Acoustic Ultrasound in Commercial Aviation

CTRL UL101 Troubleshooter for Boeing (B00033) Included in the Aircraft Maintenance Manual (AMM) for all Boeing Commercial Jet Aircrafts (717-787 Series)

CTRL Systems is pleased to be vetted and approved for AOG diagnostics for all Boeing Commercial Jet Aircraft. The CTRL UL101 Troubleshooter for Boeing (part number B00033; Boeing Tool Tag SPL-1473) is the ultrasound listening device (ULD) of choice for “Ultrasonic Leak Checks,” as published in the December 2019 revision of all Boeing Commercial Jet Aircraft Maintenance Manual (AMM).

  • Pressurization Leak Checks

  • Air Conditioning Leak Checks

  • Bleed Air Check (Engine & Airframe)

  • Hydraulic Bypassing

  • Pitot Static Check

  • Oxygen

  • Evacuation Slides, Tires & Other Pressure Components

The UL101 is also listed as a Boeing Tool with the Tag number COM-1473 and PN B00033. The 737NG FIM ATA 23-44 for Parking Brake troubleshooting is published and the UL101 is listed as a tool for ultrasonic troubleshooting in the 737NG AMM ATA 20-10-79. 


A member of Boeing’s Maintenance and Ground Operations Systems (MGOS) uses the UL101 Troubleshooter to perform a bleed air check on a Boeing 757. Bleed Air Checks (Engine & Airframe) is just one of the many applications vetted and approved in the December 2019 revision of the Boeing Commercial Jet AMM


Pitot Static System Check

4 hours 

➔ 30 min

Cabin Pressure Testing

8 hours 

➔ 15 min

Engine Air Bleed Check

2 hours 

➔ 15 min

According to Boeing’s “Charlie Works” team, the UL101 Troubleshooter for Boeing reduces the time required to pinpoint bleed air system and pressurization leaks from days to an hour or less.