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Ask the A&Ps

Experts Mike Busch, Paul New, and Colleen Sterling answer your toughest aviation maintenance questions. Submit questions to podcasts@aopa.org. New episodes are released the first and fifteenth of every month.
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Episodes

"Don't split the case halves"

A light oil mist on his windscreen has one caller concerned he needs to split the case. Plus, Mike, Paul, and Colleen tackle cold cabins, tire changes, and horsepower calculations. Email podcasts@aopa.org for a chance to get on the show. Join the world's largest aviation community at aopa.org/join Full notes below: Grant has a Mooney M20F and he’s seeing a light mist of oil on the windscreen after flying. His mechanic thought it was coming from a case bolt, which he re-torqued. That didn’t solve...

Apr 01, 20241 hr 1 minSeason 1Ep. 53

"This guy is on his own, he's a test pilot"

A Vans customer wonders what to do next, and a 172 pilot asks if carb heat is really necessary all the way to the ground. Plus, the best spark plugs, and a vexing gear issue are on tap for Mike, Paul, and Collen this time. Email podcasts@aopa.org to be on the show. Join the world's largest aviation community at aopa.org/join Full notes below: Greg has a kit from Vans on order and he’s wondering what to do next. He can replace his quick build wing kit with the small cracks installed, but he wants...

Mar 15, 20241 hr 5 minSeason 1Ep. 52

"Let us know how the exorcism goes"

This episode Mike, Paul, and Colleen help an owner with an engine that randomly dies after 2100 rpm. Plus, the role of avgas as a lubricant, prop governor issues, and getting back into maintenance. Email your question to podcasts@aopa.org for a chance to be on the show. Join the world's largest aviation community at aopa.org/join Full notes below: Dennis has a Cardinal RG with a prop governor issue. When it’s warm, the prop underspeeds just a little. He’s done a bunch of troubleshooting, and he ...

Mar 01, 202459 minSeason 1Ep. 51

"The breather is a slobber pot"

Mike, Paul, and Colleen help an owner raise his oil temperatures, explain the rules around ELT battery replacements, debate the merits of a tuned exhaust, and help an owner whose airplane won't quit. Email podcasts@aopa.org for your chance to get on the show. Join the world's largest aviation community at www.aopa.org/join Full notes below: Chris has a Super Decathlon with CHTs as low as 270 degrees and oil temperature around 150. Even with the oil cooler covered during winter, it still doesn’t ...

Feb 15, 202455 minSeason 1Ep. 50

"Think of the prop control as a gear shift"

This episode Mike, Paul, and Colleen debunk myths, describe valves that are eligible for lapping, and cover the basics of the red box and leaning. Email podcasts@aopa.org for a chance to get on the show. Join the world's largest aviation community at aopa.org/join Full notes below: Maciej is a new private pilot who is questioning some operational procedures he was taught. He was taught not to put fuel back into the tanks after sumping it, and he thinks if you sample it and it’s clean, why not pu...

Feb 01, 202452 minSeason 1Ep. 49

"Major and minor is in the eye of the beholder"

With everything going electronic in the cockpit, will owner-produced parts become a thing of the past? Plus, Mike, Paul, and Colleen talk about their least favorite magnetos, deferring maintenance, and more. Email podcasts@aopa.org for a chance to be on the show. Join the world's largest community of aviators at aopa.org/join Full notes below: Justin owns a Columbia 400 and he’s wondering if he can make owners-produced parts for some of his electronics. The hosts agree that this is a problem wit...

Jan 15, 20241 hr 1 minSeason 1Ep. 48

"It's not good form to jam the throttle forward"

Why you shouldn't jam the throttle forward launches this episode. Also, Mike, Paul, and Colleen help an owner with high oil temperature, advise a builder on engine modifications, help ease the mind of an owner with water in his tanks, and discuss how best to use a borescope. Email podcasts@aopa.org for a chance to get on the show. Join the world's largest aviation community at aopa.org/join Full notes below: Juan has a turbocharged 210 and he's having trouble going full power on takeoff. He flie...

Jan 01, 20241 hrSeason 1Ep. 47

"We call it an Italian tune-up"

Mike, Paul, and Colleen help an owner with a bad lifter that shows itself after oil changes, guide an owner through a change his maintenance schedule, discuss what constitutes damage history, and take a guess at why POH numbers change over model years. Send your questions to podcasts@aopa.org for a chance to be on the show. Join the world's largest aviation community at aopa.org/join Full notes below: Steve has a 1975 Taylorcraft with an O-200. After oil changes one of his cylinders has some val...

Dec 15, 202356 minEp. 46

"Use whatever time runs the slowest"

Prop hubs that were nearly scrapped, how to properly measure the oil level, semi-synthetic oils, and tachs that don't agree are on tap for this episode. Email podcasts@aopa.org for a chance to get on the show. Join the world's largest aviation community today at www.aopa.org/join Full notes below: Bill has a Cessna 182 with a prop that hadn’t been overhauled for about 7 years and 600 hours. This past March he had to send the engine off for some work, and he decided to send the prop off at the sa...

Dec 01, 202357 minSeason 1Ep. 45

"You can't fully pickle it"

This episode is all about engines--how to fix one that runs rough, how to save money when buying one, why one went bad so quickly, and how to preserve one during a build. Email podcasts@aopa.org for a chance to get on the show. Full notes below: Brendan’s friend has a Taylorcraft with a tricky engine issue. It started with low rpms in flight, and has since been repeated on the ground. The mags have been rebuilt, both mags swapped, cylinders reworked, new carb swapped, new plugs, and they even by...

Nov 15, 20231 hr 7 minSeason 1Ep. 44

"Cleaning injectors causes more problems than it solves"

How far can you go with preventative maintenance? The hosts discuss this, plus oil-soaked plugs, a strange fuel smell, morning sickness, and more. Email podcasts@aopa.org for a chance to get on the show. Full notes below: Lamberto has a 152 with oil soaked plugs, and is having to clean them every 25 hours. He wants to fix the problem, not simply deal with it. His mechanic suggests a harsh chemical. He’s tried new plugs without success, the hosts agree his BY plugs are the best for oil-fouling an...

Nov 01, 202357 minSeason 1Ep. 43

"Why don't you just fix the problem?"

How cold is too cold the fly? Mike, Paul, and Colleen answer this question, and help an owner solve radio problems, advise an owner to fix his probes, and describe the process to become an A&P in the latest episode. Send your questions and comments to podcasts@aopa.org for a chance to be on the show. Full notes below: Chad has a Cirrus and he’s looking for some cold-weather guidance. A mechanic told him that subzero temps aren’t recommended for a piston. The POH says that flights below -23 d...

Oct 16, 20231 hr 3 minSeason 1Ep. 42

"It's not the mechanic's job to make flying cheaper"

A compass that works on the ground but not in the air leads to a fun debate between Mike, Paul, and Colleen. Plus, the basics of lean of peak (again), jailbreaking a Rotax, and the liabilities of being a mechanic. Send your questions to podcasts@aopa.org for a chance to be on the show. Full notes below: Blake flies a Mooney that has a compass with a mind of its own. On the ground it works well, but in the air it vibrates a bit, but otherwise doesn’t move. Paul said his fuselage can become magnet...

Oct 01, 202357 minSeason 1Ep. 42

"Inspections are an imperfect process"

While one owner has too much of a good thing and lots of shops to choose from, another is second-guessing if the massive check to the cylinder shop was necessary. In this, our first crack at twice-monthly episodes, Mike, Paul, and Colleen spend more time as therapists and counselors than technicians. Submit your questions to podcasts@aopa.org for a chance to be on the show. Full notes below: Chris has a 182 with a recently overhauled engine that he’s concerned is making too much metal. In fact, ...

Sep 15, 202348 minSeason 1Ep. 41

"Don't attack anything with tools"

Did Paul give us the definitive guide on how to hot start an airplane? Try his technique and see what you think. Also, unnecessary cylinder removals, a faulty tach, and a letter writer and guest who question if burping is safe. Send your questions to podcasts@aopa.org for a chance to be on the show. Full notes below: Walt has a Seneca and has had to replace three cylinders in the last five years. He’s concerned that his mechanic caused the problem after hammering on his exhaust to remove it. The...

Sep 01, 202353 minSeason 1Ep. 40

Live from Airventure 2023

Live from EAA Airventure 2023, check out our second in-person show. The questions come fast, and everything from proper leaning to oil leaks is covered. Can Oshkosh-goers stump Mike, Paul, and Colleen? Full notes below: The first question has Colleen in stitches. Can you widen the gap on your spark plugs to get more horsepower from an engine? Short answer? No! Don’t do it, the hosts agree. Even Colleen, who races airplanes at Reno, says she’s never heard of doing this. Richard has a 182 and says...

Aug 15, 202349 minEp. 39

"My airplane is so clean you can eat off it"

How to start an airplane, whether or not to wash an airplane for an annual, flying through smoke, and high TITs are all on tap for this grab bag of an episode, as Mike, Paul, and Colleen take your toughest questions. Write to podcasts@aopa.org for a chance to be on the show. Tony owns a turbo Twin Comanche with 300 hours on the engines. He burns about 14 gallons per hour on takeoff, but he thinks he should be burning 16 gallons per hour. As a result, he gets high cylinder head temperatures quick...

Aug 01, 20231 hr 1 minSeason 1Ep. 38

"The only that thing that can cause CHT to rise that fast is pre-ignition"

In two separate but similar incidents, owners want to know whether their cracked spark plug insulators caused pre-ignition or if detonation ruined their plugs. Mike, Paul, and Colleen tackle those questions, and many more. Email podcasts@aopa.org for a chance to get on the show. Full notes below: Mitch has a Mooney that developed a strong engine vibration a few minutes into a flight. He quickly discovered the problem as the cylinder head temperature was climbing, and he went full rich and reduce...

Jul 01, 20231 hr 2 minSeason 1Ep. 36

"I'm a total turbocharging bigot"

Paul and Colleen broadcast from Dayton, Ohio, for Aviation Maintenance Technician Day, and together with Mike, do their best to help owners suffering with engine problems, mysterious cold air leaks, improper fuel indications, and more. Send your questions to podcasts@aopa.org for a chance to be on the show. Full notes below: Jim has a heavily modified Twin Comanche that blows cold air on the back of his neck, and he can’t find the source. He suspects it’s from the rear tailcone, but he can’t fig...

Jun 01, 20231 hr 15 minSeason 1Ep. 35

"Pop that cowling off and squirt away"

A grab bag of unique questions come at Mike, Paul, and Colleen this month, including whether to buy new or overhaul, how prop stops work, what happens when you reduce from wide open throttle, and avoiding tiedowns. Submit your question to podcasts@aopa.org for a chance to be on the show. Full notes below: Dale has a Seneca and he’s looking to the future and having to overhaul two engines. He’s wondering how to decide between factory new, reman, or overhaul. Not surprisingly, they suggest flying ...

May 01, 20231 hr 6 minSeason 1Ep. 34

"This is a classic infant mortality failure"

With two important airworthiness directives recently issued for Continental engines and Cessna Cardinals and 210s, Mike, Paul, and Colleen dig deep on the surrounding capacity and safety issues. Then they take calls on the limitations of engine monitors, and how normal can look anything but. Submit your questions to podcasts@aopa.org for a chance to get on the show. Full notes below: Michael has a turbonormalized Bonanza and he’s concerned his system isn’t operating properly. When full throttle ...

Apr 01, 20231 hr 12 minEp. 33

"The airplane looks like it's having brain surgery"

Mike, Paul, and Colleen debate the difference between a bribe and incentive pricing, discuss how much carbon in the oil filter is too much, counsel an owner how to keep his alternator belt on, and reveal what's in their go-bags. Email podcast@aopa.org for a chance to get on the show. Full notes below: Jim is finding a significant amount of carbon in his oil filter after oil changes on his Cessna 182. He wants to know if the carbon is a problem. Mike said the carbon itself isn’t a problem, but it...

Mar 01, 202357 minSeason 1Ep. 32

"You may have to go to a different shop"

This month Mike, Paul, and Colleen give an owner the ammo he needs to not overhaul his engine prematurely, help console an owner with super hot cylinders--maybe, console another with super cold cylinders, and give cover to a pilot who wants to refill his own oxygen. Send your comments and questions to podcasts@aopa.org for a chance to get on the show. Full show notes below: Pat’s Diamond has one suspect cylinder. The mechanic said it has failed inspection, and needs to be replaced, but the engin...

Feb 01, 202352 minSeason 1Ep. 31

"There are critters living in there"

Did you know things live in jet fuel? These are the fun things you learn being a mechanic. Mike, Paul, and Colleen enlighten us on this strange fact, and tackle questions on leaning, burned exhausts, puddles of oil, and how not to set your airplane on fire when preheating. Email podcasts@aopa.org with your question for a chance to be on the show. Full notes below: Chris owns a Piper Comanche with 1900 hours on the engine, and it that has developed an oil leak of one quart every 2.5 to 3.5 hours....

Jan 01, 20231 hrSeason 1Ep. 30

"You have two options and a top overhaul isn't one of them"

Adam flies a Piper Warrior owned by his friend. On a recent flight he experienced some morning sickness that he was able to resolve. On a subsequent flight the owner had morning sickness as well. The owner is considering a top overhaul. Mike said he has two options, and a top overhaul isn’t one of them. The first is to do a wobble test and the second is to skip the test and go straight to reaming the valve guides. Paul recommends doing only one at a time. He said not to fly it again until the pr...

Dec 01, 20221 hr 3 minEp. 29

"All engines deserve an engine monitor in their Christmas stocking"

Engines are the focus this month as Mike, Paul, and Colleen talk about valve failures, valve springs, burned valves, and more. And of course we had to have a leaning question. Send your questions to podcasts@aopa.org for a chance to be on the show. Full notes below: Marius owns a Cessna 172XP that routinely has a rough mag check on run-up. His mechanic is recommending fine-wire spark plugs after finding oil on the plugs. He has since bought them, which set him back more than $1,500. Colleen rece...

Nov 01, 202253 minSeason 1Ep. 28

"We're card-carrying members of overthinkers anonymous"

Making new parts, protecting parts, replacing parts, and identifying bad parts is the theme of this month's episode. Plus, a spirited discussion on fuel selectors. Send your questions to podcasts@aopa.org for a chance to be on the show. Full details below: Greg is building an RV-10, and he’s wondering if he should prime all the skins while he builds to ensure there’s good protection inside and out. Mike, Paul, and Colleen disagree on what to do. Paul thinks he should skip the priming and instead...

Oct 01, 202257 minEp. 27

"I'm a choir boy in the church of lean of peak"

Because it's impossible to make it through an episode without discussing leaning, Mike, Paul, and Colleen hit it from two sides this month. A debate about inoperative equipment, and why mechanics reach for the pressurization cart first. Submit your questions to podcasts@aopa.org for a chance to get on the show. Full notes below: Jay flies a Lycoming IO-540 on an experimental with one cylinder that peaks long before the others. He’s tried everything, including switching injectors. Mike suggests c...

Sep 01, 202256 minSeason 1Ep. 26

"I don't have a baby monitor on the engine"

This month Mike, Paul, and Colleen take questions from owners with round engines, fabric, fire-breathing aerobats, and more. Send your questions to podcasts@aopa.org for a chance to get on the show. Full notes below.... Bruce has an a Continental O-300 and recently replaced all six cylinders. Number four is still running hot, and number six used to run hot. He played with the baffling to reduce the temps on number six, but number four is still around 400 degrees in cruise. He also added a splitt...

Aug 01, 202249 minSeason 1Ep. 25

Live from Airventure 2022

Introducing our first live show from EAA Airventure 2022! Join along as Mike, Paul, and Colleen handle questions on the spot from the audience at the AOPA Program Pavilion.

Jul 28, 202242 minSeason 1Ep. 24
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