182rg gear retraction

182rg gear retraction

Is it possible to only test the nose gear retraction without jacking the airplane. Can the tail be tied down with nose off ground then gear tested.

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Re: 182rg gear retraction

I maintain 3 of these great airplanes (pushing 30,000 hours combined airframe time) and retracting the Nose gear without the Mains cannot be done as you describe.  I am certain that there is sufficient pressure in that system to pull the mains and drop your craft where she sits. It could probably be done with numerous line disconnections but I think jacking is far safer and easier. These airplanes are a pain to jack because they have to be so high in the air, but it is the only safe way....

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Re: 182rg gear retraction

I have lowered the tail (raise the nose) with weights and then placed the gear handle in the up position with the master off to relieve system pressure. I needed to perform a SB on the nose gear down lock pins. Don't think I would try it with pressure I find it hard to believe that the acutators and pump could over power the weight of the aircraft in an over center sitituation but you never know.

Gary

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Re: 182rg gear retraction

That system operates on 1500 PSI and those Main Gear actuator pistons are over 2 inches in diameter. That is @ 3000 lbs each side or @ 6000 lbs combined...They have no mercy when it comes to pushing that gear.. Why even think about it.. Have you ever seen it in the maintenance book where it tells you set it on its tail and do this to save time?  Is it really worth the chance?  And what if it folds up - Then What? If your short cut proper maintenance procedures, at some point, you will lose. This is one for sure.. If you do attemp it, be sure post how it turns out.. Hey, if it works, I will find me a big fat Crow.

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Re: 182rg gear retraction

Ok Ken, we're talking R182 nose gear retraction, on ground.
Yep,you can safely hold the tail down [best get two grownups to sit on the tailplane spar rivet line] and select gear up electrically.
The nose gear will go up, close doors and the system will shut down. Oh, you should open the throttle to shut the horn off.
The pressure switch in the system  will shut the pump off as it takes a lot more pressure to move the main gear.
Don't let the bums on the tail get up to look, it could be nasty.
When you are finished, just select down and the nose gear will drop and lock.
don't be surprised this happens real quick, 'cause the mains don't move.
Check the down light, and the horn [throttle]
If it were my job i'd put a trestle under the belly, just in case.
And this also works for 210's that have electric pumps.
Cessna training programs actually used to teach this back when R182's had the nose door interference problem [[and if you hav'nt made sure of this then don't land on a sealed runway, its horribly expensive to fix]
I once had a cleaner ask for help, 'cos he'd been listening to the radio and moved the gear selector in a new 210 to clean around it,
when I got to it the a/c was sitting there with the nose gear retracted and the prop firmly in the ground, as luck/stupidity would have it there was no damage, the nose doors hadn't even hit the ground
safe travels HOWARD

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Re: 182rg gear retraction

Howard, do you have a Buletin # for that Interference problem? I reread the Maintenance manual just to be sure and nowhere does it say - sit on the tail with pads under the belly.  One caution about building a bunch of pressure in the pump - it has a shear drive that will shear then you must pull the motor to replace. (fun, plus the shear drives are pricey)If jacking is out of the question, then possible remove the down line on the nose gear actuator.  Then cautiously move the nose up manually. Watch out for the stream of 5606. This is a good site, but I think some information should be taken with a grian of salt.. Sorry, I am done. said my peace and now will shut up...Jack

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Re: 182rg gear retraction

Jack, the SB is SB78-8. I will see if I can dig it out, it is an AD here in Australia, just quickly, if the doors catch on the fixed lower cowl, there is the possibility of the gear not extending, which in turn lets the prop hit the ground, and other bits of a/c also get hurt.
Now the R182 hydraulic system is an electro-hydraulic system and upon gear up selection the gear goes up by an elect. motor driving a hyd pump.
when the gear reaches full up the pump stops, when the system pressure builds to approximately 1500 psi [which is the pressure setting of the pressure switch. These a/c do not have up micros to stop the pump. The micro's simply work the lights.
As the main gear rams cannot overcome the weight of the a/c [and geometry loads] there is no danger of main gear retraction or hyd system damage when you retract the nose gear by holding the tail down.
This method is often used to fault find the throttle /gear warning system.
In fact if you have an a/c on jacks you can stop the pump by preventing any gear movement, which causes the pressure to build to 1500.

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Re: 182rg gear retraction

Howard, Our 182s are 82s and 86. In fact the 86 is the next to the last one ever made.  so that is probably I haven't seen that service Bulletin.

I agree on everything you say about the Pressure and how the pressure switch will reach its limit before the mains retract and drop the plane..
I would do this process, tail down, if I were being shot at and had to do it to save my skin.
But for people out in the field who read this kind of maintenance procedure (shortcut) often end up hurting themselves or their equipment. 
Maintenance, by the book, is pretty safe and reliable and the shortcuts should be left to the people willing to suffer the consciences.
Howard - have you ever performed this retraction procedure? and if you have, why?  No equipment or just taking shortcuts.. Just curious!
Hey, I learn something everday - but I still wouldn't do it.

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Re: 182rg gear retraction

Jack, I only started on this to answer Ken, not to knock anyone or to recommend that it be done. I have performed this operation many times, as a fault finding test for throttle warning, gear door clearance etc. as I said in an earlier post 'put a trestle under the belly' or risk the bums on the tail forgetting why they are there, and don't forget if you do sit on the tail, sit inboard on the spar rivet line as there is also a problem with tailplane spar center section cracking and you wouldn't want to cause that, and pull the elevators up, or they'll hit the ground.
As for a shortcut, I wouldn't do this to avoid jacking for a retraction test.
The R182, 172RG, and doorless 210's [not modded ones] have the best and easiest landing gear retraction system of all the Cessna range, and better than most other retractable GA aircraft.
safe travels.

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Re: 182rg gear retraction

I understand and appreciate the knowledge and feedback from those like you who have been out there doing the job and willing to share their years of work experience with others.  I learned something about the 182RG I never knew before.  I say- Thanks for sharing and lets keep'em flying.. Good day!

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Re: 182rg gear retraction

Sorry Howard,  I posted that last one but your name ended up in the "author" slot. was supposed to be jack.

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