DA40 Diamond star flight crew reported corrosion and brake system component failures leading to unsuccessful attempts to release brakes. Flight crew also reported propeller strike with ground during incident.
Synopsis
DA40 Diamond star flight crew reported corrosion and brake system component failures leading to unsuccessful attempts to release brakes. Flight crew also reported propeller strike with ground during incident.
Narrative
Upon reaching the hold short line at 1; number 3 in sequence for departure; we set the parking brake and turned the taxi light off per SOP. Once plane #1 in sequence was given departure clearance; we released the parking brake and began to add power to move up. When adding approximately 20% - 30% power; the left brake did not release; causing the plane to pivot around the left main gear and turn in a circle. We tried to troubleshooting; releasing the brake and pumping multiple times to try and get the valve to clear however the same left main gear brake was completely locked up. Unable to get the pressure to release; we requested and got permission from ground to shutdown the aircraft and egress; as we were stuck on a taxiway and unable to move the aircraft. Once outside; we inspected the aircraft and saw that a prop strike occurred while the left main gear brake was stuck; striking all 3 prop blades. There was no previous indication from inside the cockpit while the engine was on that the prop strike occurred. n
Second reporter narrative
During Taxi out to active runway; we were number 3 plane holding short of runway XX. Stopped the aircraft; turned taxi light off; parking brake was set. After 1st plane departed; we turned Taxi light back on; and released parking brake to move forward with 20-30% load. The left main brake was locked thus causing plane to pivot around the left main. Me and other pilot began to trouble shoot by locking and re releasing the parking brake and pumping the brakes to potentially release the lock. After unsuccessful attempts of brake releasing; we gave Ground/Tower Frequency the situation and got permission to shut down aircraft; egress; and try to attempt to move the aircraft. After exiting the aircraft; this is where we noticed all 3 props had been struck. There was no indication from inside the aircraft (noise; feel; performance; etc) that had indicated a potential prop strike.
Source: NASA Aviation Safety Reporting System (public domain). Reports are voluntary submissions and are not verified by NASA.