A beech A36 bonanza on test flight at 1000 ft experienced loud noise and severe vibration. Declared ...

Attributes
ACN	617046
Time
Date	200405
Day	Mon
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	msl single value : 1000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	general aviation : personal
Make Model Name	Bonanza 36
Operating Under FAR Part	Part 91
Flight Plan	None
Aircraft 2
Flight Phase	climbout : initial
Route In Use	approach : traffic pattern departure : vfr
Person 1
Affiliation	other
Function	flight crew : single pilot
Qualification	pilot : multi engine pilot : atp pilot : commercial pilot : flight engineer pilot : instrument
Experience	flight time last 90 days : 60 flight time total : 20000 flight time type : 400
ASRS Report	617046
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	other flight crewa
Resolutory Action	flight crew : landed in emergency condition flight crew : declared emergency
Consequence	faa : reviewed incident with flight crew faa : investigated other other other Other
Supplementary
Problem Areas	Maintenance Human Performance Aircraft
Primary Problem	Aircraft

Narrative:

Purpose of flight was flight test after annual inspection. Plan was to fly a couple times around local airport pattern and land. On first takeoff and climbing to 1000 ft on crosswind leg turning to downwind, loud noise and vibration from engine. Continued turn towards runway, made mayday radio call, and landed without further incident. Initial inspection revealed 1 blade of 3 blade propeller had rotated 180 degrees (past propeller stop). Callback conversation with reporter revealed the following information: the reporter stated the engine was still operating, but had no thrust so was shut down. The reporter said inspection revealed 1 blade was almost in the feather position. The reporter stated when disassembled it was discovered a control pin in the defective blade had sheared allowing the blade to move almost 180 degrees. The reporter said the engine incurred major damage and was torn down. All 6 pistons had struck the connecting rod bearing caps and all steel parts were removed for testing. The reporter stated all gyroscope instruments were found damaged and were removed for repair. The reporter said the propeller manufacturer (mccauley) was advised of the control pin failure and stated this is a rare failure. The reporter stated the NTSB and the FAA were present when the propeller was disassembled and took the sheared control pin for testing.

Original NASA ASRS Text

Title: A BEECH A36 BONANZA ON TEST FLT AT 1000 FT EXPERIENCED LOUD NOISE AND SEVERE VIBRATION. DECLARED AN EMER AND LANDED. CAUSED BY FAILED PROP BLADE LOCK.

Narrative: PURPOSE OF FLT WAS FLT TEST AFTER ANNUAL INSPECTION. PLAN WAS TO FLY A COUPLE TIMES AROUND LCL ARPT PATTERN AND LAND. ON FIRST TKOF AND CLBING TO 1000 FT ON XWIND LEG TURNING TO DOWNWIND, LOUD NOISE AND VIBRATION FROM ENG. CONTINUED TURN TOWARDS RWY, MADE MAYDAY RADIO CALL, AND LANDED WITHOUT FURTHER INCIDENT. INITIAL INSPECTION REVEALED 1 BLADE OF 3 BLADE PROP HAD ROTATED 180 DEGS (PAST PROP STOP). CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE ENG WAS STILL OPERATING, BUT HAD NO THRUST SO WAS SHUT DOWN. THE RPTR SAID INSPECTION REVEALED 1 BLADE WAS ALMOST IN THE FEATHER POS. THE RPTR STATED WHEN DISASSEMBLED IT WAS DISCOVERED A CTL PIN IN THE DEFECTIVE BLADE HAD SHEARED ALLOWING THE BLADE TO MOVE ALMOST 180 DEGS. THE RPTR SAID THE ENG INCURRED MAJOR DAMAGE AND WAS TORN DOWN. ALL 6 PISTONS HAD STRUCK THE CONNECTING ROD BEARING CAPS AND ALL STEEL PARTS WERE REMOVED FOR TESTING. THE RPTR STATED ALL GYROSCOPE INSTS WERE FOUND DAMAGED AND WERE REMOVED FOR REPAIR. THE RPTR SAID THE PROP MANUFACTURER (MCCAULEY) WAS ADVISED OF THE CTL PIN FAILURE AND STATED THIS IS A RARE FAILURE. THE RPTR STATED THE NTSB AND THE FAA WERE PRESENT WHEN THE PROP WAS DISASSEMBLED AND TOOK THE SHEARED CTL PIN FOR TESTING.

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.

A beech A36 bonanza on test flight at 1000 ft experienced loud noise and severe vibration. Declared an emergency and landed. Caused by failed propeller blade lock.