Aircraft Accident/Incident Report

Near Mertzon, Texas 76941
Saturday, July 3, 1982 11:13 CDT

NTSB Narrative Summary Released at Completion of Accident

WHILE THE AIRCRAFT WAS BEING HOVERED LOW AND SLOW AROUND A WATER TROUGH, DIRECTIONAL CONTROL WAS LOST. THE PILOT AUTOROTATED TO THE GROUND AND ON TOUCHDOWN THE RIGHT SKID BUCKLED AND THE TAILROTOR GEARBOX SEPARATED WHEN IT STRUCK AN ANT HILL. THE PILOT ORIGINALLY REPORTED THAT ONE OF THE TAILROTOR BLADES HAD SEPARATED IN WHAT APPEARED TO BE FATIGUE. HOWEVER METALLURGICAL EXAMINATION OF THE FAILED PARTS INDICATED THAT ALL OF THE FRACTURES HAD OCCURED IN OVERLOAD. THE REPORTED WINDS WOULD HAVE BEEN CONDUCIVE TO LOSS OF TAILROTOR EFFECTIVENESS AT LOWER AIRSPEEDS.

NTSB Probable Cause Narrative

Not Yet Reported

Event Information

Type of Event Incident
Event Date 7/3/1982
Event Day of the Week Saturday
Time of Event 1113
Event Time Zone Central Daylight Time
Event City NEAR MERTZON
Event State TEXAS
Event Country --
Zipcode of the event site 76941
Event Date Year 1982
Event Date Month 7
MidAir Collision Indicator No
On Ground Collision occurred ? No
Event Location Latitude --
Event Location Longitude --
Event Location Airport
Event Location Nearest Airport ID
Indicates whether the acc/inc occurred off or on an airport Off Airport/Airstrip
Distance from airport in statute miles 0
Degrees magnetic from airport 0
Airport Elevation 0
Weather Briefing Completeness Unknown
Investigator's weather source Unknown
Time of the weather observation 0
Direction of event from weather observation facility (degrees) 0
Weather Observation Facility ID
Elevation of weather observation facility 0
Distance of event from weather observation facility (units?) 0
Time Zone of the weather observation
Lighting Conditions Day
Lowest Ceiling Height 0
Lowest Non-Ceiling Height 0
Sky/Lowest/Cloud Conditions Unknown
Sky Condition for Lowest Ceiling Unknown
Visibility Runway Visual Range (Feet) 0
Visibility Runway Visual Value (Statute Miles) 0
Visibility (Statute Miles) 50
Air Temperature at event time (in degrees celsius) 85
Dew Point at event time (in degress fahrenheit) 0
Wind Direction (degrees magnetic) 165
Variable Wind Indicator Unknown
Wind Speed (knots) 25
Wind Velocity Indicator Unknown
Wind Gust Indicator Unknown
Wind Gust (knots) 0
Altimeter Setting at event time (in. Hg) --
Density Altitude (feet) 0
Intensity of Precipitation Unknown
METAR weather report --
Event Highest Injury None
On Ground, Fatal Injuries 0
On Ground, Minor Injuries 0
On Ground, Serious Injuries 0
Injury Total Fatal --
Injury Total Minor --
Injury Total None 2
Injury Total Serious --
Injury Total All --
Investigating Agency NTSB
NTSB Docket Number (internal use) 5068
NTSB Notification Source --
NTSB Notification Date --
NTSB Notification Time 0
Fiche Number and/or location -used to find docket information
Date of most recent change to record Dec 18 2002 11:28AM
User who most recently changed record NTSB\GIUV
Basic weather conditions Visual Meteorological Cond
FAA District Office --

Aircraft Involved

Aircraft #1

Aircraft Registration Number N73983
NTSB Number FTW82IA268
Missing Aircraft Indicator N
Federal Aviation Reg. Part Part 91: General Aviation
Type of Flight Plan filed None
Flight plan Was Activated? --
Damage Minor
Aircraft Fire None
Aircraft Explosion None
Aircraft Manufacturer's Full Name BELL
Aircraft Model 47G2A1
Aircraft Series Identifier 47G2A1
Aircraft Serial Number 2873
Certified Max Gross Weight 2850
Aircraft Category Helicopter
Aircraft Registration Class Unknown
Aircraft is a homebuilt? No
Flight Crew Seats --
Cabin Crew Seats --
Passenger Seats --
Total number of seats on the aircraft 3
Number of Engines 1
Fixed gear or retractable gear Fixed
Aircraft, Type of Last Inspection Unknown
Date of Last Inspection --
Airframe hours since last inspection 0
Airframe Hours 8972
ELT Installed No
ELT Activated Unknown
ELT Aided Location of Event Site Unknown
ELT Type --
Aircraft Owner Name HAL E. NOELKE
Aircraft Owner Street Address 1213 E. AVE D.
Aircraft Owner City SAN ANGELO
Aircraft Owner State TX
Aircraft Owner Country
Aircraft Owner Zipcode 76901
Operator is an individual? --
Operator Name HAL E. NOELKE
Operator Same as Owner? Yes
Operator Is Doing Business As --
Operator Address Same as Owner? Yes
Operator Street Address 1213 E. AVE D.
Operator City SAN ANGELO
Operator State TX
Operator Country
Operator Zip code 76901
Operator Code
Owner has at least one certificate Yes - certificate holder
Other Operator of large aircraft? No
Certified for Part 133 or 137 Operation Unknown
Operator Certificate Number --
Indicates whether an air carrier operation was scheduled or not --
Indicates Domestic or International Flight --
Operator carrying Pax/Cargo/Mail --
Type of Flying (Per_Bus / Primary) Unknown
Second Pilot on Board No
Departure Point Same as Event Yes
Departure Airport Code
Departure City NEAR MERTZON
Departure State TX
Departure Country
Departure Time 11
Departure Time Zone
Destination Same as Local Flt dest & departure same, accident can occur anywhere
Destination Airport Code
Destination City NEAR MERTZON
Destination State TX
Destination Country
Specific Phase of Flight Maneuvering
Report sent to ICAO? --
Evacuation occurred --
Date of most recent change to record Sep 18 2002 4:50PM
User who most recently changed record dbo
Since inspection or accident --
Event Location Runway Number and Location 0
Runway Length 0
Runway Width 0
Sight Seeing flight No
Air Medical Flight No
Medical Flight --