EASA SIB 2008-73
FAA SAIB NM-08-39 - Honeywell Flight Management System (FMS) - Early Descent Behaviour
FAA SAIB NM-08-39 is a Special Airworthiness Information Bulletin addressing premature descent behavior in certain Honeywell Flight Management Systems (FMS) when coupled to VNAV or VGP. The affected FMS units include Honeywell Epic Integrated Avionics and Legacy FMZ-2000 models installed on various aircraft such as Boeing 727 series, Bombardier CL-600 series, Cessna 650, Dassault Falcon series, Gulfstream G-1159, G-IV, GV, and Hawker Beechcraft HS125 and BAe125 series. The bulletin informs operators about incorrect vertical deviation indications that may lead to early descent below the intended flight path during RNAV approaches.
Safety Information BulletinFlight OpsSafety MgmtBoeing 727Bombardier CL-600Cessna 650Dassault FalconGulfstream G-1159Gulfstream G-IVGulfstream GVHawker Beechcraft HS125BAe 125