What happened
On 5 November 2000, a BAe 146-200, registration G-JEAK, was performing a descent into Birmingham Airport. During the approach, the crew noted unusual odors described as an "oily petrol" smell within the cabin. Following these reports, the first officer initiated a procedure to investigate the source of the odor. The incident involved the aircraft operating for British European.
The investigation
The AAIB conducted a technical examination of the aircraft's systems, specifically focusing on the engine and Auxiliary Power Unit (APU) oil sealing. The investigation looked into the pneumatic bleed air system and the Environmental Control System (ECS) to determine how contaminants might enter the cabin air supply. Researchers also examined the potential for engine or APU lubrication oils to leak into the air conditioning packs. Additionally, the investigation reviewed the chemical composition of the odors and the physiological effects of such contaminants on the crew.
Findings
- The investigation identified that oil leakage from the engine or APU into the pneumatic system was the primary mechanism for air contamination.
- The presence of contaminants in the cabin air supply was linked to the leakage of lubrication oils into the environmental control system.
- The investigation considered the potential for various compounds to enter the flight deck and cabin air supplies.
- The crew's response to the odor was evaluated in the context of standard operating procedures for suspected air contamination.