Delta 767 runway excursion in MAD

[foxcharliep2]

MAD-Barajas reports runway 32 L closed for inspection after a Delta 767 left the runway following an emergency landing.

The a/c had taken off from MAD but burst a tire on t/o and returned to MAD.

Landing it experienced problems with the main ldg gear and a small fire broke out which was extinguished by fire services.

No injuries reported.

A picture posted on twitter by a pax also shows a hole in the right wing.

See: Un avión se sale de pista al aterrizar en Barajas sin provocar heridos | Madrid | EL PAÍS

[fdgolf]

You can take a closer look in this article's pics. (Article in Spanish)

Un avión regresa a Barajas tras reventarle la rueda

[tightcircuit]

One photo shows the main gear doors open. During normal gear extension they close again. If it landed with them open then that indicates they had to lower the gear using the alternate system. This in turn indicates that they had lost the centre hydraulic system.

Using the alternate extension system the up-locks are released electrically and the gear free falls under gravity to the down position. Large springs then secure the down lock arms. The main gear doors remain open but there is still ground clearance.

Nose wheel steering is also powered by the centre hyd but there is a reserve system so it should still have been working. Normal brakes are powered by the right hyd system

[A4]

Appears to be a low speed excursion off a taxiway after a successful landing. Presumably tyre debris penetrated right through the top of the wing?

Tightcircuit, does loss of that hydraulic system take out the steering too?

We're typing over each other here

[tightcircuit]

Taxiway J3, quite a long way from the runway!

Yes sorry A4 I thought I had better add the bit about the steering after I had already posted.

[ATC Watcher]

The "hole in the wing" photo take by the pax while a/c still in flight is interesting. any idea what the hanging thing is ? Caused by a tyre debris ?

[Spanner Turner]

The "hanging thing" is the r/h gear alternate anti-skid module.
A pretty good whack to punch this off its mounting plus the 4 hydraulic tubes that are fitted to it plus upper wing panel. A large chunk of rubber going pretty well straight up from #8 wheel must've done the damage. You can see the wheel minus it's tyre in one of the photos. Alternate braking is from centre hydraulics so centre fluid would have been lost when module was hit. Thus the alternate gear extension as ext/ret is powered from centre system.

[DOVES]

And what about the brakes tightcircuit?

[bluepilot]

Is it not the left system hydraulics that power landing gear and nose wheel steering plus alternate brakes?

[tightcircuit]

That's on the 75 bluepilot.

Normal brakes come off the right system DOVES with alternate brakes from the centre. There is also a reserve brake system coupled with the reserve steering system and as a final back-up the brake accumulator.

Thanks Spanner Turner, I could see all the loose pipes and guessed it was a module connected to the centre system.

This is a scenario often practiced in the sim. It is not difficult to imagine that a damaged tyre flailing about near a load of hydraulic fittings may cause a problem.

The interesting question remains; how come they landed and vacated the runway successfully but then went off the side of a taxiway quite some distance further on?

[lomapaseo]

I rare incident associated with a tire failure . Likely to involve a major investigation of the damage and systems lost.

[VFD]

The interesting question remains; how come they landed and vacated the runway successfully but then went off the side of a taxiway quite some distance further on

Speculation only but finally lost all hydraulic fluid for steering/brakes or ran out of accumulator pressure for those items.

[misd-agin]

VFD - more likely ran out of standpipe fluid vs. accumulator pressure. Accumulator is for the 4th level of brakes, standpipe is backup for the third level and rsv steering.

Ran out of 3rd level, used 4th level to stop??

[BEagle]

The interesting question remains; how come they landed and vacated the runway successfully but then went off the side of a taxiway quite some distance further on

Surely the point is why, having cleared the RW following such a serious incident involving possible landing gear integrity, they didn't stop, shut down, have the pax taken to the terminal by bus and the aircraft towed to a parking spot. Preferably with the landing gear pinned.

[transilvana]

The aircraft touched down almost mid runway.

[Aluminium shuffler]

So, a high weight, highish altitude landing with possible control issues and maybe extra speed if having to use limited flaps, touching down half way down the runway using alternate brakes. Could it be that he lost braking ability through brake fade while taxying and steered off onto the soft ground to stop the aircraft if he was taxying downslope?

[JanetFlight]

One question:

Is it safe to retract the gear after a Tyre Burst?

Couldnt happen the same as many years ago with the Hajj Diesel8 Nationair?

[The Dominican]

One question:

Is it safe to retract the gear after a Tyre Burst?

Couldnt happen the same as many years ago with the Hajj Diesel8 Nationair?

As a result of the investigation into the accident you mentioned is why they installed wheel well fire indicators..! Besides, it might not be so apparent during the T/O roll that you had a tire burst (no significant yaw change or feeling on the rudder pedals) you might feel something is wrong but not really compute that it is a tire, by that time your natural reaction will be to raise the gear as you always do.

[MrDK]

Cameras

Why does a modern (or an up-to-date) aircraft not cameras all over the place?
At least as a secondary tool.
Installation may be costly, but the equipment is not.
A camera for each gear, each engine, each set of flaps, a couple for the tail, ect. would hardly be a technological advance.

[Nightstop]

Could it be that he lost braking ability through brake fade while taxying and steered off onto the soft ground to stop the aircraft if he was taxying downslope?

MAD has EMAS at the end of both 32L and 32R. Personally I would have gone for 32R which has a less unpleasant overrun, but I wasn't there...