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On Sun, 18 Apr 2004 18:17:24 -0700, Jim Weir wrote:
snipped for length, not for content. On the other hand, they have to pull it apart anyway, so why not just do the overhaul for the price of a couple of hours of labor and some dollar parts? Was lucky to have a prop shop next door for a few years, will only add a few thoughts. On the older McCauley's, at overhaul, the blades have to be unscrewed from the ferrules (sp?) and inspected. The longer it has been since this has been done, the more difficult it is, and the more likely you are to find problems. The newer McCauley hub designs are stone-simple and relatively easy to o-haul. The only real down side would be blade rework/inspection (material removed working toward min specs). I would agree that on a McCauley in most cases overhaul would be the way to go. If you've got a common compact hub Hartzell (not applicable in this particular case), "overhaul" means they have to roll the blade shanks near the butt and then polish to remove the roll "marks". There is also a min. diameter for the blade shanks. As above, there are also requirements for blade rework (accompanied by another set of min specs). For 91 operators, I've always recommended a 5 year (max) tear-down, hub corrosion inspection, and re-seal. FWIW, there were always a lot fewer scrapped parts coming out of the McCauley end of the shop than the Hartzell end. Corrosion from infrequent inspection/improper lubrication being the primary issue. Never saw a corrosion problem inside the Hartzell props on "working" airplanes (greased every 100 hrs/2-3 months, o-hauled every 3-4 years). Always thought that a grease job every 100 hrs/6 months (regardless of hours in the air) would be a good idea for relatively in-frequent flyers. TC snip |
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In article ,
wrote: Never saw a corrosion problem inside the Hartzell props on "working" airplanes (greased every 100 hrs/2-3 months, o-hauled every 3-4 years). Always thought that a grease job every 100 hrs/6 months (regardless of hours in the air) would be a good idea for relatively in-frequent flyers. Should grease be added until it flows cleanly from the removed zerk side, or just until "some" grease comes out? -- Ben Jackson http://www.ben.com/ |
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On Sun, 18 Apr 2004 22:58:58 GMT, DP wrote:
follow up This was a new prop back in 1994/5 (don't have my logs right here). The last owner bellied it in so the engine was overhauled and a new prop put on. I didn't see any overhaul tags anywhere for this prop, but I KNOW nothing has been done to it the last three years I've owned it. My A&P said today the prop "appears" fine, and it should only need new seals, but we won't know until Friday when the prop shop takes it apart. I took it off the plane this morning, and the prop shop is picking it up tommorow as they have other to drop off/pick up. The A&P tells me between 3-5K for an overhaul, and that the blades are in great shape. We'll see I guess. I'll post more when I find out more. Don Paquette PP-ASEL N9723X |
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