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#1
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Two recent incidents
Sorry if this is boring, but the last discussion pretty much focused
on the release / rudder waggle. I can't get to the NTSB report just now, but I seem to recall reading in the report on the OTHER incident (loose hand held radio blocking forward stick movement) that the pilot released, still couldn't get the nose down, then tried adding down trim to bring it down. If the glider being flown at the time had a spring trimmer, nothing will be gained by moving the trim. If the glider had a tab on the elevator, pushing down trim effectively adds more UP elevator. I often fly a Grob Twin Astir, and have played with the trim quite a lot. Very useful in steep turns with a fat guy (me) in the front seat. The trim tab has a surprising amount of pitch authority. Spoilers might also be a way to get the nose down, but I would hesitate to open them while the nose was in the process of approaching stall attitude. I read the NTSB reports because it makes me think about contingencies: "what could/should/would I do if....." I learned last summer that I won't think of something new while experiencing a non-standard (hairy) situation, so playing 'what it' is very useful to me. |
#2
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Two recent incidents
Uncle Fuzzy wrote:
Sorry if this is boring, Snip... I read the NTSB reports because it makes me think about contingencies: "what could/should/would I do if....." I learned last summer that I won't think of something new while experiencing a non-standard (hairy) situation, so playing 'what if' is very useful to me. There *may* be pilots around who think 'originally and well' under new & stressful/hairy situations...but I've never encountered/heard/read of one, yet. Regards, Bob - seeks to be mentally 'semper paratus' - W. |
#3
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Two recent incidents
You will have the similar limitation. Once the elevator hits the stop(obstruction) moving the trim tap further has no effect if anything it will be reversed as the trim tab now acts alone and is in a down deflection.(in case of a nose up trim) Udo At 19:35 08 September 2008, Uncle Fuzzy wrote: Sorry if this is boring, but the last discussion pretty much focused on the release / rudder waggle. I can't get to the NTSB report just now, but I seem to recall reading in the report on the OTHER incident (loose hand held radio blocking forward stick movement) that the pilot released, still couldn't get the nose down, then tried adding down trim to bring it down. If the glider being flown at the time had a spring trimmer, nothing will be gained by moving the trim. If the glider had a tab on the elevator, pushing down trim effectively adds more UP elevator. I often fly a Grob Twin Astir, and have played with the trim quite a lot. Very useful in steep turns with a fat guy (me) in the front seat. The trim tab has a surprising amount of pitch authority. Spoilers might also be a way to get the nose down, but I would hesitate to open them while the nose was in the process of approaching stall attitude. I read the NTSB reports because it makes me think about contingencies: "what could/should/would I do if....." I learned last summer that I won't think of something new while experiencing a non-standard (hairy) situation, so playing 'what it' is very useful to me. |
#4
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Two recent incidents
You will have the similar limitation. Once the elevator hits the stop(obstruction) moving the trim tap further has no effect if anything it will be reversed as the trim tab now acts alone and is in a down deflection.(in case of a nose up trim) Udo At 19:35 08 September 2008, Uncle Fuzzy wrote: Sorry if this is boring, but the last discussion pretty much focused on the release / rudder waggle. I can't get to the NTSB report just now, but I seem to recall reading in the report on the OTHER incident (loose hand held radio blocking forward stick movement) that the pilot released, still couldn't get the nose down, then tried adding down trim to bring it down. If the glider being flown at the time had a spring trimmer, nothing will be gained by moving the trim. If the glider had a tab on the elevator, pushing down trim effectively adds more UP elevator. I often fly a Grob Twin Astir, and have played with the trim quite a lot. Very useful in steep turns with a fat guy (me) in the front seat. The trim tab has a surprising amount of pitch authority. Spoilers might also be a way to get the nose down, but I would hesitate to open them while the nose was in the process of approaching stall attitude. I read the NTSB reports because it makes me think about contingencies: "what could/should/would I do if....." I learned last summer that I won't think of something new while experiencing a non-standard (hairy) situation, so playing 'what it' is very useful to me. |
#5
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Two recent incidents
There was a story, for which I don't have a citation, about a checkride in a
piston airliner in the early 1950's. This shows that trim tab antics go way back. I heard the story from one of the participants. After settling in at cruise altitude, the check airman in the jump seat decided to engage the control locks to, "see what the pilots would do". As it happened, the control locks introduced a slight nose up elevator input. The pilots started rolling in nose down trim to counteract the nose up trend but, of course, this just made it worse. As the trim tabs reached their nose down limits, the check airman decided his little 'joke' had gone far enough and released the control locks. The airplane now was configured with full nose down trim at cruise power causing it to enter a screaming dive. Only the captain was wearing his seatbelt so everyone else got intimate with the overhead cockpits panels. The captain saved the aircraft, albeit with structural damage, so the check airman lived to explain his actions to his supervisors. Bill D "Udo Rumpf" wrote in message ... You will have the similar limitation. Once the elevator hits the stop(obstruction) moving the trim tap further has no effect if anything it will be reversed as the trim tab now acts alone and is in a down deflection.(in case of a nose up trim) Udo At 19:35 08 September 2008, Uncle Fuzzy wrote: Sorry if this is boring, but the last discussion pretty much focused on the release / rudder waggle. I can't get to the NTSB report just now, but I seem to recall reading in the report on the OTHER incident (loose hand held radio blocking forward stick movement) that the pilot released, still couldn't get the nose down, then tried adding down trim to bring it down. If the glider being flown at the time had a spring trimmer, nothing will be gained by moving the trim. If the glider had a tab on the elevator, pushing down trim effectively adds more UP elevator. I often fly a Grob Twin Astir, and have played with the trim quite a lot. Very useful in steep turns with a fat guy (me) in the front seat. The trim tab has a surprising amount of pitch authority. Spoilers might also be a way to get the nose down, but I would hesitate to open them while the nose was in the process of approaching stall attitude. I read the NTSB reports because it makes me think about contingencies: "what could/should/would I do if....." I learned last summer that I won't think of something new while experiencing a non-standard (hairy) situation, so playing 'what it' is very useful to me. |
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