# NTSB DEN76AD051: Grum Amer AA-5, N5475L, Boulder, CO, May 23, 1976

- Type: NTSB accident investigation
- Classification: Accident · Fatal · Closed
- Date: May 23, 1976
- Place: Boulder, CO · BOULDER, CO
- Location: 40.0244° N, 105.2513° W: Placed by OpenAirDocs: center of Boulder, CO, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=40.0244&lon=-105.2513&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: Fatal
- Injuries: 1 fatal
- Status: Completed, report June 23, 1976
- Report: Brief approved by the director
- NTSB case key (mKey): 154180
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=DEN76AD051
- Page: https://openairdocs.org/ntsb/DEN76AD051

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-1178  76/5/23    BOULDER,CO          GRUM AMER AA-5      CR-  1  0  0  NONCOMMERCIAL             STUDENT, AGE 43, 54 TOTAL
        TIME - 1235                    N5475L              PX-  0  0  0  PLEASURE/PERSONAL TRANSP  HOURS, 12 IN TYPE, NOT
                                       DAMAGE-DESTROYED    OT-  0  0  0                            INSTRUMENT RATED.
        DEPARTURE POINT             INTENDED DESTINATION
          BROOMFIELD,CO               LOCAL
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           COLLISION WITH GROUND/WATER: CONTROLLED                  IN FLIGHT: NORMAL CRUISE
        PROBABLE CAUSE(S)
           PILOT IN COMMAND - BECAME LOST/DISORIENTED
           PILOT IN COMMAND - CONTINUED VFR FLIGHT INTO ADVERSE WEATHER CONDITIONS
        FACTOR(S)
           WEATHER - LOW CEILING
           WEATHER - RAIN
           TERRAIN - HIGH OBSTRUCTIONS
        WEATHER BRIEFING - PARTIAL BRIEFING BY FLIGHT SERVICE PERSONNEL, BY PHONE/RADIO, LIMITED BY PILOT ACTION
        WEATHER FORECAST - UNKNOWN/NOT REPORTED
        SKY CONDITION                                            CEILING AT ACCIDENT SITE
          OVERCAST                                                  0
        VISIBILITY AT ACCIDENT SITE                              PRECIPITATION AT ACCIDENT SITE
          1/4 MILE OR LESS                                         RAIN
        OBSTRUCTIONS TO VISION AT ACCIDENT SITE                  TYPE OF WEATHER CONDITIONS
          FOG                                                      IFR
        TYPE OF FLIGHT PLAN
          NONE
         FIRE AFTER IMPACT
        REMARKS- FLEW INTO OBSCURED MTN SLOPE.
```

## Aircraft

- Registration: [N5475L](https://openairdocs.org/deregistered/N5475L-1976-07-27), registration cancelled 1976-07-27, S/N AA50375 (OpenAirDocs)
- Reported make and model: GRUM AMER AA-5
- Registry model: [Grumman American Avn. AA-5](https://openairdocs.org/model/grumman-american-avn-aa-5) (registry code 3960104) (OpenAirDocs)
- Category: Airplane
- Engines: reciprocating
- Damage: Destroyed

## 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 19760523015359A](https://openairdocs.org/incident/19760523015359A), May 23, 1976: Grumav AA5, Boulder, CO, Destroyed. Flew into obscured mtn slope.

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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