship and CRM/TEM.

It's strange at the least with the hybrid design of the 777. It poses as a super modern airliner, but yet in more than a few modes than other super modern airliners will just let you go there. "Wake-up" is a stall protection that they are trained is there. 777 pilots in most arenas are trained to never turn the A/T off. The A/T column on the FMA was green and the saturated pilots assumed it was active I'm sure.

It was a combination of poor airmanship, poor systems management/awareness, poor energy management, and the strange no wake-up in FLCH sure didn't help matters.

iceman49 07-04-2014 06:29 PM


Originally Posted by 80ktsClamp (Post 1677359)
It's strange at the least with the hybrid design of the 777. It poses as a super modern airliner, but yet in more than a few modes than other super modern airliners will just let you go there. "Wake-up" is a stall protection that they are trained is there. 777 pilots in most arenas are trained to never turn the A/T off. The A/T column on the FMA was green and the saturated pilots assumed it was active I'm sure.

It was a combination of poor airmanship, poor systems management/awareness, poor energy management, and the strange no wake-up in FLCH sure didn't help matters.

All of the above, automation should help to prevent all of the above not enhance the failures.

Airhoss 07-04-2014 09:03 PM


Originally Posted by Airhoss (Post 1676717)
Not my experience at all with the 777 and auto throttles. I almost always turned them off on a visual. I did however turn off the arm switches which will provide you wake up in certain circumstances.

Should have been, I did NOT turn off the arms switches.....


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