EASA SIB 2021-03R1
Loss of Air Traffic Control Tracking on Boeing 787 Aeroplanes in European Airspace
Summary
EASA Safety Information Bulletin 2021-03R1 is an airworthiness bulletin addressing intermittent loss of Air Traffic Control tracking on Boeing 787-8, 787-9, and 787-10 aeroplanes equipped with the Integrated Surveillance System Processor Unit (ISSPU), Part Number 822-2120-102. The bulletin highlights that these tracking losses occur in European airspace without alerting the flight crew through onboard systems. It provides information on the issue and references corrective actions from Collins Aerospace to mitigate the problem.
What Changed
This revision of EASA SIB 2021-03 updates the recommendations section to confirm that implementing Collins Aerospace Service Bulletin ISS-2100-34-18 is a terminating action for the loss of tracking issue. It clarifies that the safety concern does not currently warrant mandatory Airworthiness Directive action under EU regulations.
Why It Matters
This bulletin is important for aviation professionals because the loss of ATC tracking increases workload for controllers and distracts both pilots and ATC personnel. Operators and maintenance teams need to be aware of the issue to maintain situational awareness and ensure timely mitigation to avoid operational disruptions and maintain safe air traffic management.
What To Do
Operators of Boeing 787 aeroplanes with the affected ISSPU units are recommended to send these units to Collins Aerospace for modification according to Service Bulletin ISS-2100-34-18. While this action is not mandatory, it is advised to restore tracking reliability and reduce ATC workload. No specific compliance deadline is stated.