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A B757-200 on autoland approach experienced an autoplt disconnect at 50 ft AGL just after flare capture resulting in a firm landing.
| Attributes | |
| ACN | 373771 |
| Time | |
| Date | 199706 |
| Day | Sat |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : las |
| State Reference | NV |
| Altitude | agl bound lower : 0 agl bound upper : 0 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tower : las |
| Operator | common carrier : air carrier |
| Make Model Name | B757-200 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | descent : approach landing other |
| Route In Use | arrival other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 200 flight time total : 20000 flight time type : 5000 |
| ASRS Report | 373771 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial |
| Events | |
| Anomaly | aircraft equipment problem : less severe other anomaly other other spatial deviation |
| Independent Detector | other flight crewa other other : unspecified cockpit |
| Resolutory Action | flight crew : regained aircraft control |
| Consequence | Other |
| Supplementary | |
| Air Traffic Incident | other |
Narrative:
Routine IOE, first officer flying, VFR, autoland for las runway 25L at approximately 1300 ft AGL, tower stated, air carrier xyz, land on runway 25R. First officer disconnected autoplt and lined up on runway 25R. Captain selected runway 25R on CDU, selected ILS frequency, cycled flight director switches, selected autoplt, selected approach. At 1000 ft localizer and GS captured. Aircraft on GS and localizer. No land 3 annunciated. Approach was stable. At approximately 100 ft aircraft was lined up slightly left of centerline, but acceptable. Captain called out 70 ft, 60 ft. Radar altitude announced 50 ft. Flare capture. Aircraft started to flare. Autoplt disconnected with aural warning. Aircraft bounced and started to head left. Captain took aircraft and made normal landing. Captain had aircraft inspected by maintenance. First landing was firm, but not hard. First officer flew nice autoland on next leg to lax. First officer flew nice manual landing at atl. Suspect a gust hit aircraft below 50 ft.
Original NASA ASRS Text
Title: A B757-200 ON AUTOLAND APCH EXPERIENCED AN AUTOPLT DISCONNECT AT 50 FT AGL JUST AFTER FLARE CAPTURE RESULTING IN A FIRM LNDG.
Narrative: ROUTINE IOE, FO FLYING, VFR, AUTOLAND FOR LAS RWY 25L AT APPROX 1300 FT AGL, TWR STATED, ACR XYZ, LAND ON RWY 25R. FO DISCONNECTED AUTOPLT AND LINED UP ON RWY 25R. CAPT SELECTED RWY 25R ON CDU, SELECTED ILS FREQ, CYCLED FLT DIRECTOR SWITCHES, SELECTED AUTOPLT, SELECTED APCH. AT 1000 FT LOC AND GS CAPTURED. ACFT ON GS AND LOC. NO LAND 3 ANNUNCIATED. APCH WAS STABLE. AT APPROX 100 FT ACFT WAS LINED UP SLIGHTLY L OF CTRLINE, BUT ACCEPTABLE. CAPT CALLED OUT 70 FT, 60 FT. RADAR ALT ANNOUNCED 50 FT. FLARE CAPTURE. ACFT STARTED TO FLARE. AUTOPLT DISCONNECTED WITH AURAL WARNING. ACFT BOUNCED AND STARTED TO HEAD L. CAPT TOOK ACFT AND MADE NORMAL LNDG. CAPT HAD ACFT INSPECTED BY MAINT. FIRST LNDG WAS FIRM, BUT NOT HARD. FO FLEW NICE AUTOLAND ON NEXT LEG TO LAX. FO FLEW NICE MANUAL LNDG AT ATL. SUSPECT A GUST HIT ACFT BELOW 50 FT.
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.