# NTSB OAK77FVM18: Cessna 421A, N1BV, Morgan Hill, CA, June 12, 1977

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Closed
- Date: June 12, 1977
- Place: Morgan Hill, CA · MORGAN HILL, CA
- Location: 37.1325° N, 121.6419° W: Placed by OpenAirDocs: center of Morgan Hill, CA, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=37.1325&lon=-121.6419&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 4 uninjured
- Status: Completed, report July 26, 1977
- Report: Brief approved by the director
- NTSB case key (mKey): 157312
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=OAK77FVM18
- Page: https://openairdocs.org/ntsb/OAK77FVM18

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-1252  77/6/12  NR.MORGAN HILL,CA     CESSNA 421A         CR-  0  0  1  NONCOMMERCIAL             COMMERCIAL, AGE 60, 2175
        TIME - 1230                    N1BV                PX-  0  0  3  PLEASURE/PERSONAL TRANSP  TOTAL HOURS, 1200 IN
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            TYPE, NOT INSTRUMENT
                                                                                                   RATED.
        DEPARTURE POINT             INTENDED DESTINATION
          BIG BEAR,CA                 SAN CARLOS,CA
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           AIRFRAME FAILURE: IN FLIGHT                              IN FLIGHT: NORMAL CRUISE
        PROBABLE CAUSE(S)
           SYSTEMS - FLIGHT CONTROL SYSTEMS: ELEVATOR AND ELEVATOR TAB CONTROL SYSTEM
           MISCELLANEOUS ACTS,CONDITIONS - IMPROPERLY SECURED
           MISCELLANEOUS ACTS,CONDITIONS - DISCONNECTED
           MISCELLANEOUS ACTS,CONDITIONS - FLUTTER
           PERSONNEL - MAINTENANCE,SERVICING,INSPECTION: IMPROPER MAINTENANCE (MAINTENANCE PERSONNEL)
        EMERGENCY CIRCUMSTANCES - PRECAUTIONARY LANDING ON AIRPORT
                                  PITCH CONTROL PROBLEM
                                  AIRFRAME BUFFET
        REMARKS- BOLT IN ELEVATOR TRIM TAB ACTUATING ROD DROPPED OUT DESTRUCTIVE FLUTTER FOLLOWED.
```

## Aircraft

- Registration: [N1BV](https://openairdocs.org/deregistered/N1BV-1990-02-21), registration cancelled 1990-02-21, S/N 421A0007 (OpenAirDocs)
- Reported make and model: CESSNA 421A
- Registry model: [Cessna 421A](https://openairdocs.org/model/cessna-421a) (registry code 2076012) (OpenAirDocs)
- Category: Airplane
- Engines: reciprocating
- Damage: Substantial damage

## FAA reports on this event (1)

The FAA's own accident and incident reports, matched to the aircraft by N-number and date (OpenAirDocs).

- [Accident 19770612016719A](https://openairdocs.org/incident/19770612016719A), Jun 12, 1977: Cessna 421A, Morgan Hill, CA, Substantial damage. Bolt in elevator trim tab actuating rod dropped out destructive flutter followed.

From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.