# NTSB OAK75DVD39: Grum Amer AA1-B, N9601L, Tracy, CA, March 16, 1975

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Closed
- Date: March 16, 1975
- Place: Tracy, CA · TRACY, CA
- Location: 37.7274° N, 121.4522° W: Placed by OpenAirDocs: center of Tracy, CA, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=37.7274&lon=-121.4522&mi=10
- Phase of flight: [Approach](https://openairdocs.org/ntsb-phases/500) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 2 uninjured
- Status: Completed, report April 10, 1975
- Report: Brief approved by the director
- NTSB case key (mKey): 147939
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=OAK75DVD39
- Page: https://openairdocs.org/ntsb/OAK75DVD39

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-0348  75/3/16    TRACY,CA            GRUM AMER AA1-B     CR-  0  0  2  INSTRUCTIONAL             COMMERCIAL, FL.INSTR.,
        TIME - 1430                    N9601L              PX-  0  0  0  DUAL                      AGE 31, 444 TOTAL HOURS,
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            93 IN TYPE, NOT
                                                                                                   INSTRUMENT RATED.
        NAME OF AIRPORT - NEW JERUSALEM
        DEPARTURE POINT             INTENDED DESTINATION         LAST ENROUTE STOP
          MODESTO,CA                  LIVERMORE,CA                 TRACY,CA
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           UNDERSHOOT                                               LANDING: FINAL APPROACH
           GROUND-WATER LOOP-SWERVE                                 LANDING: ROLL
        PROBABLE CAUSE(S)
           DUAL STUDENT - MISJUDGED DISTANCE AND ALTITUDE
           PILOT IN COMMAND - INADEQUATE SUPERVISION OF FLIGHT
           DUAL STUDENT - FAILED TO MAINTAIN DIRECTIONAL CONTROL
        FACTOR(S)
           WEATHER - DOWNDRAFT,UPDRAFTS
           MISCELLANEOUS ACTS,CONDITIONS - SIMULATED CONDITIONS
        WEATHER BRIEFING - UNKNOWN/NOT REPORTED
        SKY CONDITION                                            CEILING AT ACCIDENT SITE
          SCATTERED                                                UNLIMITED
        VISIBILITY AT ACCIDENT SITE                              PRECIPITATION AT ACCIDENT SITE
          5 OR OVER(UNLIMITED)                                     NONE
        OBSTRUCTIONS TO VISION AT ACCIDENT SITE                  RELATIVE BEARING OF WIND
          NONE                                                     LEFT QUARTERING HEAD WIND 293-337 DEGREES
        TEMPERATURE-F                                            WIND DIRECTION-DEGREES
           56                                                      260
        WIND VELOCITY-KNOTS                                      TYPE OF WEATHER CONDITIONS
           8                                                       VFR
        TYPE OF FLIGHT PLAN
          NONE
        REMARKS- STUDENT UNDERSHOT SIM FORCED LDG,THEN LOST CTL.
```

## Aircraft

- Registration: [N9601L](https://openairdocs.org/deregistered/N9601L-2013-05-23), registration cancelled 2013-05-23, S/N AA1B-0183, built 1973 (OpenAirDocs)
- Reported make and model: GRUM AMER AA1-B
- Registry model: [Grumman American Avn. AA-1B](https://openairdocs.org/model/grumman-american-avn-aa-1b) (registry code 3960103) (OpenAirDocs)
- Registry engine: [Lycoming 0-235 series](https://openairdocs.org/engine/lycoming-0-235-series) (registry code 41505, 4 cycle) (OpenAirDocs)
- Category: Airplane
- Engines: reciprocating
- Damage: Substantial damage
- Airport: New Jerusalem

## 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 19750316004299A](https://openairdocs.org/incident/19750316004299A), Mar 16, 1975: Grumav AA1B, Tracy, CA, Substantial damage. Student undershot sim forced ldg,then lost ctl.

## Other investigations on N9601L (1)

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 LAX88LA184](https://openairdocs.org/ntsb/LAX88LA184), May 15, 1988: Grumman American AA-1B (N9601L), San Carlos, CA, 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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