# NTSB CHI81FEE48: Porterfield 35-70, N17029, Rockford, IL, August 5, 1981

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Closed
- Date: August 5, 1981
- Place: Rockford, IL · ROCKFORD, IL
- Location: 42.2711° N, 89.0940° W: Placed by OpenAirDocs: center of Rockford, IL, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=42.2711&lon=-89.0940&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 2 uninjured
- Status: Completed, report September 9, 1981
- Report: Brief approved by the director
- NTSB case key (mKey): 125094
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CHI81FEE48
- Page: https://openairdocs.org/ntsb/CHI81FEE48

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-1657   81/8/5  NR.ROCKFORD,IL        PORTERFIELD 35-70   CR-  0  0  1  NONCOMMERCIAL             PRIVATE, AGE 67, 3400
        TIME - 0930                    N17029              PX-  0  0  1  PLEASURE/PERSONAL TRANSP  TOTAL HOURS, 500 IN TYPE,
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            NOT INSTRUMENT RATED.
        DEPARTURE POINT             INTENDED DESTINATION
          STERLING,IL                 OSHKOSH,WI
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           ENGINE FAILURE OR MALFUNCTION                            IN FLIGHT: NORMAL CRUISE
           COLLIDED WITH: OBJECT                                    LANDING: ROLL
        PROBABLE CAUSE(S)
           POWERPLANT - ENGINE STRUCTURE: VALVE ASSEMBLIES
           MISCELLANEOUS ACTS,CONDITIONS - MATERIAL FAILURE
           PILOT IN COMMAND - FAILED TO SEE AND AVOID OBJECTS OR OBSTRUCTIONS
        FACTOR(S)
           MISCELLANEOUS ACTS,CONDITIONS - SEPARATION IN FLIGHT
        PARTIAL POWER LOSS - PARTIAL LOSS OF POWER - 1 ENGINE
        EMERGENCY CIRCUMSTANCES - PRECAUTIONARY LANDING OFF AIRPORT
        REMARKS- NO 5 INTAKE PUSHROD FAILED & DEPD ACFT.
```

## Aircraft

- Registration: [N17029](https://openairdocs.org/aircraft/N17029), registered now, S/N 229, built 1936 (OpenAirDocs)
- Reported make and model: PORTERFIELD 35-70
- Registry model: [Porterfield 35-70](https://openairdocs.org/model/porterfield-35-70) (registry code 6480104) (OpenAirDocs)
- Registry engine: [Leblond 70 series](https://openairdocs.org/engine/leblond-70-series) (registry code 39101, reciprocating) (OpenAirDocs)
- Category: Airplane
- Engines: reciprocating
- Damage: Substantial damage

## 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 19810805047719A](https://openairdocs.org/incident/19810805047719A), Aug 5, 1981: Norwst 3570PORTFLD, Rockford, IL, Substantial damage. Rough engine. Elected landing on a road to check engine. Hit sign-post on roll-out. Found intake push rod missing.

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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