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The Boeing 717-200 was taxiing at Cairns Qld for a scheduled service to Brisbane Qld. As part of the preparation for the flight, the crew had entered flight plan details into the aircraft's flight management system (FMS). While taxiing, due to intermittent rain showers at Cairns, the 717 crew then programmed the FMS with wet runway speed figures for takeoff.

The crew reported that late in the take-off roll the manually entered wet speeds were lost from the airspeed tape on the primary flight display and FMS-generated speeds were displayed. At rotation 'MAP FAIL' appeared on both navigation displays.

The investigation found that flight management computer (FMC) 2 was unable to sequence the '400 ft course to altitude' leg associated with the SWIFT SIX standard instrument departure. Eventually, FMC 2 performed a software reset but was unable to recover and became unavailable for use by the crew. A similar progression then occurred for FMC 1 but, in accordance with its design, FMC 1 remained available for use but with the flight plan information cleared.

Eventually the crew were able to enter the instrument landing system frequency, but FMS operation did not appear to be reliable. The aircraft was radar vectored for a return to Cairns while maintaining visual meteorological conditions. The crew conducted a visual approach to runway 15 and the aircraft landed 32 minutes after takeoff.

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