PT6-11

[nookie201]

Hi, does anyone know if the PT6-11 is a reliable engine ?, known problems with them ?
Stay away from or OK engine?. Hot sections verhaul expensive ?

Average fuel burn ?

-G

[longjon]

Hmm 100 looks but no replies

I can;t say Ive had experience on a -11 and to tell the truth I've never heard of a -11 till now and after a quick look on the P&WC site I see its on a AG ac,is this right?

The only PT6 I know of with poor support is the old -6 but someone please correct me,, for info I'd call a tech rep, did you try Bruno at P&Wc Montreal?
Hes a real jem.

Its a PT6, it will run forever, just keep the nozzles clean.

[TwinOtterLover]

the old -20's are starting to lose support too, we have a turbine overhaul place and they dont want to touch the -20's anymore, good thing only one bird in the fleet has them

[PanEuropean]

I think that most aircraft that were originally fitted with -20 or prior model engines now have STCs available (from a variety of people, not the OEM or the engine manufacturer) to fit either a -27 or a -34 in place of the original engine.

The -20 and predecessor engines were among the very first engines in the PT6A series, and they were not known for having much margin on them even when they were fresh out of the can. The metallurgy was rather primitive in those first series of engines.

Assuming that an STC exists to fit a -27 or -34, it's probably in your financial best interest to consider fitting the newer model engine when TBO arrives on the older one. You won't be able to extract any more power out of the newer model engine (the same SHP and torque limitations will apply), but you will benefit from massive flat rating of the new engine - that will greatly reduce the costs of your future HSIs and overhauls.

Michael

[nookie201]

Thanks for the replies guys, the PT6-11 is also fitted on a Cheyenne I, 500HP (Flatrated).
It's also found on Caravan as 675HP engine as PT6-11A

Best I can find is it's essentially a -27 derated to 500HP.

I am looking around to purchase a Cheyenne I or II, found fairly reasonable prices on some,
but PT6 quality and support on older PT6 models requires consideration.

I'm looking to buy one with approx 600 - 800hrs left on the engines before OH or HSI.

From some reading there's new PT6's out there now with no HSI event, problably the way to go after engines time out.

-G

[PanEuropean]

...Best I can find is it's essentially a -27 derated to 500HP...-G

Uh, unless the -11 has the same temperature limits as the -27 (660° idle, 695° cruise, 725° takeoff), then it's not a 'de-rated' -27. I am going to guess (this is a guess, but an educated one) that the -11 is a forerunner of the -27, and the -27 has better metallurgy than the -11.

...From some reading there's new PT6's out there now with no HSI event, probably the way to go after engines time out.-G

The PT6A family of engines has three different physical sizes. The -34 and smaller comprise the 'small' PT6A series, and are all about the same physical size, and all about the same weight. This is why there are so many STCs out there enabling the later production designs (-27, -34) to be fitted to aircraft that were originally fitted with -6, -11, and -20 engines.

I am not aware of any small PT6A engines that do not have a scheduled HSI event. The idea does not make economic sense - the HSI is a mini-overhaul of the center (hot) section of the engine that enables you to achieve a much longer TBO that would be possible without a HSI. If you put the engine on trend monitoring the day it comes out of overhaul, then you can do your next HSI 'on condition' - but you can't escape the HSI completely, and I doubt if you would want to.

Michael

[Bullet Remington]

Check pm

Thanks for the replies guys, the PT6-11 is also fitted on a Cheyenne I, 500HP (Flatrated).
It's also found on Caravan as 675HP engine as PT6-11A

Best I can find is it's essentially a -27 derated to 500HP.

I am looking around to purchase a Cheyenne I or II, found fairly reasonable prices on some,
but PT6 quality and support on older PT6 models requires consideration.

I'm looking to buy one with approx 600 - 800hrs left on the engines before OH or HSI.

From some reading there's new PT6's out there now with no HSI event, problably the way to go after engines time out.

-G

[nookie201]

-27 , sorry that was a typo, what I found on the web was it's a -21 derated too 500HP.

I know nothing about PT6's so I'm trying to puzzle some information together and get info from here as it's a great source of information. Thanks again.

-G

[Louis]

Careful: the Caravan has the -114 (600 shp) or -114A (675 shp). Not the -11.