The thought of the damage and cost involved makes all of us shudder. 49 U.S.C. Lycoming also has a short, two-page separate, specific prop-strike bulletin, SB. They all agreed that if it were their aircraft, they would think long and hard about doing a teardown and inspection. 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. At what point after a prop strike do you need an engine teardown and inspection? 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. Its also important to point out that this is not the only Lycoming bulletinthat discusses prop strikes. (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. 552(a) and 1 CFR part 51. Although many in the industry still like to interpret rules to their advantage, the mechanic is being faced with fewer and fewer "outs" TCM has informed the FAA that it intends to maintain a 24 to 48 hour turn-around time for notification of the crankshaft airworthiness. CONTINENTAL TSIO-520-J $18,995 FOR SALE Engine with Accessories TSMO=488.2 No Prop Strike Photos, logs, details per request. And what's a "solid object?" Some reports are quite specific about a recent prop strike in the engines history. The President of the United States communicates information on holidays, commemorations, special observances, trade, and policy through Proclamations. 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. on continental prop strike ad. Is the engine being completely disassembled and inspected? 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.". A copy of it, if filed, may be obtained from the Rules Docket at the location provided under the caption ADDRESSES. documents in the last year, 1487 I alluded to the potential of buying an airplane that suffered a prop strike without the required inspections being completed. the official SGML-based PDF version on govinfo.gov, those relying on it for 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. Following any propeller strike, complete disassembly and inspection of all rotating engine components is mandatory and must be accomplished prior to This is a minor or major prop repair issue, but not a potential engine tear down issue. How much more time before overhaul is remaining on the engine? #1. According to DeJoris, "Hartzell requires hub replacement if any blade in the assembly is bent beyond repair limits due to impact damage. You will also find additional info detailing prop damage repair, minor to major, irrespective of any of the prop strike consideration. 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 I spoke with several shop owners and asked their opinion. documents in the last year, by the Transportation Security Administration The opinions differ with each individual, and what maintenance technicians would do personally is quite often at odds with their professional opinions. He also said prospective owners should review the logs to see if the propeller has been changed. Everyone was happy and the prices were right. Below are three important links from the FAA, Lycoming, and Teledyne Continental regarding the definition of a Prop Strike and sudden stoppage. Propeller strikes against the ground or any object can cause engine and component damage even though the propeller may continue to rotate. 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. Unfortunately, it may be the next owner who discovers any hidden damage. Replace the rotobroach after the sixth core sample, or before if the rotobroach does not cut with the maximum torque applied. I wouldn't skimp on safety, but if I could save a few dollars on cosmetics, I sure would. It pretty much echoes the TCM service bulletin but adds two other situations. Note 10: 2400 hours TBO may apply. Incidentally, I opted to overhaul the engine instead of just doing an inspection. Refer McCauley Service Bulletin 137W. The AD specifies the inspection at each engine overhaul, after a propeller strike, sudden stoppage, or whenever gear train repair is required. This year's numbers have placed us in the top 10, highlighting another strong year of property development. Crankshafts with this type of subsurface defect will fail. Ken Tunnel of Lycon Aircraft Engines in Visalia, California, an engine facility used by a number of owners of show airplanes, said, "There's no way you can tell if there's any damage regardless of the circumstances. on NARA's archives.gov. The actions are required to be accomplished in accordance with the service bulletin described previously. The Lycoming information is more complicated and equivocating than the TCM directives in our opinion, as well explain. 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. How much grass and how deep should the water be, and how sudden is "sudden," and what constitutes an rpm drop? 01/17/2023, 284 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. It has been determined further that this action involves an emergency regulation under DOT Regulatory Policies and Procedures (44 FR 11034, February 26, 1979). documents in the last year, 946 Thread starterkevmor99. There used to be, but it was kind of informal and there was a lot open to interpretation. the Federal Register. better and aid in comparing the online edition to the print edition. Basically anything that moves is subject to visual and other forms of nondestructive testing. 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. 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. 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 addition, propeller strikes also include situations where an aircraft is K. kevmor99. 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. Well discuss that distinction and exempt engines later in this article. A report that summarizes each FAA-public contact concerned with the substance of this AD will be filed in the Rules Docket. Others are not necessarily so forthcoming, so reliable conclusions are difficult to draw. (ii) If TCM notifies you that the crankshaft is serviceable, the propeller assembly may be reinstalled. (ii) You may use each rotobroach bit to obtain up to six core samples. In many instances prop strikes will fall into the major repair category, which necessitates repair station or manufacturer repair of the prop (if needed). Lycoming makes the point that an overstressed crankshaft gear dowel pin can ultimately shear, causing all power to be lost. 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. So, when it comes time for that prop strike/sudden. Another problem area is in engines with crank counterweights, a very common design. rendition of the daily Federal Register on FederalRegister.gov does not This site displays a prototype of a Web 2.0 version of the daily Many insurance companies will not pay for any inspection requirements unless damage from the incident is found during that inspection. Textron Lycoming must take the position that in the case of a sudden stoppage, propeller/rotor strike or loss of propeller/ rotor blade or tip, the safest procedure is to remove and disassemble the engine and completely inspect the reciprocating and rotating parts including crankshaft gear and dowel parts. A prop strike-per the manufacturer and FAA definition is not often found to be minor other than the occasional small stone picked up causing minor blade damage but no rpm loss or prop removal is required for the repair, and those are key elements on the need for an engine tear-down-engine rpm loss or sudden stoppage from the strike. 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. If you can imagine a loose rod banging around inside your engine, you know it's bad. Prop strike. These two words are guaranteed to make any pilot wince. Communications should identify the Rules Docket number and be submitted Start Printed Page 70655in triplicate to the address specified under the caption ADDRESSES. Assistant Manager, Engine and Propeller Directorate, Aircraft Certification Service. 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. Federal Register issue. 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. Prior to any ground operation of the engine assure that the propeller flange and the crankshaft flange area are free of any crack indications in addition to the engine component inspection. 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. About the Federal Register Propeller inspections are fairly clear cut damage on the blades is typically quite apparent, and the existence of damage beyond field repair limits dictates that the unit is disassembled and given a searching internal inspection, and in some cases, complete overhaul. A. documents in the last year, 876 Document Drafting Handbook All of the fractures have been grouped around certain manufacturing dates between April 1, 1998, and March 31, 2000, inclusive. 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. 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. All rights reserved. This proposed rule does not have federalism implications, as defined in Executive Order No. 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. 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 Counts are subject to sampling, reprocessing and revision (up or down) throughout the day. (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. The OFR/GPO partnership is committed to presenting accurate and reliable Some elbow room? Copies may be obtained from Teledyne Continental Motors, PO Box 90, Mobile, AL 36601; telephone toll free 1-888-200-7565, or on the TCM internet site www.tcmlink.com. Disregard the letter R.. (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. TCM is less equivocal. 01/17/2023, 249 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." A bit of homework will go a long way towards helping you persuade your customer to do the right thing. All rights reserved. Our designation as a Cessna Service Center and authorization as a parts and engine distributor for both Lycoming and Continental 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. 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. (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. 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. For 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. Schwaner made the point that more than a few people have been told their engine's crank is bad, but it just so happens that the shop has the one you need in stock. 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). 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. 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