A Maintenance Oriented Podcast For Airplane Owners, Pilots, and Mechanics

Tag: voltageregulator

139 – My Alternator Came Apart… Should I Also Replace the Voltage Regulator?

NOTICE: UNTIL THE END OF MAY 2020, USE CODE “CANARD” FOR A 20% DISCOUNT ON MY VIDEO COURSE “SAFETY WIRE LIKE A PRO!” (Listen to the podcast to hear the story behind the word “canard” and why I chose that for the code.)

Click the following link to learn about the course:

https://airplane-owner-maintenance.teachable.com/p/safetywiring


I received an email recently asking a question about an alternator that came apart due to a failed bearing… listen to today’s podcast episode for some thoughts on that.

Also, many older airplanes don’t have a digital voltage indicator on the instrument panel, so here’s a fantastic solution for plugging in to the cigarette lighter: (and the great thing is, it’s under $20!)

https://www.sportys.com/pilotshop/flight-gear-dual-usb-charger.html


Here are some other items of interest from this past week: (All of these situations are described in today’s episode.)

STRANGE VACUUM GAUGE INDICATIONS IN A MOONEY – CHECK OUT THE DETERIORATED HOSE THAT MAY HAVE BEEN CAUSING THIS:


EXHAUST SYSTEM PRESSURE TESTING ON AN AEROSTAR:


A SLICK MAGNETO THAT MADE IT TO ABOUT 1700 HOURS! (This one has gone to Kevin Herrington at Aircraft Ignition Services, LLC for repair.)


A LOOSE BOLT IN A TURBOCHARGER SUPPORT BRACE: (NOTICE THE RUSTY COLOR IN THE SEAM, WHICH INDICATES CHAFING. ALSO NOTICE THE WEAR MARK UNDER THE WASHER.)

For more information about noticing colors on an engine, check out podcast episode 036 – Tell-Tale Colors in an airplaneā€™s engine compartment.


A FUEL QUANTITY COMPUTER IN AN AEROSTAR:

(We sent this component to Tech-Aire in Wichita, KS because the right fuel gauge was not indicating properly, and “Bill” advised the problem is usually in this box… so I’m hopeful this will fix it.)


PLEASE SEND ME A VOICE MESSAGE OR AN EMAIL:

Which one of these video training courses would you be most eager to learn from:

  1. Servicing landing gear shock struts.
  2. Basic electrical system operation and troubleshooting.
  3. Exhaust valve borescoping and interpretation.
  4. Another idea you have! (Let me know.)

I’d love to hear your thoughts, so click that tab over on the right side of the page and record a voice message, or, send me an email: dean@airplaneownermaintenance.com


Don’t forget, you can get my safety wiring video tutorial course for 20% off through the end of May 2020… click this link for more info:

https://airplane-owner-maintenance.teachable.com/p/safetywiring

127 – No Oil Pressure in a Cessna 150

My friend Matt and I had a plan, and it was going to be an awesome adventure. The crisp, clear morning was as nice as we could hope for on a November day in Virginia. The half hour drive from my house to the small town New Market Airport was absolutely refreshing… exhilarating even.

As I pulled onto the airport drive, I didn’t go far before I was compelled to back up and take a picture of the signs that arrested my attention. “DEAD END STREET” AND “LEARN TO FLY HERE” just did not seem to fit together in my mind. As I think about it, I wish I could replace that top sign with “PATHWAY TO POSSIBILITIES!”

For me, and for my friend Matt, we had far more in mind that day than any dead end street. If our planned adventure came together, we would be flying a little Cessna 150 to Tangier Island (KTGI) and maybe having a crab cake sandwich for lunch. But first, we had to solve a problem… a report of “No oil pressure.”

We struggled to get the “barn doors” open in the old rustic hangar, and the site looked so familiar for these old airports, complete with gravel floor, a motorcycle off to the side, as well as a Cessna 120 and another Cessna 150. I was actually pleasantly surprised when I saw the good condition of the airplane we’d be working on.

We decided to go ahead and start the engine and see if we got any oil pressure within 30 seconds. The engine started nicely and within seconds, we saw the oil pressure needle creeping up… good news indeed. However, after some warm-up time, we noticed the oil pressure needle went back down, and was approaching the red line at the bottom of the gauge. (It had never made it up to the green arc.)

So we shut down, and decided to see if the oil pressure line had any air in it. Thankfully, the gauge was very accessible at the bottom of the pilot instrument panel. After loosening the nut for the oil pressure line behind the gauge, there was not even a drop of oil there. So we attempted to motor the engine with the starter to get the air out of the line.

Now we had another problem… low battery power! The engine wouldn’t even turn over more than a turn or so. Back to troubleshooting, except now in the electrical system.

Matt suspected the alternator was not working, and this proved to be true when we discovered no voltage at the field terminal on the back of the alternator when we turned the master switch on.

Then something jumped out at me… I was standing over on the left side of the engine, and I noticed the whole wiring harness plug was disconnected from the voltage regulator at the firewall. Take a look.

Amazing how well things work when all the wiring is connected properly!

So after charging the battery, we tried again to purge the air out of the oil pressure line. Matt motored the engine with the starter for maybe 30 seconds, and just as he let off the starter, I saw oil seeping out at the gauge connection… success, finally!

This time, after starting, the oil pressure climbed up in the green arc, and stayed there during the runup.

Now, how about Tangier Island? Could we still go?

Nope… I noticed the maintenance records were in the back of the airplane, and the airplane was still in annual… sort of. The main thing is there was some lacking documentation that made it unwise to fly the airplane until it was resolved. Mechanically, I totally would have been confident to go flying in that airplane with Matt. But paperwork-wise, the issue needed to be resolved.

That’s ok… instead of lunch at Tangier Island, Matt and I had breakfast at Dunkin Donuts. And… we’re not giving up on the Tangier Island idea. In fact, after thinking about the whole thing, I did some research, and discovered a young man named Swayne Martin, who gave me even more motivation to visit Tangier Island. He and his brother flew their mom there in a Cessna 172 several years ago as a mother’s day gift! If you’re interested, his post is very interesting.

You may recognize Swayne from his involvement with the Boldmethod online flight training resources. He also has an excellent YouTube channel. I also found out he has gone on to become a first officer with one of the regional airlines. Well done Swayne!

Now back to Tangier Island… Matt and I are not giving up, and I’m confident we’ll still get there one of these days… very possibly in that very Cessna 150 we worked on. And when we do, you’ll hear about it, because it will no-doubt be an excellent adventure for another podcast episode!

It really was a great day, and the sunset view of my neighbor’s field from my back yard, was just as fantastic as the sunrise view on the way to the New Market Airport.

Days like this make me say, “Thank you Lord, it’s good to be alive!”