| Date of Accident: | 07 November 1996 |  |
| Airline: | Aviation Development Corporation |  |
| Aircraft: | Boeing 727-231 | |
| Location: | Imota, Nigeria | |
| Registration: | 5N-BBF | |
| Previous Registrations: | N64321 | |
| Flight Number: | 86 | |
| Fatalities: | 143:143 | |
| MSN: | 20054 | |
| Line Number: | 718 | |
| Engine Manufacturer: | Pratt & Whitney | |
| Engine Model: | JT8D-9A | |
| Year of Delivery: | 1969 | |
| Accident Description: | The ADC aircraft was flying at FL240 en route from Port Harcourt to Lagos. At the same time a Triax aircraft had departed Lagos and was flying at FL160 towards Enugu. The Lagos controller had terminated contact with the Triax aircraft when the ADC crew requested to descend. The permission to descend was delayed to allow an ELF Petroleum business jet to pass beneath the 727 at FL210. When the controller finally cleared the ADC flight to descend, he thought he had cleared to aircraft to FL100 at an earlier stage, but the aircraft was still flying at FL240. When the ADC aircraft descended through FL160, the TCAS alarm sounded. To avoid a head-on collision the flightcrew immediately took evasive action. During this maneuver, the Boeing rolled to an excessive bank angle and conrol was lost. Within 16 seconds speed had increased from 280kts to almost the speed of sound. The aircraft crashed and disintegrated on impact. |
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