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ASN Wikibase Occurrence # 37799
Last updated: 22 April 2020
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Date:29-NOV-1993
Time:17:49
Type:Silhouette image of generic M20T model; specific model in this crash may look slightly different
Mooney M20K
Owner/operator:private
Registration: N5788U
C/n / msn: 25-0852
Fatalities:Fatalities: 2 / Occupants: 2
Other fatalities:0
Aircraft damage: Written off (damaged beyond repair)
Category:Accident
Location:June Lake, CA -   United States of America
Phase: En route
Nature:Private
Departure airport:Carson City, NV (O04)
Destination airport:Chino, CA (CNO)
Investigating agency: NTSB
Narrative:
THE PILOT DEPARTED ON A 329 NAUTICAL MILE CROSS-COUNTRY FLIGHT OVER MOUNTAINS AND DID NOT FILE A FLIGHT PLAN. ABOUT 88 MILES FROM THE DEPARTURE POINT, THE AIRPLANE CRASHED, BUT WAS MISSING FOR ABOUT EIGHT MONTHS. IT WAS FOUND AT ABOUT THE 12,200 FOOT LEVEL OF A MOUNTAIN, ABOUT 2 MILES WEST OF THE DIRECT COURSE LINE FROM THE DEPARTURE POINT TO THE DESTINATION. AN INVESTIGATION REVEALED EVIDENCE OF AN IN-FLIGHT BREAKUP. WRECKAGE DEBRIS WAS FOUND OVER A 1,500 FOOT AREA. THE EMPENNAGE HAD SEPARATED FROM THE FUSELAGE, BUT WAS NOT FOUND, EXCEPT THE RUDDER AND ELEVATOR COUNTERWEIGHTS WERE FOUND IN DEBRIS NORTH OF THE FUSELAGE. THE AIRPLANE WAS EQUIPPED WITH AN AREA NAVIGATION SYSTEM, LORAN-C, AND A PORTABLE GPS. THE AUTOPILOT WAS FOUND ENGAGED. EXAMINATION OF THE WRECKAGE REVEAL THAT A PITCH TRIM SPRING IN THE AUTOPILOT PITCH SERVO HAD FAILED DUE TO FATIGUE. FURTHER EXAMINATION REVEALED THE AVIONICS IN THE AIRPLANE BELONGED TO AN AIRPLANE THAT HAD BEEN REPORTED STOLEN. THERE WERE NO RECORDS FOUND OF ANY INSPECTIONS OR MAINTENANCE BEING PERFORMED ON THE ACCIDENT AIRPLANE. CAUSE: THE PILOT ALLOWED THE AIRPLANE TO EXCEED ITS DESIGN LIMITS (AIRSPEED AND/OR STRESS LIMITS) AFTER INADVERTENTLY ENTERING A DESCENT. FACTORS RELATING TO THE ACCIDENT WERE: DARKNESS (NIGHT OR LATE DUSK), THE PILOT'S FAILURE TO ASSURE ADEQUATE MAINTENANCE/INSPECTION OF THE AIRPLANE, AND FATIGUE FAILURE OF A PITCH TRIM SPRING IN THE AUTOPILOT PITCH SERVO.

Sources:

NTSB: https://www.ntsb.gov/ntsb/brief.asp?ev_id=20001211X13746


Revision history:

Date/timeContributorUpdates
24-Oct-2008 10:30 ASN archive Added
21-Dec-2016 19:23 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]
12-Jan-2019 10:50 BEAVERSPOTTER Updated [Cn]

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