ASN Wikibase Occurrence # 265801
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| Date: | Thursday 22 July 2021 |
| Time: | 08:45 LT |
| Type: |  Cessna 140 |
| Owner/operator: | |
| Registration: | N84BC |
| MSN: | 10255 |
| Year of manufacture: | 1946 |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Near Caddo Mills Municipal Airport (7F3), TX -
 United States of America
|
| Phase: | En route |
| Nature: | Private |
| Departure airport: | Dallas, TX (1F7) |
| Caddo Mills, TX | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The flight instructor reported that while on downwind in the traffic pattern, the airplane began to yaw to the right. He immediately took control of the airplane from the student pilot and applied full left aileron and rudder, which reduced the yaw, however, the airplane still would not fly straight. He performed an emergency landing to a field, but shortly after touching down, the airplane nosed over, coming to rest inverted. The airplane sustained substantial damage to the vertical stabilizer and rudder.
A postaccident inspection found that the forward vertical stabilizer attach bolt (P/N AN4-5A), nut (P/N AN365-428) and shim (P/N 0430010) were missing. (See figure 1) As a result of the missing hardware, the vertical stabilizer became unseated and bent aft in flight, which caused the uncommanded yawing motion. The hardware was not recovered.
Figure 1. Fin assembly.
The pilot reported that he was unaware of any recent maintenance in the affected area.
Probable Cause: The missing vertical stabilizer hardware, which resulted in a severe uncommanded yawing motion that necessitated an emergency landing, during which the airplane nosed over and sustained substantial damage to the vertical stabilizer.
Accident investigation:
 |
|
Sources:
NTSB CEN21LA450
https://flightaware.com/resources/registration/N84BC
FAA register: https://registry.faa.gov/AircraftInquiry/Search/NNumberResult?nNumberTxt=84BC
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 23-Jul-2021 00:21 | Captain Adam | Added |
| 23-Jul-2021 12:58 | Anon. | Updated [Time, Aircraft type, Registration, Cn, Operator, Location, Phase, Nature, Source, Damage, Narrative] |
| 25-Jun-2022 14:13 | ASN Update Bot | Updated [Time, Operator, Other fatalities, Nature, Departure airport, Destination airport, Source, Narrative, Category, Accident report] |
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