iPat wrote:I looked on Barnstomers and found a $110k Maule MXT-7-180A sn 21084C for sale.
TCDS 3A23 reveals two approved Lycoming engines: O-360-C1F or O-360-C4F, and
two approved propellers: Sensenich fixed pitch 76EM8S5-0-56 or 76EM8S8-0-56, both 76 inches diameter with No reduction permitted.
"Up" is a nice option, and "Up quicker" requires more horsepower and/or a different prop.
No mention of a Lycoming O-390-series anywhere in TCDS 3A23, and a search of STC's was similarly unrevealing. So likely a field-approval, tho there may be an STC in process, or perhaps Maule themselves are working on certificating same.
Which leaves the propeller: Recommend ensuring a CS prop can be retrofitted per the STC, or via an approved Maule process/drawing/kit/etc.
Have fun!
Yes, that's the one I'm talking to the seller about. I have second dibs on it. Hoping he gives me the go ahead to come out and look at it.
I've also looked at the TCDS, and am puzzled by why he claims it had been originally built as an MTX7-180C, not an "A" as it is now. I asked him for scans of any 337's that were in his logs, and he asked what 337's are. Puzzling. He was told by his IA at his first annual that it had previously been a constant speed model. I see no extra hole in the panel that had been plugged over. Who knows. If it's in the condition it appears to be in from the photos, and the logs are good, I'll buy it if the other guy doesn't.
As far as O-390, just a dream, I'd be happy with this aircraft as is. But, my thought is, after looking at the STC's Lycoming has for the 390, it appears they are adding a lot of airframes originally equipped with O360's and O320's. There are not as many Maules out there, especially O360 Maules, so it's probably not on the top of the list to add. If I have the money at overhaul time, I'd probably try for a field approval and see where it goes. But again, I'd be happy with the aircraft as is.
D.