# Accident 20100419055569A: Beech B35, Burbank, CA, April 19, 2010

- Type: FAA accident report (Accident/Incident Data System), as reported
- Date: April 19, 2010, 14:15 local time
- Place: Burbank, CA
- Damage: Substantial damage
- Phase of flight: Descent
- Operating rules: General operating rules (Part 91)
- Location: 34.2006° N, 118.3586° W: From the FAA
- Nearby events: https://openairdocs.org/map.md?lat=34.2006&lon=-118.3586&mi=10
- Aircraft: N5032C, registered now (https://openairdocs.org/aircraft/N5032C) (OpenAirDocs)
- Registry model: Beech B35 (registry code 1151506, https://openairdocs.org/model/beech-b35) (OpenAirDocs)
- Registry engine: Continental E225 series (registry code 17015, https://openairdocs.org/engine/continental-e225-series) (OpenAirDocs)
- Reported make and model: BEECH B35
- Reported engine: CONT MOTOR E225 SERIES
- People aboard: 1
- Fatal injuries: 0
- Other injuries: 0
- Pilot certificates: Private pilot
- Pilot flight hours: 696 total, 108 in this make and model, 24 in the last 90 days
- NTSB investigation: [NTSB WPR10CA226](https://openairdocs.org/ntsb/WPR10CA226) (OpenAirDocs)
- FAA source: FAA Aviation Safety Information Portal (https://asip.faa.gov/)
- Page: https://openairdocs.org/incident/20100419055569A

## Narrative

As the FAA filed it, in capitals; the FAA replaces private details with ^PRIVACY DATA OMITTED^.

NTSB DID NOT NOTIFY FAA OF ACCIDENT. FAA UNAWARE OF ACCIDENT UNTIL 2/9/2011.ACCORDING TO NTSB REPORT, "THE PILOT REPORTED THAT, DURING DESCENT AND AT ABOUT 5,000 FEET, THE AIRPLANE WAS FLYING AT 155-160 MPH WHEN IT HIT SLIGHT TURBULENCE WHILE IN A 15 DEGREE LEFT TURN AND THE TAIL STARTED TO FLUTTER. THE PILOT QUICKLY REDUCED POWER AND RAISED THE NOSE IN ACCORDANCE WITH THE AIRPLANE'S PILOT INFORMATION MANUAL. THIS STOPPED THE VIBRATION, WHICH LASTED A TOTAL OF ABOUT 3 TO 5 SECONDS. THE REST OF THE APPROACH AND LANDING AT THE AIRPORT WAS UNEVENTFUL. DURING THE POST-FLIGHT INSPECTION, THE PILOT NOTICED WRINKLES IN THE RUDDERVATOR. A MECHANIC DETERMINED THAT THE LEFT RUDDERVATOR HAD A CRACKED FRONT SPAR AND THAT THE LEFT STABILIZER HAD WRINKLED TOP SKIN AND A CRACKED REAR SPAR, WHICH WAS BENT UP FIVE INCHES. EXAMINATION OF THE RUDDERVATORS DISCLOSED THAT THEY WERE WITHIN THE BALANCE REQUIREMENTS OF THE BEECHCRAFT MAINTENANCE MANUAL. THE PILOT STATED THAT HE WAS BETWEEN 155 AND 160 MPH AT THE TIME OF THE TURBULENCE ENCOUNTER. THE MAXIMUM STRUCTURAL CRUISING AIRSPEED FOR THIS MODEL VARIANT OF THE BEECH 35 SERIES (VNO OR VC, AND THE BEGINNING OF THE YELLOW CAUTION ARC) IS 161 MPH, AND THE MANEUVERING AIRSPEED (VA) IS 131 MPH. BY DEFINITION, MAXIMUM MANEUVERING SPEED (VA) IS THAT SPEED AT WHICH FULL AND ABRUPT CONTROL SURFACE DEFLECTION OR ANY TURBULENCE ENCOUNTER WILL RESULT IN AN AERODYNAMIC STALL BEFORE THE STRUCTURAL LIMIT LOAD WILL BE EXCEEDED AND DAMAGE WILL OCCUR. ABOVE VA IT IS POSSIBLE TO INCUR STRUCTURAL DAMAGE WITH MANEUVERING INPUTS AND/OR SIGNIFICANT TURBULENCE ENCOUNTERS. THE PILOT WAS FLYING ABOVE VA BUT WITHIN THE GREEN AIRSPEED ARC WHEN THE AIRPLANE ENCOUNTERED THE TURBULENCE; HOWEVER, HE WAS NOT FLYING IN THE YELLOW ARC ABOVE VC/VNO AND HAD NO REASON TO BELIEVE THAT THE AIRPLANE WOULD ENCOUNTER TURBULENCE."

## The NTSB's investigation of this event (1)

From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

- [NTSB WPR10CA226](https://openairdocs.org/ntsb/WPR10CA226), Apr 19, 2010: Beech B35 (N5032C), Burbank, CA, substantial damage. Probable cause: The airplane's encounter with turbulence while at an airspeed above maneuvering airspeed, which exceeded the limit load of the stabilizers and ruddervators.

## Other reports on N5032C (2)

Matched to the same aircraft by N-number and date.

- [Incident 19880629024239I](https://openairdocs.org/incident/19880629024239I), Jun 29, 1988: Beech B35 (N5032C), Auburn, WA, Minor damage. Collapsed the landing gear during the landing rollout. No cause given.
- [Incident 19860625058059I](https://openairdocs.org/incident/19860625058059I), Jun 25, 1986: Beech B35 (N5032C), Vancouver, WA, Minor damage. Lost electrical power on approach, gear appeared to be down. Gear collapsed on touchdown.

From the FAA Accident/Incident Data System. Reports are matched to registry aircraft by N-number and event date, checked against the reported make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model. For accidents, the NTSB's own investigation is the fuller record.

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