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. on Some reports are quite specific about a recent prop strike in the engines history. Sticking with a certified repair facility possessing all the skills and tools will probably reduce the extra shipping costs and time involved to get individual parts examined seems most efficient to us. documents in the last year, 117 01/17/2023, 202 But what is a prop strike and what exactly are the ramifications? There is also a measure of anecdotal evidence in the engine accident/incident statistics that engines that have a prop strike/sudden stoppage and owners who did not follow the manufacturer recommendations such as only checking the crankshaft run-out, have a higher incidence of broken cranks or other engine failures a number of flight hours later. Below are three important links from the FAA, Lycoming, and Teledyne Continental regarding the definition of a Prop Strike and sudden stoppage. documents in the last year, 12 Steve Whitson, AOPA 593652, of Perris, California, has more than 3,000 hours and owns a 1977 Cessna 210. 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. Still others will only pay for the labor to do the job and will not pay for any parts. Are any of the engines accessories inspected as they should be, and if so to what extent? This Airworthiness Directive (AD) is applicable to 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 that were assembled, rebuilt, or overhauled using a crankshaft that was manufactured between April 1, 1998, and March 31, 2000, listed by engine and crankshaft serial number (SN) in TCM Mandatory Service Bulletin (MSB) 00-5C, dated October 10, 2000. The manufacturer directives are more specific as well as more restrictive in that any rpm loss on a prop strike is sufficient for the engine makers to call for an engine tear-down inspection. Its entirely possible after a sudden engine stoppage for there to be severe internal damage and yet the prop looks perfectly OK even if the prop was either totally stopped or the rpm dropped by the incident. These can be useful 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 minor propeller repair must be accomplished in accordance with the propeller manufacturers published instructions (if it exists) for the minor damage preferentially over more general AC 43.13-1B with the exceptions we noted earlier). Teledyne Continental Motors has a slightly different approach, but not much different in practice. 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. Studies have shown that a 100-amp alternator can impose a. The FAA has determined that all of the defects were due to unique material composition characteristics combined with process control variations that occurred during the material melt process. This repetition of headings to form internal navigation links SENSENICH WOOD PROPELLER COMPANY LOCATED IN PLANT CITY, FL. This amendment requires removing a core sample of material from the propeller mounting flange of certain crankshafts, and sending the core sample to TCM for evaluation. 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. If possible, he suggests, mark the flange somehow, or take a photo of the scratches and nicks so you can compare it to the "new" one later. A. Inspect all engine accessories in accordance with the manufacturer's instructions.". At Unlimited Aero Engines we know that things happen, and happen fast. 600-ft lb load on the crank gear on a sudden stop from 1000 engine rpm. Recently, a transient aircraft hit a rubber traffic cone with the prop and kept going, taking off and disappearing into the western sky. Phone: (813) 752-3711 For example, how much propeller filing constitutes "minor dressing?" Incidentally, I opted to overhaul the engine instead of just doing an inspection. What other services or inspections are being performed at the same time as the inspection? Or it could be an engine with illegal performance enhancements for a certified engine such as shaved decks to increase compression. regulatory information on FederalRegister.gov with the objective of PROPELLER STRIKE INSPECTIONS. Section 39.13 is amended by adding the following new airworthiness directive: 2000-23-21 Teledyne Continental Motors: Amendment 39-11994. 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. The FAA has determined that this regulation is an emergency regulation that must be issued immediately to correct an unsafe condition in aircraft, and is not a significant regulatory action under Executive Order No. 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). The investigation revealed that the crankshafts failed due to subsurface defects in the number one crankshaft connecting rod journal. This document has been published in the Federal Register. For engines that have been modified, altered, or repaired so that the performance of the requirements of this AD is affected, the owner/operator must request approval for an alternative method of compliance in accordance with paragraph (d) of this AD. He continues, "T.C.M. I took the ad to an engine overhaul shop, Corona Cylinder and Engine Overhaul in Corona, California, and had the owner, Joe Anderson, call the person selling the engine. Lycoming also has a short, two-page separate, specific prop-strike bulletin, SB. They are often ignored in the prop-strike evaluation, yet they have prescribed inspection criteria even if involved in only a sudden stoppage. Commenters wishing the FAA to acknowledge receipt of their comments submitted in response to this notice must submit a self-addressed, stamped postcard on which the following statement is made: Comments to Docket Number 2000-NE-16-AD. The postcard will be date stamped and returned to the commenter. Replace the rotobroach after the sixth core sample, or before if the rotobroach does not cut with the maximum torque applied. 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. Service Bulletin 533A has the pertinent Lycoming prop-strike definitions for all Lycoming direct drive engines. Another thing to look for in the logs is a prolonged period of inactivity, such as years between annual inspections and oil changes. on 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. AOPA Members DO more LEARN more SAVE more - Get MORE out of being a pilot -. 12866. A propeller strike is: (1) any incident, whether or not the engine is operating, that requires repair to the propeller other than minor dressing of the blades as set forth in Part I, B of this Service Bulletin or (2) any incident while the engine is operating in which the propeller makes contact with any object that results in a loss of engine RPM. Putting the puzzle together (2) Any incident during engine operation in which the propeller impacts a solid object that causes a 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. As he approached the director of maintenance he asks, Pilot: "When does a prop strike require engine tear-down and inspection? TCM is less equivocal. Both major engine manufacturer's have service literature that explains the desired course of action after accidental propeller damage and, in the case of Teledyne Continental, defines what their interpretation of a propeller strike is.". (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. The engine SN can be found in logbooks or other maintenance records. 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. Note 10: 2400 hours TBO may apply. K. kevmor99. Docket 2000-NE-16-AD. We know of no ADs on TCM engines in this area to muddy the waters, so its the owners decision unless they are operating other than under Part 91, such as Part 135 where compliance with service directives is typically mandatory. 00-29496 Filed 11-24-00; 8:45 am], updated on 4:15 PM on Tuesday, January 17, 2023, updated on 8:45 AM on Tuesday, January 17, 2023, 142 documents The President of the United States communicates information on holidays, commemorations, special observances, trade, and policy through Proclamations. New Documents To comply with AD 2004-10-14, if it applies to your engine, the engine does not need to be completely disassembled and access to the accessory gear train can be accomplished, in most cases, with the engine still installed in the aircraft. A copy of it, if filed, may be obtained from the Rules Docket at the location provided under the caption ADDRESSES. How much more time before overhaul is remaining on the engine? Lycoming 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. This damage can result in catastrophic engine failure. If it has, and there's no indication in the engine logs about a teardown and inspection, it's time for a long explanation from the seller. documents in the last year, 1487 You will also find additional info detailing prop damage repair, minor to major, irrespective of any of the prop strike consideration. Conditions 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. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); WORLD'S PREMIER INDEPENDENT AVIATION NEWS RESOURCE. There's also the cost of inspection of the accessories, which is extra. Located in Burlington, North Carolina, we provide an array of aircraft maintenance services, including engine, cylinder, and propeller overhaul and repair. PROP STRIKE. Comments are specifically invited on the overall regulatory, economic, environmental, and energy aspects of the rule that might suggest a need to modify the rule. Start with all relative ADs, collect all service bulletins and service letters offered by the particular engine manufacturer, and sit with the insurance adjuster. These cases should be handled as sudden stoppages because of potentially severe side loading on the crankshaft flange, front bearing, and seal.". In fact it is a very insidious situation since there is often no obvious damage-no harm, no foul so to speak. It has been determined further that this action involves an emergency regulation under DOT Regulatory Policies and Procedures (44 FR 11034, February 26, 1979). McCauley hubs must be retired if any of the blades within the assembly are bent beyond repair limits inboard of the 85 percent blade radius. TCM mandatory service bulletin (MSB) 005B, dated May 25, 2000, and MSB 005C, dated October 10, 2000, were issued to include the SN's of those additional suspect crankshafts. Anderson, owner of Corona Cylinder and Engine Overhaul, said the cost of a teardown and inspection, for a small four-cylinder engine like the O-360 or -320, is about $4,000. The AD specifies the inspection at each engine overhaul, after a propeller strike, sudden stoppage, or whenever gear train repair is required. That engine may be a time bomb, and an illegal one if the data plate is still on the engine, as after some mods it no longer qualifies as a certified engine, and may not be economically able to be recertified, depending on what was done to it. Disregard the letter R.. CONTINENTAL TSIO-520-J $18,995 FOR SALE Engine with Accessories TSMO=488.2 No Prop Strike Photos, logs, details per request. Following any propeller strike, complete disassembly and inspection of all rotating engine components is mandatory and must be accomplished prior to Although many in the industry still like to interpret rules to their advantage, the mechanic is being faced with fewer and fewer "outs" To be undiplomatic, dialing in a crank after a prop strike or sudden stoppage as has been defined by both the manufacturers and the FAA is essentially a fools errand-at least as possible decision making criteria on the serviceability of the crank. This table of contents is a navigational tool, processed from the 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. 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