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Inspection of Landing Gear


In today's aerospace market, the reliability of airplanes is more than ever a prime concern because airlines companies are trying to make their fleet last longer. To reach this goal safely, these companies must perform more inspections in order to ensure customer safety.

Some of the parts that have required inspection lately include landing gears, which are subject to intense stress upon takeoffs and landings. The section that must be inspected is a cylinder possessing three different diameters in the zone of interest. The best way to inspect that zone is to use a phased-array technique with steering capabilities to simultaneously fire 40- to 70-degree shear wave refracted angles in the part.
The adapted wedge and the combination of angles provided by the phased array system allow the complete inspection of the zone of interest in a single pass.
Some of the advantages of such a technique, in comparison to standard techniques, are the simplicity (performing a single one-line scan instead of a raster scan) and the ability to cover a complete volume using multiple angles at the same time. With this system, any inspector can perform the inspection faster and with better reliability.

Typical Inspection Requirements
  • Adapted probe and wedge to the curved surface
  • A-scan, B-scan, and sectorial scan displays
  • Storage of a one-line scan for analysis
  • Landing gear diameter: 5 in. (127 mm) to 8 in. (203.2 mm)
  • Part thickness: 0.5 in. (12.7 mm) to 1.5 in. (38.1)
  • User-friendly operating system
  • Portable system
  • Inclusion
  • Crack
Description of the Solution
  • Manual inspection using one small phased-array probe
  • One-line scan at around 12 mm/s (0.472 in.)
  • Inspection with 40- to 70-degree refracted angle
  • Real-time display of A-scan, B-scan, and sectorial scan
  • Storage of a one-line scan for analysis

Material Requirements

Inspection Method
The probe is configured to perform an sectorial scan from 40 to 70 degrees in the OmniScan software. The display and gain level are adjusted on flat bottom holes, and ID and OD notches using a mock-up of the real landing gear.
The scan then performs one longitudinal scan around the landing gear. The image is frozen and analyzed using A-scans, B-scans, and sectorial scans. Finally, if the piece is rejected, the scan is stored and kept for records.

Olympus IMS

应用所使用的产品
OmniScan X3系列的每台探伤仪都是一款功能齐备的相控阵工具箱。其创新型全聚焦方式(TFM)和高级相控阵(PA)功能助力您充满信心地识别缺陷,其性能强大的软件功能和便捷的工作流程有助于提高您的检测效率。
轻便的单组Omniscan SX探伤仪装有一个方便用户阅读的8.4英寸(21.3厘米)触摸屏,可提供性价比很高的检测解决方案。OmniScan SX有两种型号:SX PA和SX UT。SX PA是一个16:64PR仪器,它与仅使用UT技术的SX UT一样,配备有一个用于脉冲回波、一发一收或TOFD(衍射时差)检测的常规UT通道。
OmniScan MX2现在不仅可以与带有一个UT通道的相控阵模块(PA2)及一个用于TOFD(衍射时差)检测的双通道常规超声模块(UT2)配套使用,还可以使用一些创新型软件程序。这些软件程序更进一步提高了业已相当成功的OmniScan MX2平台的性能。
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