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Explains failure modes and why pivot-shaft cracks can lead to costly, intensive repairs affecting wing, fuselage, and major systems. Provides component background, historical part-number changes, light vs. heavy shaft types, and practical inspection requirements including removal, crack detection, dimensional checks, and recommended replacement or magnaflux inspection based on governing technical guidance.",{"@graph":69,"@context":122},[70,84,105],{"@type":71,"itemListElement":72},"BreadcrumbList",[73,77,79,82],{"item":74,"name":75,"@type":76,"position":8},"https://docshare.wps.com","Home","ListItem",{"item":78,"name":9,"@type":76,"position":14},"https://docshare.wps.com/document/",{"item":80,"name":40,"@type":76,"position":81},"https://docshare.wps.com/document/research-report/",3,{"item":83,"name":65,"@type":76,"position":19},"https://docshare.wps.com/document/p-51-landing-gear-pivot-shafts-overview-and-inspection-guide/664607/",{"url":83,"name":65,"@type":85,"image":86,"author":91,"headline":65,"publisher":94,"fileFormat":97,"inLanguage":63,"description":67,"dateModified":98,"datePublished":99,"encodingFormat":97,"isAccessibleForFree":100,"interactionStatistic":101},"DigitalDocument",{"url":87,"@type":88,"width":89,"height":90},"https://docshare.wps.com/thumbnails/p-51-landing-gear-pivot-shafts-overview-and-inspection-guide/664607.png","ImageObject",300,407,{"name":92,"@type":93},"Stanley","Person",{"url":74,"name":95,"@type":96},"DocShare","Organization","application/pdf","2026-10-30","2026-10-29",true,{"@type":102,"interactionType":103,"userInteractionCount":81},"InteractionCounter",{"@type":104},"ViewAction",{"@type":106,"mainEntity":107},"FAQPage",[108,114,118],{"name":109,"@type":110,"acceptedAnswer":111},"Why is the P-51 landing gear pivot shaft considered critical?","Question",{"text":112,"@type":113},"It is the attachment and rotation point for landing gear retraction into the wing, carrying stresses from gear attachment and impact from wheel contact during landing.","Answer",{"name":115,"@type":110,"acceptedAnswer":116},"What are the main differences between light and heavy pivot shafts?",{"text":117,"@type":113},"Light shafts have specific interior wall and thrust-face geometry with a smaller stress-reduction design, while heavy shafts have increased wall thickness and strengthened areas, reducing cracking propensity.",{"name":119,"@type":110,"acceptedAnswer":120},"How should pivot shafts be inspected to detect cracks effectively?",{"text":121,"@type":113},"Remove the shaft to inspect crack locations around radii. Dye penetrant is not sufficient; magnetic particle (magnaflux) inspection is recommended, alongside dimensional analysis for straightness, spline location, hole elongation, chromed surface dimensions, and chrome flaking checks.","https://schema.org",{"og:url":83,"og:type":124,"og:title":65,"og:site_name":95,"og:description":67},"article",{"robots":126,"canonical":83},"index,follow",{"doc_id":128,"site_id":62},664607,1793262399,{"code":4,"msg":5,"data":131},{"doc_id":128,"user_id":132,"nickname":92,"user_avatar":133,"doc_module":4,"category_id":39,"category_name":40,"doc_title":65,"doc_description":67,"doc_content":134,"file_id":135,"file_url":136,"file_type":137,"file_size":138,"view_count":81,"is_deleted":4,"is_public":8,"is_downloadable":8,"audit_status":8,"page_count":24,"language":139,"language_code":63,"site_id":62,"html_lang":63,"table_of_contents":140,"faqs":141,"seo_title":142,"seo_description":67,"update_tm":129,"read_time":143},2336477405376,"https://ap-avatar.wpscdn.com/davatar_29158cc5080c5b710cf443261637dec0","DOCUMENT AC.A. 01-151-L2 26 APRIL 2017  \nP-51 Landing Gear Pivot Shafts  \nAll P-51 Mustang Variants  \nManufacturer Aircraft  \nNAA Part Number Bendix Part Numbers Proper Description Location  \nNickname  \nManufacturer-North American Aviation P-51 Mustang  \n73-33112  \n66584 & 161271  \nLanding Gear Pivot Shaft and Ring Assembly  \nOne assembly is located at the top of each P-51 Landing Gear Assembly (P/N 73-33102)  \nPivot Shaft  \nDigital drawing of NAA pivot shaft on AirCorps Library  \nOVERVIEW / EXECUTIVE SUMMARY  \nNobody wants to witness, participate in, or collapse a landing gear on a Mustang. It is a costly and intensive repair resulting in damage to wing, fuselage, and major components. While the most common reason a Mustang ends up on its belly is pilot error, another factor can be the failure of a landing gear pivot shaft. Fortunately, there are inspections, preventative measures and solutions that almost eliminate the likelihood of this failure mode. AirCorps Aviation in Bemidji MN has compiled a comprehensive explanation of the failure modes of this critical component, with the belief that it is something every pilot and mechanic involved with a Mustang should thoroughly understand.  \nRead on to learn why...  \nLOCATION/FUNCTION  \nPivot shaft is an abbreviated description from the actual component properly named Landing Gear Pivot Shaft and Ring Assembly. This critical component can be described as the point at which the gear leg attaches and rotates for retraction of landing gear into the wing. It also bears the stress of attachment of a landing gear to wing and absorbs the impact of the main wheel tires making contact with the ground upon landing.  \nCOMPONENT BACKGROUND  \nThe pivot shaft was designed and engineered by North American as P/N 73-33112 on July 5, 1940 and checked / approved about a month later. The NAA drawing identifies two were used per ship on on all P-51 variants, F-51 & A-36 Series aircraft A thru K. On June 6, 1943 the drawing was made inactive and production was handed over to Bendix who produced the part as part number 66584 – a “light shaft” and as 161271 – a “heavy shaft” subsequently discussed.  \nTYPES OF PIVOT SHAFTS  \nMustang expert Mark Tisler explains the three generations of pivot shafts commonly referred to as light, light cut, and heavy.  \nA light landing gear pivot shaft (P/N – 73-33112 & 66584) has two different generations of production, both of which share a light wall on the interior of the shaft. The first generation “light” pivot shaft has a sharp radius on the thrust face anda 90 degree corner around the radius of the chrome bearing. The second generation “light cut” pivot shaft has had the 90 angle undercut to give it a radius and reduce stress concentration. Tech Order 01-60JE-47 outlines replacement of light shafts with heavy shafts.  \nA heavy landing gear pivot shaft (P/N 161271) is machined differently on the inside bore of the pivot tube and has increased wall thickness. The pivot shaft thrust face has a large radius cut away to make a symmetrical sloping edge. There are also diagonal bands called “cheeks” on each side of the pivot shaft and an additional bead around the base to reduce the propensity to crack.  \nLight pivot shaft drawing 73-33112-Notice the common cracking point on the left and how inner diameter 3. 359” leaves a wall thickness of only 9/32”.  \nLight pivot shaft -Notice lack of additional material in the cheeks area of the shaft. Only 3 of the 16 light pivot shafts inspected and tested by AirCorps have passed.  \nHeavy pivot shaft -Notice additional material through cheeks of shaft to strengthen area prone to cracking. Also the chamfered / symmetrical sloping edge is visible within the highlighted area where the upright portion makes the transition to the shaft.  \nINSPECTION  \nIn overhauling 10 sets of landing gear over the past two years, AirCorps has established a standard process of handling these increasingly rare, high-value components. The importance of re","cbCaihn5U5ZYiy3m","https://ap.wps.com/l/cbCaihn5U5ZYiy3m","pdf",1610183,"English","# Overview / Executive Summary\n## Location / Function\n## Component Background\n## Types of Pivot Shafts\n## Inspection\n## Pivot Shaft Failures","[{\"question\":\"Why is the P-51 landing gear pivot shaft considered critical?\",\"answer\":\"It is the attachment and rotation point for landing gear retraction into the wing, carrying stresses from gear attachment and impact from wheel contact during landing.\"},{\"question\":\"What are the main differences between light and heavy pivot shafts?\",\"answer\":\"Light shafts have specific interior wall and thrust-face geometry with a smaller stress-reduction design, while heavy shafts have increased wall thickness and strengthened areas, reducing cracking propensity.\"},{\"question\":\"How should pivot shafts be inspected to detect cracks effectively?\",\"answer\":\"Remove the shaft to inspect crack locations around radii. Dye penetrant is not sufficient; magnetic particle (magnaflux) inspection is recommended, alongside dimensional analysis for straightness, spline location, hole elongation, chromed surface dimensions, and chrome flaking checks.\"}]","P-51 Landing Gear Pivot Shafts - Overview and Inspection Guide | PDF",13]