# NTSB CHI71FBD49: Yankee AA1, N5686L, Crystal Lake, IL, January 9, 1971

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Closed
- Date: January 9, 1971
- Place: Crystal Lake, IL · CRYSTAL LAKE, IL
- Location: 42.2332° N, 88.3344° W: Placed by OpenAirDocs: center of Crystal Lake, IL, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=42.2332&lon=-88.3344&mi=10
- Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed, report November 24, 1971
- Report: Brief approved by the director
- NTSB case key (mKey): 159977
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CHI71FBD49
- Page: https://openairdocs.org/ntsb/CHI71FBD49

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-0465   71/1/9    CRYSTAL LAKE,ILL    YANKEE AA1          CR-  0  0  1  NONCOMMERCIAL             PRIVATE, AGE 27, 230
        TIME - 1200                    N5686L              PX-  0  0  0  PLEASURE/PERSONAL TRANSP  TOTAL HOURS, 165 IN TYPE,
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            INSTRUMENT RATED.
        NAME OF AIRPORT - CRYSTAL LAKE
        DEPARTURE POINT             INTENDED DESTINATION
          WEST CHICAGO,ILL            CRYSTAL LAKE,ILL
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           HARD LANDING                                             LANDING: LEVEL OFF/TOUCHDOWN
           NOSE OVER/DOWN                                           LANDING: ROLL
        PROBABLE CAUSE(S)
           PILOT IN COMMAND - IMPROPER LEVEL OFF
           PILOT IN COMMAND - IMPROPER RECOVERY FROM BOUNCED LANDING
        FACTOR(S)
           WEATHER - UNFAVORABLE WIND CONDITIONS
        WEATHER BRIEFING - BRIEFED BY FLIGHT SERVICE PERSONNEL, IN PERSON
        WEATHER FORECAST - FORECAST SUBSTANTIALLY CORRECT
        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                  RELATIVE BEARING OF WIND
          NONE                                                     LEFT CROSS WIND 248-292 DEGREES
        WIND DIRECTION-DEGREES                                   WIND VELOCITY-KNOTS
          180                                                       20
        TYPE OF WEATHER CONDITIONS                               TYPE OF FLIGHT PLAN
          VFR                                                      IFR
        REMARKS- WIND GUSTING 20K.
```

## Aircraft

- Registration: [N5686L](https://openairdocs.org/aircraft/N5686L), registered now, S/N AA1-0086, built 1969 (OpenAirDocs)
- Reported make and model: YANKEE AA1
- Registry model: [American AA-1](https://openairdocs.org/model/american-aa-1) (registry code 0630610) (OpenAirDocs)
- Registry engine: [Lycoming 0-235 series](https://openairdocs.org/engine/lycoming-0-235-series) (registry code 41505, 4 cycle) (OpenAirDocs)
- Category: Airplane
- Engines: reciprocating
- Damage: Substantial damage
- Airport: Crystal Lake

## Other investigations on N5686L (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 NYC83LA223](https://openairdocs.org/ntsb/NYC83LA223), Aug 24, 1983: American AA-1 (N5686L), Dunkirk, NY, substantial 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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