NTSB Identification: CHI94LA130.
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Accident occurred Monday, April 11, 1994 in CHESTERFIELD, MO
Probable Cause Approval Date: 06/05/1995
Aircraft: CESSNA 182P, registration: N9187M
Injuries: 1 Serious.

NTSB investigators may not have traveled in support of this investigation and used data provided by various sources to prepare this aircraft accident report.

BEFORE FLIGHT, THE PILOT WAS TOLD THE ILS GLIDESLOPE FOR RUNWAY 8R AT THE DESTINATION (SUS) WAS OUT OF SERVICE. DURING A NIGHT ARRIVAL, THE APPROACH CONTROLLER (APCH CTLR) ASKED IF HE WANTED AN IFR CLEARANCE; HE SAID HE DID. THE CTLR PROVIDED VECTORS FOR AN ILS 8 RIGHT APCH, BUT CLEARED THE PILOT FOR THE APCH WITHOUT ADVISING THAT THE GLIDESLOPE WAS OUT OF SERVICE. ALSO, THE CTLR DID NOT ASSIGN AN IFR CODE, SO THE LOW ALTITUDE ALERT SYSTEM WAS NOT ACTIVATED. THE PILOT FLEW THRU THE LOCALIZER (LOC) COURSE, THEN SAID HE WAS NOT RECEIVING THE LOC. THE APCH CTLR ASKED THE TOWER IF THE LOC WAS OPERATIONAL & WAS TOLD 'IT WAS IN ALARM BUT THE LOCALIZER IS UP NOW.' THE PILOT WAS REVECTORED FOR THE APCH, THEN SAID HE WAS RECEIVING THE LOC. HE WAS CLEARED AGAIN FOR THE ILS. DURING THE APCH, N9187M DESCENDED BELOW THE LOC-ONLY MINIMUM DESCENT ALTITUDE (1020') & ILS DECISION HEIGHT (662'). SUBSEQUENTLY, THE AIRPLANE HIT TREES ON AN ISLAND IN A RIVER, 2.5 MI WEST OF THE AIRPORT. THE RIVER WAS BELOW THE AIRPORT ELEVATION OF 463'.

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

FAILURE OF THE PILOT TO FOLLOW PROPER IFR PROCEDURES AND MAINTAIN PROPER ALTITUDE DURING THE APPROACH. FACTORS RELATED TO THE ACCIDENT WERE: DARKNESS, THE WEATHER CONDITIONS, AND FAILURE OF THE APPROACH CONTROLLER TO ISSUE AN IFR TRANSPONDER CODE TO THE AIRCRAFT WHEN HE PROVIDED THE IFR CLEARANCE, WHICH WOULD HAVE ALLOWED A LOW ALTITUDE ALERT TO BE TRIGGERED.

Full narrative available

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