BE24 with brake failure taxies into parked aircraft at gai.

Attributes
ACN	415788
Time
Date	199809
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : gai
State Reference	MO
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	general aviation : instructional
Make Model Name	Sierra 24
Operating Under FAR Part	Part 91
Flight Phase	ground : preflight ground other : taxi
Flight Plan	None
Aircraft 2
Make Model Name	Skyhawk 172/Cutlass 172
Operating Under FAR Part	other : unknown
Flight Phase	ground : parked
Person 1
Affiliation	Other
Function	instruction : instructor oversight : pic
Qualification	pilot : instrument pilot : cfi pilot : commercial
Experience	flight time last 90 days : 100 flight time total : 3300 flight time type : 5
ASRS Report	415788
Person 2
Affiliation	Other
Function	instruction : trainee
Qualification	pilot : private
Experience	flight time total : 500
Events
Anomaly	aircraft equipment problem : critical conflict : ground critical other anomaly other
Independent Detector	other flight crewa
Resolutory Action	none taken : unable
Consequence	other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	other

Narrative:

Before engine start-up, student tested brakes. He said they felt mushy. I tested the brakes. The right brake felt mushy, but did not travel all the way to the floor. It felt like we had brakes. After start-up the student tested brakes before taxiing. The brakes worked. The student added a little power to start the airplane moving, reduced power, and applied brakes. The brakes worked. The student added power and turned to the left to begin taxiing. The airplane moved forward about 20 ft and then began turning to the left. He stated that he had no right brake and the right rudder was sticking. He reduced power to idle. I reduced the mixture to idle cutoff and applied brakes. There was no response from the right brake. The propeller struck a parked C172 on the C172's left side cowling. We turned off the master, magnetos, and fuel selector. We then vacated the aircraft. I checked the brakes and saw that the outboard brake pad on the right brake caliper was missing. The student, a 500 hour private pilot, said he had checked the brakes and the brake pads during the preflight inspection and thought they looked ok. I did not verify that the brakes were present before engine start-up.

Original NASA ASRS Text

Title: BE24 WITH BRAKE FAILURE TAXIES INTO PARKED ACFT AT GAI.

Narrative: BEFORE ENG START-UP, STUDENT TESTED BRAKES. HE SAID THEY FELT MUSHY. I TESTED THE BRAKES. THE R BRAKE FELT MUSHY, BUT DID NOT TRAVEL ALL THE WAY TO THE FLOOR. IT FELT LIKE WE HAD BRAKES. AFTER START-UP THE STUDENT TESTED BRAKES BEFORE TAXIING. THE BRAKES WORKED. THE STUDENT ADDED A LITTLE PWR TO START THE AIRPLANE MOVING, REDUCED PWR, AND APPLIED BRAKES. THE BRAKES WORKED. THE STUDENT ADDED PWR AND TURNED TO THE L TO BEGIN TAXIING. THE AIRPLANE MOVED FORWARD ABOUT 20 FT AND THEN BEGAN TURNING TO THE L. HE STATED THAT HE HAD NO R BRAKE AND THE R RUDDER WAS STICKING. HE REDUCED PWR TO IDLE. I REDUCED THE MIXTURE TO IDLE CUTOFF AND APPLIED BRAKES. THERE WAS NO RESPONSE FROM THE R BRAKE. THE PROP STRUCK A PARKED C172 ON THE C172'S L SIDE COWLING. WE TURNED OFF THE MASTER, MAGNETOS, AND FUEL SELECTOR. WE THEN VACATED THE ACFT. I CHKED THE BRAKES AND SAW THAT THE OUTBOARD BRAKE PAD ON THE R BRAKE CALIPER WAS MISSING. THE STUDENT, A 500 HR PVT PLT, SAID HE HAD CHKED THE BRAKES AND THE BRAKE PADS DURING THE PREFLT INSPECTION AND THOUGHT THEY LOOKED OK. I DID NOT VERIFY THAT THE BRAKES WERE PRESENT BEFORE ENG START-UP.

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.