Narrative:

After establishing a positive rate of climb gear up was selected. We were transferred to departure when the hydraulic system failed and we lost all hydraulic pressure. The gear had not fully retracted at this time. We canceled our IFR clearance. While going through the hydraulic system checklist we advised tower we wanted to do a flyby of the tower to determine gear status. We cycled the pump; hand pumped and used the emergency gear release and followed the navion recommended procedures for hydraulic failure. We had 3 green gear lights and one red in transit light and could not pump any pressure. This indicated one or more gear was not locked down or a gear light failure. My student then transferred pilot flying duties to me.we then flew past the tower on a high missed approach. Tower advised the gear appeared down. We went around the pattern and flew final at 70 KTS and landed power off; following the emergency checklist. Landed on the main gear and as the nose came down it went too low and I noted a prop strike by sound. I added power pulled back on the yoke and bounced the plane which locked the nose gear down. Then I went to idle. I tried to maintain the centerline using full left rudder but the aircraft veered to the right and exited the right side of the runway on rollout. The nose wheel separated. We hit a snow berm with the right wheel and spun approximately 180 and about 150 ft from the runway. We performed an emergency shutdown of aircraft systems and exited the aircraft.upon looking back at the runway I could see two skid marks from the tires indicating that my student had braced for impact on the brake pedals. On downwind and high final their feet were on the floor. I was in the right seat and did not have brakes. I believe the unintentional braking put excessive strain on the gear causing damage to the right gear. Also the braking destabilized the wheels gyroscopic action and caused the unintentional exiting on the right side of the runway. My intention was to rollout on the 6;000 ft runway without brakes. Touchdown had been achieved in the first 500 ft of the runway and rollout and stopping was not a concern because of the runway length.

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Original NASA ASRS Text

Title: Unable to assure the gear was down and locked following a hydraulic failure during gear retraction; the instructor assume pilot flying duties from his student and landed the aircraft from the right seat; which has no brakes. The aircraft brakes were locked causing loss of directional control and the aircraft exited the runway. The instructor believes the student was bracing their feet on the brake pedals throughout the event.

Narrative: After establishing a positive rate of climb gear up was selected. We were transferred to Departure when the hydraulic system failed and we lost all hydraulic pressure. The gear had not fully retracted at this time. We canceled our IFR clearance. While going through the hydraulic system checklist we advised Tower we wanted to do a flyby of the Tower to determine gear status. We cycled the pump; hand pumped and used the emergency gear release and followed the Navion recommended procedures for hydraulic failure. We had 3 green gear lights and one red in transit light and could not pump any pressure. This indicated one or more gear was not locked down or a gear light failure. My student then transferred pilot flying duties to me.We then flew past the Tower on a high missed approach. Tower advised the gear appeared down. We went around the pattern and flew final at 70 KTS and landed power off; following the emergency checklist. Landed on the main gear and as the nose came down it went too low and I noted a prop strike by sound. I added power pulled back on the yoke and bounced the plane which locked the nose gear down. Then I went to idle. I tried to maintain the centerline using full left rudder but the aircraft veered to the right and exited the right side of the runway on rollout. The nose wheel separated. We hit a snow berm with the right wheel and spun approximately 180 and about 150 FT from the runway. We performed an emergency shutdown of aircraft systems and exited the aircraft.Upon looking back at the runway I could see two skid marks from the tires indicating that my student had braced for impact on the brake pedals. On downwind and high final their feet were on the floor. I was in the right seat and did not have brakes. I believe the unintentional braking put excessive strain on the gear causing damage to the right gear. Also the braking destabilized the wheels gyroscopic action and caused the unintentional exiting on the right side of the runway. My intention was to rollout on the 6;000 FT runway without brakes. Touchdown had been achieved in the first 500 FT of the runway and rollout and stopping was not a concern because of the runway length.

Data retrieved from NASA's ASRS site as of April 2012 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.