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Hartzell prop hub AD 2006-18-15...results and our options
I found out a few months back that we're affected by the recent Hartzell
prop hub AD...requires an eddy current inspection on the front half of the hub within 50 hours TIS then every 100 thereafter *or* annual, whichever comes first. So I made it to the prop shop this week and the good news is that we have no cracks in the hub. The not so good news is that going the route of replacing the hub doesn't make sense for us as we might/might not have another overhaul remaining on our current blades. The prop is original and has three overhauls on it. The shop took some measurements and it was close enough to minimums that they wouldn't know for sure unless the paint was stripped and measurements were taken with the prop off the plane. If we do have one overhaul remaining, we'd be looking at just north of 4 AMUs for a new hub and an overhaul. That's a ton of cash to sink into a prop with a pair of last run blades. Another option would be a reseal vs. overhaul (along with a new hub)...but we'd still be paying approx. 1/2 the price of a new 2-blade prop. Next option, repetitive 100 hour inspections. The inspection costs $300 and it's $50-$60 in gas for a round trip to the shop. By the time you eat two hours off the engine reserves (which is how we handle maintenance flights), this gets expensive over the long haul. We're 1000 hours from the recommended TBO from Hartzell (2000 hours or 72 months...and we're at 96 months SPOH). Another 1000 hours on the prop would mean $3500-$3600 down the drain for repetitive inspections and we'd still need a new prop someday. Nah...at some point before the next overhaul, we need to consider a new prop. Next (and most expensive up front) option, a new prop. The quote from the shop for a McCauley 2-blade prop/hub/parts to use our existing spinner was 7.002 AMUs. This is with trade-in on our current hub and blades but doesn't include installation. I didn't get quotes on Hartzell props nor for a 3-blade McCauley. While I like the looks of a 3-blade, IMHO, the added up front cost and increased overhaul costs don't justify the performance benefits. Plus, I've read from a few Arrow/Lance owners that while they get improved climb performance and less RPM limitations, they lose a few kts. in cruise. Added weight is about 10 lbs for the McCauley so that's not a big deal. So, now it's time for the partnership to ponder our options. I'm betting that we decide on repetitive inspections and to up the per-hour costs a tad in order to stash some extra cash away for a new prop. Our existing prop is in good shape so we should have a few years to save up. As JayH said, it's always something :-) If someone sees Santa, would you pass along that I'd like a new McCauley B2D34C213 prop (Piper part # 550-974)? Merry Christmas all. Here's to hoping Santa brings you some cool flying toys, maybe some good flying weather, or, perhaps sends the elves to fix the plane in the middle of the night. -- Jack Allison PP-ASEL-Instrument Airplane "To become a Jedi knight, you must master a single force. To become a private pilot you must strive to master four of them" - Rod Machado (Remove the obvious from address to reply via e-mail) |
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