View Full Version : PT6A Difference's
pssincl
19th Jan 2006, 04:53
Hi all,
Hopefully this is the right spot. Might someone be able to tell me the difference’s between the PT6A – 41 and the – 42. Have not been to find anything so far in my searches wrt to this question :confused: .
Cheers
pssincl
vapilot2004
19th Jan 2006, 06:03
From my King Air days I recall the -42 having a higher ITT rating which I think were due to ducting changes and (mostly) a higher-spec hot section. Impoved the above-STD hot days and climb performance of the big lovely.
Cheers
halas
22nd Jan 2006, 11:51
Many years since l flew the beast. The mob l worked for had nothing but -41's, except on the contract aircraft l was on with the -42's
If l remember what the engineers said, it was the ability to operate with hotter temps. This was accommodated by the single-chrystal turbine blades. l guess that means the -41 had multi-chrystal blades. But otherwise the motors were much the same.
We also had the hydraulic under-carriage which was a nice touch too.
halas
His dudeness
22nd Jan 2006, 13:34
ITT Redline -41: 750°C (KingAir 200)
ITT Redline -42: 800°C (KingAir B200)
Both torque redlined at 2230 ft/lbs.
Thus more power vailable at higher levels.
I think the fuel purge system is also different. (-41 Tank and Pump, -42 P3 Air System)
pssincl
22nd Jan 2006, 14:11
Thanks all for the replies,:ok:
…. After a bit more hunting around I have also found out that that the –42 has a 12% (or there about) larger compressor section giving a max operating altitude of 35000’ and cabin diff. of 6.5 psi (compared to the –41’s 30000’ and 6.1 psi).
Cheers,
PSSINCL
halas
22nd Jan 2006, 14:43
Highest l got one was 31,000' and nearly sh@t myself when the FO's windscreen cracked.
T'was a dark night just before Christmas, from Tulla to Orange with wicked storms every where, aaargh.......
halas