SMART sensor solutions

Airframe Crack Detection Compliance

Reliable at-the-gate crack inspections
Increased incremental flying time revenue
In-Situ Non-Destructive Maintenance

Why CVM™?


Comparative Vacuum Monitoring (CVM™) smart sensors significantly reduce the time and labor maintenance crews spend monitoring and inspecting airframes for cracks. In what used to take days in the hangar now takes minutes at the gate.

Revolutionize your maintenance program and replace costly inspections at heavy and out-of-sequence checks, and restore thousands of flight hours back to the network across your entire commercial fleet each year.

CVM™ is the first FAA certified, non-destructive, failsafe at-the-gate structural monitoring solution for achieving condition-based maintenance.

Replace hangar time with at-the-gate inspections
Restore valuable flight hours to the network
Shift to condition-based maintenance programs
Aft Pressure Bulkhead Installation and Inspection Using CVM™ Service Bulletin (Pending) B737NG: (737-600, 737-700, 737-800, 737-900)
Center Wing Box, Front Spar Shear Fitting Inspection Using CVM™ 737-57-1309 Rev 1 B737NG: (737-600, 737-700, 737-800, 737-900)
Intelsat (Gogo) Wi-Fi Antenna CVM™ Installation FAA STC ST04103NY B737-800 Series
*The FAA published an Issue Paper (IP) on Structural Health Monitoring that identifies the use of CVM™ to reliably detect airframe damage for compliance. The IP, in conjunction with our pending APB certifications, pave the way for future aircraft applications.

CVMTM Sensors Generate Significant Value for Airlines

Ground-breaking technology to broaden the maintenance program, shrink the maintenance footprint and give significant ‘green time’ back to the operator.
Allows engineers to effectively mitigate impact of future Service Bulletins, FCDs, and new fatigue areas. Sensors can be designed and adapted to monitor almost any surface area of concern.
No time wasted. Work card becomes easily managed. Future changes and updates enhance the maintenance program in many ways.
Allows planning to connect to the aircraft without impacts to flight or maintenance operations. Enhances flexibility of high-frequency, low-impact inspections. Saves time, and reduces workload conflict, and improves the general flow of the visit.
Eliminates false negatives. It’s a ‘go/no-go’ gauge when it comes to structures. No sample calibration mishaps; no tight areas for probe position. Virtually eliminates human error during inspections.
Enables elevated inspection frequencies, with little to no impact on the day-to-day operations. Eliminates false negative readings, removing the significant rework of and open-up for no crack verification and compliance.
Flight Hours Restored
Flight Days Gained
Labor Hours Avoided
projected annual APB application Benefits across 737NG fleet of 71 aircraft

Source: Delta Air Lines


CVM™ technology involves installing smart sensors to vulnerable airframe structure where damage is anticipated to occur. Using a PM200 hand-held diagnostics device, maintenance staff simply connect to the aircraft’s CVM™ sensor arrays to monitor and detect if surface imperfections exist or if there’s a loss in structural integrity.

Confirming airworthiness has never been easier

CVMTM sensors are typically installed on hard-to-access structures of an airframe where fatigue is expected or inspections are required.


The array of sensors connect to a socket installed in an accessible location on the aircraft for easy periodic inspection with the handheld diagnostics device at required intervals.


The device applies vacuum pressure to the sensors in a 10-15 minute test. If vacuum is maintained, no crack exists. Otherwise a crack may exist and further investigation is required.


The diagnostics device stores all test results for easy data access and export.

Industry Insights


12 Oct: CVM™ B737 APB application testing and certification update

An update regarding Anodyne Electronics Manufacturing Corp. (AEM)’s Comparative Vacuum Monitoring (CVM™ ) Smart Sensor Solutions.

25 Sep: AEM and TESTIA pen CVM™ sensor installation training agreement

AEM and non-destructive testing consultants and service provider TESTIA sign letter of intent for CVM™ sensor installation training.

21 Sep: CVM™ wins Airlines for America Innovation Award

Comparative Vacuum Monitoring (CVM™) technology recognized by Airlines for America (A4A) for first FAA-approved application for structural health monitoring.

26 Jan: Ground-breaking sale of CVM™ technology

Structural Monitoring Systems Plc (SMS) is very pleased to announce that it has secured the first commercial sales of its ground-breaking Comparative Vacuum Monitoring (CVM™) technology.

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