- Date
- July 12, 1992, 09:00 local (16:00 UTC)
- Place
- Chico, CA
- Injuries
- 3 uninjured
- Damage
- Substantial damage
- Phase of flight
- Enroute
- Aircraft
- N7904LBeech A23A
- Weather
- Instrument (IMC) · Day
- Status
- Completed · report September 14, 1993
- Report
- Approved by Office Director
- Case key
- 27708
From the NTSB’s public API. By law, NTSB reports can’t be used as evidence in lawsuits over the accident.
On this page
Probable cause
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.
Sequence of events
NTSB’s coding before 2008: each occurrence and phase of flight, and the causes and factors under it. The codes are defined in NTSB’s coding manual.
Analysis
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.
Aircraft
- Registration
- N7904L
- Reported as
- Beech A23A
- Category
- Airplane
- Serial number
- M979
- Engine
- Continental IO-346A, 165 horsepower, reciprocating
- Damage
- Substantial damage
- Flight
- Personal · Part 91
- Operator
- Evert O. Wilkerson
- Registered owner
- Evert O. Wilkerson
- Airworthiness certificate
- Standard, Normal
- Last inspection
- Annual · January 2, 2000
- Departed
- O45 · Vacaville, CA
- Destination
- O45
- Flight plan
- VFR
Matched to the registry by N-number and the event date; the registry’s history has gaps, so older matches can be wrong. Compare the reported make and model.
Flight crew
As NTSB recorded them. NTSB leaves out names.
- Role
- Pilot
- Age
- 37
- Certificate
- Private
- Airplane ratings
- Single-engine land
- Medical
- Class 3, Valid Medical--no waivers/lim.
- Seat
- Left
- Flight hours
- 95 total · 38 in this make and model · 51 as pilot in command · 30 in the last 90 days · 7 in the last 30 days · 2 in the last 24 hours
Weather
- Conditions
- Instrument (IMC) · Day
- Lowest ceiling
- 6,000 ft broken