Well, its one of those how long is a piece of string questions.
550 hours, depending on how many hours a year you do (I work on machines that are used commercially/flying school so they do a fair bit) but you might be up for any of the following:
*Gearbox oil drains/flush/refill. Due at first 100 then every 500 so you are only 50 hours off
* Lycoming SB388 valve guide check. Its due every 300 hours but should be done 100 hours after new or O/H engine so if it was done at 100, it wont be due again until 700. If it is due (at 600 hrs) then you may be up for a bit of labour if they need reaming. How are your warm downs?
* Lower clutch bearing lube. Again its a 300 hour item so will be due at 600, not an issue and only a 10 minute job on the 44
*Unless done previously, I'd expect some of the rotating parts up in the swashplate/head area to be starting to wear at around your hour mark. Might be ok, but again might need some adjusting of the upper/lower scissors.
* Engine baffles. Always crack on RII's but most can be repaired/replaced cheaply.
* How is your engine driven fuel pump? Puddle of oil under the a/c when its parked in the hangar from the clear plastic drain tube? (there is a thread on this forum I think) they are quite good, but I've seen a fair few starting to fail at around the 5/6/700 mark.
*All SB's done? Sprag Clutch SB79. Expensive if it fails that.
Those are just a few things off the top of my head. Hopefully it'll be a very straightforward annual and you'll have it back soonest. All the best.
