# NTSB LAX72AL009: Grumman G-21A, N11CS, Avalon, CA, July 30, 1971

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Closed
- Date: July 30, 1971
- Place: Avalon, CA · AVALON, CA
- Location: 33.3440° N, 118.3214° W: Placed by OpenAirDocs: center of Avalon, CA, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=33.3440&lon=-118.3214&mi=10
- Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 17 uninjured
- Status: Completed, report January 31, 1972
- Report: Brief approved by the director
- NTSB case key (mKey): 162647
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=LAX72AL009
- Page: https://openairdocs.org/ntsb/LAX72AL009

## NTSB brief (aircraft 2)

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-1861  71/7/30    AVALON,CALIF        GRUMMAN G-21A       CR-  0  0  1  COMMERCIAL                AIRLINE TRANSPORT, AGE
        TIME - 1348                    N13CS               PX-  0  0  7  COMMUTER AIR CARRIER      54, 19400 TOTAL HOURS,
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  9  AIR TAXI-PASSG S-D        5000 IN TYPE, INSTRUMENT
                                                                                                   RATED.
        NAME OF AIRPORT - AVALON BAY
        DEPARTURE POINT             INTENDED DESTINATION
          AVALON,CALIF                SAN PEDRO,CALIF
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           COLLISION WITH AIRCRAFT: ONE AIRBORNE                    TAKEOFF: OTHER
        PROBABLE CAUSE(S)
           PILOT IN COMMAND - FAILED TO SEE AND AVOID OTHER AIRCRAFT
           PERSONNEL - MISCELLANEOUS-PERSONNEL: PILOT OF OTHER AIRCRAFT
        REMARKS- T/O RUN OF N13CS PARTIALLY HIDDEN BY LARGE BOAT.ABORTED,WAS STOPPED AT IMPACT.NO CTC BETWEEN ACFT.
```

## NTSB brief (aircraft 1)

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-1861  71/7/30    AVALON,CALIF        GRUMMAN G-21A       CR-  0  0  1  COMMERCIAL                COMMERCIAL, AGE 42, 15300
        TIME - 1348                    N11CS               PX-  0  0  8  COMMUTER AIR CARRIER      TOTAL HOURS, 3052 IN
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  8  AIR TAXI-PASSG S-D        TYPE, INSTRUMENT RATED.
        NAME OF AIRPORT - AVALON BAY
        DEPARTURE POINT             INTENDED DESTINATION
          SAN PEDRO,CALIF             AVALON,CALIF
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           COLLISION WITH AIRCRAFT: ONE AIRBORNE                    LANDING: OTHER
        PROBABLE CAUSE(S)
           PILOT IN COMMAND - FAILED TO SEE AND AVOID OTHER AIRCRAFT
           PERSONNEL - MISCELLANEOUS-PERSONNEL: PILOT OF OTHER AIRCRAFT
        FACTOR(S)
           MISCELLANEOUS ACTS,CONDITIONS - AIRCRAFT CAME TO REST IN WATER
        REMARKS- N11CS SAW N13CS JUST BEFORE T/D.EVASIVE MANEUVER UNSUCCESSFUL. N11CS LOST R FLOAT,ROLLED OVER.
```

## Aircraft 1

- Registration: [N11CS](https://openairdocs.org/deregistered/N11CS-1980-07-10), registration cancelled 1980-07-10, S/N 1166, built 1947 (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
- Airport: Avalon Bay

## Aircraft 2

- Registration: [N13CS](https://openairdocs.org/deregistered/N13CS-1983-02-15), registration cancelled 1983-02-15, S/N 1007 (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
- Airport: Avalon Bay

## Other investigations on N11CS (3)

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 LAX79FA040](https://openairdocs.org/ntsb/LAX79FA040), Apr 14, 1979: Grumman G-21A (N11CS), Catalina Is, CA, destroyed, 1 fatal
- [NTSB LAX77FUA17](https://openairdocs.org/ntsb/LAX77FUA17), Jun 10, 1977: Grumman G-21A (N11CS), Catalina, CA, substantial damage
- [NTSB LAX72AL071](https://openairdocs.org/ntsb/LAX72AL071), Dec 12, 1971: Grumman G-21 (N11CS), Long Beach, 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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