B747-200 crew landed before the threshold of runway 26L at ont.

Attributes
ACN	562978
Time
Date	200210
Day	Tue
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : ont.airport
State Reference	CA
Altitude	agl single value : 0
Environment
Flight Conditions	Marginal
Weather Elements	other
Light	Daylight
Aircraft 1
Controlling Facilities	tower : det.tower
Operator	common carrier : air carrier
Make Model Name	B747-200
Operating Under FAR Part	Part 121
Flight Phase	landing : roll
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 : 57 flight time total : 17220 flight time type : 862
ASRS Report	562978
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 30 flight time total : 3000 flight time type : 1000
ASRS Report	563064
Events
Anomaly	aircraft equipment problem : less severe non adherence : far non adherence : company policies non adherence : published procedure other anomaly other anomaly other
Independent Detector	other flight crewa other flight crewb
Resolutory Action	none taken : detected after the fact none taken : anomaly accepted
Supplementary
Problem Areas	Flight Crew Human Performance Weather
Primary Problem	Flight Crew Human Performance

Narrative:

With 3 SM haze visibility and approximately XA00 time of the approach, elected to do an automatic-coupled ILS runway 26L approach for landing, due to limited visibility into the haze at low sunset angle. Approach speed was 147 KTS, by using the 520000 pounds data card. Captured localizer and GS normally. Crossed fonta, altitude checked at 1000 ft instruments crosschecked, no flags. At 500 ft, first officer called bug -4 KTS, sink 8 (FPM X 100). Captain stated on speed on my side, captain corrected and added power. First officer called showing 142 KTS, captain showed command speed (bug -1 (148 KTS). Captain corrected and added a little more power. First officer called approaching minimums, field in sight (prior sighting of field had occurred 2 1/2 - 3 mi out on final, but continued flying automatic coupled for proficiency). Captain disconnected autoplt at approximately 200 ft aircraft manual flying seemed normal. At approximately 100 ft, captain detected a sink and held power on. Captain let aircraft fly onto runway instead of trying to stop sink rate with excessive flare, so tail would not strike runway. Aircraft landed firmly, with main gear 45 ft short of threshold on the overrun. As nosewheel was being lowered to runway, it dropped firmly. Rest of landing rollout was normal and taxi to blocks was normal. With a 6 KT airspeed error discovered between 500 ft to 200 ft AGL and a sink rate increase detected approximately 100 ft AGL, this resulted in short landing. With the autoplt coupled versus manual flying, this might have delayed identing the aircraft flying 'behind the power curve' and adding 'more' power 'sooner.' maybe an airspeed check sooner (1000 ft AGL) during automatic coupled approachs would help prevent this situation. Supplemental information from acn 563064: ILS approach to runway 26L at ont airport, captain flying coupled ILS with autoplt. Visibility approximately 3 mi with -X haze at or near minimums, captain disconnected autoplt and flew aircraft manual to touchdown. Developed sink rate without correction. Touched down 45 ft into overrun. Airspeed indicators off by approximately 6 KTS. First officer's airspeed being the lower one as PNF did not recognize low approach till last min due to airspeed indicators off and visibility looking into sun with glare off of glare shield.

Original NASA ASRS Text

Title: B747-200 CREW LANDED BEFORE THE THRESHOLD OF RWY 26L AT ONT.

Narrative: WITH 3 SM HAZE VISIBILITY AND APPROX XA00 TIME OF THE APCH, ELECTED TO DO AN AUTO-COUPLED ILS RWY 26L APCH FOR LNDG, DUE TO LIMITED VISIBILITY INTO THE HAZE AT LOW SUNSET ANGLE. APCH SPD WAS 147 KTS, BY USING THE 520000 LBS DATA CARD. CAPTURED LOC AND GS NORMALLY. CROSSED FONTA, ALT CHKED AT 1000 FT INSTS XCHKED, NO FLAGS. AT 500 FT, FO CALLED BUG -4 KTS, SINK 8 (FPM X 100). CAPT STATED ON SPD ON MY SIDE, CAPT CORRECTED AND ADDED PWR. FO CALLED SHOWING 142 KTS, CAPT SHOWED COMMAND SPD (BUG -1 (148 KTS). CAPT CORRECTED AND ADDED A LITTLE MORE PWR. FO CALLED APCHING MINIMUMS, FIELD IN SIGHT (PRIOR SIGHTING OF FIELD HAD OCCURRED 2 1/2 - 3 MI OUT ON FINAL, BUT CONTINUED FLYING AUTO COUPLED FOR PROFICIENCY). CAPT DISCONNECTED AUTOPLT AT APPROX 200 FT ACFT MANUAL FLYING SEEMED NORMAL. AT APPROX 100 FT, CAPT DETECTED A SINK AND HELD PWR ON. CAPT LET ACFT FLY ONTO RWY INSTEAD OF TRYING TO STOP SINK RATE WITH EXCESSIVE FLARE, SO TAIL WOULD NOT STRIKE RWY. ACFT LANDED FIRMLY, WITH MAIN GEAR 45 FT SHORT OF THRESHOLD ON THE OVERRUN. AS NOSEWHEEL WAS BEING LOWERED TO RWY, IT DROPPED FIRMLY. REST OF LNDG ROLLOUT WAS NORMAL AND TAXI TO BLOCKS WAS NORMAL. WITH A 6 KT AIRSPD ERROR DISCOVERED BTWN 500 FT TO 200 FT AGL AND A SINK RATE INCREASE DETECTED APPROX 100 FT AGL, THIS RESULTED IN SHORT LNDG. WITH THE AUTOPLT COUPLED VERSUS MANUAL FLYING, THIS MIGHT HAVE DELAYED IDENTING THE ACFT FLYING 'BEHIND THE PWR CURVE' AND ADDING 'MORE' PWR 'SOONER.' MAYBE AN AIRSPD CHK SOONER (1000 FT AGL) DURING AUTO COUPLED APCHS WOULD HELP PREVENT THIS SIT. SUPPLEMENTAL INFO FROM ACN 563064: ILS APCH TO RWY 26L AT ONT ARPT, CAPT FLYING COUPLED ILS WITH AUTOPLT. VISIBILITY APPROX 3 MI WITH -X HAZE AT OR NEAR MINIMUMS, CAPT DISCONNECTED AUTOPLT AND FLEW ACFT MANUAL TO TOUCHDOWN. DEVELOPED SINK RATE WITHOUT CORRECTION. TOUCHED DOWN 45 FT INTO OVERRUN. AIRSPD INDICATORS OFF BY APPROX 6 KTS. FO'S AIRSPD BEING THE LOWER ONE AS PNF DID NOT RECOGNIZE LOW APCH TILL LAST MIN DUE TO AIRSPD INDICATORS OFF AND VISIBILITY LOOKING INTO SUN WITH GLARE OFF OF GLARE SHIELD.

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.