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EK407 Tailstrike @ ML

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EK407 Tailstrike @ ML

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Old 24th Mar 2009, 06:10
  #221 (permalink)  
 
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Overrun

I will back up White Knight unequivocally. He is correct. The crew remained in Melbourne, pending arrival of EK Flight Safety personnel, and the EK the A340 Tech Pilot who will overlap with the Aussies to investigate.
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Old 24th Mar 2009, 06:15
  #222 (permalink)  
 
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The SQ 744 that scraped in Auckland had an extended stay at NZAA till its bum was tidied up. I believe they had to ship in special gear and erect a temporary hangar for the job to be done.
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Old 24th Mar 2009, 06:42
  #223 (permalink)  
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China Airlines Flight CI611, Boeing Model 747, B-18255

Link to FAA site on the structural repair of a China Airlines 747, as a result of a tail strike, that failed 22 years later.

Lessons Learned From Transport Airplane Accidents
 
Old 24th Mar 2009, 07:29
  #224 (permalink)  

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Grunty,

The accident report you refer to also mentioned - at the risk of thread drift -that China Airlines maintenance planning/MRO had failed to address re-inspections of the repaired area and CPCP (inspections for corrosion) requirements. Typical chain.
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Old 24th Mar 2009, 09:34
  #225 (permalink)  
 
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Failures after tail scrapes

I am sure the lessons learnt following the loss of the JAL B747, as a result of an improper repair to the rear pressure bulkhead following a tailscrape, will be uppermost in the minds of those charged with repairing the Airbus.
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Old 24th Mar 2009, 09:48
  #226 (permalink)  
 
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Originally Posted by chainsaw
Where? Melbourne - the only way that aircraft will fly out of Melbourne is: a) after it's been repaired and signed-off as airworthy, or b) as cargo, once it's been disassembled.
Nah - I've seen a lot worse damage than that flying around. Bolt a big external patch over the damage and ferry it unpressurized to the heavy maintenance base.

An AA 767 in London landed on the nose gear and did a massive amount of damage to the fuselage - a few big plates bolted on externally and then ferried back to Mr Boeing in Seattle.
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Old 24th Mar 2009, 11:02
  #227 (permalink)  
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Sparks

Thanks for that Phoenix62 - nice contribution.

I've been curious about the sparks reported by other pax - seems clear that there were sparks of some sort. That was leading me to think about the engines, but you seem to suggest that what you saw was very late on in the take-off run - perhaps at the point of impact with whatever structure was hit? And perhaps due to that impact in fact?
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Old 24th Mar 2009, 11:27
  #228 (permalink)  
 
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Originally Posted by phoenix62
I was a passenger on this flight ...
... I was in the rear of the cabin at seat 34C ...
... there were visible sparks from the window near me.
34C?
Do you sit in the aisle?

Visible sparks seen through the window?
It is impossible to see the sparks of a tail strike through the window.
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Old 24th Mar 2009, 11:34
  #229 (permalink)  
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On the subject of sparks etc. At night any source of light will probably be visible from the passenger windows as a reflection from the aircraft, (White) and the ground, as with an engine surge, everything around the aircraft lights up at night but, from the cockpit, you don't actually see the flames. I suspect that what the pax saw was the reflected light caused by the sparks, not the sparks themselves?
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Old 24th Mar 2009, 11:35
  #230 (permalink)  
 
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IFP, Well spotted on 34C, which doesn't exist. However, tail strike sparks would probably reflect off the all white engine pods ........ so......
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Old 24th Mar 2009, 11:40
  #231 (permalink)  
 
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Its not that hard to get distracted during flight prep by pursers, redcaps, refuellers, engineers etc all sticking their heads into the cockpit, although MEL is probably not as manic as DXB. This was highlighted during the recent LOSA audit, but it seems nothing was done about it.

I have fallen prey to the "ZFW as TOW" gotcha and had it picked up by the FO or relief crew. Not only embarrassing but quite shocking when you consider the implications.

Now I estimate my Vref30 (Boeing) at preflight briefing based on the planned TOW. It's quieter and there are no distractions to mess with my already poor mathematical skills. I used to check my green dot speed (Airbus) as I recall we had a procedure to cross check it prior to entering the speeds in the FMGC. If my calculated speed is more than a few knots off the FMC/FMGC speed, I want to know why.

For A330 it was something like, Green dot = (TOWx0.6)+107 (This figure has to be increased one knot per thousand feet above FL200, but for takeoff this is obviously not necessary). It's quoted in Vol 3 from memory so you can check the reference.

e.g. TOW of 230t, green dot should be (230x.6)+107 = 245

For Boeing, Vref30 = (GW/3)+66 (this is accurate for the 777-300ER but will vary a few knots for other models).

e.g. TOW of 300t, Vref 30 should be (300/3)+66 = 166
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Old 24th Mar 2009, 11:44
  #232 (permalink)  
 
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It is impossible to see the sparks of a tail strike through the window.
Maybe not the sparks themselves, but...beacon flashes are quite easy to see against the ground during takeoff, and if the sparks off my grinder are anything to go by, dragging the bottom of the aeroplane along the runway would light up the surrounding area like (yellow) daylight. Maybe not see the sparks themselves, but the glow from them, you bet you'd see it.
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Old 24th Mar 2009, 11:46
  #233 (permalink)  
 
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I assume that Phoenix62 means 34B and not C as C doesn't exist!

34 is towards the back though.....
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Old 24th Mar 2009, 13:42
  #234 (permalink)  
 
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Emirates must use the same seating system as CX, the seats are all based on 3 - 4 - 3 seating system so ABC - DEFG - HJK however if you're on an Airbus where the layout is 2 - 4 - 2 in EY the seats go AC - DEFG - HK that way window and aisle seats are always the same, in all CX A/C A & K are window seats, CDGH are aisle seats, so 34C is the left widow group aisle seat, one seat from the window.

Edit: EK is not like CX though.

Last edited by SMOC; 25th Mar 2009 at 03:35.
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Old 24th Mar 2009, 13:55
  #235 (permalink)  
 
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Not so.

See :

SeatGuru Seat Map Emirates Airbus A340-500 (345)

FWIW
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Old 24th Mar 2009, 13:58
  #236 (permalink)  
 
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I might have missed it, but does EK use TODC or books for take-off calculations?
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Old 24th Mar 2009, 14:28
  #237 (permalink)  
 
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Originally Posted by SMOC
I don't know about Emirates but all CX seats are all based on 3 - 4 - 3 seating so ABC - DEFG - HJK however if your on an CX airbus where the layout is 2 - 4 - 2 in EY the seats go AC - DEFG - HK that way window and isle seats are always the same, in all CX A/C A & K are windows CDGH are isle seats, so 34C is the left widow group isle seat.
The Seating Chart of Emitates Airbus A340-500 tells another story:
Emirates | Flying with Emirates | Our Fleet | Seating Chart
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Old 24th Mar 2009, 14:56
  #238 (permalink)  
 
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Sanity Check Required

I have fallen prey to the "ZFW as TOW" gotcha and had it picked up by the FO or relief crew. Not only embarrassing but quite shocking when you consider the implications.
That's why I brought up earlier that whoever is doing the calculations should have a gut feeling as to what the correct answer should be. Maybe these guys are flying too many types and can't remember what a reasonable answer should be. Did this crew fly this type plane to MEL? If so, they should have gotten something close to the same Vr that they got on that outbound leg. That in itself is a safety finding which should prompt a change in airline policy. Also, as previously discussed, some sort of acceleration check is certainly in order.
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Old 24th Mar 2009, 17:00
  #239 (permalink)  
 
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Did this crew fly this type plane to MEL? If so, they should have gotten something close to the same Vr that they got on that outbound leg

Not necessarily. Probably 2 of the crewmembers omboard had been on a "short" hop over to New Zealand between the outbound leg and the leg to DXB with a comparably light aircraft.

AA
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Old 24th Mar 2009, 17:42
  #240 (permalink)  
 
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Basic Airmanship

Not necessarily. Probably 2 of the crewmembers omboard had been on a "short" hop over to New Zealand between the outbound leg and the leg to DXB with a comparably light aircraft.
So, pulling numbers out of a warm spot, if they got a Vr=X for a lightly loaded aircraft for a short leg, then they should have expect to have X+15 for a heavy takeoff. Again, they should have a gut feeling about their results, and if it isn't in the ballpark, they should look at their input and try to figure out where the error lies. Just basic airmanship.
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