ASN Wikibase Occurrence # 43284
Last updated: 19 December 2014
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Date:15-JAN-1992
Time:1555
Type:Silhouette image of generic H500 model; specific model in this crash may look slightly different
Hughes 369D
Owner/operator:Sun Dun Of Washington
Registration: N8674F
C/n / msn: 970185D
Fatalities:Fatalities: 1 / Occupants: 1
Other fatalities:0
Airplane damage: Written off (damaged beyond repair)
Location:Edison, NJ -   United States of America
Phase: En route
Nature:Executive
Departure airport:New York, NY
Destination airport:Pasadena, MD
Narrative:
THE PILOT WAS RETURNING HOME, WHEN ACCORDING TO A WITNESS WHO SAW THE HELICOPTER ABOUT 800 FEET ABOVE THE GROUND, THE ENGINE SOUNDED NORMAL AT FIRST. SHORTLY THEREAFTER, THE ENGINE SPEED INCREASED FOLLOWED BY THE HELICOPTER 'DUTCH ROLLING' (BANKING) LEFT AND RIGHT FOR TWO CYCLES AND THEN ROLLED OVER ONE AND HALF TIMES NOSE FIRST AS IT DROPPED BEHIND THE TREES. THE HELICOPTER COLLIDED WITH POWER LINES BEFORE IMPACTING THE GROUND IN A NOSE DOWN ATTITUDE AND WAS DESTROYED BY POST-CRASH FIRE. EXAMINATION OF AIRCRAFT CONFIRMED CONTINUITY OF THE TRANSMISSION GEAR BOX, AND INTERNAL ROTATIONAL DAMAGE FOR THE ENGINE; HOWEVER, THERE WAS NO SIGNIFICANT ROTATIONAL DAMAGE TO THE MAIN ROTOR, TAIL ROTOR, AND ENGINE TO TRANSMISSION DRIVESHAFT (SHORT SHAFT). EXAMINATION OF THE SHAFT REVEALED IT HAD SEPARAED FROM THE BENDIX COUPLINGS AND WAS CRUSHED ALMOST FLAT. THERE WAS NO EVIDENCE OF ROTATIONAL DAMAGE BETWEEN THE SEPARATED HALVES. METALLURGICAL EXAMINATION REVEALED THE FUEL NOZZLE WAS CORRODED WITH FERROUS FIBERS. CAUSE: THE BLOCKAGE OF THE FUEL NOZZLE WHICH RESULTED IN PARTIAL LOSS OF ENGINE POWER. CONTRIBUTING WAS THE PILOT'S FAILURE TO MAINTAIN ROTOR RPM.

Sources:
NTSB: http://www.ntsb.gov/ntsb/brief.asp?ev_id=20001211X13940


Revision history:

Date/timeContributorUpdates
24-Oct-2008 10:30 ASN archive Added
Number of views: 844

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