Aggiornamenti inchiesta su incidente 777 BA di gennaio 2008

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British Airways crash likely caused by ice in fuel

LONDON, Sept 4 (Reuters) - A British Airways (BAY.L: Quote, Profile, Research, Stock Buzz) plane crash at London's Heathrow airport in January was likely caused by ice in the plane's fuel system, a report into the incident said on Thursday.

The accident, which seriously injured one passenger when the plane landed 1,000 feet short of its intended runway, was not the fault of the flight crew, the Air Accidents Investigation Branch (AAIB) said in an interim report into the incident.
 
Ice in fuel feed system likely reduced thrust on BA 777

Ice in fuel feed system likely reduced thrust on BA 777

Friday September 5, 2008

UK Air Accidents Investigation Branch said that ice within the fuel feed system "most probably" caused restricted fuel flow to the Trent 800s powering the British Airways 777-200ER that crash-landed about 300 m. short of London Heathrow's Runway 27L on Jan. 17.
AAIB released a detailed interim report on the accident investigation yesterday, noting that the flight from Beijing to LHR "was uneventful and the operation of the engines was normal until the final approach." But when autothrottles commanded an increase in thrust, an initial response gave way to reduced thrust of the right engine at about 720 ft. followed by a similar reduction in the left engine about 7 sec. later.
"The reduction in thrust on both engines was the result of less than commanded fuel flows," AAIB said. It added that a possible cause was that "ice had accreted throughout the fuel feed system and then was released during an increased fuel flow demand." It said the ice "is likely to have formed from water that occurred naturally in the fuel whilst the aircraft operated for a long period, with low fuel levels, in an unusually cold environment." It added, though, that BA had "at all times" operated the 777-200ER "within the certified envelope."
AAIB recommended that changes to the fuel system design be examined long-term and that near-term "operational changes to reduce the risk of ice formation" be mandated by EASA and US FAA. But it also noted that "this is the first such event in 6.5 million flight hr." and that the probability of such a scenario reoccurring is "remote."

by Aaron Karp
ATWOnline
 
Causa Incidente 772 Ba a Heatrhow

E' uscita una relazione della probabile causa che ha fatto perdere potenza in corto finale ad entrambi i motori del 772 della Ba caduto in testata 27L a Heathrow. La causa sarebbe la formazione di ghiaccio nei condotti del carburante, formatosi probabilmente x un prolungato basso flusso ad alta quota.

Fuel Icing Likely Culprit of 777 Crash at Heathrow
The UK’s Air Accidents Investigation Branch (AAIB) today issued an interim report for the January 17 accident involving a British Airways Boeing 777 that landed short of Runway 27L at London Heathrow Airport. According to the NTSB, which cooperated in the accident investigation, “Both engines lost power in the final minute of flight because the fuel flow to each engine was restricted, most probably due to an accumulation of ice within the engine fuel feed system. The ice is likely to have formed from water–which exists naturally in the fuel–while the aircraft operated for a long period, with low fuel flows, in the cold environment associated with high-altitude flight.” While the AAIB issued interim recommendations specific to the Boeing 777 and its Rolls-Royce Trent 800 engine “to reduce the risk of ice formed from water in aviation turbine fuel causing a restriction in the fuel feed system,” the agency also released two broader recommendations for all jets. The AAIB asked both the FAA and European Aviation Safety Agency (EASA) to consider the implications of the findings of this investigation on other certified airframe/engine combinations, as well as review the current certification requirements to ensure that aircraft and engine fuel systems are tolerant to the potential build-up and sudden release of ice in the fuel system.
 
Ultima modifica:
approfitto del post perchè ho letto da un altro forum che a quanto pare l'incidente di Madrid sia stato causato dalla non estensione dei flap e che non ci sia stata nessuna esplosione e incendio del motore. A quanto pare però il sistema elettrico non ha segnalato la non apertura dei flap...
qualcuno ha altre notizie al riguardo?
 
Praticamente l'aereo ha volato per un tempo prolungato a temperature molto basse? In genere si considera una caduta di temperatura di 7 gradi centigradi per ora all'interno della stiva. E' lo stesso anche per i serbatoi? Se così fosse, significa che l'esposizione è stata prolungata e già quando l'aereo era a basse temperature.
 
http://www.corriere.it/notizie-ulti...usato-ghiaccio/09-02-2010/1-A_000081431.shtml

LONDRA - Fu il ghiaccio a causare l'uscita di pista, a Heathrow nel gennaio 2008, di un boeing della British Airways. E' questo l'esito ufficiale dell'inchiesta. Nell'incidente rimasero ferite una decina di persone. L'acqua normalmente presente nel combustibile ostrui' i condotti di distribuzione causando una perdita di potenza del velivolo. (RCD)
 
billy13 ha detto:
http://www.corriere.it/notizie-ulti...usato-ghiaccio/09-02-2010/1-A_000081431.shtml

LONDRA - Fu il ghiaccio a causare l'uscita di pista, a Heathrow nel gennaio 2008, di un boeing della British Airways. E' questo l'esito ufficiale dell'inchiesta. Nell'incidente rimasero ferite una decina di persone. L'acqua normalmente presente nel combustibile ostrui' i condotti di distribuzione causando una perdita di potenza del velivolo. (RCD)
Clicca per espandere...

peccato non sia uscito di pista, manco c'è entrato :)
 
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