Narrative:

Descending into ewr on a flight that originated in cgn with an intermediate stop at stn spoiler pump pressure was reported low by the flight engineer: 2400 psi instead of 2800 psi as required by the aircraft operating manual (aom). At approximately the same time we experienced a failure of the captain's airspeed indicator and intermittently the first officer's altimeter. We attempted to rectify these two additional failures to no avail. The 'abnormal spoiler pressure checklist' was accomplished and the landing proceeded otherwise uneventfully. On touchdown the spoiler pressure reached the normal 3000 psi and the spoilers operated as expected. Reviewing the events, it was noticed that the landing data for this abnormal operation was not checked due to the additional workload. Data for this specific abnormal situation could not be found when we looked for it, in review. The procedure calls for alternate spoiler activation through the main hydraulic system as well as landing with flaps at a maximum of 35 degrees. Data could be found for alternate spoiler deployment with full flaps and landing distance for flaps 35 degrees but not for both alternate spoiler deployment and flaps 35 degrees. The landing weight for ewr with the alternate spoiler operation was 197000 pounds however, our landing weight was 240000 pounds. Therefore we can assume that the landing was accomplished without meeting far field length limits. This oversight occurred for the following reasons: the proper data was not available (the company has been notified), we had multiple failures occurring in the terminal area on an IFR day with typical heavy morning air traffic in the new york area.

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Original NASA ASRS Text

Title: FLC OF ACR WDB ACFT INADVERTENTLY LANDED OVER THE ACFT WT FOR THE RWY USED.

Narrative: DSNDING INTO EWR ON A FLT THAT ORIGINATED IN CGN WITH AN INTERMEDIATE STOP AT STN SPOILER PUMP PRESSURE WAS RPTED LOW BY THE FE: 2400 PSI INSTEAD OF 2800 PSI AS REQUIRED BY THE ACFT OPERATING MANUAL (AOM). AT APPROX THE SAME TIME WE EXPERIENCED A FAILURE OF THE CAPT'S AIRSPD INDICATOR AND INTERMITTENTLY THE FO'S ALTIMETER. WE ATTEMPTED TO RECTIFY THESE TWO ADDITIONAL FAILURES TO NO AVAIL. THE 'ABNORMAL SPOILER PRESSURE CHKLIST' WAS ACCOMPLISHED AND THE LNDG PROCEEDED OTHERWISE UNEVENTFULLY. ON TOUCHDOWN THE SPOILER PRESSURE REACHED THE NORMAL 3000 PSI AND THE SPOILERS OPERATED AS EXPECTED. REVIEWING THE EVENTS, IT WAS NOTICED THAT THE LNDG DATA FOR THIS ABNORMAL OPERATION WAS NOT CHKED DUE TO THE ADDITIONAL WORKLOAD. DATA FOR THIS SPECIFIC ABNORMAL SITUATION COULD NOT BE FOUND WHEN WE LOOKED FOR IT, IN REVIEW. THE PROC CALLS FOR ALTERNATE SPOILER ACTIVATION THROUGH THE MAIN HYD SYS AS WELL AS LNDG WITH FLAPS AT A MAX OF 35 DEGS. DATA COULD BE FOUND FOR ALTERNATE SPOILER DEPLOYMENT WITH FULL FLAPS AND LNDG DISTANCE FOR FLAPS 35 DEGS BUT NOT FOR BOTH ALTERNATE SPOILER DEPLOYMENT AND FLAPS 35 DEGS. THE LNDG WT FOR EWR WITH THE ALTERNATE SPOILER OPERATION WAS 197000 LBS HOWEVER, OUR LNDG WT WAS 240000 LBS. THEREFORE WE CAN ASSUME THAT THE LNDG WAS ACCOMPLISHED WITHOUT MEETING FAR FIELD LENGTH LIMITS. THIS OVERSIGHT OCCURRED FOR THE FOLLOWING REASONS: THE PROPER DATA WAS NOT AVAILABLE (THE COMPANY HAS BEEN NOTIFIED), WE HAD MULTIPLE FAILURES OCCURRING IN THE TERMINAL AREA ON AN IFR DAY WITH TYPICAL HEAVY MORNING AIR TFC IN THE NEW YORK AREA.

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.