The aircraft B1900D, call sign TWD 8300 on 15th March 2008 filed a flight plan with Air Traffic Services (ATS) reporting office at Murtala Muhammed Airport (MMA) Lagos for departure to Bebi airstrip, OBUDU routing Lagos (LAG) – POTGO – Enugu (ENG) direct to Bebi.
The Aircraft departed MMA at 0636 hours climbing to twenty five thousand feet, FL250 above mean sea level (AMSL) estimating POTGO at 0736 hours and Bebi at 0821 hours. It was transferred to Port Harcourt at 0745 hours and released to Enugu at 0756 hours descending to eleven thousand feet (FL110) AMSL at 0805 hours while passing sixteen thousand feet (FL160) AMSL requested for further descent and was cleared by Enugu tower to descend to five thousand feet (FL050) AMSL. The aircraft deviated from the filed flight plan route, and flew through the airway (UA609) direct to IKROP when it was to have turned left from the airway at POTGO for Enugu and direct to Bebi in OBUDU. The crew was confused at IKROP in navigating to Bebi, they made several input into GPS of the OBUDU position but results were not the same. The crew after several “Terrain” and “pull up” warnings which were not responded to, flew into terrain and crashed.