# NTSB LAX72AL071: Grumman G-21, N11CS, Long Beach, CA, December 12, 1971

- Type: NTSB accident investigation
- Classification: Accident · Minor injuries · Closed
- Date: December 12, 1971
- Place: Long Beach, CA · LONG BEACH, CA
- Location: 33.7670° N, 118.1892° W: Placed by OpenAirDocs: center of Long Beach, CA, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=33.7670&lon=-118.1892&mi=10
- Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping)
- Highest injury: Minor injuries
- Injuries: 1 minor, 3 uninjured
- Status: Completed, report August 24, 1972
- Report: Brief approved by the director
- NTSB case key (mKey): 164826
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=LAX72AL071
- Page: https://openairdocs.org/ntsb/LAX72AL071

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-4468  71/12/12   LONG BEACH,CALIF    GRUMMAN G-21        CR-  0  0  1  COMMERCIAL                AIRLINE TRANSPORT, AGE
        TIME - 1300                    N11CS               PX-  0  0  3  COMMUTER AIR CARRIER      54, 20450 TOTAL HOURS,
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0  AIR TAXI-PASSG S-D        5300 IN TYPE, INSTRUMENT
                                                                                                   RATED.
        NAME OF AIRPORT - LONG BEACH
        DEPARTURE POINT             INTENDED DESTINATION
          AVALON,CALIF                LONG BEACH,CALIF
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           GROUND-WATER LOOP-SWERVE                                 LANDING: ROLL
           GEAR COLLAPSED                                           LANDING: ROLL
        PROBABLE CAUSE(S)
           AIRFRAME - LANDING GEAR: BRAKING SYSTEM (NORMAL SYSTEM)
           MISCELLANEOUS ACTS,CONDITIONS - CORRODED/CORROSION
           PERSONNEL - MAINTENANCE,SERVICING,INSPECTION: INADEQUATE MAINTENANCE AND INSPECTION
           MISCELLANEOUS ACTS,CONDITIONS - OVERLOAD FAILURE
        FACTOR(S)
           MISCELLANEOUS ACTS,CONDITIONS - FATIGUE FRACTURE
        REMARKS- R BRAKE LOCKED,RUST ON BOTH DISCS. GR ASSY P/N 53480 HEAVILY CORRODED AND CRACKED.
```

## Aircraft

- 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-21
- Registry model: [Grumman G-21A](https://openairdocs.org/model/grumman-g-21a) (registry code 3951204) (OpenAirDocs)
- Category: Airplane
- Engines: reciprocating
- Damage: Substantial damage
- Airport: Long Beach

## 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 LAX72AL009](https://openairdocs.org/ntsb/LAX72AL009), Jul 30, 1971: Grumman G-21A (N11CS), Avalon, 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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