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GIV Crash Mystery Focuses on Mechanical Systems

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Accident investigators are focusing on two perplexing clues as they try to determine what caused the deadly crash of Gulfstream IV in Bedford, Massachusetts, on May 31 after the jet failed to lift off from the runway during what should have been a routine takeoff. (www.flyingmag.com) और अधिक...

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bbabis
bbabis 3
No mystery about the flap handle in a different position. You had a crew franticly trying to stop an aircraft, impact forces, and a crew member attempting egress all could have moved the handle in the cockpit. Bottom line, the flaps were in the position the crew wanted for takeoff. The next "mystery" is why Gulfstream would put a mechanical gust lock system on a hydraulic flight control aircraft. They were asking for trouble and now they've got it. A control problem discussion at Vr can only be an inability to move the control yoke or no corresponding action to yoke movement. If the NTSB verifies that trim was in the takeoff range, that would leave only the elevator as the cause. A linkage issue? Gust lock engaged or becoming engaged during takeoff? This one will be solved quickly. The CVR may already reveal the answer.
richsmit
Richard Smith 3
Do you suppose one of the pilots realized at the last second what the problem was (gust lock still in place) and released it just before the crash? He didn't have time to verbalize it, so the correction was not on the CDR.
preacher1
preacher1 1
All this is well and good but the mystery remains that if the Gust Lock was in place and functioning correctly, it should have held them to 6% power if I read it right. That said, they were way above that at V1 and ready to rotate. Something was sour.
jimmurray333
Jim MURRAY 1
I was on duty in the NWA dispatch office around 1960 at MSP when one of our Boeing 377 stratocruisers ditched into Puget Sound right after takeoff. The flight engineer, who had come over from flying Lockheed constellations, had set the cowl flaps in the wrong position, wide open, and the ensuing vibrations caused the pilots to ditch. The FSA (flight service attendant) was in the lower level bar, drowned. He was the only fatality.
onceastudentpilot
tim mitchell 1
Since this "gust lock" was installed on a hydraulic system could this be a metering valve problem?...Seems to me like there wasn't adequate pressure to move the elevator.
nasdisco
Chris B 1
I'm also interested in the effect having that ditch just beyond the perimeter had on this accident. The wheels may have come off before the ditch, but did it create an impact that ruptured the fuel tanks.
davysims
David Sims 2
Airport standards dictate having 1000 safety overruns off the end of most runways, which is sufficient in most cases. However there is always an extreme example, the aircraft in this case stopped 1,850 feet from the runway, and it is unpractical to require even longer long safety overruns.
bbabis
bbabis 1
Ripping the main gear out usually does in the tanks. Plowing through a localizer shack does it also. Plenty of fuel was available for any flame source. The burn path goes back to the localizer shack so fuel was left there or it may have already been on fire at that point. The ditch was incidental and could even have been a positive if it broke the plane in a way allowing escape. Unfortunately, there was no escape and forensics will have to tell us what most likely happened.
linbb
linbb 1
And what would that have to do with the crash? There are many things just beyond the perimeter of many airports, you cannot take hills down or fill ditches. No different than canyons next to roadways.

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