MIA00IA186

NTSB incident investigation · Grumman G-73T · Watson Island, FL · June 11, 2000

Incident · No injuriesIncident investigationFinal report
Date
June 11, 2000, 11:30 local (15:30 UTC)
Place
Watson Island, FL
Injuries
17 uninjured
Damage
Minor damage
Phase of flight
Taxi
Aircraft
N142PAGrumman G-73T
Weather
Day
Status
Completed · report May 8, 2001
Report
Approved by Office Director
FAA report
20000611035039I
Case key
49403

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

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Probable cause

the overload separations of the control yoke on the captain's side.

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.

Airframe/component/system failure/malfunctionTaxi - from landing
Flt control syst,yoke/control stick - overloadCause

Analysis

After landing, the pilot stayed on the step, and water taxied. The pilot had the control yoke up to his chest, and the captain's side control separated from the vertical column. Examination of the surface control column assembly, fitting P/N 112703, revealed that the fracture surface showed no evidence of preexisting fracture areas on any of the four fracture regions. All fractures were typical of overstress separations.

Factual narrative

On June 11, 2000, about 1130 eastern daylight time, a Grumman G-73T, N142PA, operated by Chalks Airlines Inc., had the captain's side control yoke separate while water taxiing at Watson Island, Florida. Visual meteorological conditions prevailed at the time and a VFR flight plan was filed for the 14 CFR Part 121 scheduled international flight. The airplane received minor damage. The two airline transport-rated pilots, and 15 passengers reported no injuries. The flight departed from Bimini, Bahamas, at an unknown time.

After landing, the pilot stayed on the step, and water taxied. The pilot had the control yoke up to his chest, and the captain's side control separated from the vertical column.

The surface control column assembly, fitting P/N 112703 was sent to the NTSB Materials Laboratory, Washington, D. C., for examination. According to the laboratory report, the assembly was fractured at the intersection of the stem and collar portion, with four separate fracture regions created. According to the NTSB Materials Laboratory factual report, "...visual examination of the fracture surface...showed no evidence of preexisting fracture areas on any of the four fracture regions. All fractures were typical of overstress separations."

Aircraft

Registration
N142PA
Reported as
Grumman G-73T
Category
Airplane
Serial number
J42
Airframe hours
28,180
Engine
P&W PT6A-34, 680 horsepower, turbo prop
Damage
Minor damage
Flight
Part 121
Registered owner
Chalks Airline
Airworthiness certificate
Standard, Transport
Last inspection
AAIP · April 26, 2000 · 150 hours before
Departed
NSB · Bimini, OF
Destination
MPB
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
28
Certificates
Airline transport, Commercial, Flight instructor
Airplane ratings
Single-engine land, Multi-engine land, Multi-engine sea
Instrument ratings
Airplane
Medical
Class 1, Valid Medical--no waivers/lim.
Seat
Left
Flight hours
4,533 total · 890 in this make and model · 4,010 as pilot in command · 265 in the last 90 days · 90 in the last 30 days · 5 in the last 24 hours

Weather

Conditions
Day
Wind
100° at 14 knots
Visibility
10 statute miles
Lowest ceiling
None
Temperature
82 °F, dew point 72 °F
Altimeter
30.00 inHg
Observed at
MIA

FAA reports on this event · 1

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

Other investigations on N142PA · 1

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