Pilot of small aircraft unable to throttle back during taxi. Brake overheats and catches fire.

Attributes
ACN	243070
Time
Date	199306
Day	Thu
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : hya
State Reference	MA
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	general aviation : instructional
Make Model Name	Small Aircraft, Low Wing, 1 Eng, Fixed Gear
Flight Phase	ground other : taxi
Flight Plan	VFR
Person 1
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : commercial pilot : cfi pilot : instrument
Experience	flight time last 90 days : 80 flight time total : 540 flight time type : 1
ASRS Report	243070
Person 2
Affiliation	Other
Function	observation : passenger
Qualification	other other : other
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	other flight crewa
Resolutory Action	flight crew : declared emergency other
Consequence	other
Supplementary
Primary Problem	Aircraft

Narrative:

At approximately XA00 pm I started preflting the aircraft to make sure it was airworthy. We loaded the passenger and proceeded with the starting checklist. We started taxiing from the hyannis airport operations building at XA15 pm, at which time the tower was closed. As I was taxiing down to the runup area at the end of runway 24, I noticed that the power seemed to be increasing but that the throttle was still as far back as it would go. I tried moving the throttle forward and backward and adjusting the friction lock, but nothing worked. I released the pressure on the brakes and the airplane picked up speed rapidly so I went back on the brakes and the airplane slowed down again. Once again I tried releasing the pressure on the brakes and the airplane rapidly picked up speed. At this point I lost the right brake and started turning to the left, so I put on the parking brake, shut down the engine and opened the door and climbed out. I looked under the right wing and noticed the wheel on fire and rapidly got everyone out of the airplane and we started running away from the airplane towards the fire department back at operations. Callback conversation with reporter revealed the following information: reporter states the speed fairing and undersurface of the wing were damaged. All was repairable and aircraft is back in service again. Maintenance determined the throttle linkage had broken.

Original NASA ASRS Text

Title: PLT OF SMA UNABLE TO THROTTLE BACK DURING TAXI. BRAKE OVERHEATS AND CATCHES FIRE.

Narrative: AT APPROX XA00 PM I STARTED PREFLTING THE ACFT TO MAKE SURE IT WAS AIRWORTHY. WE LOADED THE PAX AND PROCEEDED WITH THE STARTING CHKLIST. WE STARTED TAXIING FROM THE HYANNIS ARPT OPS BUILDING AT XA15 PM, AT WHICH TIME THE TWR WAS CLOSED. AS I WAS TAXIING DOWN TO THE RUNUP AREA AT THE END OF RWY 24, I NOTICED THAT THE PWR SEEMED TO BE INCREASING BUT THAT THE THROTTLE WAS STILL AS FAR BACK AS IT WOULD GO. I TRIED MOVING THE THROTTLE FORWARD AND BACKWARD AND ADJUSTING THE FRICTION LOCK, BUT NOTHING WORKED. I RELEASED THE PRESSURE ON THE BRAKES AND THE AIRPLANE PICKED UP SPD RAPIDLY SO I WENT BACK ON THE BRAKES AND THE AIRPLANE SLOWED DOWN AGAIN. ONCE AGAIN I TRIED RELEASING THE PRESSURE ON THE BRAKES AND THE AIRPLANE RAPIDLY PICKED UP SPD. AT THIS POINT I LOST THE R BRAKE AND STARTED TURNING TO THE L, SO I PUT ON THE PARKING BRAKE, SHUT DOWN THE ENG AND OPENED THE DOOR AND CLBED OUT. I LOOKED UNDER THE R WING AND NOTICED THE WHEEL ON FIRE AND RAPIDLY GOT EVERYONE OUT OF THE AIRPLANE AND WE STARTED RUNNING AWAY FROM THE AIRPLANE TOWARDS THE FIRE DEPT BACK AT OPS. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR STATES THE SPD FAIRING AND UNDERSURFACE OF THE WING WERE DAMAGED. ALL WAS REPAIRABLE AND ACFT IS BACK IN SVC AGAIN. MAINT DETERMINED THE THROTTLE LINKAGE HAD BROKEN.

Data retrieved from NASA's ASRS site as of July 2007 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.