While taxiing in after landing an instructor pilot and his multi-engine student lost control of thei...

Attributes
ACN	961486
Time
Date	201107
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	PA-34-200 Seneca I
Operating Under FAR Part	Part 91
Flight Phase	Taxi
Route In Use	None
Flight Plan	None
Component
Aircraft Component	Normal Brake System
Person 1
Function	Instructor Pilot Flying
Qualification	Flight Crew Commercial Flight Crew Flight Instructor Flight Crew Instrument Flight Crew Multiengine
Experience	Flight Crew Last 90 Days 150 Flight Crew Total 1200 Flight Crew Type 30
Events
Anomaly	Aircraft Equipment Problem Critical Ground Event / Encounter Loss Of Aircraft Control Ground Event / Encounter Object Ground Excursion Runway

Narrative:

Upon landing on runway 9L; I exited the runway and brought the aircraft to a full stop to go through the after landing checklist. After receiving taxi instructions from ground control; my commercial multi engine student proceeded to taxi the aircraft. I noticed that he was making a turn in the opposite direction of the runway. I asked if everything was fine; and was advised yes. Upon correcting the aircraft in the correct direction as instructed to taxi; I noticed the aircraft starting to veer to the left of the taxiway. I asked my student again if he had control of the aircraft? He said yes; and I noticed the aircraft still veering to the left of the taxiway; and I assumed control of the aircraft. When I took control of the aircraft; I pressed the copilot brakes; and immediately noticed that the left landing gear brakes were functioning; but the right side were not. The aircraft was veering to the left; because when my student pressed the brakes; the left brakes worked but the right did not. When I pressed the brakes; the aircraft veered more to the left because of right brake failure. I immediately pulled the emergency brakes; and there was no pressure. The throttle was in idle as I took control of the aircraft; so I placed the mixtures to cut off. The aircraft was still in motion; and went off of the runway; and struck a taxiway sign.

Original NASA ASRS Text

Title: While taxiing in after landing an instructor pilot and his multi-engine student lost control of their PA34 when the brakes failed; running off the taxiway and striking a sign.

Narrative: Upon landing on Runway 9L; I exited the runway and brought the aircraft to a full stop to go through the after landing checklist. After receiving taxi instructions from Ground Control; my commercial multi engine student proceeded to taxi the aircraft. I noticed that he was making a turn in the opposite direction of the runway. I asked if everything was fine; and was advised yes. Upon correcting the aircraft in the correct direction as instructed to taxi; I noticed the aircraft starting to veer to the left of the taxiway. I asked my student again if he had control of the aircraft? He said yes; and I noticed the aircraft still veering to the left of the taxiway; and I assumed control of the aircraft. When I took control of the aircraft; I pressed the copilot brakes; and immediately noticed that the left landing gear brakes were functioning; but the right side were not. The aircraft was veering to the left; because when my student pressed the brakes; the left brakes worked but the right did not. When I pressed the brakes; the aircraft veered more to the left because of right brake failure. I immediately pulled the emergency brakes; and there was no pressure. The throttle was in idle as I took control of the aircraft; so I placed the mixtures to cut off. The aircraft was still in motion; and went off of the runway; and struck a taxiway sign.

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.