# NTSB SEA71AS040: Lear Jet 24D, Butte, MT, April 17, 1971

- Type: NTSB accident investigation
- Date: April 17, 1971
- Place: Butte, MT · BUTTE, MT
- Location: 46.0038° N, 112.5347° W: Placed by OpenAirDocs: center of Butte, MT, within about 6 miles (OpenAirDocs)
- Highest injury: Fatal
- Injuries: 4 fatal
- Status: Completed
- Report: DirectorBrief, August 2, 1971
- NTSB case key (mKey): 160356
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=SEA71AS040
- Page: https://openairdocs.org/ntsb/SEA71AS040

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-0059  71/4/17  NR.BUTTE,MONT         LEAR JET 24D        CR-  2  0  0  NONCOMMERCIAL             COMMERCIAL, FL.INSTR.,
        TIME - 1615                    N123CB              PX-  2  0  0  PLEASURE/PERSONAL TRANSP  AGE 26, 768 TOTAL HOURS,
                                       DAMAGE-DESTROYED    OT-  0  0  0                            147 IN TYPE, INSTRUMENT
                                                                                                   RATED.
        DEPARTURE POINT             INTENDED DESTINATION
          POLSON,MONT                 BUTTE,MONT
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           COLLISION WITH GROUND/WATER: CONTROLLED                  LANDING: FINAL APPROACH
        PROBABLE CAUSE(S)
           PILOT IN COMMAND - IMPROPER IFR OPERATION
        FACTOR(S)
           WEATHER - OTHER
        WEATHER BRIEFING - NO RECORD OF BRIEFING RECEIVED
        WEATHER FORECAST - UNKNOWN/NOT REPORTED
        MISSING AIRCRAFT - LATER RECOVERED
        SKY CONDITION                                            CEILING AT ACCIDENT SITE
          OBSCURATION                                               0
        VISIBILITY AT ACCIDENT SITE                              PRECIPITATION AT ACCIDENT SITE
          ZERO                                                     RAIN
        OBSTRUCTIONS TO VISION AT ACCIDENT SITE                  TEMPERATURE-F
          FOG                                                       37
        WIND DIRECTION-DEGREES                                   WIND VELOCITY-KNOTS
          340                                                       6
        TYPE OF WEATHER CONDITIONS                               TYPE OF FLIGHT PLAN
          BELOW MINIMUMS                                           IFR
         FIRE AFTER IMPACT
        REMARKS- HIT MTN,6060FT MSL,APRX 1.6NM FRM VOR,PUBL ALT ABT 8000FT.MTNS OBSC.ARPT BLO MINS.ACFT RCVRD 4/19.
```

## Sequence of events

- Approach

## Aircraft

- Registration: N123CB, a cancelled registration (https://openairdocs.org/deregistered/N123CB-1971-08-03) (OpenAirDocs)
- Reported make and model: LEAR JET 24D
- Registry model: Learjet 24D (registry code 5170310, https://openairdocs.org/model/learjet-24d) (OpenAirDocs)
- Category: Airplane
- Damage: Destroyed

From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

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From OpenAirDocs.org, an independent open copy of NTSB and FAA data. The NTSB's own report is the official record of an investigation.