Gear's Down - Prop's Fine

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PilotDAR
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Re: Gear's Down - Prop's Fine

Post by PilotDAR »

Although off topic a little, a few years back, I flew the formal noise testing for the 182 amphibian following a Continental 550/MTV prop, and Gomolzig exhaust for Transport Canada and EASA noise compliance. This testing involved 39 overflights of a microphone 2km from brake release. The passes were flown at different power settings. Considering RPM as a factor in power being developed, with full open throttle, and all other things equal, the difference in crossing altitude 2km from brake release between 2700 RPM all the way, and 2500 all the way (from brake release, takeoff, and climb to the microphone point) was 60 feet - hardly anything in the grand scheme of things. The flying was very precise, and recorded in many parameters, so the data (though gathered for noise) can be considered persuasive in terms of performance. The MT STC for this prop on this plane is limited to 2500 RPM (EASA, for noise), where the FAA STC for the same combination is 2700 RPM (noise compliance not required). The 200 extra RPM isn't really getting you much more.

So screaming the engine is not really getting you a lot more performance. On the other side of that, lugging it will create a detonation risk, a whole other discussion. Interestingly, when we landed at a very popular airport on an island in the north of Germany, were were asked to produce a noise certificate. Fortunately, the Transport Canada approved Flight Manual Supplement contained a statement about noise, and the airport officials accepted that. Without the noise certificate, our landing fee would have been many more Euros.
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shimmydampner
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Re: Gear's Down - Prop's Fine

Post by shimmydampner »

C.W.E. wrote: Tue Nov 06, 2018 7:45 pm By the way what type of aircraft do you fly that requires full fine pitch on a normal missed approach?
The Viking manual for the 300 series twin otter calls for props full increase following selection of flaps 10 on approach, or when the reset props caution light illuminates, whichever occurs first. It specifies they must be full increase prior to 500' AGL when visual or 500' above DH/MDA on an instrument approach. For go around, the first order of business is to set takeoff power and ensure props are full increase. It also states that with flaps 10 and props full, aircraft performance and handling will be very similar to a normal takeoff.
The 705 turboprops I've flown also call for full fine props on approach and for go around.
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C.W.E.
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Re: Gear's Down - Prop's Fine

Post by C.W.E. »

Interesting, it has been a long time since I flew a Twin Otter and I think it was a series 100.

So if that was what the manual called for that was the way I operated them.

As close as I can recall the last time I flew a Twin Otter was the winter of 1974/75 out of Johnston Point,

Here is a link to that flight
....................................................................................................

www.ebushpilot.com/arcturus.htm


I must begetting old I guess. :mrgreen:
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pelmet
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Re: Gear's Down - Prop's Fine

Post by pelmet »

Unfortunately…..he didn't say 'gear's down - prop's fine' to himself on final....

C-FRWT, a privately operated Piper PA-24 Comanche, was conducting a VFR flight from Vernon,
BC (CYVK) to Fairview, AB (CEB5) with only the pilot on board. During the downwind leg for
landing in CEB5, the pilot extended the flaps and selected the landing gear down. Unbeknownst to
the pilot, the landing gear did not extend, and a gear up landing was unintentionally performed.
There were no injuries, but the aircraft sustained damage to the propeller and the lower aircraft
fuselage.

Subsequent investigation revealed that the landing gear electric circuit breaker was tripped. The
aircraft was raised, the circuit breaker reset and the landing gear was subsequently extended.
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digits_
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Re: Gear's Down - Prop's Fine

Post by digits_ »

pelmet wrote: Thu Jun 18, 2020 3:50 pm Unfortunately…..he didn't say 'gear's down - prop's fine' to himself on final....
Who says he didn't?
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As an AvCanada discussion grows longer:
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pelmet
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Re: Gear's Down - Prop's Fine

Post by pelmet »

digits_ wrote: Thu Jun 18, 2020 4:24 pm
pelmet wrote: Thu Jun 18, 2020 3:50 pm Unfortunately…..he didn't say 'gear's down - prop's fine' to himself on final....
Who says he didn't?
Maybe he did. Perhaps it involves more than just rote words.
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Last edited by pelmet on Sun Jun 21, 2020 6:20 pm, edited 1 time in total.
co-joe
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Re: Gear's Down - Prop's Fine

Post by co-joe »

C.W.E. wrote: Sun Nov 04, 2018 7:05 pm I have a very simple gear check that works for every airplane I fly.

" Where am I landing and where is my gear "

So far it has prevented me from landing with the wrong gear position twice.
Probably my favourite quote from you of all time. Such a pragmatic thing to say to one's self. So much that I find it coming up in my brain on final and I don't even fly floats.
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iflyforpie
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Re: Gear's Down - Prop's Fine

Post by iflyforpie »

I always put the gear handle down and pop the circuit breaker after I land gear up. ;)
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Geez did I say that....? Or just think it....?
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