Small aircraft pilot on photo mission has engine failure, off airport landing.

Attributes
ACN	334570
Time
Date	199604
Day	Fri
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : elp
State Reference	TX
Altitude	agl bound lower : 0 agl bound upper : 6000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : elp
Operator	general aviation : instructional
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 91
Flight Phase	cruise other
Flight Plan	None
Person 1
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : commercial pilot : instrument
Experience	flight time last 90 days : 35 flight time total : 540 flight time type : 33
ASRS Report	334570
Person 2
Affiliation	government : faa
Function	controller : approach
Qualification	controller : radar
Events
Anomaly	aircraft equipment problem : critical other spatial deviation
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : declared emergency other
Consequence	other
Supplementary
Primary Problem	Aircraft

Narrative:

Upon return of circling maneuvers (period photos) engine began to run rough and vibrate. Engine temperature, oil temperature, oil pressure displayed no indication of temperature increase or drop. All remained stable, within green indications. Manifold pressure dropped only 1/2 inch to 1 inch and fuel flow was proportional for the power set. An attempt to smoothen engine operation was not successful, problem worsened. Result was a loud bang sound from engine which resulted in propeller coming to a complete stop. A forced landing was made in residential street, gear down, all electrical and fuel secured. Normal landing in street and no injuries to passenger, people or ground or to pilot. Cause of engine failure was connecting and bolt failure (sheared) and exited engine case and cowling.

Original NASA ASRS Text

Title: SMA PLT ON PHOTO MISSION HAS ENG FAILURE, OFF ARPT LNDG.

Narrative: UPON RETURN OF CIRCLING MANEUVERS (PERIOD PHOTOS) ENG BEGAN TO RUN ROUGH AND VIBRATE. ENG TEMP, OIL TEMP, OIL PRESSURE DISPLAYED NO INDICATION OF TEMP INCREASE OR DROP. ALL REMAINED STABLE, WITHIN GREEN INDICATIONS. MANIFOLD PRESSURE DROPPED ONLY 1/2 INCH TO 1 INCH AND FUEL FLOW WAS PROPORTIONAL FOR THE PWR SET. AN ATTEMPT TO SMOOTHEN ENG OP WAS NOT SUCCESSFUL, PROB WORSENED. RESULT WAS A LOUD BANG SOUND FROM ENG WHICH RESULTED IN PROP COMING TO A COMPLETE STOP. A FORCED LNDG WAS MADE IN RESIDENTIAL STREET, GEAR DOWN, ALL ELECTRICAL AND FUEL SECURED. NORMAL LNDG IN STREET AND NO INJURIES TO PAX, PEOPLE OR GND OR TO PLT. CAUSE OF ENG FAILURE WAS CONNECTING AND BOLT FAILURE (SHEARED) AND EXITED ENG CASE AND COWLING.

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.