Incident Overview
While on final approach to an airport, a flight declared an emergency due to smoke in the cockpit. Shortly after declaring the emergency, the aircraft landed without further incident. The emergency was prompted by the presence of smoke, which the crew detected in the cockpit area.
Post-Flight Inspection
After landing, maintenance personnel performed a post-flight inspection of the aircraft. The inspection revealed a significant oil leak originating from the auxiliary power unit (APU). Additionally, the maintenance team reported that the oil leaking from the APU had contaminated the environmental system. This contamination was identified as the direct cause of the smoke in the cockpit.
Maintenance Findings
The oil leak from the APU was described as significant. The leaked oil entered the environmental system, leading to the smoke condition. No other abnormalities were noted during the inspection. The aircraft landed without incident following the emergency declaration.
Conclusion
The smoke in the cockpit was traced to an oil leak from the auxiliary power unit that contaminated the environmental system. The crew's response to the emergency and subsequent safe landing concluded the event.