Ep. 53: What's Under the Hood of a Little Airplane | Explained How it Works

In this video we'll walk you through all of the parts under the cowling of a piper cherokee and what they each do to help make the engine run.
As always, if you have any questions, leave them in the comments below!
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[@robk70]

THANK YOU MAN I UNDERSTOOD AIRCRAFT SYSTEMS IN ONE VIDEO THAN I DID IN A FULL SEMESTER IN MY AVIATION COLLEGE. THANK YOU MAN AGAIN, AND YOU GOT A NEW SUBSCRIBER

[@ezrawillow551]

LOL'D at the Hobbs meter thing. Too funny. :)

[@likes-yv3lj]

I thought that Hobbs was electrical, that pressure switch should be for that tach

[@FlyingBobcat2017]

Been flying these for years and didn't know a lot of this. Keep making systems vids, they're much appreciated.

[@fly8ma.comflighttraining199]

+Christian P Glad it helps! Safe Flying!

[@minaboos9484]

Very helpful video!!! Especially for PPL students !

[@Joe-qj7oh]

I no, it might be Airworthy, but boy is it rough under there, unprotected wires, corrosion everywhere, if it was a used car, you would walk a way from it.

[@TENpilot]

Good explanation mate 😊 👍🏻 👍🏻

[@fly8ma.comflighttraining199]

Glad you liked it!

[@billkrokoship]

Very nicely done!

[@joehohman2168]

Thanks so much, this is super helpful!

[@jamesbabbath5306]

fantastic video! I can't tell you how much this video helps. Thank y'all for making this, definitely subbed

[@fly8ma.comflighttraining199]

Glad it helps! Fly Safe!

[@kv5882]

I love the part "disconnect the open closed switch to turn off the HOBBS meter"....classic!

[@kevinjarchow8812]

Good Stuff. What did you miss? Yep...the landing light wires. Also, what engine model is that? I fly a PA28-161 with a O-320-D3G. Layout is a bit different. Oil cooler is left side rear. There is no box over the electrically driven fuel pump. In fact, I don't have that box at all on the left side. My air intake does not have the landing light in it and the air from the intake goes directly to an airbox holding a fillter.

[@tfilter6]

And if the engine compartment looks that bad, what does the rest of the aircraft look like? I haven't checked for your list of videos, but in case you haven't already, you could use this aircraft to point out and explain things to look for during a detailed inspection (extended preflight or pre buy inspection?) and show what things look like when they need some attention or how to determine that they are still serviceable and safe in spite of looking yucky. You are doing a great job with all your videos, very informative.

[@mattb.7464]

Excellent video Jon!

[@davidaranguren108]

Very informative video, thank you so much for showing what's under the hood, by the way, could you give us more information about the Hobbs thing?

[@fly8ma.comflighttraining199]

Lmao, I'll go into a bit more in a latter video. For now just look for a philips head screw connecting a little wire to a round pressure switch that will be connected with a "T" fitting on an oil line. Once the engine starts producing oil pressure, it closes the circuit and lets electricity flow to the hobbs meter and start ticking.

[@dbflyboy917]

When you're renting, just take a phillips head screwdriver, unscrew both screws holding the hobbs meter in, and disconnect it. Just don't forget to re-connect it before returning the airplane! That's all you need to know about the hobbs :)

[@dukeman7595]

Only if you're dishonest do you need to know this. After all, is it worth it ?

[@MotorcycleMouse]

Lol it’s a joke

[@clivequinn8978]

dbflyboy917 “

[@realvanman]

This was very interesting and eye opening! As one who has spent decades fooling around under the hoods of cars and working on other engines, I had always *assumed* that an aircraft engine and compartment would be extremely neat, tidy, and well laid out, using high quality fittings and lines, and be well maintained. I'm not at all meaning to be derogatory. And maybe I have a touch of OCD, but that really does not look like any of those things under there! Is this a fairly typical example of light aircraft engine compartment? I want to get my mechanic's certification in addition to the pilot's license, and maintain my own airplane to extremely high standards. :)

[@fly8ma.comflighttraining199]

This is fairly typical as most GA aircraft are 30-50 years old, and the old somewhat crappy components are what you are forced to use as it is all that is approved by the FAA. Couple that with flight schools that try to save penny's over improving safety and you get something that looks like this. You can expect this or worse in almost any flight school airplane, even in new aircraft, it doesn't take long for a flight school to leave them in a legal, mostly airworthy state of disrepair. Best to join a club or own your own!

[@chrispennell8287]

Very good video. The thing I don’t understand is that cool air is more dense witch you will get a better combustion. If the air and fuel is being warmed going through the sump surely that would make the engine less efficient

[@fly8ma.comflighttraining199]

That's correct! But engines overheating tend to seize and fail, so less power is better than no power. Remember these engines were designed just after the second world war

[@chrispennell8287]

FLY8MA.com Flight Training. I did nor realise that these engines were that old. Suppose why change something that works. Is the Cessna the same set up as the pa28. When we shut down the engine we lean it off till the shuts down. Is this to use the fuel up that is in the float chamber rather then turning the ignition off. It reminds me of a VW beetle engine.

[@parallelburrito]

I'm new to GA aircraft. I feel having a wide band O2 sensor to be able to accurately control mixture would be helpful. Preventing cylinder wash and running lean saves engines. Also would like to see the starter solenoid in the cockpit. If it failed you could jump it with something to start the aircraft. Starter solenoids can be sketchy.

[@dirtcop11]

It looks like changing the alternator belt is a big chore. I wonder how they do that?

[@DaveBrown1]

Nice vid & good information, thanks

[@BroBri]

Extremely helpful! Thanks for taking the time to explain all of this! I fly a Diamond, but I'm sure a lot of this is transferable.

[@mikerossscuba]

Can you do one of these with a C-172? Tx!

[@BrianEdlin]

nice video and great advice on the Hobbs meter I wish I had known that years ago:) are you also an aircraft mechanic?

[@fly8ma.comflighttraining199]

Lol, could have saved us all a lot of money if some one told me that day one of training. And I'm not, unfortunately don't have the time to get the two years required work experience in a shop to get the A&P cert. Pretty much taught myself how to work on my own aircraft (I've had quite a few) as I've always had a hard time finding an A&P that would do 100% of what I wanted done, in a timely manner, done right the first time, and not at rates of $100+ per hour. Not to knock the profession at all, just seems to get it done right you have to do it yourself.

[@team-pk7be]

I don't understand the point of disconnecting this Hobbs meter?

[@mustangszz]

Well, he was just making a joke I'm sure. Most FBOs and flying clubs have renters log both the Hobbs and the tach before and after. If there were an obvious inconsistency, well, it would be rather obvious when it occurred.

[@fbnx4219]

So is it possible to work on your own aircraft in the US without having that certification?

[@JakeDobyns]

Dude you are a champ, your videos are so helpful. This one in particular and Ep. 52 explained a handful of things I couldn't find ANYWHERE else. Thank you!

[@tfilter6]

Great Video. but from the appearance of that engine compartment, especially the messy looking wiring, I don't want to fly in that aircraft. I would reject it on preflight, or spend a few hours replacing a lot of stuff before I would fly in it.

[@royrached6668]

Great video ..now lets talk about jet engine hhh

[@davidwallace5738]

Thank you sir

[@tessalovespasta]

This is hands down the best informative video I've watched. Really appreciate that you took time to point out and explain the different parts and uses.

[@fly8ma.comflighttraining199]

Glad it helps out! Good luck with your training! Check out some of our other training vids on our playlists too!

[@stevejarvis1366]

Just found this vid, excellent thank you

[@fly8ma.comflighttraining199]

Glad to help ya!

[@faainspector9699]

The engine compartment of this aircraft is shameful...........neglect would be the key word here...........an accident waiting to happen and all preventable..

[@darrenmaria7299]

fantastic video. as a student pilot who purchased a Piper Cherokee exactly as you show and a mechanical engineer who has to know how everything works, i can say that this has answered several questions i had about the overall inspections i make pre-flight. i really appreciate your thoroughness.

[@fly8ma.comflighttraining199]

Glad it helps! Fly Safe!

[@jfs116]

I started taking flying lessons 30 years ago and stopped I’m going to get started as I watched my first introductory in lesson I was shocked on how many people did not understand the basics like how many tires does The average single engine small aircraft have

[@outoforder0101]

Call me paranoid... But, for a vehicle that goes up in the air... It does not look very reliable!

[@fly8ma.comflighttraining199]

Haha, don't disagree, but that thing has flown another 800hrs since that video was made without issue. They're all pretty tough machines!

[@b.snoodleman5864]

How did this thing ever get a airworthiness certificate? Just about every thing he pointed at and said was important was fucked up in some way. Thank God the oil filter is safety wired because that would spin loose long before the oil cooler lines that are almost completely blocked off by the heat distortion and kinks they have all over them would fail. I seen lawnmowers less cobbled together than that thing.

[@fly8ma.comflighttraining199]

Welcome to flight school airplanes in FL....can't say I really miss flying those things. Another reason to own your own instead.

[@b.snoodleman5864]

Good point, you cant just call AAA when flying a rented aircraft. I did like your video and learned somethings from it. Hope I didn't come across as a dick with my first comment. see ya, Jon

[@Jhelm]

FLY8MA.com Flight Training Lol I was saying to my self. Looks like a flight school airplane. Greedy flight school owners...

[@burner188]

Was thinking the same thing. All stuff that should be captured during the next 100-hour.

[@jimstanley_49]

Its maintenance periods keep getting stretched due to repeated disconnection of the Hobbs.

[@Hubjeep]

Awesome video! I know very little about airplanes, but am interested. This looks like the Jeep CJ-5 equivalent of an airplane... simple! Are new ones all computer-controlled?

[@subsoar5734]

to an extent but not so much. your new airplanes will be fuel injected with injectors that work similarly to your car, but the rest of it more or less works about like this. the FAA isn’t huge on over computerizing stuff like this.

[@Hubjeep]

@@subsoar5734 Thanks!

[@subsoar5734]

this video made me chuckle a few times because it’s just jon giving a tour while finding things wrong with his airplane

[@MrChip8970]

Looks like all the hoses on this P28 needs replacing. As a matter of fact the whole engine compartment needs some attention. New Baffles new hoses clamps . As I can see you have no Carb heat or cabin heat. I hope youre not offended but looks like these things were just difered and never fixed during the 100 hr or annual. Frankly if I were to open the cowling and see all this I wouldnt fly the airplane.Not because of air worthiness just because I knew the owner was trying to be cheap by not fixing the issues. I am sure his AP has told him about the carb heat hose and cabin heat hose many times because that hose doesnt get that bad of shape in just one annual inspection. Those hoses have probably needed replacing for years as well as the Baffles. When my life depends on everything working I spare no expense on maintenence. This isnt a car you can just pull over to the side of the road lol I would seriously have your owner fix these things

[@brandond5209]

Surprised there I didn't see a birds nest under the cowling

[@johnlynn5616]

You might want to make sure that intake tube is the correct one. I was just reading an NTSB report on a Cherokee that had an engine failure followed by a water lading caused by a collapsing induction tube. I can't tell by the video but you already have one collapsing tube in there, I would hate to see another one. Good luck and great video.

[@johnnyflores3426]

Great video. Now I learned something new. Thank you.

[@fly8ma.comflighttraining199]

Glad it helps! Let us know what topics you'd like next!

[@abdaleali1438]

Where can i get second hand engine I want to buy it

[@John-bv2ft]

Sorry but that plane needs a good mechanic to get it up to an acceptable standard. Too many possible faults waiting to happen.

[@crawford323]

How about the alternator field wire and voltage regulator unit? Is this built into the alternator with this model of aircraft?

[@jfs116]

I noticed there are multiple colors of spark plug wires is that just because they replaced only the bad ones

[@mg1535]

So the air that enters the engine after activating carb heat is just ambient air inside the engine cowling that flows through the heating shroud? I’m still a little confused how it gets pressure to be used in combustion?

[@bwagenberg]

I wish there was a Scotty Kilmer of small plane repair. Learn to do most repairs yourself.

[@SteeringWheelOperator]

Or Chrisfix and even Sweeeeeeet Project Cars !! :D

[@Tesseract1887]

I would love that

[@Tesseract1887]

@@SteeringWheelOperator no, no no no no absolutely not, anyone but chrisfix

[@tomiasthexder7673]

Rev Up Your Airplanes!

[@edwardjimenez9107]

Very informative video! The best engine description ever, thank you!

[@chrisbrodbeck1961]

im wondering if you could put a super charged celica v6 in one of those babes....lol

[@TheAirplaneDriver]

That airplane should not be flown with a collapsed carb heat scat tube and that huge tear in the baffle seal. If you are going to do an instructional video you need to tell people that.

[@kimberlywentworth9160]

Disconnecting the Hobbs meter is theft. Flying is expensive.

[@bichus007]

One of the most useful video out there !!! Now i feel i know my cherokee better !!! Thanks

[@fly8ma.comflighttraining199]

Glad it helps! Let us know what topics you'd like to see next!

[@airplanegeek893]

FLY8MA.com Flight Training where is the battery located?? I opened the access door on my Cherokee 140 behind the aft seats and couldn’t find it nowhere... thanks

[@keithlucas6260]

great, suck the heated air intake tube flat, and the rusted springs so they can gouge the cylinder walls resting on the rings, and short the plugs, mess up the valves and valve seats. I've seen this before, and it ain't pretty, but it is pretty expensive, and rather risky being up in the air. Great job explaining everything and showing where. I was in the Air Force, and we had Tail Number "shadow" mats, where all the parts went during disassembly, exchange, and rebuild. The A&P log book was on a log rack, or wall for sign off.

[@georgschwiemann2353]

Just what I thought, I saw that heated intake air tube and paused to come down here & check for comments. Be great if that decided to suck closed as you left ground effect on take off ! Just watched a bit further and was relieved to see that it is "T'd" and could at least get cold air from the nose :)

[@babyface1956]

You're the boss bro! Recently got my comm ratings and my power plant training wasn't so detail. Thanks!

[@fly8ma.comflighttraining199]

Glad it helps! Be sure to share us with your friends on FaceBook and around the airport!

[@bills1654]

poor looking engine

[@maheralazzawi7814]

good job

[@onecircle1]

Someone really let that engine go. what a piece of crap

[@maheralazzawi7814]

GOOD job Excuse me how can we make clerance valve check

[@jackglossop4859]

I’m shocked at how messy it all is. Is that normal? 😳

[@creativespridgets]

John, you mentioned defeating or actuating the Hobbs meter during flight training, saying that was "the single best piece of advice" you gave. Can you please explain further what you meant? I'm confused.

[@hannahd5681]

He was joking, the Hobbs meter records flight time in the aircraft, which is the time you’re charged for. His joke was if it doesn’t work you wouldn’t have to pay for the flight time

[@vadermike7772]

Fabulous video! And perfect timing! I am currently looking into purchasing a cherokee warrior 2, so it is great to have an idea on the inner workings, and parts. Thanks so much for posting, it was very informative!

[@fly8ma.comflighttraining199]

Glad it helped! Hope the new airplane works out for ya! Wish they sold extended warranty's for aircraft like they do cars.

[@Iverson8811]

super deep detail inside the cowling. thanks for sharing. would you make a video for skyhawk?

[@fly8ma.comflighttraining199]

We'll have a video for a cessna up soon. Safe flying!

[@fbnx4219]

Something that I have been wondering about for some time now: Why do I loose some power, when one magneto fails? I mean, the cylinder still gets ignited, right?

[@fly8ma.comflighttraining199]

You get a small decrease in power because the fuel and air is not burning as completely. The flame from just the one plug has to travel all the way across the cylinder and that takes time (relatively speaking)

[@fbnx4219]

Thank you for explaining! I guessed something in that direction.

[@jayheg4530]

has that enging been overhauled 42 times?

[@kpatrol]

Thank you again, for another great video!

[@fly8ma.comflighttraining199]

Always happy to help!!

[@yacahumax1431]

Is this the plane that you are destroying now?

[@johnspieth1237]

Did you have any trouble getting the Parmetheus LED landing light to fit? The cooling fins on the back prevented me from getting the retainer over it on my PA-28-140, and I’ve read of similar troubles from others. Any suggestions you could share? Thanks, great video.

[@WaterDesignirrigation]

Awesome video. Do more . Student pilot here.

[@christiaankruger5299]

hahaha 15:20 !! Best advice lol!

[@lomgshorts3]

Very good video! Now, is the Lycoming ready to be overhauled? I wouldn't be taking that plane anywhere in the visual condiion it is in. Fuel and vacuum lines bubbled and collapsed? Plugs encrusted by carbon - a natural conductor of electricity. Wires that look old and insulation stiff enough to break or crumble off causing a short? Rust deep on exhaust pipes and flywheel? That Lycoming neeeds money and TLC before it flies again. Could that plane been in storage too long? You may be able to get away with that deterioration in a car, but not in any piston aircraft.

[@jcfireman2215]

That plane is a wreck.... fire that mechanic

[@lukesolondz8347]

Why would they want the air/fuel mixture to cool the oil right before entering the cylinders? Wouldn't that warm the air, making it less dense and therefore make the engine perform slightly worse? Or because it would be the same quantity of air already having been mixed, would performance not change?

[@marshallallensmith]

Cool video. I was probably most impressed when seeing under the cowl of the Cessna 195 though . Talk about a thing of beauty and not one centimeter of wasted space ;'-)

[@tpj1959]

I wanted to see the lines going to the alternator. One of the lines to our alternator keeps resting on the muffler and then we (club plane) get alt light. The line runs to the right side of the alternator and it also has a small black wire attached to it there. What is going on with that? Our tech doesn't seem to think the wire resting on the muffler/exhaust is a problem..This is a new build since we had a ground fire and we did repairs. I'm going to zip tie it today and see what happens.

[@VoteJaySchwartz]

nice video. How much time is on the engine? Perhaps the next video could compare accessory condition with 500hrs, 1000hrs, 1500hrs etc. Too many times a cheap part ignored becomes a major expense.

[@fly8ma.comflighttraining199]

That engine has right around 1000hrs and is 7 years old. It's had a hard life being near the saltwater based on the west coast of Florida. Certainly some cheap parts have caused major damage (bad exhaust gaskets at only a few $$ each). Also an A&P was trying to diagnose a bad mag and which cylinder was not firing, he did a water test by spraying water on the exhaust to see which was the cold cylinder. Problem was he didn't have water in a spray bottle handy so he used degreaser in a spray bottle that had pretty high acid content and did some serious corrosion acceleration to the spark plugs and #2 and #4 intake pipes (wasn't very careful with his spraying). If you look closely you'll see the paint peeling and chemical drip marks.

[@VoteJaySchwartz]

FLY8MA.com Flight Training. I am based out of KHWO. Looking forward to taking a ride to Venice one of these days. Looks like a nice place to fly out of. You bring up a good point, having a competent A&P is critical.

[@AbudaBlue]

So awesome video. I have a question. When we turn one carburetor heat, i understand hitted air by muffler goes in to carburetor. But, from where does the original air come from? The air comes from cabin heat air inlet? Or is there other holl on the cawling?

[@christopherhadsell9049]

This vid is bookmarked. Suppose they don't have it at Autozone?

[@reyesben]

I think I finally understand why carb heat is not applied routinely in Piper aircraft

[@pilotken8685]

Looking at purchasing a Cherokee and these videos are just amazing!!! Especially since it's the same model aircraft! Thanks for these!!

[@THOGVLOG]

great video but you missed the shimmy

[@turningdownwind5535]

What year is this cherokee? thanks

[@fly8ma.comflighttraining199]

1967 I believe.

[@coreyfreeto3226]

Great video! Thank you!

[@machoturbo8937]

Great video. Very informative. Massive help as I prepare for PPL oral and checkride exams. Thanks 🙏

[@dannymitchum5]

thanks man.

[@GreenMotions]

GA Airplane engines are really outdated. Carburetor?

[@brucekratky7993]

No free rides. Leave the Hobbs meter alone and functioning. Simple ethics 101 I guess.

[@mustangszz]

Most every flying club and FBO log both the Hobbs and the tach anyway. I think he was just making a joke.

[@kv5882]

Was clearly a joke which I found funny as hell!

[@tfilter6]

Dont that go by the rpm counter rather than the Hobbs time running?

[@jimstanley_49]

Hard to tell. He replied to another comment with more detail and it read straight. He should be more careful about encouraging fraud.

[@constancyg.c5306]

everything looks so simple why are engines so much money thou

[@Munky332]

Because of the tolerances, required maint schedules, average labor hours required, and "expertise" / licensing / certifications required. You can't just back-yard mechanic an aircraft to fly without putting yourself or someone else in some serious danger, unlike a car where you can 9/10 times just pull off to the side of the road.

[@tfilter6]

The aircraft in the video must have had a backyard mechanic, certainly not a professional. If I were to be asked to work on that one, I would insist that a whole lot of things be fixed before I would certify anything I did on it. I don't even let my cars get that ratty under the hood. I kind of think this aircraft is not being used but the new oil filter makes me wonder. Maybe it's used just for ground run-up demonstrations.

[@FromSagansStardust]

@@tfilter6 The oil filters always look new on flight school planes, they get changed every couple of weeks.

[@thepurpleufo]

Great video...thanks. So funny how, even today, most of us are still flying with 1940s and 1950s "technology."

[@vkarabin]

Can you do a video on how to do an oil change?.. thanks

[@fly8ma.comflighttraining199]

Check it out! kzbin.info/www/bejne/qF7Ie3-Yed6LjKM

[@likes-yv3lj]

1:04 are those lines draines?

[@brotherstorman]

Wish I could have had this video when I started training, I will make sure my daughter watches as she will begin soon.

[@bongofury67]

Great vid!! Very informative. One question.....Why the wire on the oil filter? I mean cars dont need one, right?. I assume its to make sure it stays in place. Anyway, just wondering. Keep the videos coming!!!

[@bongofury67]

Actually, now that I think about it, that was a dumb question. If that oil filter spun off you could have a seize in midair. Not good. At least with a car you could just pull over. Im new at this. Sorry, my bad.

[@bud3965]

Ah so that's where the airplanes black box is

[@fly8ma.comflighttraining199]

:'D

Why do many small airplanes´ engines still have carburetors ?!?

[@fly8ma.comflighttraining199]

It's just the way they were certified way back when...very expensive to update them. Many of the new airplanes are certified with fuel injected engines. Airplanes typically always lag behind the car innovations a bit.

[@JimPaar]

Love this video, learned a ton even know I already have my PPL. How did you come up with your domain name, just curious. Thanks

[@fly8ma.comflighttraining199]

Just happened to be the last three of a tail number on a 150 I had just bought when I started making these videos. honestly wasn't much though put into it. lol

[@csmihaly]

Priceless.

[@rodneyduran8223]

...Again cool video!

[@DonaldDJHuebner]

What do you think about the cam shafts in that engine? I'm considering buying a 67'.... Last flight was in 94'. 1730 hrs.

[@fly8ma.comflighttraining199]

Uh, that sounds like a scary prospect. I wouldn't touch it til it had 25-50 hrs on it within the past year and then take a look in the oil filter and maybe pop a jug and look at the cam.

[@AhmedAli-xy2jd]

Thank you so much, really amazing explanation. (5 star)

[@bravopapa6631]

Thanks so much for your time and effort. Can you explain the Hobbs sensor? Why will it be beneficial to know about the Hobbs sensor before training in a Piper?

[@fly8ma.comflighttraining199]

It's how you will be billed for the airplane rental, basically it is a small clock that measures time in hours and tenths of an hour. A tenth of an hour (0.1) usually costs you $15 or so when renting, so while it would be totally dishonest to mess with the system, we all like to joke about how to make it run a little slower or not work at all.

[@WavetechPowerSports]

Good lord, I have Seadoo watercraft in my store with less corrosion, not too mention better technology. I am surprised they don't use a stainless hose clamp around the oil filter to use with the safety wire vs. relying on that little tang.

[@fly8ma.comflighttraining199]

50 year old airplanes living near saltwater certainly do not fair well. On top of that it would be great to swap many components to SS, but it has to be FAA approved parts, and they are generally zinc or non-anodized aluminum at best.