Ask the A&Ps Ep2 - Never switch it off both!

Should you prime the inside of your airplane, switch fuel tanks on the ground, overhaul a perfectly functioning propeller, and lean with EGT? Check out the latest Ask the A&Ps to find out.

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[dbkonkle]

Was the other student talking about the mag switch and not the fuel selector valve?

[edbreyer]

My thought about why many Cessnas have Left / Right and Both on the fuel selector - If a leak develops in one tank in flight (e.g. leaking fuel cap or fuel sump) I believe you can isolate the tank with the leak to 1) select the leaking tank to use up the fuel in that tank first before it all leaks out (e.g. if in remote area where you can't get to an airport quickly) OR 2) select the tank without the leak to keep the fuel from there from crossing over to the leaking tank and being lost. NOTE: These are just guesses because I have not seen a schematic of the Cessna's fuel system. Thoughts?

[jamessoutar]

My thought on the priming debate is not from the standpoint of longevity, that has been well debated. My argument for priming is simply from the perspective of resale value. Most buyers will do some precursory internet research and the priming issue will definitely come up. It's my belief that a well primed airframe will put more confidence in the buyer's mind and potentially add to the value of the aircraft.

[SoloRenegade]

Cessna 150s are notorious for uneven fuel flow from the tanks due to improper design/venting.

[Webleys]

The C208 Caravan is notorious for fuel imbalance on both. It has a separate shut-off for each wing tank that goes to a 5 gal reservoir in the belly. You can control it with rudder trim but that may have you flying with the ball out of center. Mostly you just fly on one until it balances, which means you are always going back and forth. In theory shutting one off on the ground will prevent cross-feeding but if you are on any sort of slope it'll cross-feed through the vent system and you come in to find all your fuel in the low tank. The only legal way to fly then is to drain it back to no more than 200 lb imbalance or to add fuel to the other side which reduces payload.

[bwalt]

Timing of purchase? I purchased engine and panel as SAME TIME as full kit purchase.
Not even 30% into the build and I have already saved over $30, 000 compared to current prices.
For that, I am willing to take the risk of engine storage (not big when done properly) and glass panel (more software upgrades than hardware these days). I am retired so build time will be relatively short. Weird times with supply chains and pricing.

[sandyanarayanswami]

Excellent podcast and enjoyed as far afield as the UK!

[jbw]

Can’t believe I just missed Mike Busch! How do view your streaming schedule??

[apfelsnutz]

You guys know he's right ! I use MMO one quart with every oil change, and definitely have no lifter clater...LOL !

[prwillms]

About Marvel mystery oil. I went to GM vocational school in 1976 and they said that adding ATF to the oil the detergents in the ATF will flush out the junk stuck piston in the lifter.

[apfelsnutz]

E-225-4s have rotator coils, , , The -8 or-9 must also have.

[D]

Mike's comment about former tax incentives allowing one to buy a new airplane for 10 to 50 percent off is misleading. The 10 percent investment tax credit only applied to aircraft engaged in business use. Leasing your new bird back to a flight school qualified. Accelerated depreciation schedules accounted for the rest, but also required business use. In my experience as an aircraft dealer going back 5 decades, private use has never enjoyed any tax incentives.