Live data from Hacker News

Air India Express 737 Hits ILS, Damages Wall on Departure, Flies for 4 Hours

flightradar24.com

211–220 of 255 posts

Re: Air India Express 737 Hits ILS, Damages Wall on Departure, Flies for 4 Hours

#211

Earlier quoted context omitted.

If they went to burn the fuel, going somewhere and returning is easier than circling for 4 hours.

You would prefer to stay near an airport, rather than far away over the sea.

And you would want to stay at low altitude, where you can burn the fuel much, much faster as well as divert more quickly if anything went south.

Nothing gets better at FL360 in this situation if your intention all along was to divert.

Re: Air India Express 737 Hits ILS, Damages Wall on Departure, Flies for 4 Hours

#212
post #147
post #97

Unless I'm misinterpreting the satellite image its ~150m from the end of the runway to that wall[0] and it also looks a bit downhill from the runway to the wall[1]. I don't see how this could happen without the pilots noticing; they would have been skimming the ground well past the end of the runway. [0] https://www.google.com/maps/place/Tiruchirapalli+Internation... [1] https://twitter.com/shukla_tarun/status/105058…

Perhaps they were slightly airborne, like 0.5m above the ground, but ground-based instruments recorded the plane as still being "on the ground" (i.e. same altitude as the runway) because of the downhill slope? If they really were on the ground, the pilots would have continued to feel the vibration of the wheels against the ground, a very clear indication that they aren't flying. I'm even more surprised that the plane…

I have no first-hand information, but I think this is going to turn out to be a reduced thrust takeoff with the crew being unaware of that (meaning they screwed up).

Airliners have enough power to lose an engine at a decision speed (V1) while still on the runway and on the one remaining engine continue to accelerate on the runway to rotation and eventually liftoff speed and still clear obstacles. There is no mention of an engine loss causing this issue (and surely the airplane wouldn't launch for FL360 with one engine INOP), so this almost has to be a mis-set takeoff thrust accident as, with both engines set for proper takeoff thrust, it's rare to use more than 2/3 of the runway and the initial climb is brisk due to the large excess of power a turbojet engine has at sea level.

Re: Air India Express 737 Hits ILS, Damages Wall on Departure, Flies for 4 Hours

#213
post #128

Earlier quoted context omitted.

Less stress imho. At altitude the forces on wings/structure are far less than during takeoff.

Incorrect. In level flight the wings have - by definition - 1g of upward load. Regardless of speed or altitude.

1g in up/down force. But thicker air means more forwards/back forces. Higher engine power = more force, regardless of G.

Re: Air India Express 737 Hits ILS, Damages Wall on Departure, Flies for 4 Hours

#214
post #51
post #27

If anything this is great free advertisement for Boeing's quality.

As a pilot once told me: "If it ain't Boeing, I ain't going"

Brand loyalty is an amazingly powerful thing.

I wonder if anyone says, “I won’t be there Gus if it isn’t an Airbus”.

Re: Air India Express 737 Hits ILS, Damages Wall on Departure, Flies for 4 Hours

#215
post #25

I have been trying to go over how this could happen. The damage to the wall seems so severe that I would image even over the sound of the engine the pilot would hear and notice that they had hit a wall. Flying the plane at this point would be risking their life. The first thing that came to my mind was the only reason a pilot would risk his life is if his life was already at risk and if he had been drinking when he h…

After V1, the accelerate-stop distance, the pilot is committed to continue flying. The cargo area of most airliners is not pressurized, so the gash is not an immediate problem. In a case like this, the pilots would want to climb to several thousand feet and evaluate the situation before landing. Looks like the pilot did a great job once it was realized the airplane was damaged of remaining calm and flying the airplan…

V1 is the takeoff decision speed, not the accelerate-stop distance.

The accelerate stop distance is the distance it takes to accelerate to V1, reject the takeoff, and stop the aircraft. V1 is in KIAS (knots of indicated airspeed). ASD is in feet/meters.

You are correct that passing V1, the aircraft is committed to fly unless an emergency relating to controllability surfaces.

Re: Air India Express 737 Hits ILS, Damages Wall on Departure, Flies for 4 Hours

#216
post #130

Earlier quoted context omitted.

Is it possible that Dubai refused to let them land with a flyable but potentially pretty broken plane?

Do you think it's even theoretically possible that an air traffic controller will say "looks like you might be having trouble with your plane... we're not going to allow you to land here. Go elsewhere"

No. If the pilot declares an emergency the pilot is in command, effectively.

Re: Air India Express 737 Hits ILS, Damages Wall on Departure, Flies for 4 Hours

#217
post #25

I have been trying to go over how this could happen. The damage to the wall seems so severe that I would image even over the sound of the engine the pilot would hear and notice that they had hit a wall. Flying the plane at this point would be risking their life. The first thing that came to my mind was the only reason a pilot would risk his life is if his life was already at risk and if he had been drinking when he h…

After V1, the accelerate-stop distance, the pilot is committed to continue flying. The cargo area of most airliners is not pressurized, so the gash is not an immediate problem. In a case like this, the pilots would want to climb to several thousand feet and evaluate the situation before landing. Looks like the pilot did a great job once it was realized the airplane was damaged of remaining calm and flying the airplan…

> After V1, the accelerate-stop distance, the pilot is committed to continue flying.

I'm not a pilot, but I'm 100% sure V1 means you can't safely abort the takeoff, _not_ that you're committed to the remainder of the flight.

Also, the ILS is at the end of the runway, they were surely airborne by this point (i.e. past V2), so I'm not sure why you even brought up V1 in this discussion.

In fact, I can't imagine being so low at the end of the runway. At somewhere like Midway (MDW), you'd almost certainly hit a house, at the very very least the perimeter fence.

> In a case like this, the pilots would want to climb to several thousand feet and evaluate the situation before landing.

I'm fairly certain that in an emergency situation you don't "evaluate the situation". Short of actually being unable to fly, you have to take off after V1. If there is any issue whatsoever, you alert the tower and begin to come around to do an emergency landing using "normal" emergency procedures.

Re: Air India Express 737 Hits ILS, Damages Wall on Departure, Flies for 4 Hours

#218

Earlier quoted context omitted.

Those incidents (CAL611, JAL123) only happened because the repair was completed improperly to begin with and subsequently missed by every inspection. There's no reason the aircraft can't be properly repaired, and be as strong as it was when it was delivered. The Boeing Structural Repair Manual is very precise. It was just ignored.

The problem here is that the plane climbed risking catastrophic depressurization - you cannot repair in flight, you need to land first for that.

GP was proposing scrapping the aircraft, which is not necessary for ground repairs.

Re: Air India Express 737 Hits ILS, Damages Wall on Departure, Flies for 4 Hours

#219

Earlier quoted context omitted.

Over at http://pprune.org the suggestion is that the pilot's seat was not locked into position correctly and slid back during takeoff. This caused the pilot to pull back on the stick too early and his instinct was the push forward to keep the plane on the correct trajectory. He likely over-corrected and ended up flying 6ft off the ground at the end of the runway where the landing gear caught an antenna and the chainl…

From that thread: https://youtu.be/t9Ugn0jq_60 Those passengers just won the lottery.

And quite probably many people living just past the end of the runway.

Re: Air India Express 737 Hits ILS, Damages Wall on Departure, Flies for 4 Hours

#220

Why is there a brick wall so close to runaway?

Usually? Because there's an urban area with people and highways and houses past the runway.

As far as I can tell this wasn't unusually close to the runway, the plane just stayed on the ground far past the end of the runway.

Post reply on HN