ASN Wikibase Occurrence # 35771
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| Date: | Thursday 11 March 1993 |
| Time: | 22:20 LT |
| Type: |  Cessna 421C |
| Owner/operator: | Critical Air Medicine |
| Registration: | N2656N |
| MSN: | 714 |
| Total airframe hrs: | 4869 hours |
| Engine model: | CONTINENTAL GTSIO-520-L |
| Fatalities: | Fatalities: 3 / Occupants: 3 |
| Aircraft damage: | Destroyed |
| Category: | Accident |
| Location: | Eagle Mountain , CA -
 United States of America
|
| Phase: | En route |
| Nature: | Ferry/positioning |
| Departure airport: | Bermuda Dunes, CA |
| Parker, AZ (P20) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
A CESSNA 421 CRASHED AFTER AN INFLIGHT BREAKUP. INVESTIGATION DISCLOSED THAT THE LEFT OUTBOARD PORTION OF THE ELEVATOR ASSEMBLY (INCLUDING THE BALANCE WEIGHT) SEPARATED FIRST, RESULTING IN EMPENNAGE FLUTTER & SUBSEQUENT IN-FLIGHT BREAKUP OF THE EMPENNAGE. THE LEFT ELEVATOR OUTBOARD HINGE & SUPPORT STRUCTURE EXHIBITED EVIDENCE OF HINGE OVERTRAVEL. THE LEFT HORIZONTAL STABILIZER FRONT SPAR HAD FAILED DOWNWARD; RIVETS THAT ATTACHED THE LEFT OUTBOARD HINGE TO THE REAR SPAR OF THE LEFT STABILIZER HAD SHEARED; AND THE LEFT ELEVATOR CENTER HINGE HAD BEEN PULLED OFF THE REAR SPAR. ABOUT 100 FLIGHT HOURS BEFORE THE ACCIDENT, MAINTENANCE WAS PERFORMED TO REPAIR THE LEFT ELEVATOR BALANCE WEIGHT (WHICH WAS LOOSE) & TO REPAIR A DAMAGED STIFFENER IN THE CENTER STRUCTURE OF THE HORIZONTAL STABILIZER. HOWEVER, WHEN EXAMINED AFTER THE ACCIDENT, THE BALANCE WEIGHT WAS TIGHT & THE REPAIR TO THE STIFFENER WAS INTACT.
Probable Cause: FAILURE OF THE LEFT ELEVATOR FOR UNDETERMINED REASON(S), WHICH RESULTED IN FLUTTER AND FAILURE OF THE EMPENNAGE, AND SUBSEQUENT UNCONTROLLED COLLISION WITH THE TERRAIN.
Accident investigation:
 |
|
Sources:
NTSB LAX93FA149
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 24-Oct-2008 10:30 | ASN archive | Added |
| 21-Dec-2016 19:22 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 10-Apr-2024 15:21 | ASN Update Bot | Updated [Time, Cn, Other fatalities, Departure airport, Source, Narrative, Category, Accident report] |
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