# NTSB OAK74AP006: Cessna 310A, N135Z, Chester, CA, August 2, 1973 - Type: NTSB accident investigation - Classification: Accident · Fatal · Closed - Date: August 2, 1973 - Place: Chester, CA · CHESTER, CA - Location: 40.3017° N, 121.2325° W: Placed by OpenAirDocs: center of Chester, CA, within about 6 miles (OpenAirDocs) - Nearby events: https://openairdocs.org/map.md?lat=40.3017&lon=-121.2325&mi=10 - Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping) - Highest injury: Fatal - Injuries: 1 fatal, 1 uninjured - Status: Completed, report October 16, 1973 - Report: Brief approved by the director - NTSB case key (mKey): 189190 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=OAK74AP006 - Page: https://openairdocs.org/ntsb/OAK74AP006 ## NTSB brief (aircraft 2) ``` ----------------------------------------------------------------------------------------------------------------------------  FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA                                                                F  S M/N     PURPOSE ---------------------------------------------------------------------------------------------------------------------------- 3-2421   73/8/2  NR.CHESTER,CALIF      GRUMMAN TBM-3       CR-  1  0  0  COMMERCIAL                COMMERCIAL, FL.INSTR.,         TIME - 1515                    N9083Z              PX-  0  0  0  FIRE CONTROL              AGE 47, 3975 TOTAL HOURS,                                        DAMAGE-DESTROYED    OT-  0  0  1                            450 IN TYPE, INSTRUMENT                                                                                                    RATED.         DEPARTURE POINT             INTENDED DESTINATION          CHESTER,CALIF                LOCAL         TYPE OF ACCIDENT                                         PHASE OF OPERATION            COLLISION WITH AIRCRAFT: BOTH IN FLIGHT                  IN FLIGHT: SWATH RUN         PROBABLE CAUSE(S)            PERSONNEL - MISCELLANEOUS-PERSONNEL: PILOT OF OTHER AIRCRAFT         FACTOR(S)            WEATHER - OBSTRUCTIONS TO VISION         WEATHER BRIEFING - NO RECORD OF BRIEFING RECEIVED         WEATHER FORECAST - FORECAST SUBSTANTIALLY CORRECT         SKY CONDITION                                            CEILING AT ACCIDENT SITE           SCATTERED                                                UNLIMITED         VISIBILITY AT ACCIDENT SITE                              PRECIPITATION AT ACCIDENT SITE           1 MILE OR LESS                                           NONE         OBSTRUCTIONS TO VISION AT ACCIDENT SITE                  TEMPERATURE-F           SMOKE                                                     93         WIND DIRECTION-DEGREES                                   WIND VELOCITY-KNOTS           180                                                       5         TYPE OF WEATHER CONDITIONS                               TYPE OF FLIGHT PLAN           VFR                                                      NONE          SPECIAL DATA           SEGMENTS OF AVIATION INVOLVED - SMALL US GEN.AV.-LARGE US GEN.AV.           CONTROLLING AGENCY - NO CONTROL                          RADAR CTL/SURVEILLANCE - RADAR SERVICE NOT AVAILABLE           TRAFFIC ADVISORY ISSUED - NONE                           CONTROL ZONE/AREA - NO           EVASIVE ACTION TAKEN - NO         REMARKS- 2ND TANKER IN 3 SHIP TRAIL FORMATION LED BY SPOTTER.DROP RUN BRIEF TRNSMT TO TANKERS PRIOR TO RUN. ``` ## NTSB brief (aircraft 1) ``` ----------------------------------------------------------------------------------------------------------------------------  FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA                                                                F  S M/N     PURPOSE ---------------------------------------------------------------------------------------------------------------------------- 3-2421   73/8/2  NR.CHESTER,CALIF      CESSNA 310A         CR-  0  0  1  COMMERCIAL                COMMERCIAL, AGE 53, 13028         TIME - 1515                    N135Z               PX-  0  0  0  FIRE CONTROL              TOTAL HOURS, 350 IN TYPE,                                        DAMAGE-SUBSTANTIAL  OT-  1  0  0                            INSTRUMENT RATED.         DEPARTURE POINT             INTENDED DESTINATION           REDDING,CALIF               LOCAL         TYPE OF ACCIDENT                                         PHASE OF OPERATION            COLLISION WITH AIRCRAFT: BOTH IN FLIGHT                  IN FLIGHT: OTHER         PROBABLE CAUSE(S)            PILOT IN COMMAND - FAILED TO SEE AND AVOID OTHER AIRCRAFT         FACTOR(S)            PILOT IN COMMAND - FAILED TO FOLLOW APPROVED PROCEDURES,DIRECTIVES,ETC.            PILOT IN COMMAND - DIVERTED ATTENTION FROM OPERATION OF AIRCRAFT            WEATHER - OBSTRUCTIONS TO VISION         WEATHER BRIEFING - NO RECORD OF BRIEFING RECEIVED         WEATHER FORECAST - FORECAST SUBSTANTIALLY CORRECT         SKY CONDITION                                            CEILING AT ACCIDENT SITE           SCATTERED                                                UNLIMITED         VISIBILITY AT ACCIDENT SITE                              PRECIPITATION AT ACCIDENT SITE           1 MILE OR LESS                                           NONE         OBSTRUCTIONS TO VISION AT ACCIDENT SITE                  TEMPERATURE-F           SMOKE                                                     93         WIND DIRECTION-DEGREES                                   WIND VELOCITY-KNOTS           180                                                       5         TYPE OF WEATHER CONDITIONS                               TYPE OF FLIGHT PLAN           VFR                                                      NONE          SPECIAL DATA           SEGMENTS OF AVIATION INVOLVED - SMALL US GEN.AV.-LARGE US GEN.AV.           CONTROLLING AGENCY - NO CONTROL                          RADAR CTL/SURVEILLANCE - RADAR SERVICE NOT AVAILABLE           TRAFFIC ADVISORY ISSUED - NONE                           CONTROL ZONE/AREA - NO           EVASIVE ACTION TAKEN - UNKNOWN/NOT REPORTED         REMARKS- SPOTTED FIRE ZONE FOR TANKERS.ENTERED STEEP CLIMBING TURN,DSCND IN TURN & STRUCK TBM ON DROP RUN. ``` ## Aircraft 1 - Registration: [N135Z](https://openairdocs.org/deregistered/N135Z-1973-11-23), registration cancelled 1973-11-23, S/N 38144 (OpenAirDocs) - Reported make and model: CESSNA 310A - Registry model: [Cessna 310](https://openairdocs.org/model/cessna-310) (registry code 2074202) (OpenAirDocs) - Category: Airplane - Engines: reciprocating - Damage: Substantial damage ## Aircraft 2 - Registration: [N9083Z](https://openairdocs.org/deregistered/N9083Z-1973-11-15), registration cancelled 1973-11-15, S/N 53492 (OpenAirDocs) - Reported make and model: GRUMMAN TBM-3 - Registry model: [Grumman TBM-3](https://openairdocs.org/model/grumman-tbm-3) (registry code 3950308) (OpenAirDocs) - Category: Airplane - Engines: reciprocating - Damage: Destroyed ## FAA reports on this event (2) The FAA's own accident and incident reports, matched to the aircraft by N-number and date (OpenAirDocs). - [Accident 19730802031401A](https://openairdocs.org/incident/19730802031401A), Aug 2, 1973: Cessna T310R, Chester, CA, Substantial damage. Spotted fire zone for tankers. Entered steep climbing turn,dscnd in turn & struck tbm on drop run. - [Accident 19730802031402A](https://openairdocs.org/incident/19730802031402A), Aug 2, 1973: Gruman TBM3AIRTRD, Chester, CA, Destroyed. 2Nd tanker in 3 ship trail formation led by spotter. Drop run brief trnsmt to tankers prior to run. 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.