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16 Nov 2018, 05:59 [ UTC - 5; DST ]


Greenwich AeroGroup



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 Post subject: TPE-331 Salt Air Desalinization/Compressor Wash Schedule
PostPosted: 06 Oct 2018, 09:40 
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Joined: 12/12/10
Posts: 210
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Company: PLANELOGIX
Location: Chapel Hill, NC
Hey guys,

Does anyone have experience operating a TPE-331 in a hot and humid salty environment for a prolonged period of time (i.e. the Florida coast)? I'm interested to learn more about procedures and precautions taken (if any) to prevent engine corrosion while based and operating along the eastern seaboard. Did anyone follow any sort of compressor wash and desalinization schedule? Maybe my Google-fu isn't strong right now, but I'm not finding much in the way of practical advice.

Honeywell Says You Do not Need Compressor Washes, but is this applicable to salt air environments like those found in Florida? Just curious...


Thanks,

Rob

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PLANELOGIX: Always online and available. Aircraft record ecosystem https://www.planelogix.com


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 Post subject: Re: TPE-331 Salt Air Desalinization/Compressor Wash Schedule
PostPosted: 06 Oct 2018, 10:13 
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Location: San Carlos, CA - KSQL
Aircraft: Mitsubishi MU-2B-40
For better or worse, I don’t do them (since Honeywell doesn’t recommend them). My hangar sits at roughly 3’ MSL and 100’ from the SF bay, my hangar floor grows salt when the tide is high and it rains at the same time. So.... :shrug:

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 Post subject: Re: TPE-331 Salt Air Desalinization/Compressor Wash Schedule
PostPosted: 06 Oct 2018, 10:48 
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Joined: 12/19/09
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Company: Premier Bone and Joint
Location: Wyoming
Aircraft: BE90,HUSK,MU-2
When I bought my MU-2 I asked Honeywell about this and they told me that compressor washes are not necessary and not permitted. Not sure what that last part means if they are not in warranty period but that’s what I was told. I live at 7600 feet in the dry Rockies so it may not apply anyway. We have done compressor washes on our KA’s PT-6 engines on the recommendation of our maintenance provider. Don’t know why free turbines get washed and TPE’s don’t.

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Thomas


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 Post subject: Re: TPE-331 Salt Air Desalinization/Compressor Wash Schedule
PostPosted: 06 Oct 2018, 16:13 
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Company: PLANELOGIX
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Thanks for your input, guys. It now makes sense why my search results were so limited. :cheers:

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PLANELOGIX: Always online and available. Aircraft record ecosystem https://www.planelogix.com


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 Post subject: Re: TPE-331 Salt Air Desalinization/Compressor Wash Schedule
PostPosted: 06 Oct 2018, 16:21 
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Joined: 08/09/11
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Location: KAPF KPIA
Aircraft: AC90 AC50
Compressor washes are a Pratt thing as is the super expensive repair should you not adhere to the inconvenienent schedule of doing them frequently. It’s amazing how robust and user friendly the 331 is relatively in this regard. And it’s a great point of interest as I don’t understand the metallurgy but sure believe the economics.


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 Post subject: Re: TPE-331 Salt Air Desalinization/Compressor Wash Schedule
PostPosted: 06 Oct 2018, 23:50 
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Joined: 04/19/09
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Location: Montego Bay, Jamaica W.I. (MKJS)
Aircraft: Baron B55/Cessna 140
Rob,

The TPE-331 compressor design slings most of the salt away from impeller and the t-wheels and burner take care of the rest - we had our MU-2 parked for 18 years with in 100 yards of the sea - Regular airframe washes and Corrosion X treatment we never had problems with corrosion on any of our airplanes.

BTW the TPE-331 Engine case is magnesium but you don’t hear horror stories of 331’s need their cases changed for corrosion.

Our PT-6 AG Planes had some blade sulfidation but that’s typical of PT-6 ... installed new blades at HSI and ran higher ITT - problem solved

TPE-331 are very damage resistant- repaired one with 3 bent 1st stage compressor blades - it flew in, but you could hear the inlet howling from about 5 miles on final.

You more have to worry about Stators cracking ; ITT probes and scav Pump seals on pre -10 Engines than corrosion.



Regards,
Nigel


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 Post subject: Re: TPE-331 Salt Air Desalinization/Compressor Wash Schedule
PostPosted: 12 Oct 2018, 23:12 
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Company: retired corporate mostly
Location: Chico,California KCIC
Aircraft: None currently
Quote:
Our PT-6 AG Planes had some blade sulfidation but that’s typical of PT-6 ... installed new blades at HSI and ran higher ITT - problem solved


I was at another operator's strip when they were done spraying. Their Turbine thrushes had a wash ring installed. While they were tying down, their swamper hooked up the wash tank. They used a soap solution with diesel in an agitator, which got pumped into the wash ring to flush the engine.
The agitator didn't work, but he started pumping anyway, while the pilot stood on the wing and motored the engine.

Unfortunately he hit start instead of motor, and when it got to the diesel...….
Holy crap, it almost pulled out of the tiedown, pilot switching off and pulling on the throttle.... it quit when the little wash tank emptied.
35+ years ago...

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Jeff

soloed in a land of Superhomers/ Cessna 150, retired with Proline 21/ CJ4.


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