Full emergency at Gatwick, 23 August 2008

[Fournier Boy]

rhutch1011 - I have been in touch with someone who also was on board and who works for the airline. It was a bird strike; presumably therefore to an engine. Would have had to dump fuel before returning to land hence the "flyabout".


Well from reading your posts, there are probably around 10 very bemused guys as to how you came about this information. Again, we find speculation rather than fact coming out as gosspel here. Let the airline announce (if it wishes) its findings and don't speculate what a friend who heard this and that has said.

It doesn't help anybody.

FB

[Intruder]

Is there a similar breakdown of "fully ready for takeoff"?

[ladyflyby]

We (the crew) assumed it was a bird strike but were told otherwise by the flight deck.

[eastern wiseguy]

fully ready for takeoff"?

Yes




You are ....or you aren't

[cloudbasezero]

I think ladyflyby has posted the most authoritive account of events as I think anybody will get for now until or if airline releases further statements, tho Im sure somebody will re-write or contradict events from their own remote stand point.

I hope you enjoyed that well deserved drink down the pub ladyflyby

[Fournier Boy]

Exactly, "assumed" is the problem. Assumptions are not fact.

Ladyflyby - you and I probably met on a number of occasions today, before and after the event. At any point afterwards had you asked we could have told you what we thought a range of reasons could be for it happening. As it is, we're still narrowing down the options and I'm sure the company will be aware overnight. They can then say what it was if they feel the need to. Irrespective, shes getting a new engine as I type and will be back online in the morning.

[rick0]

UK Airshow Review - iB::Topic::Virgin 747 G-VLIP in trouble

Some interesting, relevant photos.

[oversteer]

Irrespective, shes getting a new engine as I type and will be back online in the morning.

I had no idea the turnaround was that quick, that's amazing. Is there a warehouse somewhere with a few spare (RR?) engines in it?

[World of Tweed]

VAA B744s are fitted with General Electric CF6's. And yes.... the Engine overhaul and storage facility is just south of the runway at LGW not far from that church that the BAA would love to knock down.

[ExSp33db1rd]

Is there a warehouse somewhere with a few spare (RR?) engines in it?

oversteer. - Yes. ( do you think they have to go out and order another one, with a delivery date sometime next year ? )

[markadams]

I witnessed this incident as a passenger whilst taxiing near the runway as the 747 took off yesterday morning. Because of the angles of view I did not see if there was a problem until rotation, when it passed us. At rotation and during the part of the initial climb that I could see, orange flames trailed the No 1 engine in regular double pulses, each double pulse with an interval of about 1.5 seconds. The flames appeared detached from the engine by about 10 metres and the flames themselves seemed about 15 metres long. It reminded me of the recent footage of the ?Britannia? 757 following a birdstrike.

[rhutch1011]

Fournier Boy: "Well from reading your posts, there are probably around 10 very bemused guys as to how you came about this information. Again, we find speculation rather than fact coming out as gosspel here. Let the airline announce (if it wishes) its findings and don't speculate what a friend who heard this and that has said."

Well, some people are rather touchy. If all we wanted was to hear what was on the news, there would be no need for a forum such as this. I was of the impression that such fora allowed for the personal exchange of information between individuals, sometimes giving an insight into what is going on. Now that I have been scolded I will have to revert to only watching the BBC.

[lomapaseo]

I witnessed this incident as a passenger whilst taxiing near the runway as the 747 took off yesterday morning. Because of the angles of view I did not see if there was a problem until rotation, when it passed us. At rotation and during the part of the initial climb that I could see, orange flames trailed the No 1 engine in regular double pulses, each double pulse with an interval of about 1.5 seconds. The flames appeared detached from the engine by about 10 metres and the flames themselves seemed about 15 metres long. It reminded me of the recent footage of the ?Britannia? 757 following a birdstrike.

very descriptive and enlightening.

You are describing a classic engine stall/surge response to an internal problem. The engine is not quite sick enough to run down so it tries to recover to the same power setting that it demonstrated that it could not handle.

If left alone it would probably overtemp.

One could point at the possible causes, but the idea is to just fix it for now and think about insurrance claims later.

[Self Loading Freight]

From where I sit it doesnt look like a bird strike......... PS Heavy things those donks!

You don't need much by way of forensics to ID a bird strike, and the taciturn aura around this incident does suggest that something a bit more interesting is afoot. That's interesting in a "I was floating around the skies in one of G-VLIP's sister ships at the time; I hope it's not systemic" way.

Incidentally, the pix of the fuel venting were impressive. Surprised Beardy doesn't add a couple of red and blue diesel injectors and do the airshow circuit.

R

[tocamak]

Dumping

Not familiar with heavy aircraft ops so genuine questions:-

How much fuel would have needed to be dumped?
How does the kero dissipate?
How much overweight can you land in this situation?

Nice pictures

[Dream Buster]

Bird strike - smell of 'roast chicken?'

SLF,

If an engine ingested a hapless bird - was there a smell of 'roast chicken' shortly afterwards?

What might that prove, seriously?

DB

[ladyflyby]

I have flown on her twice since Monday! Spanking new engine I must say, the best of all four!

[downunderscouser]

The continuous pulses is because continuous ignition is switched on precisely for that reason. I think the double pulses will be due to ignition set to "both" igniters.

[Checkboard]

If an engine ingested a hapless bird - was there a smell of 'roast chicken' shortly afterwards?

When an engine ingests a bird, if it is in the right spot, you get a smell of "burnt hair", from the feathers. Not very appetising.

How much fuel would have needed to be dumped?

The 747-400 Has a maximum take-off weight of 396,890 kg, and a maximum landing weight of 295,742 kg, so fuel dump could be up to 100,000 kg! In this case it would be much less. I would guess a ballpark fuel load of 130,000 kg, on a zero fuel weight of about 220,000kg, giving a take off weight of 350,000kg, and thus about 30,000kg to dump, after burning flight fuel - very rough figures, give or take 10 tons

How does the kero dissipate?

It breaks into small droplets as it is sprayed from the fuel dump nozzles, and completely evaporates into the atmosphere if it is dumped abouve about 3000 feet.

How much overweight can you land in this situation?

You can land at the maximum take-off weight, if you have to, without damage if you make a reasonably smooth landing. If you land over the maximum landing weight there is a standard "overweight landing inspection" required, which might take a couple of man hours of engineering time.

[Shanwick Shanwick]

Give or take about 50 tons!?

ZFW about 220000
MLW 285762
TOF 85000ish

About 20T to dump in about 25 mins