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.