bigD
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- Jan 29, 2002
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AA717driver said:Yes, it's designed that way. Now EVERYONE knows we "G-unit" pilots are "packin' large". (cue the '50 Cent' track)![]()
TC
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AA717driver said:Yes, it's designed that way. Now EVERYONE knows we "G-unit" pilots are "packin' large". (cue the '50 Cent' track)![]()
TC
Where did everybody get the idea that the FCS cause the problem? The autopilot did disengage. The PF was pulling on the thing hard enough to get it to disconnect, and when it let go, he was pulling at the disconnect threshold (30 lbs?) PIO's are what hurt and killed those people (on both airplanes), not anything the autopilot did. Had either pilot just let go of the controls, the problem would have vanished.GEXDriver said:I think GV's point was that if the Greek pilot or the Amway pilot had tried to overcome the autopilot on the Gulfstream it would have just disengaged rather than sending the aircraft through violent pitch oscillations.
gern_blanston said:Where did everybody get the idea that the FCS cause the problem? The autopilot did disengage. The PF was pulling on the thing hard enough to get it to disconnect, and when it let go, he was pulling at the disconnect threshold (30 lbs?) PIO's are what hurt and killed those people (on both airplanes), not anything the autopilot did. Had either pilot just let go of the controls, the problem would have vanished.
Under-trained copilots are bad news on any airplane.
I've never flown a G-anything or a Global, but I do know that the Falcons fly beautifully. Very light and responsive on the controls, and very confidence inspiring at pattern speeds, turbulence or no.
As for the Arthur unit, our Falcon 2000's failed once in the 'low-speed' (sensitive) position right after takeoff, and as we were on a short flight, I hand-flew the remainder of the mission. I could barely tell the difference. there's not much change between max and minumum sensitivity.
gern_blanston said:Interesting version of the story. That may not be exactly what happened, and it's certainly not an 'accident report.' It's one guy's opinion, and the operator's definitely trying to CYA since there were 7 fatalities.
Here's a version that google found for me as told by 'Aviation Safety Network'.
Falcon 900B SX-ECH was owned by the Greek Air Force and operated by Olympic Airways. A Greek government delegation, a.o. minister in charge of European affairs, Yiannos Kranidiotis, were to visit Bucharest. Their plane departed Athens 18:16 UTC. During climb, after the flaps and slats were retracted, the flight crew noticed, on the warning panel, the "PITCH FEEL" light, was illuminated. The captain disengaged the autopilot, checked the forces on the control column and re-engaged the autopilot. The "PITCH FEEL" warning light, remained continuously ON, during cruise and descent until the slats were extended. The Falcon reached a cruising altitude of FL400 until 47 minutes from take-off, when a normal descent to FL150 was initiated, with the autopilot
engaged in vertical speed (V/S) mode. During descent the Indicated Air Speed (IAS) increased from 240 knots to 332 knots. Approaching FL150, the first officer had a request for a further descent. Just before FL150 the ATC recleared the flight to continue descent to FL50. One second later autopilot disengaged and
thereafter the aircraft was manually flown by the captain. Between FL150 and FL140, for approximately 24 seconds, the aircraft experienced 10 oscillations in pitch axis which exceeded the limit manoeuvring load factor. Maximum recorded values were: +4.7 g and -3:26 g. During the event the thrust power was reduced. At about FL130, after aircraft recovery from the encountered oscillations, the first officer declared an emergency, saying: "We are in emergency sir, request vector to final approach. We have problems with the controls". At the request of the flight crew, radar vectoring was provided by the ATC, and a
visual approach and landing was performed on runway 08R. It appeared that the cabin interior had been completely destroyed, resulting in fatal injuries to seven passengers.
CAUSAL FACTORS:
1. Inadequate risk assessments of the PITCH FEEL malfunctions.
2. Overriding of the A/P on the pitch channel by the crew.
3. Inappropriate inputs on the control column at high speed and with Arthur unit failed in 'low-speed' mode leading to Pilot Induced Oscillations.
4. Seat-belts not fastened during descent flight phase.
...
2000flyer said:...the Greek accident you talk about. That one, as well, was pilot error as they should have known that putting pressure on the yoke will cause the trim to change. The pilot was trying to "assist" the AP and when he "let go" of the yoke it ended up in a negative G maneuver that tossed the passengers around.
Both of these posts are just flat wrong. The AQ unit failed in the low speed mode, as has been pointed out already, so saying it had nothing to do with "arthur" is just plain incorrect.G100driver said:The Arthur had nothing to do with the accident. The pilot, a former Boeing, guy was confused on which airplane he was flying. He was holding down on the pitch sync button while applying forward pressure on the yoke. He though he as disengaging the AP with in reality he was fighting it. When he let go of the yoke the airplane took him and his pax for a ride.
Nothing to do with Aurther.
gern_blanston said:Interesting version of the story. That may not be exactly what happened, and it's certainly not an 'accident report.' .
TIS said:This kind of "pilot-proofing" may irritate me to no end, but it also helped kill 7 people. I have a big problem with that.
TIS
2000flyer said:ot error?
to GEX Driver,
I know GV didn't say anything about the G3, thus the reason I specifically stated G3 in my post. So, to make everybody happy, GIV's 4 fatal accidents, Falcon 900EX 1.
2000Flyer
gern_blanston said:Did Amway's plane have an Arthur-Q problem? I can't remember, but I didn't think so. I can't find the NTSB report, but I thought it, too was attributed to pilot error.
Yeah, that's the one. What a bum deal. She ended up losing her arm later to complications, I think. It was the same scenario, without the Q-unit failure. The copilot pulled on the yoke until the autopilot kicked off, and PIO's did the rest. Seems like they were coming through 10,000 feet or so. Well-trained pilots are the key to success, no matter what you're flying.GVFlyer said:The mishap I was referencing occurred on 9 October 1999 in an Amway Falcon 900B which went into severe pitch oscillations while on approach to Kent County Airport at Grand Rapids. The flight had originated at Portland and Beverly, their flight attendant, was permanently disabled whe she was thrown about the cabin.
GV
GEXDriver said:...There was nothing mechanically wrong with this G-IV...
Gee, that's nice. A plane which, if the autopilot is engaged while the pilot tries to prevent it from behaving badly (i.e. trim runaway), develops a problem that may result in fatalities. That's some fine engineering!G100driver said:If the pilot had not grabbed ahold of the yoke while the AP was engauged none of this would have happened.
TIS said:Gee, that's nice. A plane which, if the autopilot is engaged while the pilot tries to prevent it from behaving badly (i.e. trim runaway), develops a problem that may result in fatalities. That's some fine engineering!
That wouldn't happen on a Gulfstream - PERIOD!
But I digress. The AQ unit is there for a reason and it isn't because the engineers thought it would be nice to have along for the flight. It's there to fix something that would prevent certification if not addressed.
It is often stated that Falcons fly really nicely and, not having flown one, I can't really say. However, one of the reasons it flies the way it does is because it has a magic little box that no one seems to understand the construction or function of that prevents pilots from overcontrolling the plane at high speeds. The Greek accident demonstrates that when that little gem goes inop the result is an airplane with unpredictable, or at least masked, control characteristics. Equipment like the AQ unit is there to fix engineering problems pure and simple.
What I know is that though there are countless engineering problems with Gulfstreams (that's what ASCs fix), none of them seem to be potenitally life threatening. So guess what. I prefer the Gulfstream on that basis alone, nevermind the experience of the last ten years of my life.
Zero Compromise. That's what Gulfstream means.
I've seen the advantages of that many, MANY times over the years.
TIS
2000flyer said:GEX,
If tomorrow your (or my) company switched aircraft to a Falcon or Gulfstream, I'd bet you a keg of your favorite beer you'd be more than glad to fly it!
Respectfully,
2000Flyer
GEXDriver said:In addition to the Global we have two Falcon 2000 eASY's and a G-IV. By far, I like the G-IV better than the Falcons. I like it's systems, it's redundancy and rugged reliability, plus, it makes the Falcons seem underpowered. Without experience in both types I don't see how you can validly comment on which one is "better".
TIS said:A plane which, if the autopilot is engaged while the pilot tries to prevent it from behaving badly (i.e. trim runaway), develops a problem that may result in fatalities. That's some fine engineering!
TIS
TIS said:Zero Compromise. That's what Gulfstream means.
TIS
2000flyer said:GEX,
I guess I shouldn't be surprised with such a spirited group of aviators amassed here who are loyal to the products they fly. If tomorrow your (or my) company switched aircraft to a Falcon or Gulfstream, I'd bet you a keg of your favorite beer you'd be more than glad to fly it!
2000Flyer
So if the Gulfstream is descending in V/S mode and you just pull back on the yoke, the autopilot doesn't trim against you or disconnect? Interesting. I learn stuff every day.TIS said:Gee, that's nice. A plane which, if the autopilot is engaged while the pilot tries to prevent it from behaving badly (i.e. trim runaway), develops a problem that may result in fatalities.
Al that little box does is to move the position of the pivot on the artificial-feel unit to vary the amount of spring feedback to the controls an inch or two. Hydraulically in the older planes, electrically in the newer ones. And, again, having flown the '2000 with the Q-unit stuck in the high-sensitivity position, I can tell you that absolutely nothing unpredictable happens. There's just slightly less resistance on the controls. Not evenperceptible if you're hand-flying and you're trying to do a smooth job of it. The light comes on, you get your checklist out, and it tells you that things might be a bit more sensitive than normal. The Gulfstream has artificial feel springs, too, doesn't it?TIS said:... one of the reasons it flies the way it does is because it has a magic little box that no one seems to understand the construction or function of that prevents pilots from overcontrolling the plane at high speeds. The Greek accident demonstrates that when that little gem goes inop the result is an airplane with unpredictable, or at least masked, control characteristics.
GEXDriver said:In addition to the Global we have two Falcon 2000 eASY's and a G-IV. By far, I like the G-IV better than the Falcons. I like it's systems, it's redundancy and rugged reliability, plus, it makes the Falcons seem underpowered. Without experience in both types I don't see how you can validly comment on which one is "better".
The gulfstream total package is far superior and if you had the opportunity to operate both (like i have), then you would get it. but if my boss bought a falcon i would love to fly it and my opinion wouldn't change.2000flyer said:Besides the glib truck comment (go back and re-read the posters reference to a Gulfstream flying like a truck in this thread as well)
G100driver said:That is a laugh. Have you seen the full line of Gulstream products. They are filled with compromises. Just ask the guys who are flying international in the new Gulfstreams that only have 2 AHARS with no IRS. You cannot tell me that they are not Gulfstreams. Do know how I know? The Gulstream salesman tried to sell us one.![]()
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2000flyer said:True, compared to the Gulfstream, I'm sure you feel the Falcon is under powered. I"m sure someone flying an F15 feels the Gulfstream is under powered. Whats your freggin point?
GEXDriver said:My point is that I like flying in the Forties as opposed to flying in the Thirties. I like flying above the North Atlantic Tracks as opposed to being stuck in them. I like being able to top weather and turbulence as opposed to being banged around or having to alter my course by hundreds of miles. I like being able to kick up my speed to M 0.85 or better regardless of altitude if the boss is running late. I like having enough redundancy in systems that if something major breaks in the Third World, I still have enough airplane left to fly it back to the First World to get it fixed. The simple truth is that for a corporate operation like ours the Gulfstream just does every thing better than the Falcon.