# NTSB CHI71IC081: Lear Jet 23, N400RB, Chicago, IL, April 28, 1971

- Type: NTSB incident investigation
- Classification: Incident · No injuries · Closed
- Date: April 28, 1971
- Place: Chicago, IL · CHICAGO, IL
- Location: 41.8500° N, 87.6501° W: Placed by OpenAirDocs: center of Chicago, IL, within about 9 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=41.8500&lon=-87.6501&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 7 uninjured
- Status: Completed, report November 3, 1971
- Report: Brief approved by the director
- NTSB case key (mKey): 161325
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CHI71IC081
- Page: https://openairdocs.org/ntsb/CHI71IC081

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
5-0005  71/4/28  NR.CHICAGO,ILL        LEAR JET 23         CR-  0  0  2  NONCOMMERCIAL             COMMERCIAL, AGE 46, 8478
        TIME - 1324                    N400RB              PX-  0  0  5  CORP/EXEC                 TOTAL HOURS, 134 IN TYPE,
                                       DAMAGE-MINOR        OT-  0  0  0                            INSTRUMENT RATED.
        CLASSIFIED AS INCIDENT
        DEPARTURE POINT             INTENDED DESTINATION
         CHICAGO,ILL                  MADISONVILLE,KY
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           COLLIDED WITH: TREES                                     IN FLIGHT: OTHER
        PROBABLE CAUSE(S)
           PILOT IN COMMAND - IMPROPER OPERATION OF FLIGHT CONTROLS
           PILOT IN COMMAND - SPATIAL DISORIENTATION
        FACTOR(S)
           PILOT IN COMMAND - FAILED TO USE OR INCORRECTLY USED MISC.EQUIPMENT
        EMERGENCY CIRCUMSTANCES - PRECAUTIONARY LANDING ON AIRPORT
                                  SUSPECTED OR KNOWN AIRCRAFT DAMAGE
        REMARKS- RECD CLIMB CLNC.ENTERED OCST,LOST CTL.PITCH TRIM SWITCH INADVERTENTLY POS OFF.HIT TREE ON PULL OUT
```

## Aircraft

- Registration: N400RB (not matched to a registry record)
- Reported make and model: LEAR JET 23
- Category: Airplane
- Engines: turbo jet
- Damage: Minor 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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