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An RV7A's right brake failed as it was taxied for takeoff because brake wear allowed the brake piston to become dislodged from the caliper draining all fluid to the brake.
| Attributes | |
| ACN | 929730 |
| Time | |
| Date | 201101 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | RV-7 |
| Operating Under FAR Part | Part 91 |
| Flight Phase | Taxi |
| Flight Plan | VFR |
| Component | |
| Aircraft Component | Normal Brake System |
| Person 1 | |
| Function | Single Pilot |
| Qualification | Flight Crew Private |
| Experience | Flight Crew Last 90 Days 30 Flight Crew Total 500 Flight Crew Type 500 |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical Inflight Event / Encounter Loss Of Aircraft Control |
Narrative:
I had been cleared by ground control to taxi to runway 26R via a taxiway from transient parking and fueling area. Taxi began normally. Nearing the end of taxiway; a left braking control was used to begin the left turn to hold short line at runway 26R. As out brake control was put in to straighten the aircraft; the brake pedal went to the floor with no braking action. Because left turn was already initiated; the aircraft continued in a left direction. The aircraft slowed somewhat and ran off taxiway with the left wheel pant/fairing hitting a taxiway light. The aircraft stopped as the wheel(s) went into the dirt. Investigation showed that the right side wheel brake piston had dislodged from caliper. A combination of worn rotors and worn brake pads allowed the piston to move beyond the sealing 'O' ring - all brake fluid in the right side was lost. Brake pads were last replaced almost a year ago and rotors met reuse guidelines. Approximately 80 hours had been put on new brake pads. To prevent recurrence advise that inspections be carried out more often. New rotors; pads and piston seal were installed as corrective action.
Original NASA ASRS Text
Title: An RV7A's right brake failed as it was taxied for takeoff because brake wear allowed the brake piston to become dislodged from the caliper draining all fluid to the brake.
Narrative: I had been cleared by Ground Control to taxi to Runway 26R via A taxiway from transient parking and fueling area. Taxi began normally. Nearing the end of taxiway; a left braking control was used to begin the left turn to hold short line at Runway 26R. As out brake control was put in to straighten the aircraft; the brake pedal went to the floor with no braking action. Because left turn was already initiated; the aircraft continued in a left direction. The aircraft slowed somewhat and ran off taxiway with the left wheel pant/fairing hitting a taxiway light. The aircraft stopped as the wheel(s) went into the dirt. Investigation showed that the right side wheel brake piston had dislodged from caliper. A combination of worn rotors and worn brake pads allowed the piston to move beyond the sealing 'O' ring - all brake fluid in the right side was lost. Brake pads were last replaced almost a year ago and rotors met reuse guidelines. Approximately 80 hours had been put on new brake pads. To prevent recurrence advise that inspections be carried out more often. New rotors; pads and piston seal were installed as corrective action.
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.