NTSB Identification: DEN87IA032.
The docket is stored on NTSB microfiche number 33009.
Scheduled 14 CFR
Incident occurred Friday, December 19, 1986 in BILLINGS, MT
Aircraft: SWEARINGEN SA226TC, registration: N124AV
Injuries: 13 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.

N124AV WAS OPERATING AS BIG SKY AIRLINES FLT 3857, SCHEDULED SERVICE FROM HELENA TO BILLINGS. THE FLT PROCEEDED UNEVENTFULLY UNTIL THE APCH INTO BILLINGS. THE FLT CREW STATED AFTER THE INCIDENT THAT WHEN THE LANDING GEAR WAS EXTENDED, THE LEFT MAIN GEAR LIGHTS DID NOT ILLUMINATE, VERIFYING THE 'DOWN AND LOCKED POSITION..' AFTER NUMEROUS ATTEMPTS TO ILLUMINATE THE LIGHTS AND CONFIRM THE POSITION OF THE LANDING GEAR, THE CREW EXECUTED AN INTENTIONAL GEAR UP LANDING. POST INCIDENT INSPECTION OF THE LANDING GEAR SYSTEM REVEALED IT WAS CAPABLE OF NORMAL OPERATION. THE MALFUNCTIONING COCKPIT INDICATOR LIGHT WAS TRACED BACK TO AN INOPERATIVE OUTBOARD DOWNLOCK MICROSWITCH.

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

REMEDIAL ACTION..IMPROPER..PILOT IN COMMAND

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

WHEELS UP LANDING..INTENTIONAL..PILOT IN COMMAND


Contributing Factors

LANDING GEAR,GEAR INDICATING SYSTEM..FAILURE,PARTIAL

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