Declared emergency when faced with a runaway propeller on single engine aircraft.

Attributes
ACN	98742
Time
Date	198811
Day	Sat
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : sjc
State Reference	CA
Altitude	msl bound lower : 1100 msl bound upper : 1100
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : sjc
Operator	general aviation : personal
Make Model Name	Small Aircraft
Flight Phase	climbout : initial climbout : intermediate altitude
Flight Plan	VFR
Person 1
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : private
Experience	flight time last 90 days : 40 flight time total : 850 flight time type : 287
ASRS Report	98742
Person 2
Affiliation	government : faa
Function	controller : local
Qualification	controller : non radar
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	other flight crewa
Resolutory Action	flight crew : declared emergency other
Consequence	Other
Supplementary
Primary Problem	Aircraft

Narrative:

On the 45 degree departure from 30R I declared an emergency after takeoff from sjc. The emergency was started by the tachometer going into the red and manifold pressure falling. The altitude at that moment approximately 1100 MSL. I made an immediate right turn to downwind to 30R, called tower, told them my situation. They informed me of traffic in pattern (several reported) and asked if I wanted to declare an emergency. Because of traffic and short time to assess problem, I declared emergency. I landed without incident. P.south. Governor (propeller) failed, is now being repaired.

Original NASA ASRS Text

Title: DECLARED EMERGENCY WHEN FACED WITH A RUNAWAY PROPELLER ON SINGLE ENGINE ACFT.

Narrative: ON THE 45 DEG DEP FROM 30R I DECLARED AN EMER AFTER TKOF FROM SJC. THE EMER WAS STARTED BY THE TACHOMETER GOING INTO THE RED AND MANIFOLD PRESSURE FALLING. THE ALT AT THAT MOMENT APPROX 1100 MSL. I MADE AN IMMEDIATE RIGHT TURN TO DOWNWIND TO 30R, CALLED TWR, TOLD THEM MY SITUATION. THEY INFORMED ME OF TFC IN PATTERN (SEVERAL REPORTED) AND ASKED IF I WANTED TO DECLARE AN EMER. BECAUSE OF TFC AND SHORT TIME TO ASSESS PROBLEM, I DECLARED EMER. I LANDED WITHOUT INCIDENT. P.S. governor (PROP) FAILED, IS NOW BEING REPAIRED.

Data retrieved from NASA's ASRS site as of August 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.