EASA SIB NM-15-11
Honeywell Enhanced Ground Proximity Warning System
Summary
The FAA Special Airworthiness Information Bulletin SAIB: NM-15-11 provides information regarding potential safety improvements to the Honeywell Enhanced Ground Proximity Warning System (EGPWS) software with part number 965-0976-0xx-218-218 and later. This bulletin is relevant to transport category airplanes equipped with Honeywell EGPWS, including Airbus A300 and other models using specified part numbers. The document highlights the importance of upgrading to the latest software versions to enhance terrain alerting capabilities.
What Changed
The bulletin recommends upgrading Honeywell EGPWS software to versions with part numbers 965-0976-0xx-218-218 or later, which include improved thresholds for the 'TOO LOW TERRAIN' alert. These software updates provide earlier and higher altitude warnings compared to previous versions. The update applies to various Honeywell EGPWS models including MK V, MK VI, MK VII, MK VIII, and versions installed in Gulfstream, Dassault, Cessna, and Embraer aircraft with Primus Epic cockpits.
Why It Matters
Upgrading to the latest Honeywell EGPWS software enhances flight safety by providing earlier terrain alerts, potentially preventing controlled flight into terrain (CFIT) accidents. Operators and maintenance teams benefit from improved situational awareness and a greater margin of safety during critical flight phases. Compliance with this recommendation supports adherence to best safety practices and reduces risk exposure.
What To Do
Owners and operators of transport category airplanes equipped with the specified Honeywell EGPWS software should upgrade to the latest software versions identified by the relevant part numbers. Additionally, operators are advised to use GPS-updated Flight Management Systems (FMS) and, where possible, connect GPS directly to the EGPWS for accurate position data. No mandatory compliance deadline is specified, but timely upgrade is recommended to maximize safety benefits.