DC10 crew had unsafe indication on the right main gear.

Attributes
ACN	445431
Time
Date	199908
Day	Fri
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : sfo.airport
State Reference	CA
Altitude	msl single value : 3000
Environment
Flight Conditions	IMC
Weather Elements	Fog
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : o90.tracon
Operator	common carrier : air carrier
Make Model Name	DC-10 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	ils localizer & glide slope : 28r
Flight Phase	descent : approach
Route In Use	approach : instrument precision
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 230 flight time total : 20000 flight time type : 2500
ASRS Report	445431
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : multi engine pilot : commercial
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	other flight crewa other flight crewb
Resolutory Action	flight crew : declared emergency flight crew : executed go around flight crew : landed in emergency condition
Consequence	other
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

On approach sfo, lowered gear early due request to slow to 170 KTS. Right main gear indicated unsafe. Recycled gear, remained unsafe. Requested vectors, climbed and followed directives. At this time, fuel on board +/-43000 pounds. Declared emergency, requested vectors to holding. Instead, continued vectors. Climbed to 10000 ft to dump. During this process initially called lead flight attendant to cockpit. Briefed yellow emergency. After working expanded checklist, rebriefed lead flight attendant on possible red emergency. Contacted dispatch and maintenance -- both concurred with our decisions. Dumped to 33000 pounds. Kept gear down -- visually inspected indicator. Made approach at flaps 50 degrees (slower speed) side-stepped to runway 28L at 1000 ft (ILS inoperative on runway 28L). Flight attendants briefed and then implemented red emergency procedures on final approach. Successfully landed runway 28L (first officer) and cleared runway. Stopped clear of runway, had main gear pinned.

Original NASA ASRS Text

Title: DC10 CREW HAD UNSAFE INDICATION ON THE R MAIN GEAR.

Narrative: ON APCH SFO, LOWERED GEAR EARLY DUE REQUEST TO SLOW TO 170 KTS. R MAIN GEAR INDICATED UNSAFE. RECYCLED GEAR, REMAINED UNSAFE. REQUESTED VECTORS, CLBED AND FOLLOWED DIRECTIVES. AT THIS TIME, FUEL ON BOARD +/-43000 LBS. DECLARED EMER, REQUESTED VECTORS TO HOLDING. INSTEAD, CONTINUED VECTORS. CLBED TO 10000 FT TO DUMP. DURING THIS PROCESS INITIALLY CALLED LEAD FLT ATTENDANT TO COCKPIT. BRIEFED YELLOW EMER. AFTER WORKING EXPANDED CHKLIST, REBRIEFED LEAD FLT ATTENDANT ON POSSIBLE RED EMER. CONTACTED DISPATCH AND MAINT -- BOTH CONCURRED WITH OUR DECISIONS. DUMPED TO 33000 LBS. KEPT GEAR DOWN -- VISUALLY INSPECTED INDICATOR. MADE APCH AT FLAPS 50 DEGS (SLOWER SPD) SIDE-STEPPED TO RWY 28L AT 1000 FT (ILS INOP ON RWY 28L). FLT ATTENDANTS BRIEFED AND THEN IMPLEMENTED RED EMER PROCS ON FINAL APCH. SUCCESSFULLY LANDED RWY 28L (FO) AND CLRED RWY. STOPPED CLR OF RWY, HAD MAIN GEAR PINNED.

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.