Date: 24 Oct 97 04:33:13 From: email@example.com (Malcolm Weir) Organization: Little to None References: 1 2 3 4
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On 16 Oct 97 11:59:51 , Chuanga@cris.com (H Andrew Chuang) caused to appear as if it was written: >> Essentially, the T800 failure was definitely not catastrophic! > >I don't know for a fact that it was catastrophic. I was merely repeating >what I had heard from two different sources that it was a catastrophic >failure. For the second time, Flight International reported the >incidence as catastrophic and cited the failure was due to a high >compressor blade fatigue. If you have evidence that the FI report was >inaccurate, perhaps you should say so to FI. Here's the relevant stuff from Flight International, 24-30 Sep (Pg. 7) EMIRATE 777 Trent engine fails during take-off A Trent 800 engine from an Emirates Airlines Boeing 777, which suffered a catastrophic engine failure during take-off is being examined by Rolls-Royce. The take-off was continued and the crew shut down the engine and returned to Dubai, where the aircraft was landed safely. Emirates declines to comment, beyond saying that there was an incident involving the flight to Male in the Maldives and that the aircraft returned to Dubai. Unconfirmed reports from pilots in Dubai say that a failure and subsequent engine fire occurred after V1 (take-off decision speed), but before rotation speed. The shutdown on 16 September is reported to have resulted in a failure in the high-pressure compressor. It is possible that the incident was prompted by a birdstrike, although one source says that metal debris in the mass chip-detector is believed to have come from the front-bearing cage. R-R says only that "...there was an in-flight shutdown on an Emirates aircraft. The engine is being stripped down and we are investigating." Preliminary indications were that the aircraft's thrust-asymmetry compensation (TAC) function also failed to operate. The TAX automatically applies up to 10degress rudder when one engine produces greater than 10% more power than the other, but only under set conditions. When the engine failed, the Emirates' 777 engine-indication and crew-alerting system displayed the advice "THRUST ASYM COMP". The 777's operations manual explains this as: "Thrust asymmetry compensation is inoperative". Boeing says: "It looks as if the TAC operated as it should have. Certain failures will not activate the TAC function, to ensure that there is no [rudder] input in the wrong direction.". Malc.