Event Overview
During the takeoff initial climb, the flight crew received an aural warning and observed illumination of the number 2 smoke detector sensor light in the cockpit. Concurrently, crew members noted a strong odor resembling lacquer and varnish emanating from the cargo area. Despite the warning, no evidence of an in-flight fire or hazardous cargo spill was found in any cargo container.
Cargo Examination
Subsequent inspection revealed wood panels stored in cargo bin 5. These panels had been painted earlier that day with a base coat (Kem-Flash E61A45) and a topcoat (Production Lacquer L61XX Lead-Free Custom). The ramp agent who loaded the boxes into the cargo container reported no perception of smell or fumes at the time of loading.
Paint and Hazard Assessment
Painted panels may emit a paint-like odor during the curing process. However, once the paint has been applied to the panels, the material is not classified as hazardous and is considered nonflammable even while still in the curing stage.
Smoke Detector Verification
The smoke detector, Part No. 7740-01, Serial No. 2024, operates based on the percentage of light transmitted. Functional testing confirmed that the detector operated within the manufacturer's specified parameters, indicating no malfunction.
Conclusion
The source does not provide a probable cause for the event. No causal or contributory factors are stated in the investigation report.