Unsafe gear indication on approach.

Attributes
ACN	293650
Time
Date	199501
Day	Thu
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : pit
State Reference	PA
Altitude	agl bound lower : 1000 agl bound upper : 3000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : pit tracon : n90
Operator	common carrier : air carrier
Make Model Name	DC-9 10
Operating Under FAR Part	Part 121
Flight Phase	descent : approach landing : go around landing other
Route In Use	approach : visual
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : flight engineer
Experience	flight time last 90 days : 200 flight time total : 9500 flight time type : 2500
ASRS Report	293650
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	other flight crewa
Resolutory Action	flight crew : overcame equipment problem other
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

On final for visual approach runway 28R pit, lowered gear at normal confign point and did not get a green gear down light for right main gear. Left main gear and nose gear green lights were illuminated. No red gear unsafe lights were illuminated. Sequence of gear lights appeared normal during extension. Executed go around to analyze situation and run checklists. Tower noted that all gear appeared to be normally extended. We had plenty of fuel and the WX was excellent. We stayed configured at gear down and 20 degrees flaps and were vectored by approach control as we ran all appropriate checklists the first officer confirmed the right main gear was in the down and locked position through the periscope viewer. Accomplishing all checklist procedures resulted in no changes to aircraft status. Dispatch was notified. As a precaution I advised our lead flight attendant to brief the passenger on emergency landing procedure and asked the tower to have the emergency vehicles standing by. The aircraft was fully configured for landing. The subsequent approach touchdown and rollout were uneventful. After clearing the runway at the high speed turnoff, the response team pinned the gear and we taxied to the gate without incident. All crew members performed their duties in an outstanding, professional manner. There were no passenger complaints we were aware of, and numerous compliments were heard from the passenger. A sensing malfunction of some type was suspected.

Original NASA ASRS Text

Title: UNSAFE GEAR INDICATION ON APCH.

Narrative: ON FINAL FOR VISUAL APCH RWY 28R PIT, LOWERED GEAR AT NORMAL CONFIGN POINT AND DID NOT GET A GREEN GEAR DOWN LIGHT FOR R MAIN GEAR. L MAIN GEAR AND NOSE GEAR GREEN LIGHTS WERE ILLUMINATED. NO RED GEAR UNSAFE LIGHTS WERE ILLUMINATED. SEQUENCE OF GEAR LIGHTS APPEARED NORMAL DURING EXTENSION. EXECUTED GAR TO ANALYZE SIT AND RUN CHKLISTS. TWR NOTED THAT ALL GEAR APPEARED TO BE NORMALLY EXTENDED. WE HAD PLENTY OF FUEL AND THE WX WAS EXCELLENT. WE STAYED CONFIGURED AT GEAR DOWN AND 20 DEGS FLAPS AND WERE VECTORED BY APCH CTL AS WE RAN ALL APPROPRIATE CHKLISTS THE FO CONFIRMED THE R MAIN GEAR WAS IN THE DOWN AND LOCKED POS THROUGH THE PERISCOPE VIEWER. ACCOMPLISHING ALL CHKLIST PROCS RESULTED IN NO CHANGES TO ACFT STATUS. DISPATCH WAS NOTIFIED. AS A PRECAUTION I ADVISED OUR LEAD FLT ATTENDANT TO BRIEF THE PAX ON EMER LNDG PROC AND ASKED THE TWR TO HAVE THE EMER VEHICLES STANDING BY. THE ACFT WAS FULLY CONFIGURED FOR LNDG. THE SUBSEQUENT APCH TOUCHDOWN AND ROLLOUT WERE UNEVENTFUL. AFTER CLRING THE RWY AT THE HIGH SPD TURNOFF, THE RESPONSE TEAM PINNED THE GEAR AND WE TAXIED TO THE GATE WITHOUT INCIDENT. ALL CREW MEMBERS PERFORMED THEIR DUTIES IN AN OUTSTANDING, PROFESSIONAL MANNER. THERE WERE NO PAX COMPLAINTS WE WERE AWARE OF, AND NUMEROUS COMPLIMENTS WERE HEARD FROM THE PAX. A SENSING MALFUNCTION OF SOME TYPE WAS SUSPECTED.

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.