An EMB120 aircraft on approach to mco, fl, reports the landing gear fails to extend. The aircraft executes a missed approach and extends the landing gear with an alternate system and lands uneventfully.

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Attributes
ACN	388366
Time
Date	199712
Day	Mon
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : mco
State Reference	FL
Altitude	msl bound lower : 2000 msl bound upper : 2000
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : mco
Operator	common carrier : air carrier
Make Model Name	Brasilia EMB-120 All Series
Operating Under FAR Part	Part 121
Navigation In Use	Other
Flight Phase	descent : approach landing other
Route In Use	approach : straight in
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : instrument pilot : atp
Experience	flight time last 90 days : 265 flight time total : 20000 flight time type : 6000
ASRS Report	388366
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : overcame equipment problem
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

During ILS approach to orlando international airport ILS runway 36R, the landing gear failed to extend when the gear selector handle was positioned 'down.' orlando approach was advised and a missed approach was executed with radar vector to the west. The landing gear emergency extension procedures were called for by the captain (the PF). The first officer complied by following the procedures contained in the airline's flight standards manual. An 'electrical override' extension of the gear was satisfactorily executed. Orlando approach control was advised that a safe gear down was confirmed, and a request for approach was initiated. A normal ILS approach and safe landing was completed. No emergency was declared by the crew. No emergency vehicles were dispatched by FAA ATC personnel. CRM procedures were followed during the situation and greatly effected a calm and well executed response by the crew. A gear proximity switch failure is believed to have caused the problem.

Original NASA ASRS Text

Title: AN EMB120 ACFT ON APCH TO MCO, FL, RPTS THE LNDG GEAR FAILS TO EXTEND. THE ACFT EXECUTES A MISSED APCH AND EXTENDS THE LNDG GEAR WITH AN ALTERNATE SYS AND LANDS UNEVENTFULLY.

Narrative: DURING ILS APCH TO ORLANDO INTL ARPT ILS RWY 36R, THE LNDG GEAR FAILED TO EXTEND WHEN THE GEAR SELECTOR HANDLE WAS POSITIONED 'DOWN.' ORLANDO APCH WAS ADVISED AND A MISSED APCH WAS EXECUTED WITH RADAR VECTOR TO THE W. THE LNDG GEAR EMER EXTENSION PROCS WERE CALLED FOR BY THE CAPT (THE PF). THE FO COMPLIED BY FOLLOWING THE PROCS CONTAINED IN THE AIRLINE'S FLT STANDARDS MANUAL. AN 'ELECTRICAL OVERRIDE' EXTENSION OF THE GEAR WAS SATISFACTORILY EXECUTED. ORLANDO APCH CTL WAS ADVISED THAT A SAFE GEAR DOWN WAS CONFIRMED, AND A REQUEST FOR APCH WAS INITIATED. A NORMAL ILS APCH AND SAFE LNDG WAS COMPLETED. NO EMER WAS DECLARED BY THE CREW. NO EMER VEHICLES WERE DISPATCHED BY FAA ATC PERSONNEL. CRM PROCS WERE FOLLOWED DURING THE SIT AND GREATLY EFFECTED A CALM AND WELL EXECUTED RESPONSE BY THE CREW. A GEAR PROX SWITCH FAILURE IS BELIEVED TO HAVE CAUSED THE PROB.

Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.