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A B747 PIC cites a heavier than planned landing weight on the hard landing that followed his ILS approach into position, first officer.
| Attributes | |
| ACN | 393440 |
| Time | |
| Date | 199802 |
| Day | Thu |
| Local Time Of Day | 0001 To 0600 |
| Place | |
| Locale Reference | airport : pos |
| State Reference | FO |
| Altitude | agl bound lower : 0 agl bound upper : 0 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B747 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other |
| Flight Phase | descent : approach landing other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : cfi pilot : atp pilot : flight engineer |
| Experience | flight time last 90 days : 50 flight time total : 18500 flight time type : 3000 |
| ASRS Report | 393440 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument |
| Events | |
| Anomaly | conflict : ground critical non adherence : far non adherence other other anomaly other anomaly other |
| Independent Detector | other flight crewa |
| Resolutory Action | none taken : unable |
| Consequence | other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation other |
Narrative:
Landing with aircraft near maximum landing weight in VFR conditions, light winds. Used ILS facilities for approach and landing. Noted when aircraft became configured for landing that 1 to 1 1/2 degree more pitch required to hold ILS GS along with more thrust than normal. Suspected that since we were chartered by another cargo airline that weights were incorrect. Even with this in mind, the rotation to touchdown attitude did not arrest the sink rate enough to prevent a harsh landing. Taxi in was normal, tires ok, but a flap mechanism broke and during retraction damaged the right aileron. In retrospect, I knew that the extra pitch meant we were heavier than calculated or that the flight engineer had miscalculated the vref speed. I should have added extra speed even though I couldn't assess where the conflict was coming from. Secondly, if in doubt, leave yourself in the landing confign until a ramp inspection can be done. Avoidable damage could be prevented.
Original NASA ASRS Text
Title: A B747 PIC CITES A HEAVIER THAN PLANNED LNDG WT ON THE HARD LNDG THAT FOLLOWED HIS ILS APCH INTO POS, FO.
Narrative: LNDG WITH ACFT NEAR MAX LNDG WT IN VFR CONDITIONS, LIGHT WINDS. USED ILS FACILITIES FOR APCH AND LNDG. NOTED WHEN ACFT BECAME CONFIGURED FOR LNDG THAT 1 TO 1 1/2 DEG MORE PITCH REQUIRED TO HOLD ILS GS ALONG WITH MORE THRUST THAN NORMAL. SUSPECTED THAT SINCE WE WERE CHARTERED BY ANOTHER CARGO AIRLINE THAT WTS WERE INCORRECT. EVEN WITH THIS IN MIND, THE ROTATION TO TOUCHDOWN ATTITUDE DID NOT ARREST THE SINK RATE ENOUGH TO PREVENT A HARSH LNDG. TAXI IN WAS NORMAL, TIRES OK, BUT A FLAP MECHANISM BROKE AND DURING RETRACTION DAMAGED THE R AILERON. IN RETROSPECT, I KNEW THAT THE EXTRA PITCH MEANT WE WERE HEAVIER THAN CALCULATED OR THAT THE FE HAD MISCALCULATED THE VREF SPD. I SHOULD HAVE ADDED EXTRA SPD EVEN THOUGH I COULDN'T ASSESS WHERE THE CONFLICT WAS COMING FROM. SECONDLY, IF IN DOUBT, LEAVE YOURSELF IN THE LNDG CONFIGN UNTIL A RAMP INSPECTION CAN BE DONE. AVOIDABLE DAMAGE COULD BE PREVENTED.
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.