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Gear Trouble
Only a set of nose gear doors on the 182RG, but I remember switches in the
main gear wells and your description matches my faulty memory. I've got a POH at home, but I'm wondering if it's too separate problems, one with the gear up limit switch(s) and one with the throttle gear/horn switch. Jim "Mortimer Schnerd, RN" mschnerdatcarolina.rr.com wrote in message ... Jim Burns wrote: You're right.... she's a keeper! Great story... I can't remember too much about the electrical/gear system on the 182RG we used to fly... does the gear down limit switch turn off the pump? if that switch is out of position or bad and the pump continues to run, is there an over pressure bypass? wondering why the amp meter was pegged... stuck bypass valve? where is the throttle/gear horn switch? Glad you made it down ok and saved that new prop! I've got a manual for the 1977 C-210, which is closely related to the C-182RG. Assuming it shares the same clamshell gear doors, there's a pressure switch in the door closing mechanism which shuts off the hydraulic pump. The hydraulic pump is electrically operated. If the pump continues to run, you are cautioned to pull the hydraulic pump circuit breaker. I assume that wasn't done, which is why the ammeter was showing a discharge... the pump was still energized. -- Mortimer Schnerd, RN mschnerdatcarolina.rr.com |
#2
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Gear Trouble
On May 28, 10:59 am, "Jim Burns" wrote:
Only a set of nose gear doors on the 182RG, but I remember switches in the main gear wells and your description matches my faulty memory. I've got a POH at home, but I'm wondering if it's too separate problems, one with the gear up limit switch(s) and one with the throttle gear/horn switch. Jim "Mortimer Schnerd, RN" mschnerdatcarolina.rr.com wrote in messagenews:KaadnW9IWMkoFqDVnZ2dnUVZ_sDinZ2d@gigan ews.com... Jim Burns wrote: You're right.... she's a keeper! Great story... I can't remember too much about the electrical/gear system on the 182RG we used to fly... does the gear down limit switch turn off the pump? if that switch is out of position or bad and the pump continues to run, is there an over pressure bypass? wondering why the amp meter was pegged... stuck bypass valve? where is the throttle/gear horn switch? Glad you made it down ok and saved that new prop! I've got a manual for the 1977 C-210, which is closely related to the C-182RG. Assuming it shares the same clamshell gear doors, there's a pressure switch in the door closing mechanism which shuts off the hydraulic pump. The hydraulic pump is electrically operated. If the pump continues to run, you are cautioned to pull the hydraulic pump circuit breaker. I assume that wasn't done, which is why the ammeter was showing a discharge... the pump was still energized. -- Mortimer Schnerd, RN mschnerdatcarolina.rr.com The 182RG (R182) should be similar to the 177RG. We have the R182, and the pump has a pressure switch that shuts off around 1600 psi. There are two relief valves in the system, one that relieves the electric pump at 1800 psi and the one that relieves the manual pump at 2200. Both valves and the pressure switch are supposed to get checked at the 100-hour inspections, as does the gear swing ("Five fault-free cycles," as Cessna puts it). This requires jacking the airplane to a ridiculous and scary height, so a lot of mechanics won't do it. The gear warning horn has two switches: One in the flap mechanism and the other on the carb, operated by a cam on the throttle shaft. The horn will sound if the throttle is reduced below a certain point or if the flaps are lowered below 23 degrees. The flap switch will make sure the horn sounds even if the throttle is in all the way. The green light system is wired to stop the horn when it fires. (Or you could turn off the master.) The gear-down light is operated by three microswitches, one for each leg, wired in series. The yellow gear-up light is wired to three others. The gear-down switch on the nosegear is actuated by the downlock mechanism, and so the nosegear must be down and locked for the circuit to close. The mains don't absolutely have to be locked for their switches to close, since they're not going anywhere after weight is on them anyway. The OP's complaint, as I think about it, is probably due to the nosegear's switch not closing because the hydraulic cylinder wasn't pulling hard enough to yank the lock into place. It wasn't pulling hard enough because it is bypassing fluid internally, making the system pressure low and keeping the pump running. The hydraulic systems is supposed to be overhauled every five years to replace the rubber bits that do this, but guess how many of them are within THAT limit? There's another R182 on the field here that has had that same bypassing problem. Fixed, now. So, as I see it, that OP's nosegear downlock was not locked (and its switch not closed) until the vibration of the wheel touching down shook the hydraulics a bit and made the piston seal finally catch and bring the pressure up, pulling the lock into place. He is SO lucky, especially considering that he flew the thing home again with no guarantee that the system would hold pressure to keep that lock from jumping out. And that's why the Regs require grounding an airplane when a defect is present. Dan There's a squat switch on the nosewheel scissors that prevents pump operation if the leg is extended. |
#3
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Gear Trouble
Thanks! That's what I was hoping somebody would post! BTW, my incorrect
usage of "182RG" was intentional. Most people do not know that the airplane is truly designated the R182. Jim wrote in message ... On May 28, 10:59 am, "Jim Burns" wrote: Only a set of nose gear doors on the 182RG, but I remember switches in the main gear wells and your description matches my faulty memory. I've got a POH at home, but I'm wondering if it's too separate problems, one with the gear up limit switch(s) and one with the throttle gear/horn switch. Jim "Mortimer Schnerd, RN" mschnerdatcarolina.rr.com wrote in messagenews:KaadnW9IWMkoFqDVnZ2dnUVZ_sDinZ2d@gigan ews.com... Jim Burns wrote: You're right.... she's a keeper! Great story... I can't remember too much about the electrical/gear system on the 182RG we used to fly... does the gear down limit switch turn off the pump? if that switch is out of position or bad and the pump continues to run, is there an over pressure bypass? wondering why the amp meter was pegged... stuck bypass valve? where is the throttle/gear horn switch? Glad you made it down ok and saved that new prop! I've got a manual for the 1977 C-210, which is closely related to the C-182RG. Assuming it shares the same clamshell gear doors, there's a pressure switch in the door closing mechanism which shuts off the hydraulic pump. The hydraulic pump is electrically operated. If the pump continues to run, you are cautioned to pull the hydraulic pump circuit breaker. I assume that wasn't done, which is why the ammeter was showing a discharge... the pump was still energized. -- Mortimer Schnerd, RN mschnerdatcarolina.rr.com The 182RG (R182) should be similar to the 177RG. We have the R182, and the pump has a pressure switch that shuts off around 1600 psi. There are two relief valves in the system, one that relieves the electric pump at 1800 psi and the one that relieves the manual pump at 2200. Both valves and the pressure switch are supposed to get checked at the 100-hour inspections, as does the gear swing ("Five fault-free cycles," as Cessna puts it). This requires jacking the airplane to a ridiculous and scary height, so a lot of mechanics won't do it. The gear warning horn has two switches: One in the flap mechanism and the other on the carb, operated by a cam on the throttle shaft. The horn will sound if the throttle is reduced below a certain point or if the flaps are lowered below 23 degrees. The flap switch will make sure the horn sounds even if the throttle is in all the way. The green light system is wired to stop the horn when it fires. (Or you could turn off the master.) The gear-down light is operated by three microswitches, one for each leg, wired in series. The yellow gear-up light is wired to three others. The gear-down switch on the nosegear is actuated by the downlock mechanism, and so the nosegear must be down and locked for the circuit to close. The mains don't absolutely have to be locked for their switches to close, since they're not going anywhere after weight is on them anyway. The OP's complaint, as I think about it, is probably due to the nosegear's switch not closing because the hydraulic cylinder wasn't pulling hard enough to yank the lock into place. It wasn't pulling hard enough because it is bypassing fluid internally, making the system pressure low and keeping the pump running. The hydraulic systems is supposed to be overhauled every five years to replace the rubber bits that do this, but guess how many of them are within THAT limit? There's another R182 on the field here that has had that same bypassing problem. Fixed, now. So, as I see it, that OP's nosegear downlock was not locked (and its switch not closed) until the vibration of the wheel touching down shook the hydraulics a bit and made the piston seal finally catch and bring the pressure up, pulling the lock into place. He is SO lucky, especially considering that he flew the thing home again with no guarantee that the system would hold pressure to keep that lock from jumping out. And that's why the Regs require grounding an airplane when a defect is present. Dan There's a squat switch on the nosewheel scissors that prevents pump operation if the leg is extended. |
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Gear Trouble
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#5
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Gear Trouble
On May 28, 3:06 pm, Scott Skylane wrote:
wrote: /snip/ There's a squat switch on the nosewheel scissors that prevents pump operation if the leg is extended. Compressed? Happy Flying! Scott Skylane Right. Compressed. If it's extended the switch is closed and the pump will run. Those oleos can be a little sticky, and the R182's gear is a little more forward so the load on the nosegear is low, and the leg might be extended all the way during a normal rollout. Grabing the the gear lever instead of the flaps right after landing is a common mistake, and the pump sucks the nosegear up. Mains too, on low-wing airplanes. Expensive oops. That's why we have a rule here that the flaps are left alone until the airplane is stopped. Dan |
#6
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Gear Trouble
Unbelievable.
The 182RG (R182) should be similar to the 177RG. We have the R182, and the pump has a pressure switch that shuts off around 1600 psi. There are two relief valves in the system, one that relieves the electric pump at 1800 psi and the one that relieves the manual pump at 2200. Both valves and the pressure switch are supposed to get checked at the 100-hour inspections, as does the gear swing ("Five fault-free cycles," as Cessna puts it). This requires jacking the airplane to a ridiculous and scary height, so a lot of mechanics won't do it. The gear warning horn has two switches: One in the flap mechanism and the other on the carb, operated by a cam on the throttle shaft. The horn will sound if the throttle is reduced below a certain point or if the flaps are lowered below 23 degrees. The flap switch will make sure the horn sounds even if the throttle is in all the way. The green light system is wired to stop the horn when it fires. (Or you could turn off the master.) The gear-down light is operated by three microswitches, one for each leg, wired in series. The yellow gear-up light is wired to three others. The gear-down switch on the nosegear is actuated by the downlock mechanism, and so the nosegear must be down and locked for the circuit to close. The mains don't absolutely have to be locked for their switches to close, since they're not going anywhere after weight is on them anyway. The OP's complaint, as I think about it, is probably due to the nosegear's switch not closing because the hydraulic cylinder wasn't pulling hard enough to yank the lock into place. It wasn't pulling hard enough because it is bypassing fluid internally, making the system pressure low and keeping the pump running. The hydraulic systems is supposed to be overhauled every five years to replace the rubber bits that do this, but guess how many of them are within THAT limit? There's another R182 on the field here that has had that same bypassing problem. Fixed, now. So, as I see it, that OP's nosegear downlock was not locked (and its switch not closed) until the vibration of the wheel touching down shook the hydraulics a bit and made the piston seal finally catch and bring the pressure up, pulling the lock into place. He is SO lucky, especially considering that he flew the thing home again with no guarantee that the system would hold pressure to keep that lock from jumping out. And that's why the Regs require grounding an airplane when a defect is present. Dan There's a squat switch on the nosewheel scissors that prevents pump operation if the leg is extended. |
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