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  • 16

Boeing 737 Narrowly Avoided Disaster in Belfast After Crew Error

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A Boeing Co. 737 jet struck a light almost 100 feet beyond the end of a runway and just 14 inches high after taking off with insufficient power when its pilots entered the incorrect air-temperature into a computer, according to an air accident bulletin. (www.bloomberg.com) Ещё...

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punkrawk78
Silent Bob 1
Easy to Monday Morning QB but acceleration would've been abnormally slow. Clue #1. And when all else fails and the end of the runway is upon you there's always Emergency Thrust!
Cadefoster
Cade foster 1
All pilots are not created equal and for the industry or public to assume that is wrong.
The differences are glaring when non routine and or emergency circumstances present themselves.
Some pilots would of never ever had made this mistake and others too dependent on tech will make it most times.
Thats just the reality of the very large airline pilot pool and their varying abilities and training and intelligence.
Its the same in every profession.
As an example, for the public/media to assume all airline pilots would have landed say the Airbus in the Hudson safely is at best blind faith.
Highflyer1950
Highflyer1950 0
Would that not have resulted in an FMS error due to the fact insufficient runway available for W A T inputs?
bcanderson
Brian Anderson 7
This isn't an FMS issue. When I walk out on the ramp I already have a pretty good idea what my take off N1 is going to be just by feeling the air temperature on my face. If the OAT there was 16C I'm guessing his take off thrust setting should have been around 93-94%. OK, so he enters the wrong temperature in the box (hey, that can happen) of minus 52C so I'm guessing the box would have returned a takeoff N1 setting of around 80-81%.

So the crew just accepts that number without any further thought and it's "Hey, let's go flying!"?

This is a crew issue. The FMS is just a computer. It's not the boss. The crew is the boss. It's remains the crew's responsibility to stay ahead of the automation.
Highflyer1950
Highflyer1950 1
The thing is Brian, you have do an additional function to get a minus temp on the FMS and the aircraft has no charts or computed data below -40C that I am aware of so the FMS should not have accepted the input. Now if +52C is entered that’s probably the highest temp acceptable for a reduced thrust takeoff (assuming that was the plan) however the runway would have been more than what was available. However you are correct the N1 should have been 98 % instead of 91% if full thrust takeoff was planned?
bcanderson
Brian Anderson 2
I'm just going by what's written in the article. I guess my point is a pilot familiar with the plane should know just about what number the box should be expected to return for conditions on any given day. When the result differs from the pilot's expectations should the box's numbers just be accepted anyway? No, it's the crews responsibility to question the automation, and not just go along for the ride.

And in the case of a planned reduced thrust takeoff setting situation max thrust still remains available to the crew to be used at the crews discretion. Crew should know that number and be ready to use it. Hitting a fourteen inch high light 100 feet past the end of the runway? 'Nuff said.

I'm not a 737 driver so as to what limitations the box can or cannot accept, I don't have that info.
Highflyer1950
Highflyer1950 1
TorstenHoff
Torsten Hoff 3
I think the issue is that the runway length would have been sufficient if the temperature that was entered had been correct. However, isn't there a safety check to validate the entered temperature against the OAT and make sure they are in approximate agreement?
Highflyer1950
Highflyer1950 0
Thanks Torsten, I get that. However, in my aircraft if I enter an erroneous temperature on the perf init page and then select the runway in use for depature it will tell me how much runway is required for the info I have entered. If the runway required exceeds the runway available the FMS will not accept the data. I am unaware if the B737-800/700 FMS operate in a similar manner?
dbaker
Daniel Baker 1
Yes, "it will tell me how much runway is required for the info I have entered" includes the temperature. At the temperature entered (well below actual temperature), it was fine.
Highflyer1950
Highflyer1950 1
Just spitballing here, see my answer to Brian and I agree if indeed -52C was entered and the FMS accepted it, should not have been an issue? cheers.
Highflyer1950
Highflyer1950 1
Just for the record, The lowest temperature was -19.1 °C at Markree Castle on 16 January 1881.[9] Everyone have a Happy Thanksgiving.

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