Lycoming, in their prop-strike Service Bulletin 533A, takes the approach that the safest procedure is to take the engine apart for inspection following any incident involving propeller blade damage. TCM's SB 97-6 specifies the mandatory items that must be replaced when the engine is torn down. as a result of sudden stoppage. 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. This AD, defines a propeller strike as follows: (i) For the purposes of this AD, a propeller strike is defined as follows: (1) Any incident, whether or not the engine is operating, that requires repair to the propeller other than minor blade dressing. Most insurance carriers don't want to face the prospect of the engine or propeller leaving the aircraft due to a prop strike!". Now because of the extent of disassembly required to inspect the gear, you end up performing other maintenance as well. Posted at 11:12h in don franklin oil change somerset ky by royal TCM is less equivocal. Dealing with them on this issue is fodder for another article, however. ", Case in point (j) The preceding definitions include situations where an aircraft is stationary and the landing gear collapses causing one or more blades to be substantially bent, or where a hangar door (or other object) strikes the propeller blade. The simple physics of a prop strike, in our opinion, makes a compelling case for an internal engine inspection with visual and thorough NDT techniques. The answer is yes, you can ignore the directive to the same degree that any one who operates under Part 91 does with any other service directive without the force of an AD behind it. the official SGML-based PDF version on govinfo.gov, those relying on it for Some geared alternators shafts use gears that are designed to slip on overloads, but older versions of this alternator gear do not have this design, and the gear shear design is for an alternator failure not a crank stoppage. 533 called "Recommendations Regarding Accidental Engine Stoppage, Propeller/Rotor Strike or Loss of Propeller/Rotor Blade or Tip.". has no substantive legal effect. ", Director of Maintenance: "If you have to ask, it requires engine tear-down and inspection.". This proposed rule does not have federalism implications, as defined in Executive Order No. A slam stop will detune the weights and damage the bushings so they can no longer do their job of helping to balance the crank while operating. As for whether the inspection should be done, Anderson said he couldn't answer for anyone but himself; however, he wouldn't hesitate if it were his engine. The request should include an assessment of the effect of the modification, alteration, or repair on the unsafe condition addressed by this AD; and, if the unsafe condition has not been eliminated, the request should include specific proposed actions to address it. (iii) Maintain a record of each core sample obtained with each rotobroach bit used. 12866. Also, some engines with a gear-driven alternator have a large, relatively thin and very vulnerable gear bolted to the forward end of the crankshaft. 2. All rights reserved. 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. Prop strike on Continental. I've heard that a Continental doesn't require a tear down and inspection as a Lycoming does, but looking at Continental's Service Bulletin SB96-11B it looks Home. documents in the last year, 12 on On April 28, 2000, the Federal Aviation Administration (FAA) issued emergency airworthiness directive (AD) 2000-08-51 that is applicable to Teledyne Continental Motors IO-360, TSIO-360, LTSIO-360, O-470, IO-470, TSIO-470, IO-520, TSIO-520, LTSIO-520, IO-550, TSIO-550, and TSIOL-550 series reciprocating engines. 01/17/2023, 202 Moreover, 43.13-1B mandates the use of approved manufacturer data (providing it exists) rather than 43.13-1B data as the required source of both inspection and repair information (Manufacturer data will be more current with more detail and part specific is the thinking). Since an unsafe condition has been identified that is likely to exist or develop on other engines of this same type design, this airworthiness directive (AD) requires removing a core sample of material from the propeller mounting flange and sending the core sample to TCM for evaluation. However, they have the caveat that the inspecting mechanic may override that position and return the engine to service without disassembly and inspection if he feels that it is the prudent and responsible thing to do. Think of it as the equivalent of a high-speed twist drill, with great resistance to bending-it tends to snap or develop cracks from damage and fails suddenly. (a) For those engines and crankshafts listed by SN in TCM MSB 00-5C, dated October 10, 2000, do the crankshaft material inspection (crankshaft propeller flange core sample) as follows: The engine SN's listed in TCM MSB 00-5C contain only the numerical portion of the SN. That action was prompted by reports of crankshafts on which the connecting rod journals had fractured. To start my investigation, I wanted the official definition of a prop strike. Always rely on the FAA certified inspecting technician, applicable service data and the FARs to dictate how thorough an inspection is necessary to continue the engine in service. This prototype edition of the The MSB also describes procedures for removing a core sample of material from the propeller mounting flange of the crankshaft and for cleaning, chamfering, dye checking, and painting the core sample holes. Pre-Flight. The authority citation for part 39 continues to read as follows: Authority: offers a preview of documents scheduled to appear in the next day's A tear down of most direct drive engines isnt a major repair but we recommend using a certified repair station or the factory for that action as well as the level of NDT testing will be significant and required to be done by certified people for such critical NDT inspections. Emergency AD 2000-08-51 was sent to all known U.S. owners and operators of Teledyne Continental Motors (TCM) IO-360, TSIO-360, LTSIO-360, O-470, IO-470, TSIO-470, IO-520, TSIO-520, LTSIO-520, IO-550, TSIO-550, and TSIOL-550 series reciprocating engines by individual letters. The President of the United States issues other types of documents, including but not limited to; memoranda, notices, determinations, letters, messages, and orders. on Not every prop strike results in sudden stoppage, but it doesn't take much to damage some of these accessories. Although not a guarantee of any kind, the lack of movement showed that utter destruction had not occurred. That said, you'll understand that this article isn't going to state, or even hint at, what you should do in this situation. This year's numbers have placed us in the top 10, highlighting another strong year of property development. stoppage inspection, we are your source for engine While every effort has been made to ensure that At what point after a prop strike do you need an engine teardown and inspection? On severe prop strikes, the mounts can be easily twisted and loaded in a way that it was not designed to withstand," he says. So my question was, should I overhaul the present engine or look for one with good logs? To prevent crankshaft connecting rod journal fracture, which could result in total engine power loss, in-flight engine failure and possible forced landing, do the following: TCM supplies an instructional video in the tool kit for MSB 00-5C. I won't list them all here, but some of the more expensive ones are: hydraulic valve lifters, connecting rod bearings, the crankshaft's main and thrust bearings, all needle, ball, and roller bearings, exhaust valves, valve springs, piston pins, pistons, crankcase through bolts, all the hardware, seals, gaskets, O-rings, and lots of other small stuff. The actions are required to be accomplished in accordance with the service bulletin described previously. PROPELLER STRIKE INSPECTIONS. documents in the last year, by the Veterans Affairs Department In another incident a prop hit a small rock, which had been dislodged and thrown back by a larger aircraft. Basically anything that moves is subject to visual and other forms of nondestructive testing. Say the engine is turning only 1000 rpm, barely above an idle. In this case however, there is an existing AD for quite a few differentLycoming engines that specifically mentions prop strikes and mandates some degree of tear down, but not necessarily a full tear down, and only if it is a prop strike as opposed to a sudden stoppage. The decision was made for me by an advertisement in Trade-A-Plane. Federal Register. 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. documents in the last year, 480 (c) Crankshaft material inspections (crankshaft propeller flange core samples) that were done using TCM MSB 00-5, dated April 14, 2000; MSB 00-5A, dated April 28, 2000; or MSB 00-5B, dated May 25, 2000, comply with this AD and must not be repeated. Compliance with this service bulletin is mandatory per AD 91-14-22. headings within the legal text of Federal Register documents. We have personally seen an instance where a plane lost the entire prop in flight following a so called minor prior strike of hitting a runway light while taxing, but the crank on the IO-520 was only checked for run-out and prop repaired (and this was a Part 135 operated plane). Another thing to look for in the logs is a prolonged period of inactivity, such as years between annual inspections and oil changes. Factory New & Factory Rebuilt Gasoline Engines +1.251.436.8101 08:00 - 17:00 Gasoline Engine Overhauls & MRO +1.251.990.5080 08:00 - 17:00 Technical Support (AvGas & A. Inspect all engine driven accessories in accordance with the manufacturers maintenance instructions. (b) After the effective date of this AD, do not install a crankshaft with a SN that is Start Printed Page 70656listed in MSB 00-5C, dated October 10, 2000, unless core samples have been taken and TCM has approved it for return to service. As mentioned earlier, Advisory Circular 43.13-1B, Chapter 8 defines a sudden engine stoppage as stopping an operating engine in one revolution or less for any reason, period, and includes prop-strike damage as a subset of the of sudden stoppage definition (at least the way we interpret the way it is written). But it's getting harder Following any propeller strike, complete disassembly and inspection of all rotating engine components is mandatory and must be accomplished prior to further flight. better and aid in comparing the online edition to the print edition. There may be other additional requirements mandated by insurance policies or engine manufacturer and/or overhauler warranty. After the extent of the inspection has been determined, it is important, as with any major repairs that are accomplished on your aircraft, to find out exactly what is included in the estimate to repair your engine following a prop strike. You could identify its sound with your eyes closed. Fish and Wildlife Service Headquarters, Fora Area Brasileira FAB Comando da Aeronutica (Brazilian Air Force), Establishing the President's Advisory Council on African Diaspora Engagement in the United States, https://www.federalregister.gov/d/00-29496, MODS: Government Publishing Office metadata. (1) Do the crankshaft material inspection (crankshaft propeller flange core sample) in accordance with sections A through J of TCM MSB 00-5C, dated October 10, 2000, as follows: (i) Use the specialized tools and equipment provided by TCM as listed in section A of TCM MSB 00-5C, dated October 10, 2000. 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