GENERAL INFORMATION FOR NTSB REPORT: ANC00LA054
Data Source NTSB AVIATION ACCIDENT/INCIDENT DATABASE
NTSB Report Nbr ANC00LA054
Event Id 20001212X20933
Local Date 05/07/2000
Local Time 1840
State AK
Event Type ACCIDENT
Injury Severity NONE
Record Status
Mid Air Collision NO
Event Location OFF AIRPORT/AIRSTRIP

WEATHER INFORMATION
Weather Briefing Complete UNKNOWN
Basic Weather Conditions VISUAL METEOROLOGICAL COND
Light Condition DAY
Cloud Condition CLEAR
Cloud Height above Ground Level (ft) 0
Ceiling Height above Ground Level (ft) 0
Cloud Type NONE
Visibility RVR (ft) 0
Visibility RVV (sm) 0
Visibility (sm) 50
Wind Direction (deg) 191
Wind Condition Flag U
Wind Speed (knots) 11
Wind Condition Indicated Unknown

AIRCRAFT INFORMATION
Aircraft 1
Type of Operation PART 91: GENERAL AVIATION
Registration Number N992EZ
Aircraft Make CESSNA
Aircraft Model 170
Aircraft Series B
Aircraft Damage SUBSTANTIAL
Aircraft Fire NONE
Aircraft Explosion NONE
Aircraft Type AIRPLANE
Aircraft Homebuilt UNKNOWN
Phase of Flight UNDEFINED
Aircraft Use PERSONAL
Flight Plan Filed NONE
Operator Name
Operator Doing Business As
Owner Name DOUGLAS M. FULTON
Number of Seats 4
Number of Engines 1
ELT Installed YES
ELT Operated YES
Departure Airport Id VDZ
Departure City VALDEZ
Departure State ALASKA
Last Departure Point NO
Destination Airport Id D66
Destination City DELTA JUNCTION
Destination State ALASKA
Runway Id 0
Air Carrier Operating Certificates NO
Air Carrier Other Operating Certificates UNKNOWN
Rotocraft/Agriculture Operating Certificate UNKNOWN
Cert Max Gross Wgt 2200

ENGINE INFORMATION

Aircraft 1 - Engine : #1
Engine Manufactuer Lycoming
Engine Model O-360-A1A
Engine Horsepower 180
Engine Thrust HP
Carb/Injection CARBURETOR

INJURY INFORMATION
Injury Summary for Aircraft 1
Fatal Serious Minor None
Crew 0 0 0 0
Pass 0 0 0 0
Total 0 0 0 1
Sequence of Events for Aircraft 1
Occurrence #1
LOSS OF ENGINE POWER
Phase of Operation: CRUISE

Events Sequence for Occurrence #1 of Aircraft 1
Event Seq # Event Group Code Subject Modifier Personnel Cause/Factor
1 2 REASON FOR OCCURRENCE UNDETERMINED NO MODIFIER SPECIFIED NO PERSON SPECIFIED

Occurrence #2
FORCED LANDING
Phase of Operation: EMERGENCY DESCENT/LANDING

Events Sequence for Occurrence #2 of Aircraft 1
Event Seq # Event Group Code Subject Modifier Personnel Cause/Factor
2 1 TERRAIN CONDITION NONE SUITABLE

Occurrence #3
IN FLIGHT COLLISION WITH OBJECT
Phase of Operation: EMERGENCY DESCENT/LANDING

Events Sequence for Occurrence #3 of Aircraft 1
Event Seq # Event Group Code Subject Modifier Personnel Cause/Factor
3 1 OBJECT TREE(S)




AIRCRAFT 1 PRELIMINARY REPORT


On May 7, 2000, about 1840 Alaska daylight time, a wheel equipped Cessna 170B airplane, N992EZ, sustained substantial damage after colliding with tree-covered terrain, about 6 miles north of Delta Junction, Alaska, at latitude 63 degrees, 59 minutes north, and longitude 145 degrees, 30 minutes west. The airplane was being operated as a visual flight rules (VFR) personal flight under Title 14, CFR Part 91, when the accident occurred. The solo certificated private pilot was not injured. Visual meteorological conditions prevailed, and no flight plan was filed. The flight originated at the Valdez Airport, Valdez, Alaska, about 1645. During a telephone conversation with the National Transportation Safety Board investigator-in-charge on May 8, the pilot reported that while in cruise flight, about 600 feet above the ground, the engine RPM suddenly dropped to idle. He said that emergency engine procedures did not restore full engine power, and he selected a forced landing area that contained trees. The airplane collided with the trees, and sustained substantial damage to the wings, fuselage, and empennage. A Federal Aviation Administration (FAA) airworthiness inspector from the Fairbanks Flight Standards District Office (FSDO), traveled to the accident scene on May 8. He reported that the airplane came to rest on the lower portion of the engine cowling. He said that after the airplane was lifted off of the engine cowling, he was able to gain access to the outlet port of the exhaust muffler. He said that when he inserted a probe into the muffler, he noted "there was something loose within the muffler." The muffler assembly was subsequently removed from the airplane, and shipped to the NTSB investigator-in-charge. On May 15, the muffler assembly was cut open in the presence of the NTSB investigator-in-charge. An internal inspection revealed extensive thermal destruction of the internal baffling material. The baffling material that remained in the muffler measured about 4 inches by 3 inches. By placing the remaining material in various position over the exhaust port, the NTSB investigator was unable to position it in such a way that a blockage would occur.

AIRCRAFT 1 FINAL REPORT


The solo private pilot reported that while in cruise flight, about 600 feet above the ground, the engine RPM suddenly dropped to idle. Emergency engine procedures did not restore full engine power, and he selected a forced landing area that contained trees. The airplane sustained damage to the wings, fuselage, and empennage. An FAA airworthiness inspector who traveled to the accident scene reported that when he inserted a probe into the muffler, he noted 'there was something loose within the muffler.' The muffler assembly was subsequently removed from the airplane, and shipped to the NTSB investigator-in-charge. On May 15, the muffler assembly was cut open in the presence of the NTSB investigator-in-charge. An internal inspection revealed extensive thermal destruction of the internal baffling material. The baffling material that remained in the muffler measured about 4 inches by 3 inches. By placing the remaining material in various position over the exhaust port, the NTSB investigator was unable to position it in such a way that a blockage would occur.

AIRCRAFT 1 CAUSE REPORT


A loss of engine power due to an undetermined reason. A factor in the accident was unsuitable terrain for a forced landing.


END REPORT