Press Release: COMAC to offer Teledyne real-time monitoring on ARJ21


Teledyne Controls, the Flight Data Management business, has announced a partnership with the Chinese aircraft manufacturer COMAC to build a Real Time Monitoring System (RTMS) for ARJ21 aircraft.

At the heart of the solution is the Teledyne Controls’ Real-time Monitoring Unit (RTMU) that will be used in all ARJ21 aircraft after the unit’s certification. The RTMU provides COMAC with a state-of-the-art hardware and software solution for data acquisition, aircraft condition monitoring and data recording.

“The purpose of the RTMU is to acquire and monitor the aircraft parameters,” explains Richard Huang, Teledyne Controls’ Director of Marketing and Sales for the Asia Pacific Region. “If any parameters are outside of the norm, it will generate and downlink the reports via ACARS in real-time to notify the airline operator and/or the aircraft manufacturer. The operator/manufacturer can then take the appropriate action in a timely manner, supporting operational safety and efficiency.

“The RTMU also records and downlinks continuous raw data after the aircraft lands. This is achieved via Teledyne’s GroundLink® Comm+ systems that are already installed on the ARJ21. This data can be used for aircraft system condition monitoring, performance trending and operational quality assurance.”

Mr. Huang says that the RTMU architecture is based on proven data acquisition and management technology that has been used and certified on multiple Boeing and Airbus aircraft: “The RTMU combines the fully-programmable Aircraft Condition Monitoring System (ACMS) processing capability of the Teledyne Data Management Unit with the internal recording capabilities of the Teledyne Quick Access Recorder.”

COMAC sees the RTMU as delivering a number of key benefits:

  • ACMS Programming Capabilities: The ultimate power of the solution is enhanced by the ACMS capabilities. Teledyne Controls’ PC Based Application Generation Station (AGS) provides a mechanism for operators to fully customize ACMS application software. AGS-generated application software is uploadable, and therefore allow the users to maintain and modify their ACMS application software on the aircraft, resulting in a significant time and cost savings. Using the AGS, operators can: customize the aircraft parameters to acquire, monitor, and/or record; modify display screens (CDU/MCDU); customize report format and content; and establish report generation conditions.
  • Partitioned ACMS Applications: The ability to create ‘Partitioned Applications’ (via AGS) will allow COMAC to maintain a set of ACMS functions (reports, recording map, trigger logic) that are ‘partitioned’ from the customized ACMS functions specific to the airline.
  • ACMS Validation: To support both the aircraft manufacturer and the airlines in developing customized applications, the ACMS Tester software is a PC-based tool used to verify the ACMS functions on a virtual machine prior to the aircraft installation. With the ACMS Tester, users can compose and run scenario files to simulate events, trigger reports and generate recording files. They can also send uplink commands and navigate through MCDU screens.
  • ACMS Report downlink via GroundLink® Comm+ system: Teledyne’s RTMU features an RS422 interface to transmit ACMS reports to Teledyne’s GroundLink® Comm+ system. ACARS can be expensive and its bandwidth is very limited. With this RS422 interface, non-time-critical reports (such as engine trending monitoring, fuel usage, APU usage, etc.) can be sent via the Teledyne GroundLink® Comm+ system and distributed to the users via cellular network wirelessly and automatically. This also allows the users to develop large ACMS reports without considering the bandwidth constraint of ACARS network.

The first RTMS-equipped ARJ21 aircraft is expected to be delivered in Q4 2018 or early 2019. Over 450 ARJ21 aircraft have been ordered by more than 20 customers.

Teledyne Controls’ China-based team, which has representation in Guangzhou, Shanghai and Beijing, works with the majority of Chinese airlines, and has done so for more than 20 years.


About Teledyne Controls

Headquartered in Southern California, Teledyne Controls LLC is a wholly owned subsidiary of Teledyne Technologies Incorporated. Teledyne Controls is a leading manufacturer and innovator of a wide range of data management solutions designed to help aircraft operators collect, analyze and distribute aircraft data more efficiently. Teledyne Controls maintains worldwide facilities and a global network of field representatives to support its many airline, airframe, and military customers. Additional information about Teledyne Controls can be found at

About Teledyne Technologies Incorporated

Teledyne Technologies is a leading provider of sophisticated instrumentation, digital imaging products and software, aerospace and defense electronics, and engineered systems. Teledyne Technologies’ operations are primarily located in the United States, Canada, the United Kingdom, and Western and Northern Europe. For more information, visit Teledyne Technologies’ website at