LAX94LA029

NTSB accident investigation · Beech 76 · Livermore, CA · October 26, 1993

Accident · No injuriesLimited investigationFinal report
Date
October 26, 1993, 15:25 local (22:25 UTC)
Place
Livermore, CA
Injuries
3 uninjured
Damage
Substantial damage
Phase of flight
Landing
Aircraft
N6626XBeech 76
Weather
Visual (VMC) · Day
Status
Completed · report September 13, 1994
Report
Approved by Office Director
FAA report
19931026041199A
Case key
28582

From the NTSB’s public API. By law, NTSB reports can’t be used as evidence in lawsuits over the accident.

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Probable cause

the dual student's improper use of the throttle and the flight instructor's inadequate supervision of the flight.

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.

Hard landingLanding - flare/touchdown
Throttle/power control - improper use ofDual studentCause
Supervision - inadequatePilot in command(cfi)Cause

Analysis

The flight instructor reported that the student was performing touch and go pattern operations on runway 7L at the Livermore airport. The instructor said that the student flared about 8 to 10 feet above the runway and 'abruptly reduced the throttle.' The aircraft then made a very hard touchdown. The instructor stated that he took control of the aircraft during the bounce and successfully initiated a go-around. The pilot evaluated the aircraft systems for any possible damage, and, concluding there was none, continued the flight. After the aircraft returned to the Oakland airport for refueling, the pilot noted the damage to the left prop. Maintenance personnel discovered damage to the left main wing spar.

Factual narrative

On October 26, 1993, at 1525 Pacific daylight time, a Beech BE- 76, N6626X, sustained substantial structural damage to the left main wing spar as well as damage to both blades of the left propeller during a hard landing at Livermore, California. The aircraft was operated by Sierra Academy of Aeronautics of Oakland, California, and was on a local area dual instructional flight. Visual meteorological conditions prevailed at the time and no flight plan was filed for the operation. The certificated commercial pilot/flight instructor and the two students on board were not injured. The flight originated on the day of the mishap at about 1400 from the Oakland International Airport.

In his written statement, the flight instructor reported that the student was performing touch and go pattern operations on runway 7L at the Livermore airport. The instructor said that the student flared about 8 to 10 feet above the runway and "abruptly reduced the throttle." The aircraft then made a very hard touchdown. The instructor stated that he took control of the aircraft during the bounce and successfully initiated a go-around. The pilot evaluated the aircraft systems for any possible damage and, concluding there was none, continued the flight.

After the aircraft returned to the Oakland airport for refueling, the pilot noted the damage to the left prop. Maintenance personnel discovered damage to the left main wing spar.

Aircraft

Registration
N6626X
Reported as
Beech 76
Category
Airplane
Serial number
ME210
Airframe hours
7,249
Engine
Lycoming O-360-A1G6D, 180 horsepower, reciprocating
Damage
Substantial damage
Flight
Instructional · Part 91
Operator
Sierra Academy Of Aeronautics, doing business as Sierra Technicians Institute
Registered owner
Aircraft Holdings
Airworthiness certificate
Standard, Normal
Last inspection
AAIP · October 14, 1993 · 29 hours before
Departed
OAK · Oakland, CA
Airport
O48 · Livermoore Municipal, runway 7L, 5,255 × 100 ft, asphalt

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
31
Certificates
Commercial, Flight instructor
Airplane ratings
Single-engine land, Multi-engine land
Instrument ratings
Airplane
Medical
Class 1, Valid Medical--no waivers/lim.
Seat
Right
Flight hours
1,377 total · 214 in this make and model · 1,315 as pilot in command · 196 in the last 90 days · 72 in the last 30 days · 4 in the last 24 hours

Weather

Conditions
Visual (VMC) · Day
Wind
340° at 7 knots
Visibility
10 statute miles
Lowest ceiling
None

FAA reports on this event · 1

The FAA’s own accident and incident reports, matched to the aircraft by N-number and date.