# NTSB MIA74AM031: Grumman G-21A, N4772C, Christiansted, PR, October 13, 1973

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Closed
- Date: October 13, 1973
- Place: Christiansted, PR · CHRISTIANSTED,VI, PR
- Phase of flight: [Takeoff](https://openairdocs.org/ntsb-phases/300) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 10 uninjured
- Status: Completed, report November 2, 1973
- Report: Brief approved by the director
- NTSB case key (mKey): 188588
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=MIA74AM031
- Page: https://openairdocs.org/ntsb/MIA74AM031

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-2846  73/10/13   CHRISTIANSTED,VI    GRUMMAN G-21A       CR-  0  0  1  COMMERCIAL                AIRLINE TRANSPORT, AGE
        TIME - 0820                    N4772C              PX-  0  0  9  COMMUTER AIR CARRIER      51, 9734 TOTAL HOURS, 289
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0  AIR TAXI-PASSG S-D        IN TYPE, INSTRUMENT
                                                                                                   RATED.
        DEPARTURE POINT             INTENDED DESTINATION
          CHRISTIANSTED,VI            SAN JUAN,PR
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           COLLIDED WITH: OBJECT                                    TAKEOFF: RUN
        PROBABLE CAUSE(S)
           PILOT IN COMMAND - FAILED TO SEE AND AVOID OBJECTS OR OBSTRUCTIONS
        FACTOR(S)
           PILOT IN COMMAND - INADEQUATE PREFLIGHT PREPARATION AND/OR PLANNING
           TERRAIN - OTHER
        REMARKS- HIT MARKER BUOY DRG WATER TKOF. HAD PORPOISED ON TKOF RUN.
```

## Aircraft

- Registration: [N4772C](https://openairdocs.org/deregistered/N4772C-1977-01-14), registration cancelled 1977-01-14, S/N B-131 (OpenAirDocs)
- Reported make and model: GRUMMAN G-21A
- Registry model: [Grumman G-21A](https://openairdocs.org/model/grumman-g-21a) (registry code 3951204) (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 19731013033339A](https://openairdocs.org/incident/19731013033339A), Oct 13, 1973: Gruman G21A, Christiansted, Puerto Rico, Substantial damage. Hit marker buoy drg water tkof. Had porpoised on tkof run.

## Other investigations on N4772C (2)

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.

- [NTSB MIA76AM066](https://openairdocs.org/ntsb/MIA76AM066), Feb 21, 1976: Grumman G-21A (N4772C), St Croix, VI, destroyed, 5 fatal
- [NTSB ANC71FAD05](https://openairdocs.org/ntsb/ANC71FAD05), Nov 26, 1970: Grumman G-21A (N4772C), Wrangell, AK, substantial damage

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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