Rockwell Collins GPS Receiver GPS-4000S - Reduced Availability of Localizer Performance with Vertical Guidance Procedures
- Published
AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Affected operators should ensure flight crews are aware of the risk and ready to use alternate non-SBAS approaches when planning LPV or RNP APCH procedures. They should also consider Rockwell Collins Operator Service Bulletin 0188-18 instructions and update the GPS-4000S receiver according to Rockwell Collins Service Bulletin GPS-4x00()-34-15 Revision 1. No mandatory compliance deadlines are specified.
Summary
EASA Safety Information Bulletin 2019-05 is a safety information bulletin addressing the reduced availability of Localizer Performance with Vertical Guidance (LPV) procedures for aircraft equipped with the Collins Aerospace GPS-4000S receiver, Part Number 822-2189-100, mod 14 or less. The bulletin highlights an issue where the GPS-4000S receiver may lose lock on the EGNOS satellite and revert to GPS mode without EGNOS corrections, affecting LPV and RNP APCH approaches using GNSS/SBAS geometric altitude.
What changed
This bulletin informs operators and certificate holders about the potential loss of EGNOS corrections in the GPS-4000S receiver, which can interrupt LPV and RNP APCH approaches relying on SBAS geometric altitude. It introduces recommendations for awareness and updates but does not mandate any airworthiness or operational directives.
Why it matters
The issue impacts the availability and continuity of navigation systems during LPV and RNP APCH approaches, potentially compromising approach performance and safety margins. Operators and maintenance teams need to understand this limitation to ensure flight crews are prepared for alternate non-SBAS approaches and to maintain compliance with navigation requirements.
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