Aircraft Accident/Incident Report

Near Sutton, Alaska 99674
Tuesady, August 17, 1982 10:05 AKD

NTSB Narrative Summary Released at Completion of Accident

THE PILOT HAD APPROACHED AND LANDED ON A BLUFF TO DISCHARGE HIS TWO PASSENGERS. HOWEVER, BEFORE DISCHARGING THE PASSENGERS, HE DECIDED TO TAKEOFF AND FIND A BETTER LANDING AREA. WHEN THE HELICOPTER WAS ABOUT 10 TO 20 FT FROM THE TAKEOFF POINT, BUT APPROXIMATELY 200 FT AGL, THERE WAS A DECREASE IN RPM. INITIALLY, THE PILOT THOUGHT HE WAS SETTLING WITH POWER. HE LOWERED THE NOSE AND COLLECTIVE, BUT WAS UNABLE TO REGAIN THE RPM, BUT HE FELT THE HELICOPTER YAW TO THE LEFT. HE FELT MAST-BUMPING AND REALIZED HE MUST BE CROSS-CONTROLLING WITH TOO MUCH RIGHT PEDAL AND LEFT CYCLIC. HE THEN ENTERED AN AUTOROTATION. THE HELICOPTER COLLIDED WITH TREES ON THE SIDE OF THE BLUFF AND ROLLED TO THE BOTTOM OF THE HILL. AN EXAMINATION REVEALED THAT THE NO-2 CYLINDER COMPRESSION WAS LOW. THE NO-2 INTAKE VALVE HAD BECOME TULIPED AND WAS LEAKING. THERE WAS EVIDENCE THAT IT HAD BEEN POUNDING. ALSO, THERE WAS INDICATIONS OF HIGH ENGINE RPM AND TEMPERATURE. THE HELICOPTER HAD BEEN FLOWN 38 HRS SINCE THE LAST INSPECTION.

NTSB Probable Cause Narrative

Not Yet Reported

Event Information

Type of Event Accident
Event Date 8/17/1982
Event Day of the Week Tuesday
Time of Event 1005
Event Time Zone --
Event City NEAR SUTTON
Event State ALASKA
Event Country --
Zipcode of the event site 99674
Event Date Year 1982
Event Date Month 8
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) 20
Air Temperature at event time (in degrees celsius) 58
Dew Point at event time (in degress fahrenheit) 0
Wind Direction (degrees magnetic) 0
Variable Wind Indicator Unknown
Wind Speed (knots) 0
Wind Velocity Indicator Calm
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 Minor
On Ground, Fatal Injuries 0
On Ground, Minor Injuries 0
On Ground, Serious Injuries 0
Injury Total Fatal --
Injury Total Minor 3
Injury Total None --
Injury Total Serious --
Injury Total All 3
Investigating Agency NTSB
NTSB Docket Number (internal use) 3158
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 N5698E
NTSB Number ANC82DA075
Missing Aircraft Indicator N
Federal Aviation Reg. Part Part 91: General Aviation
Type of Flight Plan filed None
Flight plan Was Activated? --
Damage Substantial
Aircraft Fire None
Aircraft Explosion None
Aircraft Manufacturer's Full Name ENSTROM
Aircraft Model F-28F
Aircraft Series Identifier F-28F
Aircraft Serial Number 506
Certified Max Gross Weight 2350
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 28
Airframe Hours 770
ELT Installed Yes
ELT Activated Unknown
ELT Aided Location of Event Site Unknown
ELT Type --
Aircraft Owner Name ROBERT T. KEAN
Aircraft Owner Street Address SRA BOX 382-V
Aircraft Owner City ANCHORAGE
Aircraft Owner State AK
Aircraft Owner Country
Aircraft Owner Zipcode 99507
Operator is an individual? --
Operator Name KEAN & ASSOCIATES
Operator Same as Owner? No
Operator Is Doing Business As --
Operator Address Same as Owner? Yes
Operator Street Address SRA BOX 382-V
Operator City ANCHORAGE
Operator State AK
Operator Country
Operator Zip code 99507
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) Business
Second Pilot on Board No
Departure Point Same as Event Yes
Departure Airport Code
Departure City NEAR SUTTON
Departure State AK
Departure Country
Departure Time 1005
Departure Time Zone
Destination Same as Local Flt dest & departure same, accident can occur anywhere
Destination Airport Code
Destination City NEAR SUTTON
Destination State AK
Destination Country
Specific Phase of Flight Landing
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 --