DeJoris says he is dealing with claims adjusters on a regular basis, and many adjusters today choose to have you go the extra mile and tear down the entire engine and propeller and do a thorough inspection." FAA# JL4R288M | EASA.145.4115 | Toll Free: 800-282-3202 | 954-970-3200 600-ft lb load on the crank gear on a sudden stop from 1000 engine rpm. 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. This article originally appeared in the December 2012 issue of Light Plane Maintenance. 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. 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). The other thing to consider is all of the accessories on the engine or parts of the engine that are spinning at high speeds that could come A full overhaul will cost about $12,500 plus accessories. If you have a favorite mechanic, he may know someone in the area who will pull the enginethis takes only a few hoursand ship it wherever you want. This later causes a total bolt failure and a dynamic disassembly in flight, which may or may not be correctly, attributed as to the real cause of the bolt failure. But what is a prop strike and what exactly are the ramifications? 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. documents in the last year, 37 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. In light of the preceding information, would you be comfortable doing that? The service information referenced in this AD may be obtained from Teledyne Continental Motors, PO Box 90, Mobile, AL 36601; telephone toll free 1-888-200-7565, or on Other Lycoming literature mentions the importance to check the accessories as does TCM. (iv) Do not exceed the torque limits specified in TCM MSB 00-5C, dated October 10, 2000, when obtaining the core sample. But what is a prop strike and what exactly are the ramifications? And as we previously mentioned, the Lycoming 475C bulletin is broader than a prop strike; it is oriented to general engine overhaul crank inspections or crankshaft gear removal for inspection as well as prop strikes. 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. Got a nick on your prop? This condition, if not corrected, could result in crankshaft connecting rod journal fracture, which could result in total engine power loss, in-flight engine failure and possible forced landing. If you can imagine a loose rod banging around inside your engine, you know it's bad. Any incident while the engine is operating in which the propeller makes contact with any object that results in a loss of engine RPM, such as propeller strikes against the ground or any object can cause engine and component damage even though the propeller may continue to rotate. In our response to readers we quote the latest manufacturer directives and FAA guidance, and add our perspectives and experience to hopefully help the owner feel his or her ultimate decision is the right and legal one. He's found that a major strike will probably stop an engine turning under 2,000 rpm, but over that speed the blades will usually bend. The bulletin reads as follows: of the issuing agency. 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 & In fact it is a very insidious situation since there is often no obvious damage-no harm, no foul so to speak. documents in the last year, 84 According to the salvage yard, the prop strike came about after an out-of-fuel landing on a road in Louisiana. 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. There can be some major damage to mag drives, alternator drives, superchargers, gear boxes, pump drives, governor drives, etc. My group also argued about the propeller hitting grass and water. How much more time before overhaul is remaining on the engine? Kennedy Airport Jetliner Aborts Takeoff To Avoid Another Jet Crossing Runway, FAA Says; Agency Investigating, FAA Releases Audio From Deadly Wings Over Dallas Air Show Crash Between Air Boss, Pilots, Year-End Surge Boosts Boeing, but Airbus Still No. All rights reserved. For example, how much propeller filing constitutes "minor dressing?" Pre-Flight. as a result of sudden stoppage. 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. The crankshaft SN is only used to determine the need for taking a core sample for those crankshafts identified in paragraph (a) and (b) of this AD. ", 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. Open for Comment, Interstate Electric Transmission Facilities, Economic Sanctions & Foreign Assets Control, U.S. developer tools pages. documents in the last year. Accordingly, the FAA has not consulted with state authorities prior to publication of this proposed rule. New Documents Thread starter kevmor99; Start date Sep 28, 2016; K. kevmor99 And anyway, who needs NOTAMs? He adds, "This limits their liability exposure. Highly stressed connecting rod bolts also take a beating from a prop-strike, which can cause a slight stretch. Definition of Propeller Strike (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 dressing of the blades. and services, go to that agencies use to create their documents. About the Federal Register In short, all accessories become suspect to damage under either a prop strike or sudden stoppage incident. 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. 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. on Comments may also be sent via the Internet using the following address: 9-ane-adcomment@faa.gov. Comments sent via the Internet must contain the docket number in the subject line. 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 or she feels that it is the prudent and responsible thing to do. This incorporation by reference was approved by the Director of the Federal Register in accordance with 5 U.S.C. There's also the cost of inspection of the accessories, which is extra. These are the requirements as we see them. Even tip damage is considered cause for teardown TCM is less equivocal. 1 in 2022, Southwest To Build Aircraft Hangar, Create 100 Jobs at Reid Airport, Boeing, United Airlines Finalize 737 MAX and 787 Order, Including Record Purchase for 100 Dreamliners. 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. 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. AC 43.13-1B has lots of general information in Chapter 8 on prop strikes. Engine inspection requirements after prop strikes can become complicated, however, and the regulations and recommendations seem to overlap and intertwine. Click here for the Diesel Engines service bulletins. Nitride hardened cranks have a greater tendency to crack, since the nitride hardened materials resist bending. On TCM engines with the geared alternators up front, he has seen the mounting flange and the gear drive bolts break during a prop strike. It pretty much echoes the TCM service bulletin but adds two other situations. (e) The actions required by this AD shall be performed in accordance with Teledyne Continental Motors MSB 00-5C, dated October 10, 2000. The OFR/GPO partnership is committed to presenting accurate and reliable Incidentally, I opted to overhaul the engine instead of just doing an inspection. The Lycoming information is more complicated and equivocating than the TCM directives in our opinion, as well explain. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); WORLD'S PREMIER INDEPENDENT AVIATION NEWS RESOURCE. rendition of the daily Federal Register on FederalRegister.gov does not in the separation of the propeller/rotor blade from the hub, the loss of a propeller/rotor blade tip or sudden stoppage following accidental propeller/rotor damage (such as propeller/rotor strike). On Lycoming engines, which are not nitrided, the flange can be bent. ", Director of Maintenance: "If you have to ask, it requires engine tear-down and inspection.". Comments for inclusion in the Rules Docket must be received on or before January 26, 2001. If the engine is being disassembled does the estimate include testing after reassembly? One, "A sudden rpm drop while impacting water, tall grass, or similar yielding medium, where propeller damage is not normally incurred." 2000-NE-16-AD, 12 New England Executive Park, Burlington, MA 01803-5299. The engines and crankshafts that are the subject of this AD were manufactured by TCM from April 1, 1998 through March 31, 2000. on FederalRegister.gov 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. On November 24, 1999, the FAA was notified of a crankshaft failure on a TCM engine. 01/17/2023, 249 01/17/2023, 202 PROP STRIKE. Sun Sep 23, 2018 8:02 pm. Factual information that supports the commenter's ideas and suggestions is extremely helpful in evaluating the effectiveness of the AD action and determining whether additional rulemaking action would be needed. Effective December 12, 2000. 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. As for dialing the flange, he said TCM nitrides the crank so checking the run-out of the flange is a waste of time. New posts Search forums. Following any propeller strike complete disassembly and inspection of all rotating engine components is mandatory and must be accomplished prior to further operation. Do we think the engine makers are overly eager to have you tear down or dig into your engine? better and aid in comparing the online edition to the print edition. After watching the video, with the airplane careening into a ditch amid a cloud of dirt and debris, I figured that the engine I just purchased fit these definitions. (ii) You may use each rotobroach bit to obtain up to six core samples. And two, "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 thought of the damage and cost involved makes all of us shudder. I wouldn't skimp on safety, but if I could save a few dollars on cosmetics, I sure would. S/N: 217920-73J Contact Sales Staff - TEXAS AIR SALVAGE, - located Bloomburg, TX 75556 United States Telephone: 9032557878 Posted January 9, 2023 Show all Ads posted by this Advertiser Recommend This Ad to a Friend "You naturally think of the crankshaft and things that are directly connected to the engine, but you don't think of other accessories. The $8,500 differential is not insignificant. 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. 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. 's Service Bulletin 96-11, in a nutshell, says that if a propeller must be removed from the aircraft to be repaired following a propeller blade impact of any sort or if the engine physically lost rpms from the incident, then the engine has experienced a propeller strike and it should be removed from service and completely disassembled and thoroughly inspected for damage from the incident." Lycoming has reports of ground strikes, which have resulted in overstressed connecting rod bolts, that failed later. documents in the last year, 830 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. A. To start my investigation, I wanted the official definition of a prop strike. (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. publication in the future. to a sudden stop. This can cause major internal engine damage without visible prop damage. documents in the last year, 675 Communications should identify the Rules Docket number and be submitted Start Printed Page 70655in triplicate to the address specified under the caption ADDRESSES. PROPELLER STRIKE INSPECTIONS. 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 1, 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. Prop strike. These two words are guaranteed to make any pilot wince. Basically the fuel gauges in the center console are shorting out. It turned out to be a salvage shop and the owner confirmed that the logs for the engine were available, and the crank had been dialed, and found to be OK. Dialing checks the run-out, which is the amount of movement at the flange when the crank is rotated. TCM is less equivocal. Its not a smoking gun, but perusing the accident reports makes one wonder about such coincidences. 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. Does 500 rpm fit that bill? There was no sudden stoppage involved, but because of the wording in a related Lycoming AD note, the crankshaft gear in the back had to be checked and this required substantial disassembly of the engine. Below are three important links from the FAA, Lycoming, and Teledyne Continental regarding the definition of a Prop Strike and sudden stoppage. Re: O-360 propeller indexing (noticeable slight vibration) Lycoming O-360 A-1As (and every other O-360 Ive met) propellers should be indexed such that the propeller stops at the 10 and 4 o'clock position (viewed from the front facing aft) when the engine shuts down. Dialing in the flange is worthless for this. If you have only 100 hours left before TBO, paying for an inspection and then doing it over again in a year are silly. This table of contents is a navigational tool, processed from the The actions specified by this AD are intended to prevent fracture of the crankshaft connecting rod journal, which could result in total engine power loss, in-flight engine failure and possible forced landing. Many insurance companies will not pay for any inspection requirements unless damage from the incident is found during that inspection. Posted at 11:12h in don franklin oil change somerset ky by royal Definition of Propeller Strike (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 dressing of the blades. Filing constitutes `` minor dressing? Lycoming has reports of ground strikes, which not. Not pay for any inspection requirements unless damage from the incident is found during that inspection..... 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