# NTSB OAK73AP001: Champion 7KCAB, N5136X, San Ramon, CA, July 8, 1972

- Type: NTSB accident investigation
- Classification: Accident · Fatal · Closed
- Date: July 8, 1972
- Place: San Ramon, CA · SAN RAMON, CA
- Location: 37.7666° N, 121.9292° W: Placed by OpenAirDocs: center of San Ramon, CA, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=37.7666&lon=-121.9292&mi=10
- Phase of flight: [Maneuvering](https://openairdocs.org/ntsb-phases/450) (OpenAirDocs' grouping)
- Highest injury: Fatal
- Injuries: 2 fatal
- Status: Completed, report March 10, 1973
- Report: Brief approved by the director
- NTSB case key (mKey): 167211
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=OAK73AP001
- Page: https://openairdocs.org/ntsb/OAK73AP001

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-2888   72/7/8    SAN RAMON,CALIF     CHAMPION 7KCAB      CR-  2  0  0  INSTRUCTIONAL             COMMERCIAL, FL.INSTR.,
        TIME - 1530                    N5136X              PX-  0  0  0  DUAL                      AGE 30, 974 TOTAL HOURS,
                                       DAMAGE-DESTROYED    OT-  0  0  0                            185 IN TYPE, INSTRUMENT
                                                                                                   RATED.
        DEPARTURE POINT             INTENDED DESTINATION
          OAKLAND,CALIF               LOCAL
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           STALL: SPIN                                              IN FLIGHT: ACROBATICS
        PROBABLE CAUSE(S)
           PILOT IN COMMAND - INADEQUATE PREFLIGHT PREPARATION AND/OR PLANNING
           MISCELLANEOUS ACTS,CONDITIONS - INTERFERENCE WITH FLIGHT CONTROLS
           MISCELLANEOUS ACTS,CONDITIONS - UNWARRANTED LOW FLYING
        FACTOR(S)
           MISCELLANEOUS ACTS,CONDITIONS - SEAT BELT NOT FASTENED
           MISCELLANEOUS ACTS,CONDITIONS - IMPROPERLY LOADED AIRCRAFT-WEIGHT-AND/OR C.G.
        REMARKS- IP SEAT BELT NOT FASTENED. OVER MAX GROSS WT AT T/O ABOUT 150 LBS. AFT CG. LOW LEVEL AEROBATICS.
```

## Aircraft

- Registration: [N5136X](https://openairdocs.org/deregistered/N5136X-1973-06-25), registration cancelled 1973-06-25, S/N 173 (OpenAirDocs)
- Reported make and model: CHAMPION 7KCAB
- Registry model: [Champion 7KCAB](https://openairdocs.org/model/champion-7kcab) (registry code 21101P3) (OpenAirDocs)
- Category: Airplane
- Engines: reciprocating
- Damage: Destroyed

## Other investigations on N5136X (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 OAK71AP048](https://openairdocs.org/ntsb/OAK71AP048), May 28, 1971: Champion 7KCAB (N5136X), Antioch, CA, destroyed, 2 fatal

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.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.