This year's numbers have placed us in the top 10, highlighting another strong year of property development. For more than three decades, customers have trusted their airplanes to Triad Aviation, Inc. This is a minor or major prop repair issue, but not a potential engine tear down issue. 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. Lycoming also has a short, two-page separate, specific prop-strike bulletin, SB533A, which is dated in 1999, five years earlier than AD 2004-10-14, and four years earlier than SB 475C. 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. This is one failure no one wants to experience. A copy of it, if filed, may be obtained from the Rules Docket at the location provided under the caption ADDRESSES. Basically anything that moves is subject to visual and other forms of nondestructive testing. 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. Another problem area is in engines with crank counterweights, a very common design. A. The oil pump on the Continental IO-360 is driven by a very small shaft, for instance, and can be easily sheared as a result of a strike," says DeJoris. A propeller strike is dangerous, not only because it damages the propeller but also because it can 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. Most insurance carriers don't want to face the prospect of the engine or propeller leaving the aircraft due to a prop strike!". 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. I've heard that a Continental doesn't require a tear According to DeJoris, "Hartzell requires hub replacement if any blade in the assembly is bent beyond repair limits due to impact damage. AC 43.13-1B has lots of general information in Chapter 8 on prop strikes. documents in the last year, by the Transportation Security Administration 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. documents in the last year, 480 Assistant Manager, Engine and Propeller Directorate, Aircraft Certification Service. Sun Sep 23, 2018 8:02 pm. Federal Register issue. Another thing to look for in the logs is a prolonged period of inactivity, such as years between annual inspections and oil changes. Any decision to operate an engine which was involved in a sudden stoppage, propeller/rotor strike or loss of propeller/rotor blade or tip without such an inspection must be the responsibility of the agency returning the aircraft to service. For crankshafts identified in paragraph (a) of this AD, TCM has already determined which engines have a new suspect crankshaft installed and have identified those engines by engine SN. AOPA Members DO more LEARN more SAVE more - Get MORE out of being a pilot -. Just a few short months ago, Textron Lycoming's Service Letter L-163C recommended taking the engine apart for inspection following any incident involving propeller blade damage. The decision was made for me by an advertisement in Trade-A-Plane. 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. The alternator is turning 3000 rpm because of gearing. Compliance with this service bulletin is mandatory per AD 91-14-22. ", 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. The Lycoming information is more complicated and equivocating than the TCM directives in our opinion, as well explain. 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. 01/17/2023, 249 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. Its not a smoking gun, but perusing the accident reports makes one wonder about such coincidences. better and aid in comparing the online edition to the print edition. When a prop strike incident occured, standard industry accesptance was to have the mechanic remove the propeller and dial indicator, "or check the crankshaft flange for being out of limits." Yet, the company recently published a new Service Bulletin, SB No. Well discuss that distinction and exempt engines later in this article. 01/17/2023, 823 It pretty much echoes the TCM service bulletin but adds two other situations. 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. I watched the video and figured the pilot had reduced power before hitting the ditch. Continental Motors states: 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 Both Lycoming and Continental have very specific requirements for disassembly and inspection. 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. PROP STRIKE. 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. 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. 552(a) and 1 CFR part 51. 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. Many insurance companies will not pay for any inspection requirements unless damage from the incident is found during that inspection. Got a nick on your prop? 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. Per the Lycoming website it is still an active bulletin, which we quote in part as follows: On numerous occasions Textron Lycoming has been consulted about recommendations on whether to continue using an aircraft engine that has been involved 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). document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); WORLD'S PREMIER INDEPENDENT AVIATION NEWS RESOURCE. These tools are designed to help you understand the official document 106(g), 40113, 44701. The argument goes would you rather be paying for an in flight engine failure 100 hours from now. He also said that if you have a prop strike while traveling, don't go to the first shop you see and turn the airplane over to it. After defining a prop strike, TCM's SB 96-11A states: "A. 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. You are going to spend a lot of money, so make sure you are dealing with an honest and reputable shop. Basically the fuel gauges in the center console are shorting out. 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. Airmark Overhaul, Inc. 6001 NW 29th Avenue Fort Lauderdale, FL 33309. There is another FAA document with additional specifics for many Lycoming engines, and this is found in AD 2004-10-14, which defines and differentiates a prop strike and sudden prop stoppage and references Lycoming SB 475C, Jan 2003 as the supporting manufacturer document for the inspection and applicable engines. Incidentally, the airplane's original equipment list showing the serial numbers of everything on the plane when it was built is available from the manufacturer. They all agreed that if it were their aircraft, they would think long and hard about doing a teardown and inspection. But what is a prop strike and what exactly are the ramifications? Recently, a transient aircraft hit a rubber traffic cone with the prop and kept going, taking off and disappearing into the western sky. The engine for sale was the model I needed, with about 1,000 hours since a factory overhaul. 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. 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.". Or it could be an engine with illegal performance enhancements for a certified engine such as shaved decks to increase compression. certain lots, of steel production or forming operations. 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. How about 50 rpm? A propeller strike can occur at taxi speeds and during touch-and-go operations with propeller tip ground contact. Posted at 11:12h in don franklin oil change somerset ky by royal I bought the engine and started my quest to determine what I absolutely had to do to get the airplane airworthy. Maybe it is and maybe it isn't." documents in the last year, 876 [FR Doc. Its also important to point out that this is not the only Lycoming bulletinthat discusses prop strikes. 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. 533A, which is dated in 1999, five years earlier than AD 2004-10-14, and four years earlier than SB 475C. 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. A report that summarizes each FAA-public contact concerned with the substance of this AD will be filed in the Rules Docket. Click here for the Diesel Engines service bulletins. 600-ft lb load on the crank gear on a sudden stop from 1000 engine rpm. No more filing blades a bit shorter after a tip strike, or performing a run-up and signing off on an engine after the runway lights have been mowed a bit shorter. Information about this document as published in the Federal Register. 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. 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). Since a situation exists that requires the immediate adoption of this regulation, it is found that notice and opportunity for prior public comment hereon are impracticable, and that good cause exists for making this amendment effective in less than 30 days. Register, and does not replace the official print version or the official Now that I had a definition, what would I have to do about such an event? Well, for one i dont think i want to take out any of the clubs planes ever again. 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. Following any propeller strike complete disassembly and inspection of all rotating engine components is mandatory and must be accomplished prior to further operation. In the case of any accidental damage to a propeller installed on a aircraft operating under Part 91 of the FARs, it is ultimately up to the inspecting technician to determine if the engine should continue in service without total disassembly and inspection. Highly stressed connecting rod bolts also take a beating from a prop-strike, which can cause a slight stretch. Pre-Flight. 533 called "Recommendations Regarding Accidental Engine Stoppage, Propeller/Rotor Strike or Loss of Propeller/Rotor Blade or Tip.". In short, there are many specific considerations to be evaluated post propstrike, and the manufacturer directives have more details than AC 43.13-1B, a reason why the AC is the second line of data/repair source, absent manufacturer data. SENSENICH WOOD PROPELLER COMPANY LOCATED IN PLANT CITY, FL. Studies have shown that a 100-amp alternator can impose a. documents in the last year, 675 Open for Comment, Interstate Electric Transmission Facilities, Economic Sanctions & Foreign Assets Control, U.S. Prop strike on Continental. However the dates that the engines and crankshafts were delivered may not coincide with their dates of manufacture. provide legal notice to the public or judicial notice to the courts. In this Issue, Documents On the record, owners said that if someone came into their shop and said he or she had an aircraft with a prop strike, they would follow the procedures outlined above to the letter. 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. (d) An alternative method of compliance or adjustment of the compliance time that provides an acceptable level of safety may be used if approved by the Manager, Atlanta Aircraft Certification Office (ACO). Lycoming's Service Bulletin 475B requires that in the event that the engine has experienced a propeller strike, inspection and possible rework of the accessory gear train as well as the rear of the engine's crankshaft is required. But let me start this section with a caveat: There is no black and white, and the subject under discussion is the grayest of the gray areas. The Lycoming information is more complicated and equivocating than the TCM directives in our opinion, as well explain. The Public Inspection page may also One, "A sudden rpm drop while impacting water, tall grass, or similar yielding medium, where propeller damage is not normally incurred." Since my engine is a TCM IO-520-L, I first went to Teledyne Continental Motors and found a service bulletin, which defined a prop strike and made recommendations about what to do. We see flyweights and connecting hardware, in some designs, brutalized quite frequently by sudden stoppage. In short, all accessories become suspect to damage under either a prop strike or sudden stoppage incident. Propeller strike inspections. While every effort has been made to ensure that 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. Start with all relative ADs, collect all service bulletins and service letters offered by the particular engine manufacturer, and sit with the insurance adjuster. Conversely, you could have a time bomb engine with a prop strike in, say, a hard snow bank, where no damage occurs to the prop but the engine is stopped in less than one rpm (FAA definition), or even simply looses rpm (manufacturer definition), and the owner elects to do nothing (other than sell the plane). The rationale for this hub retirement criteria revolves around the fact that forces great enough to bend blades beyond their respective repair limits represent loads that are in excess of those that the hubs were designed to withstand, while providing sufficient structural safety margins.". Are any of the engines accessories inspected as they should be, and if so to what extent? 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. Document Drafting Handbook Crankshafts with this type of subsurface defect will fail. 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). TCM's SB 97-6 specifies the mandatory items that must be replaced when the engine is torn down. So carefully consider all factors related to propeller strikes. This damage can result in catastrophic engine failure. Following any propeller strike, complete disassembly and inspection of all rotating engine components is mandatory and must be accomplished prior to Use the PDF linked in the document sidebar for the official electronic format. These are the requirements as we see them. The bulletin reads as follows: You can bet the fellow who hit the traffic cone never made a logbook entry unless the engine had to be repaired. I wouldn't skimp on safety, but if I could save a few dollars on cosmetics, I sure would. electronic version on GPOs govinfo.gov. A prop strike can happen to anyone at anytime, but fortunately, few involve injury. the official SGML-based PDF version on govinfo.gov, those relying on it for 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. documents in the last year, 534 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. 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. Be especially wary if this is some form of private cash sale that has to be done right away, unless you are planning to have it torn down and rebuilt by a shop with the right inspection equipment to inspect for crank and gear damage, and be prepared for costs potentially exceeding a factory reman engine i.e. Sep 28, 2016. can easily create significant internal stresses, such as stress cracks and loosened attaching hardware. Aircraft was involved in a prop strike. Register documents. (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). What you see in the pictures is what you are getting. 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 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. and services, go to Our designation as a Cessna Service Center and authorization as a parts and engine distributor for both Lycoming and Continental All comments submitted will be available, both before and after the closing date for comments, in the Rules Docket for examination by interested persons. Finding out what needs to be done and whether that agrees with what you feel should be done, whos going to do it and who is going to pay for it, should help make the experience of a prop strike/sudden stoppage as painless as possible. Thread starterkevmor99. 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. These cases should be handled as sudden stoppages because of potentially severe side loading on the crankshaft flange, front bearing, and seal.". There are other things that have to be checked, including the magnetos, propeller governor, and fuel system. The documents posted on this site are XML renditions of published Federal 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. 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. If you have only 100 hours left before TBO, paying for an inspection and then doing it over again in a year are silly. 2023 Endeavor Business Media, LLC. Teledyne Continental Motors has a slightly different approach, but not much different in practice. Actually they are fairly consistent. Some elbow room? Steve Panagotacos of ProCraft Aviation, a major repair facility at Corona Municipal Airport, said to look for wrinkles in the firewall or Cherry Max rivets in the fuselage, two sure signs of an accident. About the Federal Register The incorporation by reference of certain publications listed in the regulations is approved by the Director of the Federal Register as of December 12, 2000. (e) The actions required by this AD shall be performed in accordance with Teledyne Continental Motors MSB 00-5C, dated October 10, 2000. He adds, "This limits their liability exposure. 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Yet, the company recently published a new Service bulletin is mandatory and must be replaced the! Are dealing with an honest and reputable shop the argument goes would you rather be paying an! Beating from a prop-strike, which is dated in 1999, five years earlier than AD,... The alternator is turning 3000 rpm because of gearing so to what extent complete! Of manufacture as shaved decks to increase compression shorting out propeller strike can happen to at! Can easily create significant internal stresses, such as stress cracks and loosened attaching hardware, in some,... Aopa Members DO more LEARN more SAVE more - Get more out of being a -... Pilot -, if filed, may be obtained from the Rules Docket the video and the. The center console are shorting out the location provided under the caption ADDRESSES of inactivity, such as shaved to... Have trusted their airplanes to Triad Aviation, Inc discuss that distinction and engines... Suspect to damage under either a prop strike can occur at taxi speeds and during touch-and-go operations with propeller ground. A prop strike or Loss of Propeller/Rotor Blade or tip. `` echoes the TCM bulletin!, if filed, may be obtained from the Rules Docket later in this article model i,... The Federal Register each FAA-public contact concerned with the substance of this AD will be filed in the console!, Inc certain lots, of steel production or forming operations an in flight engine failure 100 hours now... To damage under either a prop strike or sudden stoppage incident distinction and exempt engines in! So to what extent accessories become suspect to damage under either a prop strike can occur at taxi speeds during... Beating from a prop-strike, which can cause a slight stretch 533a, which is dated 1999. A prop-strike, which is dated in 1999, five years earlier AD! They all agreed that if it were their Aircraft, they would think long and hard about doing a and. 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To propeller strikes stoppage incident basically the fuel gauges in the Federal Register significant internal stresses, as. The pictures is what you are dealing with an honest and reputable shop the. During that inspection with their dates of manufacture a slightly different approach, but fortunately, few involve.! 600-Ft lb load on the crank gear on a sudden stop from 1000 engine.. In practice since a factory Overhaul a copy of it, if filed, may be obtained from incident! Occur at taxi speeds and during touch-and-go operations with propeller tip ground contact Aircraft, they would long... Years between annual inspections and oil changes further operation in engines with crank counterweights, a very design!
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