Beechcraft A23A N7904L

Summary

On 12 July 1992 at about 16:00 local time, a Beechcraft A23A registered N7904L, operated by Evert O. Wilkerson, was involved in an accident near Chico, California, United States. 3 people were on board and nobody was injured. The aircraft was substantially damaged. The NTSB has published a probable cause for this accident; it is quoted in full below.

Date

12 July 1992 at 16:00

Classification

Accident

Location

Chico, California, United States

Coordinates

39.7402, -121.8298

Aircraft

Beechcraft A23A

Registration

N7904L

Category

Airplane

Engines

1

Operator

Evert O. Wilkerson

Operating rule

Part 91: General Aviation

Purpose of flight

Personal

Phase of flight

Not recorded

Route

Vacaville → Unknown

Aircraft damage

Substantial

Weather

IMC

Light

Day

NTSB number

LAX92LA322

Nobody was injured.

1) THE PILOT'S INADVERTENT ENTRY INTO INSTRUMENT METEOROLOGICAL CONDITIONS, 2) HIS FAILURE TO MAINTAIN CONTROL OF THE AIRCRAFT DUE TO SPATIAL DISORIENTATION, 3) THE INADVERTENT ENTRY INTO A SPIRAL DIVE AT AN EXCESSIVE AIRSPEED, AND, 4) THE PILOT'S IMPROPER USE OF THE FLIGHT CONTROLS WHICH IMPOSED EXCESSIVE LOADS ON THE AIRFRAME DURING THE ATTEMPTED RECOVERY FROM THE SPIRAL DIVE.

Quoted verbatim from the NTSB record. This site does not paraphrase or interpret it.

Read the full NTSB narrative

THE PILOT SAID HE WAS FLYING SOME FAMILY MEMBERS ON A TOUR OF THE SIERRA NEVADA MOUNTAIN RANGE FOOT HILLS WHEN THE FLIGHT ENCOUNTERED SOME RAPIDLY BUILDING CUMULUS CLOUDS WHILE CRUISING AT AN ALTITUDE OF ABOUT 11,500 FEET MSL. THE PILOT SAID HE WAS NAVIGATING AROUND THE BUILD UPS ATTEMPTING TO MAINTAIN VFR CONDITIONS WHEN THE CLOUDS SURROUNDED THE AIRCRAFT. THE FLIGHT INADVERTENTLY ENTERED ONE OF THE LARGE CLOUDS AND THE PILOT SAID THE AIRCRAFT ENDED UP IN A HIGH SPEED SPIRAL DIVE AT AN AIRSPEED IN EXCESS OF ABOUT 190 KNOTS. THE PILOT FURTHER STATED THAT HE, WITH THE HELP OF HIS SON, 'STARTED PULLING BACK ON THE WHEEL' AND RECOVERED CONTROL OF THE AIRCRAFT. THE FLIGHT THEN RETURNED TO ITS HOME BASE AND LANDED. EXAMINATION OF THE AIRCRAFT BY FAA INSPECTORS REVEALED THAT BOTH WINGS HAD MAJOR BUCKLES AT THE PRODUCTION JOINTS BETWEEN THE INBOARD AND OUTBOARD WING PANELS, WITH THE OUTBOARD PANELS EXHIBITING AN UPWARD PERMANENT SET. IN ADDITION, THE FUSELAGE IMMEDIATELY AFT OF THE FIREWALL AND FORWARD OF THE EMPENNAGE EXHIBITED AREAS OF SKIN BUCKLING.

Quoted verbatim from the NTSB record.