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ASN Wikibase Occurrence # 43283
Last updated: 22 May 2020
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Date:18-APR-1994
Time:13:14
Type:Silhouette image of generic H500 model; specific model in this crash may look slightly different
Hughes 500D (369D)
Owner/operator:Pacific Aviation International
Registration: N1103N
C/n / msn: 410945D
Fatalities:Fatalities: 1 / Occupants: 5
Other fatalities:0
Aircraft damage: Written off (damaged beyond repair)
Category:Accident
Location:Hanapepe, HI -   United States of America
Phase: Manoeuvring (airshow, firefighting, ag.ops.)
Nature:Unknown
Departure airport:HI (PAK)
Destination airport:
Investigating agency: NTSB
Narrative:
THE PILOT REPORTED THAT WHILE MANEUVERING NEAR A WATERFALL ON A SIGHT-SEEING FLIGHT, THE HUGHES 369D SUSTAINED A LOSS OF ENGINE POWER, DESCENDED, AND LANDED HARD ON ROUGH/ROCKY TERRAIN. AN EXAM OF THE ENGINE REVEALED THE FUEL NOZZLE STRAINER WAS CONTAMINATED AND BLOCKED WITH SODIUM, AND IT WAS PARTIALLY COLLAPSED. TESTS OF THE NOZZLE REVEALED THAT FLOW RATES WERE BELOW THE MANUFACTURER'S SPECIFICATIONS. THE HELICOPTER WAS BEING OPERATED EXCLUSIVELY IN A MARINE ENVIRONMENT AND THE OPERATOR PERFORMED COMPRESSOR WASH PROCEDURES ON A DAILY BASIS. IN A SERVICE LETTER, THE ENGINE MANUFACTURER PRESCRIBED TURBINE ENGINE COMPRESSOR WASH PROCEDURES WHICH RESULTED IN IMMERSION OF THE FUEL NOZZLE IN CONTAMINATED WASH WATER. THERE WAS EVIDENCE OF SUBSEQUENT INFILTRATION OF WASH WATER INTO THE FUEL NOZZLE STRAINER. THE FUEL NOZZLE STRAINER HAD A LIFE LIMIT OF 2500 HOURS, BUT ACCORDING TO THE MANUFACTURER, IT WAS NOT SUBJECT TO ANY PRIOR ROUTINE INSPECTION REQUIREMENT. CAUSE: INADEQUATE TURBINE ENGINE COMPRESSOR CLEANING PROCEDURES BASED ON INFORMATION IN THE MANUFACTURER'S SERVICE LETTER, AND LOSS OF ENGINE POWER DUE TO BLOCKAGE OF THE FUEL NOZZLE STRAINER WITH FOREIGN MATERIAL (SODIUM). FACTORS RELATED TO THE ACCIDENT WERE: THE LACK OF A SPECIFIED SERVICE REQUIRMENT FOR INSPECTION OF THE FUEL STRAINER, AND TERRAIN CONDITIONS IN THE EMERGENCY LANDING AREA.

Sources:

NTSB: http://www.ntsb.gov/ntsb/brief.asp?ev_id=20001206X01118


Revision history:

Date/timeContributorUpdates
24-Oct-2008 10:30 ASN archive Added
21-Dec-2016 19:24 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]

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