# NTSB CHI73ACO47: Enstrom F-28A, N4925, Lexington, KY, November 7, 1972

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Closed
- Date: November 7, 1972
- Place: Lexington, KY · LEXINGTON, KY
- Location: 37.9887° N, 84.4777° W: Placed by OpenAirDocs: center of Lexington, KY, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=37.9887&lon=-84.4777&mi=10
- Phase of flight: [Emergency descent](https://openairdocs.org/ntsb-phases/600) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 2 uninjured
- Status: Completed, report March 22, 1973
- Report: Brief approved by the director
- NTSB case key (mKey): 168926
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CHI73ACO47
- Page: https://openairdocs.org/ntsb/CHI73ACO47

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-3408   72/11/7   LEXINGTON,KY        ENSTROM F-28A       CR-  0  0  2  INSTRUCTIONAL             ATP,FLIGHT INSTR., AGE
        TIME - 1422                    N4925               PX-  0  0  0  CHECK                     32, 4712 TOTAL HOURS, 70
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            IN TYPE, INSTRUMENT
                                                                                                   RATED.
        NAME OF AIRPORT -  BLUE GRASS FIELD
        DEPARTURE POINT             INTENDED DESTINATION
          LEXINGTON,KY                LOCAL
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           ENGINE FAILURE OR MALFUNCTION                            IN FLIGHT: AUTOROTATIVE DESCENT
           HARD LANDING                                             LANDING: POWER-OFF AUTOROTATIVE LANDING
        PROBABLE CAUSE(S)
           CHECK PILOT - FAILED TO MAINTAIN ADEQUATE ROTOR R.P.M.
           CHECK PILOT - INADEQUATE SUPERVISION OF FLIGHT
           DUAL STUDENT - IMPROPER OPERATION OF FLIGHT CONTROLS
           DUAL STUDENT - FAILURE TO RELINQUISH CONTROL
        FACTOR(S)
           MISCELLANEOUS ACTS,CONDITIONS - CREW COORDINATION-POOR
        COMPLETE POWER LOSS - COMPLETE ENGINE FAILURE/FLAMEOUT-1 ENGINE
        EMERGENCY CIRCUMSTANCES - FORCED LANDING OFF AIRPORT ON LAND
```

## Aircraft

- Registration: [N4925](https://openairdocs.org/deregistered/N4925-1973-06-25), registration cancelled 1973-06-25, S/N 051 (OpenAirDocs)
- Reported make and model: ENSTROM F-28A
- Registry model: [Enstrom F-28A](https://openairdocs.org/model/enstrom-f-28a) (registry code 3300406) (OpenAirDocs)
- Category: Helicopter
- Engines: reciprocating
- Damage: Substantial damage
- Airport:  Blue Grass Field

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.

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