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inadequate maintenance and inspection

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Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c0091678
EISBN: 978-1-62708-217-4
... attack on the lug were evidence that the surface protection of the part had been inadequate as manufactured or had been damaged in service and not properly repaired in routine maintenance. Recommendations included anodizing the lug and barrel in sulfuric acid and giving them a dichromate sealing...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006821
EISBN: 978-1-62708-329-4
... affect the associated systems and the overall aircraft. The case studies in this article provide examples of aircraft component and system-level failures that resulted from various factors, including operational stresses, environmental effects, improper maintenance/inspection/repair, construction...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c9001748
EISBN: 978-1-62708-225-9
... gear spline. Wear on the spline teeth flanks of the coupling was attributed to severe wear on the mating gear (internal) spline teeth. The assigned cause was an inadequate maintenance procedure which resulted in a wear-damaged component being retained in the power train during engine overhaul...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c9001745
EISBN: 978-1-62708-217-4
.... Also, a 2000-T6 aluminum alloy swivel fitting experienced intergranular corrosion fracture as the result of stress-accelerated corrosion. Corrosion began because of a loose fit between the aluminum swivel fitting and steel tube assembly, which caused fretting. Inadequate maintenance and/or abnormal...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001754
EISBN: 978-1-62708-241-9
... subsequently led to the discovery of overlooked debris in an engine chip detector, and thus resulted in a review of several maintenance practices. aircraft bearings operating overload inadequate maintenance and inspection M50 alloy steel bulk deformation energy dispersive spectrometry chemical...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c9001903
EISBN: 978-1-62708-217-4
... Bolted joints Inspection Rotor blades Torque 4130 UNS G41300 Pitting corrosion Fretting wear Two examples illustrate the effects of fretting and/or fretting corrosion fatigue. One is attributed to insufficient design ( Figs. 1 , 2 , 3 ), and the other, to inadequate maintenance ( Figs. 4...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003500
EISBN: 978-1-62708-180-1
..., and controlled. Nothing lasts and functions forever. For some products, consumers may prefer a shorter life at a more modest cost. In contrast, the useful service life of a product such as an aircraft part may be carefully planned in advance and managed accordingly with routine inspections and maintenance, which...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006753
EISBN: 978-1-62708-295-2
... modest cost. In contrast, the useful service life of a product such as an aircraft part may be carefully planned in advance and managed accordingly with routine inspections and maintenance, which may increase in frequency over time. In many cases, avoiding failures beyond a certain predetermined desired...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006833
EISBN: 978-1-62708-329-4
..., and present design standards? Has traffic loading changed over time? Trucks have gotten allowably heavier over time, and the volume may have changed. Have there been any permitted overweight/oversize loads? Review of inspection and maintenance records will typically be a critical part of any bridge...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.auto.c9001514
EISBN: 978-1-62708-218-1
... there was no indication of a defective weldment that would show up in a visual inspection of the welds themselves. The defective welds were formed due to inadequate current density (possibly in conjunction with inadequate welding time). This is consistent with the microstructure in Figure 9 . It is not known whether...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.pulp.c0090276
EISBN: 978-1-62708-230-3
.... Recommendations included design changes in the head/shell joint, and detailed preventive maintenance inspection procedures were also suggested. Bolts Cracking (fracturing) Design Paper machines Pressure vessels Preventative maintenance Yankee dryer Cast iron (Other, general, or unspecified) fracture...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006815
EISBN: 978-1-62708-329-4
... but also the data, assumptions, specifications, human factors, and organizational factors, the failure analyst can broaden the discovery net when investigating the root cause of failure. Manufacturing, operation, and maintenance may also cause or contribute to a failure, and these aspects are covered...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c9001504
EISBN: 978-1-62708-217-4
... was sealed by an unspecified plug which prevented drainage and drying out of the inside of the beam. Also, since the phenomena of corrosion and SCC are not dependent on flying time, a criterion other than flight time should be used as the basis for inspection or maintenance intervals. Main Landing Gear...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006820
EISBN: 978-1-62708-329-4
... and Fracture Mechanics , Vol 30 , STP 1360, Paris P.C. and Jerina K.L. , Ed., American Society for Testing and Materials , West Conshohocken, PA , 2000 • Muller J. and Errichello R. , How to Inspect a Gearbox , Mach. Lubr. Mag. , Noria Corporation , Tulsa, OK , Feb...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.bldgs.c9001611
EISBN: 978-1-62708-219-8
..., it can be concluded that the primary factors that led to the weld cracking were procedural in nature. The metallographic evaluation revealed a HAZ microstructure that indicated a combination of inadequate maintenance of the preheat temperature coupled with an excessively large heat sink provided...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c9001706
EISBN: 978-1-62708-217-4
... and Results Discussion Conclusions Recommendations References References 1. Boeing Drawing No. 65-65031, Truck Assembly, finished machined, Main gear. 2. Sander K. and Roth M. , QETE Report Number A027288 , ( 1989 ) 3. Boeing Standard Preventive Maintenance...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001594
EISBN: 978-1-62708-229-7
... rates, which means cracks extend from a detectable size to a through-wall crack in a relatively short time. When fatigue cracks grow large enough to be visible to NDE, it is likely that the component is near the end of its useful life. TU Electric has determined that an inspection program designed...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006832
EISBN: 978-1-62708-329-4
... not discovered through internal quality audits and inspections may cause a defective product to become introduced into the stream of commerce. Warnings defects are defects related to inadequate or insufficient instructions and/or warnings. Allegations regarding warnings are either that no warnings...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003509
EISBN: 978-1-62708-180-1
...Abstract Abstract This article briefly reviews the general causes of weldment failures, which may arise from rejection after inspection or failure to pass mechanical testing as well as loss of function in service. It focuses on the general discontinuities observed in welds, and shows how some...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001099
EISBN: 978-1-62708-214-3
... compressor in this refrigeration system, using Freon 11, had operated continuously for about 1000 h since its original installation, at which time it experienced a bearing failure due to inadequate lubrication. This occurrence was unrelated to the failure under discussion, but required disassembly...