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#1
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AUTOPILOT AWRY
Thanks for the help!!
I am going to do some detective work and will report back. Bill Snow "William Snow" wrote in message ... I have a piper Arrow and out of the blue...(no pun intended)... the Autopilot banked hard left (30 deg.) for no apparent reason. It was on Hdg Mode and the bug was centered. Each time it was shut off and re-engaged it continued to bank hard left. I have a long trip to FL planned over the school break and sure would like to have the Autopilot working. Does anyone know why this would happen? Thank You All. Bill Snow |
#2
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AUTOPILOT AWRY
Looking forward to your findings Bill. Reason being, the Autocontrol
III in our Arrow only works in heading bug mode. I'm interested to know how much time/money you wind up putting into your repair. It would be nice to have ours work in all modes but I'm not so sure I'd want to spend more than a couple tenths of an AMU on it. -- Jack Allison PP-ASEL-IA Student Arrow N2104T "When once you have tasted flight, you will forever walk the Earth with your eyes turned skyward, for there you have been, and there you will always long to return" - Leonardo Da Vinci (Remove the obvious from address to reply via e-mail) |
#3
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AUTOPILOT AWRY
On 02/18/06 13:58, Jack Allison wrote:
Looking forward to your findings Bill. Reason being, the Autocontrol III in our Arrow only works in heading bug mode. I'm interested to know how much time/money you wind up putting into your repair. It would be nice to have ours work in all modes but I'm not so sure I'd want to spend more than a couple tenths of an AMU on it. Sheesh - can you even get a tire changed for that much? .... by the way, it costs me nuthin' to get a tire changed ;-) On the other hand, the mixture control is bottoming out against the firewall and the maintenance folks believe this is working correctly ;-\ -- Mark Hansen, PP-ASEL, Instrument Airplane Cal Aggie Flying Farmers Sacramento, CA |
#4
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AUTOPILOT AWRY
Mark Hansen wrote:
Sheesh - can you even get a tire changed for that much? Dunno...but will find out soon as the nose wheel is due. Stay tuned. ... by the way, it costs me nuthin' to get a tire changed ;-) Hehe...ya, and you don't need to wipe bugs off the plane after each flight either. OTOH, I can be a hangar rat whenever I want. :-) On the other hand, the mixture control is bottoming out against the firewall and the maintenance folks believe this is working correctly ;-\ Hmmm, I like our maintenance program better, even if we can't get a tire changed for free :-) -- Jack Allison PP-ASEL-IA Student Arrow N2104T "When once you have tasted flight, you will forever walk the Earth with your eyes turned skyward, for there you have been, and there you will always long to return" - Leonardo Da Vinci (Remove the obvious from address to reply via e-mail) |
#5
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AUTOPILOT AWRY
On 02/18/06 16:51, Jack Allison wrote:
Mark Hansen wrote: Sheesh - can you even get a tire changed for that much? Dunno...but will find out soon as the nose wheel is due. Stay tuned. ... by the way, it costs me nuthin' to get a tire changed ;-) Hehe...ya, and you don't need to wipe bugs off the plane after each flight either. OTOH, I can be a hangar rat whenever I want. :-) Oh, it's true, it's true ... I have no hangar On the other hand, the mixture control is bottoming out against the firewall and the maintenance folks believe this is working correctly ;-\ Hmmm, I like our maintenance program better, even if we can't get a tire changed for free :-) I can't argue with that. -- Mark Hansen, PP-ASEL, Instrument Airplane Cal Aggie Flying Farmers Sacramento, CA |
#6
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AUTOPILOT AWRY
Jack Allison wrote: Looking forward to your findings Bill. Reason being, the Autocontrol III in our Arrow only works in heading bug mode. Are you saying it doesn't work in ROLL mode, but does work in HDG mode? Unusual, but if so then it's a pretty simple fix. The HDG switch essentially disables the ROLL pot, so if it works okay in HDG but not in ROLL, then either the switch is bad, or the POT is bad, not much else involved. |
#7
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AUTOPILOT AWRY
jmk wrote:
Are you saying it doesn't work in ROLL mode, but does work in HDG mode? Unusual, but if so then it's a pretty simple fix. The HDG switch essentially disables the ROLL pot, so if it works okay in HDG but not in ROLL, then either the switch is bad, or the POT is bad, not much else involved. Sorry, I should have clarified. Heading mode works, roll works (sort of, I'll explain in a sec.). It is the other modes (NAV, OMNI, LOC, LOC back course) that don't work. For roll mode, if I turn the round roll knob slightly one direction, the ailerons keep moving to the stops. If the knob is centered though, the ailerons stay centered. I've only tried this on the ground. In the air, heading mode works fine but none of the other modes mentioned above. -- Jack Allison PP-ASEL-IA Student Arrow N2104T "When once you have tasted flight, you will forever walk the Earth with your eyes turned skyward, for there you have been, and there you will always long to return" - Leonardo Da Vinci (Remove the obvious from address to reply via e-mail) |
#8
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AUTOPILOT AWRY
I thought that is the way it is supposed to work on the ground. I thought,
and I might be wrong on this, that the roll pot set a desired angle of bank, not a desired aileron position. Next time I have some time, I will check this out. Just another data point for consideration: My auto pilot was not working right on my arrow when I bought it ( or should I say it always worked "right"). It would turn to the right in VOR/LOC modes. I had the shop look at it along with other items on my squawk list. They fixed it with no parts and about an hour of labor. I don't know what the problem was. Just goes to show you that autopilots are not always expensive to get fixed. It is definitely worth having someone look at it. "Jack Allison" wrote in message ... jmk wrote: Are you saying it doesn't work in ROLL mode, but does work in HDG mode? Unusual, but if so then it's a pretty simple fix. The HDG switch essentially disables the ROLL pot, so if it works okay in HDG but not in ROLL, then either the switch is bad, or the POT is bad, not much else involved. Sorry, I should have clarified. Heading mode works, roll works (sort of, I'll explain in a sec.). It is the other modes (NAV, OMNI, LOC, LOC back course) that don't work. For roll mode, if I turn the round roll knob slightly one direction, the ailerons keep moving to the stops. If the knob is centered though, the ailerons stay centered. I've only tried this on the ground. In the air, heading mode works fine but none of the other modes mentioned above. -- Jack Allison PP-ASEL-IA Student Arrow N2104T "When once you have tasted flight, you will forever walk the Earth with your eyes turned skyward, for there you have been, and there you will always long to return" - Leonardo Da Vinci (Remove the obvious from address to reply via e-mail) |
#9
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AUTOPILOT AWRY
Jack Allison wrote:
jmk wrote: Are you saying it doesn't work in ROLL mode, but does work in HDG mode? Unusual, but if so then it's a pretty simple fix. The HDG switch essentially disables the ROLL pot, so if it works okay in HDG but not in ROLL, then either the switch is bad, or the POT is bad, not much else involved. Sorry, I should have clarified. Heading mode works, roll works (sort of, I'll explain in a sec.). It is the other modes (NAV, OMNI, LOC, LOC back course) that don't work. For roll mode, if I turn the round roll knob slightly one direction, the ailerons keep moving to the stops. If the knob is centered though, the ailerons stay centered. I've only tried this on the ground. In the air, heading mode works fine but none of the other modes mentioned above. That's OK - the autopilot rolls till the roll feedback from the horizon gyro matches the request from the pot. You're ordering a certain amount of roll. If the horizon does not follow, turn more on the ailerons till the order is fulfilled. -- Tauno Voipio (CPL(A) - avionics engineer) tauno voipio (at) iki fi |
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