Amateur-built CHRISTEN EAGLE II N80BH accident near Pearland, Texas

Probable cause

A loose B nut on the fuel inlet line due to maintenance personnel’s application of insufficient torque on the nut at an unknown time, which resulted in a fuel leak and a subsequent total loss of engine power during initial climb.

NTSB analysis

The airplane's engine experienced a total loss of power during initial climb, and the pilot subsequently attempted to turn back toward the airport but was unable to reach the airport or a suitable forced landing area. The airplane impacted trees and terrain, resulting in substantial damage to the fuselage and both wings. A large fuel spill occurred, but no postimpact fire ensued. A postaccident examination of the wreckage revealed that a B nut attaching the fuel supply line was only "finger tight" and was able to be loosened with finger pressure. Further, evidence of dye from a fuel stain was observed near the loose B nut. A review of maintenance records revealed that maintenance had recently been performed in that area of the engine; however, when the insufficient torque was applied to the B nut could not be determined.

Text from the NTSB. Open the NTSB docket for CEN12LA253 for the full record.