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JOHN QUIMBY replied to the topic 'Cowl Flap Bushing?' in the forum. 2 hours 40 minutes ago

Steve - thanks found it on various online sites thanks to your help. Ended up finding it on Cessna Direct for $29 vs. Spruce for $39. cessnadirect.com/product-search/?brand=all&query=J14290-4 The only strange thing is they put hold on your credit card for $100 until they determine shipping, seems a bit old school. Thanks for the help.

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JOHN QUIMBY thanked STEVE ELLS in topic Cowl Flap Bushing? 2 hours 51 minutes ago
STEVE ELLS replied to the topic '78 182RG Gear Fault' in the forum. 21 hours 30 minutes ago

Hi Nick;
As I re read your post, I realized I missed some things you wrote. Such as, the reservoir was full.
When I read "I first heard then saw the ammeter cyclically pegging to the left," I wondered if the there might be a problem with a high electrical load on the charging system, which could cause the cycling ammeter needle. But that seems pretty remote especially since modern avionics don't require much electrical power. One thing that we have seen over the years sometimes is missed is a failed diode in the alternator rectifier bridge. Alternators generate alternating current and the rectifier bridge turns that AC into useable DC. If one of the diodes fails, the system will still charge and still supply power but the out put will be reduced. So under normal conditions, the output is sufficient, but under heavy loads (such as the gear motor operation) system needs may overcome system capability. One simple way to diagnose the failed diode is the presence of a high pitched whine in your headsets that varies in pitch with different power settings.
If your mechanic has a multi meter that shows sine waves, a failed diode will present a distinctive pattern on the buss voltage.
Another alternator system glitch is a high electrical resistance in the "alt" half of the master switch. This causes a twitching in the ammeter needle. That's very easy to check--simple take the switch out of the circuit temporarily to see if the twitch disappears.
Please let me know what you find.

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STEVE ELLS replied to the topic '78 182RG Gear Fault' in the forum. yesterday

Hi Nick;
You have a nice airplane; as you may know the hydraulic fluid pressure is supplied by an electrical motor that is turned on (at about 1000 psi) and off (at about 1500 psi) by a pressure switch that's part of the power pack assembly. Three things could cause the motor to continue to run: 1) the pump may no longer be unable to build up 1500 psi (unlikely but possible); 2) the reservoir fluid level may be low; 3) the pressure switch may have gotten stuck (there are directions in the service manual on how to remove, clean, adjust and re install); 4) one of the actuating cylinders for one of the gear legs may be leaking from the pressure side to the return side past an o ring on the actuating piston, thereby creating a leak that prevents the system pressure from reaching the shut off pressure of 1500 psi.

I have attached a service bulletin that calls for an inspection of the wiring and the diode on the pump motor. Check that out.

If you need more information, please don't hesitate to add to your post here.
Steve

File Attachment:

File Name: SEL29-01ArcingHydPowerPk.pdf
File Size: 88 KB


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