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A view of the fractured truck beam of the main landing gear (MLG) at the si...

in Failure Investigation of a Structural Component of the Main Landing Gear of a Transport Aircraft > ASM Failure Analysis Case Histories: Air and Spacecraft
Published: 01 June 2019
Fig. 1 A view of the fractured truck beam of the main landing gear (MLG) at the site of failure. More
Image

EDX analysis of the MLG truck beam material. The constituents correspond to...

in Failure Investigation of a Structural Component of the Main Landing Gear of a Transport Aircraft > ASM Failure Analysis Case Histories: Air and Spacecraft
Published: 01 June 2019
Fig. 15 EDX analysis of the MLG truck beam material. The constituents correspond to 4340 steel. More
Book Chapter

Failure Investigation of a Structural Component of the Main Landing Gear of a Transport Aircraft

By A.M. Abdel-Latif, M. Roth, M. Yanishcvsky
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
... of the failed beam could not be conclusively established because of the long term service exposure and presence of lubricants. Aircraft Boeing 707 Corrosion MLG SCC Truck beam 4340 UNS G43400 Stress-corrosion cracking Pitting corrosion Background Approximately 30 minutes after a Canadian...
Abstract
The truck beam of the left main landing gear (MGL) of a Boeing 707 airplane collapsed on the ground just after the aircraft was unloaded and refueled. The investigation revealed that failure was caused by the propagation of an intergranular crack originating from the bottom of the pit. The crack reached the critical size and caused failure by stress-corrosion cracking (SCC) under static loading conditions in service. The failed beam was protected by a well adhering paint system. However, the presence of adequate amounts of corrosion preventive compound films (CPC) on the surfaces of the failed beam could not be conclusively established because of the long term service exposure and presence of lubricants.
Image

An overview of the corrosion pit that had caused the SCC failure of a simil...

in Failure Investigation of a Structural Component of the Main Landing Gear of a Transport Aircraft > ASM Failure Analysis Case Histories: Air and Spacecraft
Published: 01 June 2019
Fig. 20 An overview of the corrosion pit that had caused the SCC failure of a similar MLG truck beam of a Boeing 707 in 1988. Note the similarities with Figure 7 . More