Incident Overview
A pilot reported that while taxiing, he applied braking and left rudder control inputs to execute a left turn. The aircraft did not respond as expected, continuing to gain speed straight ahead. It subsequently exited the taxiway and struck a building.
Brake System Examination
Components from the aircraft's brake system were subjected to acceptance tests. All components passed, with the exception of those that had been damaged in the collision.
Cockpit Voice Recorder and Checklist Analysis
Transcripts of recorded cockpit voice recorder (CVR) information were compared with procedures specified in the aircraft operating checklist. There was no correlation or consistency between the transcripts of the captain and copilot's recorded conversations and the procedures specified in the aircraft checklist.
Emergency Brake System
Examination of the aircraft revealed that the emergency braking system had not been activated on the accident aircraft. This activation is specified in the taxi procedures located in section III of the aircraft operating manual. The taxi procedures state that the pilot should operate the emergency brake system when a hard braking condition or a no braking condition is encountered. The emergency brake control is located under the left instrument panel.