Words of wisdom from my POH

[cnoe]

I've seen several references to the POH lately here on MS that piqued my interest. Also, a new blogger suggested that I read through it cover to cover again... so I did.

Here are a few choice things that give me pause (numbered by me in no particular order):

1. The engine is equipped with an external oil filter and the engine oil change intervals may be extended to 100-hour interval providing the external filter element is changed at 50-hour intervals.

2. When it is necessary to raise the aircraft off the ground: ... e. Use a yoke-frame jack under propeller to lift the nose.

3. Leaning using exhaust gas temperature gage. Economy cruise - Enrich mixture until the EGT indicator drops 25 F. or more below peak.

4. Cylinder Head Temperature: Green Arc (Operating range) 300-475 deg F.

5. Fuel Selector Drain: Selector handle on R; pull gascolator ring and hold for five seconds. Repeat procedure with selector handle on L.

I'm just curious if anybody stands by these manufacturer recommendations.

Any other gems to share?

[jonhop]

I do except for numbers one, two, and four. One, even though I just changed the oil at what was logged at 35 hours, 57557 is new to me and it appeared dirty... Two, during the pre-purchase inspection last December, I left it to my A&P inspector who jacked the wings with a weight on the tail tie down, as suggested by a M20C driver. Later, while conducting maintenance on my front wheel due to findings in the pre-purchase inspection, I jacked the nose by using a floor jack and a strong bar inserted in the nose wheel tow/hinge point as suggested by the same M20C driver. It seemed to make more sense to me at the time than to lift the nose via the propeller hub. Four, if on climb out, I see the CHT approach the upper end of the gauge, I lower the nose and enrich the mixture a bit until the needle stabilizes and starts to fall. I'll take the extra fuel burn over an overheating engine any day....

Regards,

Jon

Edited June 29, 2016 by jonhop

[201er]

2 hours ago, cnoe said:

I'm just curious if anybody stands by these manufacturer recommendations.

Nope

[jetdriven]

Climb.. lean mixture for smooth operation... well, for me thats 200 LOP

Cruise, at 75% power and below, lean mixture to peak EGT for best economy. (leaner than peak, the valves burn, but nevermind the fact you have to lean past peak to establish it)

reduce to 26", 2600 RPM for climb. (in 4 minuts full throttle is 26")

per a conversation from a Lycoming mx rep, you can run your engine at 475F indefinitely, and it has no detriment to engine life. its normal.

[ArtVandelay]

Take what engine manufacturers say with a grain of salt, they are in the business of selling engines, it's in their best interest to have your engine make it through the warranty period, then die a slow death...and need to buy a new engine.

[Yetti]

5 would be to get the water out of the lowest point in the fuel system and flush the collator screen.   I

[cnoe]

5 would be to get the water out of the lowest point in the fuel system and flush the collator screen.   I

It looks like your post may have been cut short so I thought I'd add... I still purge the gascolator but in this day of environmental and health concerns I refrain from dumping 10 seconds worth of fuel onto the tarmac under my cockpit. I don't carry a bucket or bowl in my plane for this purpose, and even if I had a buddy to assist with this task my fuel-tester would easily overflow with even 5 seconds of flow. I believe a "brief" pull on the gascolator ring (L and R) should be sufficient unless you find significant contamination in one of the tank sumps. Since I'm not an A&P I'd like to hear if I'm missing something with this line of thinking.

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[carusoam]

CNOE, Nice review of the POH...

What I re-learned by doing that was the cockpit drain is only attached to one tank at a time. It is good to clear the lines of both tanks... Especially if you park outdoors in the weather.

The POHs got longer and longer with some good information.  

Some things to keep in mind...

1) Best practices are like instrument panels, they evolve over time.

2) Some details in the POH are so tiny they get missed or forgotten.

3) Some details get misunderstood.  Good to be able to discuss these things at MS.

4) As good as Byron is as a pilot, @ 200°F LOP, he walks above water...   that would require some extremely good air/fuel balance! (And a few more cubic inches to maintain climb)

Best regards,

-a-

 

 

[Bob_Belville]

Just now, carusoam said:

 

4) As good as Byron is as a pilot, @ 200°F LOP he walks above water...   that would require some extremely good air/fuel balance! 

 

 

I don't think ROP is in Byron's vocabulary. 

[cnoe]

Can't win an air race LOP. At least not 200 F LOP!

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[cnoe]

CNOE, Nice review of the POH...

What I re-learned by doing that was the cockpit drain is only attached to one tank at a time. It is good to clear the lines of both tanks... Especially if you park outdoors in the weather.

The POHs got longer and longer with some good information.  

Some things to keep in mind...

1) Best practices are like instrument panels, they evolve over time.

2) Some details in the POH are so tiny they get missed or forgotten.

3) Some details get misunderstood.  Good to be able to discuss these things at MS.

4) As good as Byron is as a pilot, @ 200°F LOP, he walks above water...   that would require some extremely good air/fuel balance! (And a few more cubic inches to maintain climb)

Best regards,

-a-

 

 

I'm pretty sure that if I dumped 10 seconds of 100LL on the ground in front of my FBO that somebody would come out and holler mean things at me.

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[Yetti]

I can't find the picture, but in the hanger I have a quart glass mason jar and a properly length clear braided hose.  The hose will stay on while you jump in and select left and right and pull the ring.   Then you can examine the fuel and dump it in the tug.  Yetti can't count so I am not sure I go for ten seconds.    In other news, the FBO one time came out to sump the large tank of 100LL goodness and said something like "Never found any water in 15 years, but let's try one more time"

[PMcClure]

Thinking about the time from start to take-off discussion, how much fuel (time) do you think is between the gascolator and the engine?

[Andy95W]

Not sure if the Ovation was discussed last April, but the Lycoming engines were.

 

[jetdriven]

1 hour ago, cnoe said:

 

Can't win an air race LOP. At least not 200 F LOP!

 

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I hav been known to do a LOP takeoff a time or two

[MyNameIsNobody]

J's go 167 knots burning 10.5.

It's in the manual so well it's fact.  I quote it as such.  If you question that my J goes 167 knots burning 10.5 I will see that you suffer the repercussions of your transgression.

Because:  It's in the manual so well it's fact.

Question Authority.

 

But...but...It's in the manual.

Or as Ralpie so famously said to Flick "but the bell rang"...

[cnoe]

I prefer to cruise at 2,000' and 93% power. That way I'm getting the full 201 experience and still burning only 14.9 gph (just like in the book).

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