Good morning!
both engines are IO-540-E1B5
compressions @ annual were
Left 75, 77, 70, 76, 75, 72
Right 72, 77, 65, 77, 72, 70
times as spec'd in the listing are current times since overhaul.
total engine time is unknown.
Per Engine Logs
1986 both motors were top overhauled.
2002 both engines were sent to Lycoming for overhaul.
2008 AV center performed the overhaul on both engines.
And here they are now. Perfectly smooth running 290hp Lycomings.
Just flew them yesterday. Great performers.
Also note, these are very lightly used engines. Most missions for this particular commander was as an aerial fire command for wild fires. They would sit @ 7k feet doing 140 MPH and do slow right hand circles around the fires.
That equates to 17MP and 2200RPM on the props.
Engines start true every time and no issues what so ever.
The Airplane have been on part 135 Fire service For a very Long Time And the maintenance has been outstanding.
No known corrosion its a dry country aircraft and or Hangared most of its life. Also remember this. Unlike the 500b, the 500s was completely painted with zinc chromate from the factory, due to the corrosion issues of the 500b.
At annual I had every inspection port open and we spent a day just looking around. Mechanic found nothing
However that being said it is a 1971 aircraft and I and my mechanic may have missed something.
At annual this June, the mechanic @ Butler aviation stated that N39GW was quite possibly the most well taken care of Twin commander he has ever seen. Thats quite a statement for a mechanic.. He was very impressed!
The spar is on the standard 36 month schedule. it will be due next annual. No deficiency's have shown up as of now. And I don't expect them to. Like I said. Dry country aircraft.
If you have any further questions let me know and ill try my best to answer them.
