documents in the last year, by the Federal Communications Commission The deffination of a prop strike is different on Lycomings than Continentals, Lycoming says any time a prop strikes any thing that will cause a loss of RPM it is a prop strike. Plus, unless you were watching the tach, how would you know? But it's getting harder 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. One, "A sudden rpm drop while impacting water, tall grass, or similar yielding medium, where propeller damage is not normally incurred." PROPELLER STRIKE INSPECTIONS. If you've attended AirVenture or any of the other major airshows, you've heard it. The flange will break before it bends. Another thing to look for in the logs is a prolonged period of inactivity, such as years between annual inspections and oil changes. Its not a smoking gun, but perusing the accident reports makes one wonder about such coincidences. A report that summarizes each FAA-public contact concerned with the substance of this AD will be filed in the Rules Docket. The actions are required to be accomplished in accordance with the service bulletin described previously. For example, how much propeller filing constitutes "minor dressing?" At what point after a prop strike do you need an engine teardown and inspection? This amendment is prompted by reports of crankshaft failures, and by the addition of additional crankshaft serial numbers (SN) that have been added to the suspect population. In light of the preceding information, would you be comfortable doing that? They were legitimate, having been initiated after an inspection, but that doesn't help when selling the airplane. Unfortunately, disassembly and nondestructive testing procedures are the only way to provide a reasonable level of assurance that the engine is truly fit for continued service. This can cause major internal engine damage without visible prop damage. Another problem area is in engines with crank counterweights, a very common design. Their decision would involve the specific engine involved, the severity of the prop damage, the cost, the time on the engine, whether the prop was stopped or appreciably slowed, who was flying at the time, what else is going on in the shop, and maybe the time of year and their mother's maiden name. This is not restricted to propeller strikes againstthe ground. Type of operator/engine makes a difference We see flyweights and connecting hardware, in some designs, brutalized quite frequently by sudden stoppage. 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. AD/PROP/1 Amdt 2 (continued) Page 6 of 9 HOFFMAN (continued) Continental IO-346 engines 1000 All other Fixed Pitch Types 2000 Flottorp storage, overspeed, ground strike or aerobatic requirements refer mt-propeller Service Bulletin 1 Revision X. Prop strike. These two words are guaranteed to make any pilot wince. Comments for inclusion in the Rules Docket must be received on or before January 26, 2001. 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. Docket 2000-NE-16-AD. 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. certain lots, of steel production or forming operations. documents in the last year, by the Veterans Affairs Department headings within the legal text of Federal Register documents. 01/17/2023, 284 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 bulletin reads as follows: 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. But what is a prop strike and what exactly are the ramifications? Service Bulletin 533A has the pertinent Lycoming prop-strike definitions for all Lycoming direct drive engines. The alternator is turning 3000 rpm because of gearing. Following any propeller strike, complete disassembly and inspection of all rotating engine components is mandatory and must be accomplished prior to So carefully consider all factors related to propeller strikes. I watched the video and figured the pilot had reduced power before hitting the ditch. This article originally appeared in the December 2012 issue of Light Plane Maintenance. 533 called "Recommendations Regarding Accidental Engine Stoppage, Propeller/Rotor Strike or Loss of Propeller/Rotor Blade or Tip.". This site displays a prototype of a Web 2.0 version of the daily Lycoming has reports of ground strikes, which have resulted in overstressed connecting rod bolts, that failed later. What you see in the pictures is what you are getting. My investigation started with my need for another engine for my Cessna 210. A prop that hits so hard as to bend the crank flange is only one of several considerations. In this Issue, Documents documents in the last year, 12 These cases should be handled as sudden stoppages because of potentially severe side loading on the crankshaft flange, front bearing, and seal. All communications received on or before the closing date for comments will be considered, and this rule may be amended in light of the comments received. Communications should identify the Rules Docket number and be submitted Start Printed Page 70655in triplicate to the address specified under the caption ADDRESSES. for the aircraft owner. 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. At Unlimited Aero Engines we know that things happen, and happen fast. 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. The argument goes would you rather be paying for an in flight engine failure 100 hours from now. The FAA definition of a sudden stoppage, is the engine stopping suddenly in under one rpm. 2023 Endeavor Business Media, LLC. All comments submitted will be available, both before and after the closing date for comments, in the Rules Docket for examination by interested persons. Nitride hardened cranks have a greater tendency to crack, since the nitride hardened materials resist bending. They all agreed that if it were their aircraft, they would think long and hard about doing a teardown and inspection. Now I had to determine the consequences. 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 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. Now that I had a definition, what would I have to do about such an event? Airmark Overhaul, Inc. 6001 NW 29th Avenue Fort Lauderdale, FL 33309. 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. That action was prompted by reports of crankshafts on which the connecting rod journals had fractured. 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." document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); WORLD'S PREMIER INDEPENDENT AVIATION NEWS RESOURCE. 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. Both Lycoming and Continental express concerns about prop-strikes causing damage to the rear of the crank in the vicinity of the rear radius of the oil slinger, which can be shoved back into the case rear. 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). ", 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. (2) After obtaining the results of the core sample evaluation, disposition the crankshaft as follows: (i) If TCM notifies you that the crankshaft is not serviceable, replace the crankshaft with a serviceable crankshaft of the same part number before further flight. This could indicate a gear-up landing, or other source of damage that took time to fix. 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. TCM is less equivocal. 2 Blade Continental O-200/Lycoming O-235 Ground Adjustable STOL Propeller $ 74CK $ 76AK-2 $ FIND A DEALER NEAR YOU. He also said prospective owners should review the logs to see if the propeller has been changed. Section 39.13 is amended by adding the following new airworthiness directive: 2000-23-21 Teledyne Continental Motors: Amendment 39-11994. 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 Dealing with them on this issue is fodder for another article, however. 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. developer tools pages. Service Bulletin 533A has the pertinent Lycoming prop-strike definitions for all Lycoming direct drive engines. 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. The FAA has reviewed and approved the technical contents of TCM Mandatory Service Bulletin (MSB) 005C, dated October 10, 2000. New posts Search forums. Should he also have performed the obligatory engine inspections? Forums. This feature is not available for this document. There used to be, but it was kind of informal and there was a lot open to interpretation. On Lycoming engines, which are not nitrided, the flange can be bent. 49 U.S.C. The thought of the damage and cost involved makes all of us shudder. Never allow an insurance adjuster to dictate the inspection requirements after an incident. This proposed rule does not have federalism implications, as defined in Executive Order No. There's a tremendous amount of energy stored in the rotating flyweight, and when all of a sudden you stop the prop and engine, that energy has to be dissipated somewhere.". In fact it is a very insidious situation since there is often no obvious damage-no harm, no foul so to speak. The OFR/GPO partnership is committed to presenting accurate and reliable Its also important to point out that this is not the only Lycoming bulletinthat discusses prop strikes. We like to think that those we deal with are honest, however, there's a chance of impropiety by a seller, so when buying an airplane, be careful. You could identify its sound with your eyes closed. Aircraft Owners & Pilots Association Find it free on the store. 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. K. kevmor99. has no substantive legal effect. You can find the Service Bulletins for Continental Aerospace Technologies Type Certificated Gasoline Engines below. 01/17/2023, 159 The degree of difficulty of this action will bevaried, depending on the installation and location of accessories, turbos, intercoolers, etc. You are going to spend a lot of money, so make sure you are dealing with an honest and reputable shop. 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. documents in the last year, 37 There can be some major damage to mag drives, alternator drives, superchargers, gear boxes, pump drives, governor drives, etc. Continental Properties has earned a spot on the National Multifamily Housing Council's (NMHC) list of the Top 10 developers in the country. For those engines that were overhauled in the field with factory new crankshafts, the crankshaft SN should be shown in work orders, log books or other maintenance records. Counts are subject to sampling, reprocessing and revision (up or down) throughout the day. They are often ignored in the prop-strike evaluation, yet they have prescribed inspection criteria even if involved in only a sudden stoppage. 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. About the Federal Register That AD requires removing a core sample of material from the propeller mounting flange and sending the core sample to TCM for evaluation. In another incident a prop hit a small rock, which had been dislodged and thrown back by a larger aircraft. 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. (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). (2) Any incident during engine operation in which the propeller impacts a solid object that causes a 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. 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." 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. Maybe it is and maybe it isn't." 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. This is a minor or major prop repair issue, but not a potential engine tear down issue. 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. AC 43.13-1B has lots of general information in Chapter 8 on prop strikes. What looks like light damage may sometimes result in something broken or highly stressed inside, while a major collision shows nothing wrong after it's been torn down." (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. legal research should verify their results against an official edition of This table of contents is a navigational tool, processed from the According to DeJoris, "Hartzell requires hub replacement if any blade in the assembly is bent beyond repair limits due to impact damage. He adds, "This limits their liability exposure. This dream price just may be the cast off of a prop-strike incident that has been covered up or minimized in some way-or a prop with blades that are out of spec from metal removed from previous overhauls. Jerry Robinette, Senior Engineer, Propulsion, Atlanta Aircraft Certification Office, FAA, Small Airplane Directorate, One Crown Center, 1895 Phoenix Blvd., Suite 450, Atlanta, GA 30349; telephone: (770) 703-6096, fax: (770) 703-6097. '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." And what's a "solid object?" You can bet the fellow who hit the traffic cone never made a logbook entry unless the engine had to be repaired. 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. In fact, the customers were sold their own crank. Crankshafts with this type of subsurface defect will fail.
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