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NTSB Report
April 15, 1990 · Airship Industries Airship 600 Airship 60 · N602SK
Creswell, NC
Overview
Report Status
Probable Cause
Event Type
Accident
Date
April 15, 1990
Injury Outcomes
No injuries (4 uninjured)
Location
Creswell, NC
Aircraft
Airship Industries Airship 600 Airship 60
Tail Number
N602SK
Operator
Airship Industries
Injuries
None
Aircraft Damage
Substantial
NTSB Number
ATL90FA099
WHILE CRUISING AT 700 FT ON A CROSS-COUNTRY FLIGHT, THE AIRSHIP HAD A COMPLETE LOSS OF POWER IN BOTH ENGINES. SUBSEQUENTLY, THE AIRSHIP COLLIDED WITH TREES & THE TERRAIN DURING A FORCED LANDING IN 20 KT WINDS. AN INVESTIGATION REVEALED THAT THE AIRSHIP HAD TRAVERSED THE BEAM OF A HIGHLY DIRECTIONAL RADIO FREQUENCY BROADCAST FROM A VOICE OF AMERICA ANTENNA. THE SIGNAL RADIATING FROM THE ANTENNA HAD BEEN DEMONSTRATED TO DAMAGE ELECTRONIC IGNITION CONTROL UNITS OF THE SAME TYPE USED ON THE AIRSHIP ENGINES. SUBSEQUENT TESTS OF THE FAILED IGNITION UNITS SHOWED THAT THE FAILURE MODE IN THIS ACCIDENT REPLICATED THE FAILURES OF THE PREVIOUSLY TESTED IGNITION UNITS. AT THE TIME OF CERTIFICATION, AIRSHIP REQUIREMENTS FOR HIRF (HIGH INTNESITY RADIATED ELECTROMAGNETIC FIELDS) TESTING HAD NOT BEEN ISSUED.
NTSB Probable Cause
THE FAILURE OF THE ELECTRONIC IGNITION UNITS AS THE AIRSHIP TRAVERSED THE DIRECTIONAL ANTENNA BEAM OF A HIGH INTENSITY RADIATED ELECTROMAGNETIC FIELD (HIRF). FACTORS RELATED TO THE ACCIDENT WERE: THE UNFAVORABLE WIND AND THE LACK OF HIRF CERTIFICATION STANDARDS FOR AIRSHIPS AT THE TIME OF FAA CERTIFICATION.
Full Narrative
WHILE CRUISING AT 700 FT ON A CROSS-COUNTRY FLIGHT, THE AIRSHIP HAD A COMPLETE LOSS OF POWER IN BOTH ENGINES. SUBSEQUENTLY, THE AIRSHIP COLLIDED WITH TREES & THE TERRAIN DURING A FORCED LANDING IN 20 KT WINDS. AN INVESTIGATION REVEALED THAT THE AIRSHIP HAD TRAVERSED THE BEAM OF A HIGHLY DIRECTIONAL RADIO FREQUENCY BROADCAST FROM A VOICE OF AMERICA ANTENNA. THE SIGNAL RADIATING FROM THE ANTENNA HAD BEEN DEMONSTRATED TO DAMAGE ELECTRONIC IGNITION CONTROL UNITS OF THE SAME TYPE USED ON THE AIRSHIP ENGINES. SUBSEQUENT TESTS OF THE FAILED IGNITION UNITS SHOWED THAT THE FAILURE MODE IN THIS ACCIDENT REPLICATED THE FAILURES OF THE PREVIOUSLY TESTED IGNITION UNITS. AT THE TIME OF CERTIFICATION, AIRSHIP REQUIREMENTS FOR HIRF (HIGH INTNESITY RADIATED ELECTROMAGNETIC FIELDS) TESTING HAD NOT BEEN ISSUED.
Flight
Event TypeAccident
Event Time14:00 EDT
Nearest Airport0nm N
Runway0
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftAirship Industries Airship 600 Airship 60
Tail NumberN602SK
Aircraft CategoryBlim
DamageSubstantial
OperatorAirship Industries
Operating RulePart 91
Engines2
Engine TypeReciprocating
Engine DetailsPorsche · 930/67/A1/3 · Reciprocating · 255
Seats10
People & Injuries
Injury SummaryNo injuries (4 uninjured)
Fatal0
Serious0
Minor0
Uninjured4
Total4
Crew 1Age 42 · Second Class
Conditions
ConditionsVMC
LightDaylight
Wind290° @ 20 kt
Visibility15 sm
CeilingNone
Temperature / Dew Point66 F / 0 C
Altimeter0
Weather SourcePILO