NTSB Identification: CHI92IA141.
The docket is stored on NTSB microfiche number 46828.
Incident occurred Thursday, May 07, 1992 in VALENTINE, NE
Probable Cause Approval Date: 06/30/1993
Aircraft: PIPER PA-23-250, registration: N143AC
Injuries: 2 Uninjured.

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

THE AIRPLANE LANDED GEAR UP DURING A COMMERCIAL AIR TAXI FLIGHT CHECK CONDUCTED BY AN FAA INSPECTOR. THE GEAR UP LANDING FOLLOWED A DISCUSSION IN THE TRAFFIC PATTERN OF THE EMERGENCY LANDING GEAR EXTENSION PROCEDURES. THE COMMERCIAL PILOT FLYING THE AIRPLANE REPORTED THAT HE PLACED THE GEAR LEVER IN THE DOWN POSITION, BUT FAILED TO CHECK FOR THE THREE GREEN LANDING GEAR DOWN LIGHTS WHICH INDICATE THE GEAR LOCKED DOWN. THE FAA INSPECTOR ALSO DOES NOT RECALL LOOKING AT THE LANDING GEAR INDICATION LIGHTS PRIOR TO LANDING. NEITHER PILOT REMEMBERS HEARING A GEAR WARNING HORN OR SEEING THE FLASHING GEAR NOT EXTENDED LIGHT IN THE LANDING GEAR SELECTOR HANDLE. POST ACCIDENT INSPECTION DISCLOSED THE GEAR LIGHT WAS OPERATING INTERMITTENTLY, AND THE GEAR WARNING HORN WOULD SOUND ONLY IF THE LEFT ENGINE THROTTLE WAS RETARDED TO THE STOP WITH CONSIDERABLE BACK PRESSURE. THE THREE GREEN GEAR LOCKED LIGHTS WORKED SATISFACTORILY.

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

THE FAILURE OF THE PILOT IN COMMAND TO EXTEND THE LANDING GEAR AND THE INATTENTIVE FAA INSPECTOR (CHECK AIRMAN). ASSOCIATED FACTORS ARE THE INOPERATIVE LANDING GEAR WARNING SYSTEM, THE INADEQUATE PREFLIGHT INSPECTION BY THE PILOT AND FAA INSPECTOR, AND THE PILOT'S FAILURE TO USE A CHECKLIST.

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