success stories

AMS: robust audio and communications management for military aircraft in hostile areas of operations


Airbus Defence & Space


Aerospace and Defense

Capabilities used

  • SW development according to RTCA/DO-178, DAL C
  • HW development according to RTCA/DO-254, DAL C
  • Audio conforms to RTCA/DO-214
  • TEMPEST AMSG 784 Certification
  • EMI/EMC compliant with RTCA/DO-160
  • Environmental Qualification according to RTCA/DO-160 & MIL-STD-810
  • Optical communications


An audio management system was required to meet the needs of the A400M in terms of the diversity of radio systems used (V/UHF #1, V/UHF #2, V/UHF #3, V/UHF #4, HF #1, HF #2, MIDS #A, MIDS #B, SAT #1, SAT #2); radio navigation systems (DF, TACAN, ADF, MKR, VOR); intercom; Clear Audio/Secure Audio (COMSEC); aural announcements (EW: RWR). All this, to operate in electromagnetically hostile environments with high levels of safety, reliability and robustness, and also with civil and military aeronautical certification.


To meet the challenge, Tecnobit's engineering team employed its knowledge and experience in DO-178 critical software development and DO-254 on-board critical hardware for avionics and mission systems. He also used his recognized expertise in secure communications management and aeronautical certification. All this, to provide a system to reduce flight crew workload, improve pilot situational awareness and operate safely and robustly in electromagnetically hostile environments.


Tecnobit's AMS is designed to meet the most demanding requirements from an operational, safety and aeronautical certification point of view. For this purpose, the AMS consists of the following LRU (Line Replaceable Unit):

  • ACP (Audio Control Panel): HMI interface for receiver audio volume adjustment and transmitter selection. Each AMS includes six ACP distributed throughout the aircraft.
  • AEU T1 (Audio UnitType 1): allows the connection of headphones and microphones. Each MSA has eight Type 1 EUAs.
  • AEU T2 (Audio UnitType 2): management of V/UHF radios, in clear and secure audio mode. Each MSA has four Type 2 EUAs.
  • EAMU (Emergency Audio Management Unit): audio management for emergency mode communications. Each AMS includes an EAMU.
  • AMU (Audio Management Unit): audio management for normal mode communications. Each AMS has two AMUs.


The AMS has been combat tested with the A400M on several missions, proving to reduce pilot workload, reduce operational fatigue, improve audio signal intelligibility and pilot communications, and manage secure communications in an electromagnetic spectrum with high electronic warfare intensity. Drastically improving communications in the battlespace.


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