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Landing gear, corrosion

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Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c9001542
EISBN: 978-1-62708-217-4
...Abstract Abstract A nose landing gear cylinder made from AISI 4340 Ni-Cr-Mo alloy steel was found cracked and leaking, causing partial depressurization. Investigation revealed the crack to be a stress-corrosion type, judging by the 6500x electron fractograph. It had started in a region...
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
.... A corrosion preventive compound was also applied to newly manufactured parts for additional protection. Fig. 1 a: Fractured main landing gear truck beam with axles. b: Overview of the fracture surface, the semicircular stress corrosion crack can be seen at bottom just right of centre (arrow...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c9001717
EISBN: 978-1-62708-217-4
... procedure, and qualified two Army maintenance facilities for field repair of these components. Grain size Helicopters Intergranular corrosion Landing gear mounts 18Ni (300) Corrosion fatigue Stress-corrosion cracking Pitting corrosion Introduction Manufacturing Criteria Miscellaneous...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001020
EISBN: 978-1-62708-214-3
... for this service in this condition, because the alloy is an age-hardenable grade and its resistance to stress corrosion can be influenced by temper or age-hardening heat treatment. Most Probable Cause Remedial Action The aircraft had an 18,000 kg (40,000 lb) gross landing weight and tricycle landing gear...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c0048665
EISBN: 978-1-62708-217-4
... examination. It was concluded that stress-corrosion cracks grew out from the rust pits. The pin material was changed from 300M steel to PH 13-8 Mo stainless steel, which is highly resistant to rusting and SCC and the jacking control system was modified to prevent overdriving. Landing gear Materials...
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
...Abstract Abstract Fretting and/or fretting corrosion fatigue have been observed on such parts as main rotor counterweight tie rods, fixed-pitch propeller blades, propeller blade clamps, pressure regulator lines, and landing gear support brackets. Microcracks started from severe corrosion pits...
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
... the latest failure occurrence. Visual Examination Metallographic Examination Fractographic Examination Chemical Analysis of the Residue and Coatings Visual Inspection Corrosion Prevention Metallurgical and Fractographic Assessment The left-hand main landing gear (MLG) truck beam...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001022
EISBN: 978-1-62708-214-3
... and adjoining wall between the steel sleeve and the steel diaphragm washer. Metallographic analysis and accelerated corrosion tests showed that the cracks had originated as stress-corrosion failures. Forgings, corrosion Landing gear, corrosion 2014 UNS A92014 Intergranular corrosion Stress-corrosion...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c9001538
EISBN: 978-1-62708-217-4
...Abstract Abstract Examination of a cracked nose landing gear cylinder made of AISI 4340 Cr-Mo-Ni alloy steel proved that the part started to fail on the inside diam. When the nucleus of the stress-corrosion crack was studied in detail, iron oxide was found on the fracture surface. A 6500x...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c9001746
EISBN: 978-1-62708-217-4
...Abstract Abstract Brittle intergranular fracture, typical of a hydrogen-induced delayed failure, caused the failure of an AISI 4340 Cr-Mo-Ni landing gear beam. Corrosion resulting from protective coating damage released nascent hydrogen, which diffused into the steel under the influence...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c9001731
EISBN: 978-1-62708-217-4
... is parked or taxiing or being towed, and not during landing when the gear may be subjected to extremely high shock and vibration loads. Many of the failures have been attributed to stress-corrosion or to “delayed” fracture starting in areas where the surface had been damaged. Either mechanical...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001292
EISBN: 978-1-62708-215-0
...Abstract Abstract A crack was detected in one arm of the right-hand horizontal brace of the nose landing gear shock strut from a large military aircraft. The shock strut was manufactured from a 7049 aluminum alloy forging in the shape of a delta. A laboratory investigation was conducted...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001025
EISBN: 978-1-62708-214-3
...Abstract Abstract A piece of wheel flange separated from the main landing gear wheel of a C130 aircraft as it taxied on a runway. The wheel was a 2014-T61 aluminum alloy forging and had been in service nearly 20 years. Fractographic evidence indicated that the initial crack growth was caused...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c9001707
EISBN: 978-1-62708-217-4
...Abstract Abstract The failures of two aircraft components, one from a landing gear and the other from an ejector rack mechanism, were investigated. Both were made from PH 13-8 Mo (UNS S13800) precipitation-hardening stainless steel which had been heat treated to the H1000 and H950 tempers...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c0006413
EISBN: 978-1-62708-217-4
... stress-corrosion cracks which were present before the landing. It was recommended that an inspection for SCC be made of all pylon struts with a similar service life. Landing gear Scanning electron microscopy Stresses 7075 UNS A97075 Stress-corrosion cracking A pylon strut was submitted...
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
... takeoff from Paris-Charles de Gaulle International Airport. During takeoff, one of the tires on the left main landing gear was cut by a piece of metallic debris on the runway ( Fig. 1 ). Failure of the tire sent pieces of debris into the underside of the airplane and left wheel well. A large piece...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001291
EISBN: 978-1-62708-215-0
...Abstract Abstract Examination of several fighter aircraft main landing gear legs revealed unusual cracking in the hard chromium plating that covered the sliding section of the inner strut. The cracking was associated with cracks in the 35 NCD 16 steel beneath the plating. A detailed...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001030
EISBN: 978-1-62708-214-3
... of surface finish. Corrosion products and corrosion pitting were visible in some holes ( Fig. 4 ). Corrosion protection in the form of paint or sealant was sparse to nonexistent in and around the fastener holes. The proximity of the main landing gear well to the D6ac steel frame and the crevices produced...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006836
EISBN: 978-1-62708-329-4
... conditions. Changes in operating conditions that are thought to be only minor deviations from normal sometimes prove to be the cause of spring failure. Example 18: Fracture of a Landing-Gear Flat Spring Example 19: Failure of a Retainer Spring Because of Cyclic Loading and Torsional Vibration...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0001813
EISBN: 978-1-62708-180-1
...-gear spring, 6150 steel, that broke during a hard landing. (a) Configuration and dimensions (given in inches) of the spring. (b) Fractograph showing fatigue crack that initiated the brittle fracture. 7× Fig. 3 Valve-spring failure due to residual shrinkage pipe. (a) Macrograph showing...