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ASN Wikibase Occurrence # 29985
Last updated: 8 October 2020
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Type:Silhouette image of generic C340 model; specific model in this crash may look slightly different
Cessna 340A
Owner/operator:Marko Foam Products, Inc.
Registration: N4347C
C/n / msn: 340A0538
Fatalities:Fatalities: 2 / Occupants: 2
Other fatalities:0
Aircraft damage: Written off (damaged beyond repair)
Location:Julian, California -   United States of America
Phase: En route
Departure airport:Santa Ana, CA (SNA)
Destination airport:Calexico, CA (CXO)
Investigating agency: NTSB
During en route cruise flight at an assigned altitude of 11,000 feet (msl) in instrument meteorological conditions, the airplane impacted mountainous terrain at 5,300 feet, in wings-level, descending flight. During the final 12 minutes of the flight (from 1046 to 1058 Pacific daylight time), recorded military search radar height values (primary radar returns) show the aircraft in a steady descent from 11,000 feet to 5,600 feet, where radar contact was lost. During the same time interval, recorded Mode C altitudes received at Los Angeles Air Traffic Control Center (Center) and SoCal Terminal Radar Approach Control (TRACON) indicated the aircraft was level at 11,000 feet. At 1055:49, when the pilot was handed off from SoCal TRACON to Los Angeles Center, the pilot checked in with the Center ". . . level at one one thousand." At 1057:28, the pilot asked the Center controller "what altitude you showing us at" to which the controller responded "not receiving your mode C right now sir." At 1057:37, the pilot transmitted "o k we'd like to climb to vfr on top, our uh altimeter just went down to uh fifty three hundred." The controller approved the pilot's request to climb to VFR conditions on-top and, at 1057:54, the pilot responded "roger we're out." No further transmissions were received from the aircraft. The airplane was equipped with a single instrument static pressure system with two heated static ports. The static system and static system instruments were damaged or destroyed by impact and post-crash fire sufficiently to preclude post-accident testing.
Probable Cause: Total blockage of the instrument static system due to ice.


FAA register: 1. FAA:

Revision history:

27-Sep-2008 01:00 ASN archive Added
24-Feb-2015 13:49 Dr. John Smith Updated [Time, Operator, Total fatalities, Total occupants, Other fatalities, Location, Country, Phase, Nature, Departure airport, Destination airport, Source, Damage, Narrative]
21-Dec-2016 19:16 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]
21-Dec-2016 19:20 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]
12-Dec-2017 19:16 ASN Update Bot Updated [Operator, Nature, Departure airport, Destination airport, Source, Narrative]

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