# NTSB OAK76FJA01: Blanik L-13, N90847, Mokuleia Oahu, HI, August 3, 1975

- Type: NTSB accident investigation
- Classification: Accident · Serious injuries · Closed
- Date: August 3, 1975
- Place: Mokuleia Oahu, HI · MOKULEIA OAHU, HI
- Phase of flight: [Uncontrolled descent](https://openairdocs.org/ntsb-phases/650) (OpenAirDocs' grouping)
- Highest injury: Serious injuries
- Injuries: 1 serious, 1 minor
- Status: Completed, report September 3, 1975
- Report: Brief approved by the director
- NTSB case key (mKey): 149686
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=OAK76FJA01
- Page: https://openairdocs.org/ntsb/OAK76FJA01

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-2150   75/8/3    MOKULEIA,OAHU,HI    BLANIK L-13         CR-  0  1  1  INSTRUCTIONAL             COMMERCIAL, FL.INSTR.,
        TIME - 1030                    N90847              PX-  0  0  0  DUAL                      AGE 39, 7560 TOTAL HOURS,
                                       DAMAGE-DESTROYED    OT-  0  0  0                            7 IN TYPE, NOT INSTRUMENT
                                                                                                   RATED.
        NAME OF AIRPORT - DILLINGHAM
        DEPARTURE POINT             INTENDED DESTINATION
          MOKULEIA,OAHU,HI            LOCAL
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           COLLISION WITH GROUND/WATER: UNCONTROLLED                IN FLIGHT: UNCONTROLLED DESCENT
        PROBABLE CAUSE(S)
           PILOT IN COMMAND - IMPROPER IN-FLIGHT DECISIONS OR PLANNING
        FACTOR(S)
           WEATHER - DOWNDRAFT,UPDRAFTS
        WEATHER BRIEFING - UNKNOWN/NOT REPORTED
        WEATHER FORECAST - UNKNOWN/NOT REPORTED
        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                  WIND DIRECTION-DEGREES
          NONE                                                      80
        WIND VELOCITY-KNOTS                                      TYPE OF WEATHER CONDITIONS
           25                                                      VFR
        TYPE OF FLIGHT PLAN
          NONE
        REMARKS- LOW ALT RIDGE SOARING.ENCOUNTERED HI SINK RATE
```

## Aircraft

- Registration: N90847 (not matched to a registry record)
- Reported make and model: BLANIK L-13
- Category: Glider
- Engines: none
- Damage: Destroyed
- Airport: Dillingham

## FAA reports on this event (1)

The FAA's own accident and incident reports, matched to the aircraft by N-number and date (OpenAirDocs).

- [Accident 19750803023129A](https://openairdocs.org/incident/19750803023129A), Aug 3, 1975: Let L13BLANIK, Mokuleia,Oahu, HI, Destroyed. Low alt ridge soaring. Encountered hi sink rate

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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