# Incident 19940114004339I: Gulstm 500B, Milwaukee, WI, January 14, 1994

- Type: FAA incident report (Accident/Incident Data System), as reported
- Date: January 14, 1994, 18:30 local time
- Place: Milwaukee, WI
- Airport: General Mitchell Field
- Phase of flight: Normal Cruise
- Operating rules: General operating rules (Part 91)
- Location: 42.9469° N, 87.8971° W: Placed by OpenAirDocs at GENERAL MITCHELL INTL (MKE), within about a mile (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=42.9469&lon=-87.8971&mi=10
- Aircraft: N801K, registered now (https://openairdocs.org/aircraft/N801K) (OpenAirDocs)
- Registry model: Aero Commander 500-B (registry code 0141106, https://openairdocs.org/model/aero-commander-500-b) (OpenAirDocs)
- Registry engine: Lycoming TI0-540 series (registry code 41533, https://openairdocs.org/engine/lycoming-ti0-540-series) (OpenAirDocs)
- Reported make and model: GULSTM 500B
- Reported engine: LYC IO540E1B5
- People aboard: 2
- Fatal injuries: 0
- Pilot flight hours: 12,200 total, 40 in this make and model, 25 in the last 90 days
- FAA source: FAA Aviation Safety Information Portal (https://asip.faa.gov/)
- Page: https://openairdocs.org/incident/19940114004339I

## Narrative

As the FAA filed it, in capitals; the FAA replaces private details with ^PRIVACY DATA OMITTED^.

NARRATIVE: ON JANUARY 14, 1994, AERO COMMANDER 500B, N801K, DEPARTED CLARKSVILLE, TN ON AN IFR FLIGHT PLAN TO MILWAUKEE, WI. AT APPROXIMATELY 1830 PM, WHILE ENROUTE AT AN ALTITUDE OF 9,000 FEET, THE PILOT IN COMMAND OBSERVED A RISE IN OIL PRESSURE BEYOND THE RED LINE OF THE LEFT ENGINE. VISUAL METEROLOGICAL CONDITIONS PREVAILED AT THIS TIME, THE OUTSIDE AIR TEMPERATURE WAS -15 DEGREES F, AND THIRTY MINUTES PREVIOIUS TO THIS, THE AIRCRAFT HAD FLOWN THROUGH VISIBLE MOISTURE FOR APPROXIMATELY 5 TO 7 MINUTES. POWER ON THIS ENGINE WAS REDUCED TO 18-20 INCHES OF MAP FOLLOWED SHORTLY THEREAFTER BY AN ABRUPT DROP OF THIS PRESSURE. THE LEFT ENGINE WAS SHUT DOWN, PROPELLER FEATHERED, ASSISTANCE FROM CHICAGO ATC CENTER REQUESTED FOR VECTORS TO MILWAUKEE, AND AN UNEVENTFUL LANDING WAS ACCOMPLISHED AT GENERAL MITCHELL INTERNATIONAL AIRPORT. INSPECTION OF THIS AIRCRAFT REVEALED THE LEFT ENGINE PROPELLER FLANGE SEAL HAD RUPTURED AT THE THREE O'CLOCK POSITION ALLOWING ENGINE OIL TO ESCAPE. BASED UPON THE EXTREMELY COLD TEMPERATURES AT THE TIME OF THIS INCIDENT AND THE TYPE OF FAILURE ENCOUNTERED, ^PRIVACY DATA OMITTED^ A MALFUNCTION OR DEFECT REPORT TO BE SUBMITTED BY THE MECHANIC PERFORMING THE REPAIR.

From the FAA Accident/Incident Data System. Reports are matched to registry aircraft by N-number and event date, checked against the reported make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model. For accidents, the NTSB's own investigation is the fuller record.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.