ADC airlines seem to have a pretty appalling accident history, especially for an airline with so few aircraft. From Wikipedia:
The 1990s saw a number of accidents with ADC Airlines planes. In August 1994 and July 1995 two DC-9-31s were written off in non-fatal accidents, both at Monrovia-Spriggs Payne Airport. On 7 November 1996 a Boeing 727-231 en route from Port Harcourt to Lagos went out of control and crashed after a near miss incident killing all 143 on board. On 29 July 1997 a BAC One-Eleven 203AE landing at Calabar overshot the runway and an engine caught fire. There was one fatality.