A propeller strike (according to this Lycoming bulletin) is defined as follows:(It has all the same definitions found in AD 2004-10-14 that we printed in italics but has additional information): Circumstances which surround accidents are many and varied; therefore, the circumstances of the accident can not, in our opinion, be used to predict the extent of the damage to the engine or assure its future reliability. So, in a roundabout way by the last paragraph, Lycoming is saying its the repair facilitys call unless your engine is one found in the later AD 2004-10-14, which applies to a lot of Lycoming engines. How much liability insurance do you have? Note the recurring theme of the loss of rpm or sudden stoppage of the engine runs as a key criteria for an internal inspection among the makers as well as the FAA. It still could end up at a prop repair station if inspection deems it a prop major repair requirement depending on manufacturer inspection criteria of the prop. The degree of difficulty of this action will bevaried, depending on the installation and location of accessories, turbos, intercoolers, etc. Although this action is in the form of a final rule that involves requirements affecting flight safety and, thus, was not preceded by notice and an opportunity for public comment, comments are invited on this rule. Following any propeller strike, complete disassembly and inspection of all rotating engine components is mandatory and must be accomplished prior to It is important to note that mandatory compliance with this AD is required as indicated before further flight if the engine has experienced a propeller strike as defined above, but per the compliance section of the AD it does not require compliance in the event of a sudden engine stoppage with no prop damage such as hitting tall grass. Compliance with this service bulletin is mandatory per AD 91-14-22. The AD specifies the inspection at each engine overhaul, after a propeller strike, sudden stoppage, or whenever gear train repair is required. Lycoming's new SB seems to generalize the term propeller strike and sudden stoppage to be quite inclusive. On severe prop strikes, the mounts can be easily twisted and loaded in a way that it was not designed to withstand," he says. The one that came with the airplane had passed TBO (time between overhauls) but its logbooks didn't go back to when it came from the factory. by the Federal Energy Regulatory Commission FAA# JL4R288M | EASA.145.4115 | Toll Free: 800-282-3202 | 954-970-3200 (2) Any incident during engine operation in which the propeller impacts a solid object that causes a drop in revolutions per minute (RPM) and also requires structural repair of the propeller (incidents requiring only paint touch-up are not included). Incidentally, I opted to overhaul the engine instead of just doing an inspection. Lycoming is particularly concerned with this area and outlines specific inspection criteria with the force of AD 2004-10-14 to support their bulletin SB 475C depending on engine model. better and aid in comparing the online edition to the print edition. corresponding official PDF file on govinfo.gov. Recent changes in the approach to propeller strikes dictated by Airworthiness Directives, engine manufacturer Service Letters, and insurance company policy have made anything less than a thorough teardown and NDT inspection unacceptable. Prior to any ground operation of the engine assure that the propeller flange and the crankshaft flange area are free of any crack indications in addition to the engine component inspection. (iv) Do not exceed the torque limits specified in TCM MSB 00-5C, dated October 10, 2000, when obtaining the core sample. Recently, a transient aircraft hit a rubber traffic cone with the prop and kept going, taking off and disappearing into the western sky. He used a football analogy of a player who can be brutally tackled and get right up, then trip over a bucket and break his leg. DeJoris, who deals with propeller strike issues quite frequently says, "We recently had a customer with a prop strike who struck a steel stake that cut 1/4-inch of the tip off one blade of a three bladed prop. Schwaner made the point that more than a few people have been told their engine's crank is bad, but it just so happens that the shop has the one you need in stock. ", DeJoris adds, "As a result, there is no real relationship today between the extent of damage of the prop and the type of inspection that has to be done to the engine. continental prop strike ad continental prop strike ad. Should he also have performed the obligatory engine inspections? AOPA Members DO more LEARN more SAVE more - Get MORE out of being a pilot -. (2) Any incident during engine operation in which the propeller impacts a solid object that causes a documents in the last year, 534 A prop that hits so hard as to bend the crank flange is only one of several considerations. Our designation as a Cessna Service Center and authorization as a parts and engine distributor for both Lycoming and Continental MSB 005C lists additional serial numbers (SN's) of affected engines and suspect crankshafts that were manufactured between April 1, 1998, and March 31, 2000, inclusive. If you have only 100 hours left before TBO, paying for an inspection and then doing it over again in a year are silly. We will not be discussing damage to the prop in this article since there is so much information on prop damage that does not involve engine tear downs. There's also the cost of inspection of the accessories, which is extra. Even tip damage is considered cause for teardown Posted at 11:12h in don franklin oil change somerset ky by royal In another incident a prop hit a small rock, which had been dislodged and thrown back by a larger aircraft. Moreover, the crank is not the only critical element in a prop-strike incident. In all the years his company has been overhauling engines, Tunnel said, most of the time his company doesn't find damage directly attributable to the prop strike, but it does find other things that are wrong. "The result is that those flyweights that are hanging on by 1/8-inch pins can easily bend, twist, or damage those pins. Information about this document as published in the Federal Register. Maybe it is and maybe it isn't." Register documents. Panagotacos recently paid $66 for the list of a 1956 Cessna 182, which is in his shop. Located in Burlington, North Carolina, we provide an array of aircraft maintenance services, including engine, cylinder, and propeller overhaul and repair. I alluded to the potential of buying an airplane that suffered a prop strike without the required inspections being completed. Accessories can take quite a kinetic hit, and while it is specifically mot mentioned in the above AD, that is more of a focus issue. Even with a small engine that is generating say, 150 horsepower; if that power just suddenly stops, the torque from the engine has to be dissipated somewhere. Over the years, Continental has built a service offering for aircraft operators and owners These services include engine overhauls at the Continental factory service center for Continental, Titan, and LYCOMING engines, factory overhauls for Continental AvGas engines, sudden stoppage/propeller strikes, shock inspections, fleet overhaul programs, Jet-A burning engine We get e-mail from readers who have had what they often prefer to call prop incidents as to possibly avoid the term prop-strike, and its frequent need for a recommended or mandatory engine tear down. Secure the airplane and figure that it will be out of commission for a few months. Comments for inclusion in the Rules Docket must be received on or before January 26, 2001. During the subsequent takeoff, the airplane's right wing hit the mirror of a semitruck, which veered the airplane into a fire truck and eventually a ditch. The President of the United States issues other types of documents, including but not limited to; memoranda, notices, determinations, letters, messages, and orders. Inspect all engine accessories in accordance with the manufacturer's instructions.". To start my investigation, I wanted the official definition of a prop strike. As he approached the director of maintenance he asks, Pilot: "When does a prop strike require engine tear-down and inspection? K. kevmor99. Second, any time foreign object damage requires propeller removal for repairs other than the minor dressing of the blades as mentioned above, the incident is considered a propeller strike and must be inspected as outlined in SB 96-11B. AC 43.13-1B has lots of general information in Chapter 8 on prop strikes. In fact, the customers were sold their own crank. The argument goes would you rather be paying for an in flight engine failure 100 hours from now. Continued evaluation of crankshafts lots with serial numbers (SN's) other than those that were listed in AD 2000-08-51, has detected the same condition in those crankshaft lots. A Rule by the Federal Aviation Administration on 11/27/2000. After defining a prop strike, TCM's SB 96-11A states: "A. Propeller strike inspections. Following any propeller strike complete disassembly and inspection of all rotating engine components is mandatory and must be accomplished prior to further operation. Inspect all engine accessories in accordance with the manufacturer's instructions." Prop strike. These two words are guaranteed to make any pilot wince. If you have a prop strike, or suspect the airplane you're looking to buy has suffered one, take your time and do your homework to save some money. The general consensus is that at least some degree of tear-down is the only safe option under their definition, and largely follows manufacturer data in the general damage/repair evaluation techniques. Basically the fuel gauges in the center console are shorting out. Dye Penetrant test didn't show any cracks on the flange, runout is .001 which is well within tolerance. On November 24, 1999, the FAA was notified of a crankshaft failure on a TCM engine. We dont have such trust unless we know a whole lot about who we are dealing with and have all the proper logs and background checks-especially in the Internet age there is no excuse to not do a lot of digging on who and what you are dealing with. The engine for sale was the model I needed, with about 1,000 hours since a factory overhaul. Some elbow room? Propeller strike inspections. Others will pay for all costs for the inspection and for any parts needed due to the incident. Includes: Fuel Injection Spyder Starter Alternator Bendix Magnetos Gamijectors I will be more than happy to ship this engine to you. for better understanding how a document is structured but A prop-strike also imposes terrific jamming forces backward on the rear of the case-where the gearing is located and easily damaged. Sure, some of these arguments are specious, but the point is, there's a lot of gray area, and this can cause many incidents to be ignored. We can even see situations where a prop sustains a fairly nasty nick in a gravel strip, but no rpm loss occurs or serious blade damage occurs. These cases should be handled as sudden stoppages because of potentially severe side loading on the crankshaft flange, front bearing, and seal.". Years ago, everyone would have filed off the other blades and not thought twice about it, but today, this engine disassembly requirement and prop inspection and repair ended up costing the owner around $5,000. That said, you'll understand that this article isn't going to state, or even hint at, what you should do in this situation. According to DeJoris, "Hartzell requires hub replacement if any blade in the assembly is bent beyond repair limits due to impact damage. Propeller inspections are fairly clear cut damage on the blades is typically quite apparent, and the existence of damage beyond field repair limits dictates that the unit is disassembled and given a searching internal inspection, and in some cases, complete overhaul. 12866. Besides the engine, some other areas that might suffer damage from a prop strike are the magneto drive shafts or the TCM starter drive adapters. documents in the last year, 90 TCM SB 96-11B defines a propeller strike as follows, and we paraphrase: First, any incident, whether or not the engine is operating, that requires repair to the propeller other than minor dressing of the blades, for instance where the propeller is damaged by a small foreign object during operation, such as a small stone. 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