Transport Canada CF-2020-18

Requires incorporating a temporary revision to the rotorcraft flight manual (RFM) limiting the use of map-mode to the center display unit for Bell 429 models equipped with Rogerson Kratos display units and Garmin GTN750/650 main software version 6.21 or later. The use of map-mode is prohibited on both the right- and left-hand-side display units, if installed. The RFM Supplement temporary revision also introduces a new emergency and malfunction procedure in the event of center display unit failure. Prompted by in-service reports of the loss of display and subsequent recovery of the Rogerson Kratos display unit. During an IFR approach, a Bell 429 lost its center display, which then rebooted, and subsequently lost its right-hand-side display, which then also rebooted. Investigation revealed that the display units’ power cycle occurred while in map-mode, which was caused by the Rogerson Kratos display's limited processing capability for excessive null waypoints generated by the Garmin GTN750/650.