Cessna 172 N4899F

Summary

On 7 March 1982 at about 04:40 local time, a Cessna 172 registered N4899F, operated by John F. Byrns, was involved in an accident near Boulder, Colorado, United States. 2 people were on board and 2 were seriously injured. The aircraft was destroyed. No probable cause statement is available for this record.

Date

7 March 1982 at 04:40

Classification

Accident

Location

Boulder, Colorado, United States

Coordinates

Not recorded

Aircraft

Cessna 172

Registration

N4899F

Category

Airplane

Engines

1

Operator

John F. Byrns

Operating rule

Part 91: General Aviation

Purpose of flight

Personal

Phase of flight

Not recorded

Route

Broomfield → Unknown

Aircraft damage

Destroyed

Weather

VMC

Light

Night/Dark

NTSB number

DEN82FTE17

2 people were seriously injured.

The NTSB has not published a probable cause for this record. No probable cause statement is present in the source data.

Nothing about the cause is stated here that is not in the source record.

Read the full NTSB narrative

THE ENGINE LOST POWER WHILE THE AIRCRAFT WAS CRUISING AT 7500 FT MSL AT NIGHT. DURING A FORCED LANDING, THE AIRCRAFT TOUCHED DOWN ON STEEP, ROCKY SOIL. THE AIRCRAFT BOUNCED AND THEN NOSED OVER AFTER A SECOND TOUCHDOWN. DURING AN INTERVIEW ABOUT TWO HOURS AFTER THE ACCIDENT, THE PILOT REPORTED AN INDICATION OF ABOUT 1800 RPM WHEN THE ENGINE LOST POWER. DURING THAT INTERVIEW, HE INDICATED THAT HE MAY NOT HAVE USED CARBURETOR HEAT WHILE ATTEMPTING TO RESTART THE ENGINE. LATER IN A WRITTEN STATEMENT HE REPORTED THAT HE "PUSHED IN CARB HEAT" WHILE ATTEMPTING TO RESTART THE ENGINE. THE TEMPERATURE WAS 27 DEGREES FAHRENHEIT, BUT THE DEW POINT WAS NOT DETERMINED. WHEN THE FUEL SYSTEM WAS CHECKED, NO CONTAMINATION WAS FOUND. HOWEVER, DURING IMPACT, THE FIREWALL SUMP HAD RUPTURED AND THE CARBURETOR WAS BROKEN AWAY FROM THE ENGINE. AN ENGINE TEARDOWN REVEALED NO PREIMPACT MALFUNCTION OR FAILURE.

Quoted verbatim from the NTSB record.