# NTSB LAX71IL044: Boeing 727, N1991, Imperial, CA, January 2, 1971

- Type: NTSB incident investigation
- Classification: Incident · Minor injuries · Closed
- Date: January 2, 1971
- Place: Imperial, CA · IMPERIAL, CA
- Location: 32.8388° N, 115.5720° W: Placed by OpenAirDocs: center of Imperial, CA, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=32.8388&lon=-115.5720&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: Minor injuries
- Injuries: 4 minor, 91 uninjured
- Status: Completed, report November 23, 1971
- Report: Brief approved by the director
- NTSB case key (mKey): 160382
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=LAX71IL044
- Page: https://openairdocs.org/ntsb/LAX71IL044

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
4-0006   71/1/2  NR.IMPERIAL,CALIF     BOEING 727          CR-  0  0  9  SCHED DOM PASSG SRV       CERTIFICATE UNKNOWN, AGE
        TIME - 0740                    N1991               PX-  0  0 86                            UNK/NR, UNK/NR TOTAL
                                       DAMAGE-NONE         OT-  0  0  0                            HOURS, UNK/NR IN TYPE,
                                                                                                   UNK/NR INSTRUMENT RATED.
        CLASSIFIED AS INCIDENT
        OPERATOR - AMERICAN AIRLINES,INC.
        DEPARTURE POINT             INTENDED DESTINATION         LAST ENROUTE STOP
          SAN DIEGO,CALIF             NEW YORK,NY                  PHOENIX,ARIZ
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           TURBULENCE                                               IN FLIGHT: OTHER
        PROBABLE CAUSE(S)
           WEATHER - TURBULENCE IN FLIGHT,CLEAR AIR
        FACTOR(S)
           MISCELLANEOUS ACTS,CONDITIONS - SEAT BELT SIGN ON
        WEATHER BRIEFING - BRIEFING RECEIVED-METHOD UNKNOWN
        WEATHER FORECAST - FORECAST SUBSTANTIALLY CORRECT
        SKY CONDITION                                            CEILING AT ACCIDENT SITE
          CLEAR                                                    UNLIMITED
        VISIBILITY AT ACCIDENT SITE                              PRECIPITATION AT ACCIDENT SITE
          5 OR OVER(UNLIMITED)                                     NONE
        OBSTRUCTIONS TO VISION AT ACCIDENT SITE                  TYPE OF WEATHER CONDITIONS
          NONE                                                     VFR
        TYPE OF FLIGHT PLAN
          IFR
        REMARKS- ATTENDANTS PREPARING AND SERVING FOOD.WX BUREAU  SIGMET BRAVO 1 ISSUED 0730-RCVD BY FSS AFTR INCDT
```

## Aircraft

- Registration: [N1991](https://openairdocs.org/deregistered/N1991-1994-11-22), registration cancelled 1994-11-22, S/N 18447 (OpenAirDocs)
- Reported make and model: BOEING 727
- Registry model: [Boeing 727-23](https://openairdocs.org/model/boeing-727-23) (registry code 1384004) (OpenAirDocs)
- Category: Airplane
- Engines: turbo fan
- Damage: No damage

## Other investigations on N1991 (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 FTW70IF075](https://openairdocs.org/ntsb/FTW70IF075), May 19, 1970: Boeing 727 (N1991), Oklahoma Cty, OK, incident, no 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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