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ASN Wikibase Occurrence # 43526
Last updated: 11 August 2019
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Date:19-MAY-1994
Time:17:54
Type:Silhouette image of generic AC50 model; specific model in this crash may look slightly different
Aero Commander 500A
Owner/operator:private
Registration: N601MK
C/n / msn: 500A-1073
Fatalities:Fatalities: 4 / Occupants: 4
Other fatalities:0
Aircraft damage: Written off (damaged beyond repair)
Category:Accident
Location:Livermore, CA -   United States of America
Phase: Landing
Nature:Private
Departure airport:Hayward, CA (HWD)
Destination airport:
Investigating agency: NTSB
Narrative:
THE AIRCRAFT HAD NOT FLOWN FOR 2 YEARS. BEFORE FLIGHT, A MECHANIC SAW EVIDENCE OF FUEL LEAKING AT DRAIN HOLES IN THE LEFT WING ROOT, JUST AFT OF THE MAIN CABIN DOOR. HE BROUGHT THIS TO THE ATTENTION OF THE PILOT-RATED PASSENGER, WHO SHORTLY THEREAFTER, DEPARTED IN THE AIRCRAFT WITH THE PILOT (PIC), THE AIRCRAFT OWNER & A PASSENGER/MECHANIC. ABOUT 14 MINUTES AFTER TAKEOFF, RADAR DATA SHOWED THE AIRCRAFT TRANSITIONING FROM A CLIMB TO A DESCENT, WHILE IN A 180 DEGREE TURN. ALSO, WITNESSES SAW SMOKE/FLAMES TRAILING FROM THE AIRCRAFT. SUBSEQUENTLY, THE AIRCRAFT IMPACTED TREES & POWER LINES, THEN IT CRASHED IN A SMALL FLAT FIELD IN HILLY TERRAIN. POST-CRASH EXAMINATION REVEALED MELTED ALUMINUM SPATTERS ON THE LEADING EDGE & UNDERSIDE OF THE LEFT HORIZONTAL STABILIZER. ALSO, 'FOCALIZED' FIRE DAMAGE WAS NOTED ON THE CABIN BEHIND THE DRAIN HOLES IN THE LEFT WING ROOT. TETRAHYDROCANNABINOL CARBOXYLIC ACID (MARIJUANA) WAS DETECTED IN THE PILOT-RATED PASSENGER'S BLOOD (0.004 UG/ML) & URINE (0.010 UG/ML). CAUSE: A FUEL SYSTEM LEAK, INADEQUATE PREFLIGHT BY THE PILOT (PIC), AND BY THE NON-FLYING PILOT/PASSENGER INTENTIONALLY ALLOWING OPERATION OF THE AIRCRAFT WITH A KNOWN DEFICIENCY (FUEL LEAK). A FACTOR RELATED TO THE ACCIDENT WAS: THE LACK OF SUITABLE TERRAIN FOR A FORCED LANDING.

Sources:

NTSB: http://www.ntsb.gov/ntsb/brief.asp?ev_id=20001206X01388


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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