Narrative:

As we were taxiing off the runway after landing in montego bay; jamaica (mkjs); I (first officer) noticed that there was an antiskid caution message shown on the EICAS. The message extinguished approximately 1 min after it appeared during the taxi in; however; reappeared as a status message on the EICAS after the aircraft was parked. No adverse braking indications were observed. The captain entered the antiskid malfunction into the logbook upon arrival at the gate. The crew had approximately 6 hours of ground time before we would return to new york; and went as scheduled to the hotel provided for us. In that time; our on-board mechanic troubleshot the situation; and found it was necessary to defer the entire antiskid system. When returning to the airport from our short stay in the hotel; the captain reviewed the logbook and found that the antiskid system was deferred. However; the corrective action entered by the mechanic made it difficult to understand if one antiskid unit was deferred; or if the whole system was deferred. Approximately 10 mins later; the mechanic appeared and advised us that the entire antiskid system was deferred. In preparing the performance and weight and balance data for our return; I asked the captain where the performance reductions (either to weight and/or V1 speed) were for antiskid inoperative; because the information was not published in our performance book. He called dispatch and asked them what the weight and V1 penalties were; and also inquired where we could find that information for ourselves. Our dispatcher advised the captain there was no weight penalty or V1 penalty for takeoff. I made a comment to the captain that that could not be true; because if we had to reject the takeoff our braking distance had to be longer without the antiskid; and our takeoff decision speed would have to come at a lower speed. The captain took my thoughts into consideration; and then said it might be in the QRH. I studied the book for several mins; first looking at the antiskid inoperative corrective actions in the QRH; and then reviewing the performance section. The corrective actions did not make any reference to where performance data could be found; and while looking at the V1 adjustment charts for takeoff in the beginning of the performance section; there was nothing listed for antiskid inoperative (only corrections for slope; wind; and clearway/stopway). However; in the performance section I did find 'advisory information' for landing distance correction numbers with antiskid inoperative; but again nothing for takeoff. I again looked at the index of the performance section; and still found nothing that satisfied my search for the information I needed. The captain then asked the mechanic if he had any information about performance reductions. The mechanic left the flight deck for a few mins and placed a phone call (I do not know who he called). He returned to the cockpit and assured us that there was no performance reduction. I again posed the question to the captain and mechanic about the need for a reduced V1 speed and I questioned the mechanic about his findings. However; the captain was satisfied with the information provided to him by the mechanic; and previously; our dispatcher. The performance data was completed without imposing any restrs to weight or V1 speed. 3 days after returning from this flight; I was reading through the QRH and finally found a small section on takeoff penalties for antiskid inoperative in the back of the performance section. I must have overlooked it; as it was several pages behind the antiskid inoperative penalties for landing section; and was not clearly indicated in the index of the QRH. This possible overweight takeoff could have been avoided if the flight crew received accurate information from dispatch and the mechanic; and if I read the performance section of the QRH a little more thoroughly. Also; neither the MEL; nor the antiskid inoperative corrective action section of the QRH advised the crew to look in the QRH to find the penalties associated with the antiskid inoperative. Seeing that the antiskid section of our QRH is not a memory item; I would hope that some direction would be given as to where the penalties would be located after the system became inoperative.

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Original NASA ASRS Text

Title: B757 CREW DEPARTING MKJS FAILED TO MAKE PERFORMANCE CORRECTIONS FOR ANTISKID INOP MEL.

Narrative: AS WE WERE TAXIING OFF THE RWY AFTER LNDG IN MONTEGO BAY; JAMAICA (MKJS); I (FO) NOTICED THAT THERE WAS AN ANTISKID CAUTION MESSAGE SHOWN ON THE EICAS. THE MESSAGE EXTINGUISHED APPROX 1 MIN AFTER IT APPEARED DURING THE TAXI IN; HOWEVER; REAPPEARED AS A STATUS MESSAGE ON THE EICAS AFTER THE ACFT WAS PARKED. NO ADVERSE BRAKING INDICATIONS WERE OBSERVED. THE CAPT ENTERED THE ANTISKID MALFUNCTION INTO THE LOGBOOK UPON ARR AT THE GATE. THE CREW HAD APPROX 6 HRS OF GND TIME BEFORE WE WOULD RETURN TO NEW YORK; AND WENT AS SCHEDULED TO THE HOTEL PROVIDED FOR US. IN THAT TIME; OUR ON-BOARD MECH TROUBLESHOT THE SITUATION; AND FOUND IT WAS NECESSARY TO DEFER THE ENTIRE ANTISKID SYS. WHEN RETURNING TO THE ARPT FROM OUR SHORT STAY IN THE HOTEL; THE CAPT REVIEWED THE LOGBOOK AND FOUND THAT THE ANTISKID SYS WAS DEFERRED. HOWEVER; THE CORRECTIVE ACTION ENTERED BY THE MECH MADE IT DIFFICULT TO UNDERSTAND IF ONE ANTISKID UNIT WAS DEFERRED; OR IF THE WHOLE SYS WAS DEFERRED. APPROX 10 MINS LATER; THE MECH APPEARED AND ADVISED US THAT THE ENTIRE ANTISKID SYS WAS DEFERRED. IN PREPARING THE PERFORMANCE AND WT AND BAL DATA FOR OUR RETURN; I ASKED THE CAPT WHERE THE PERFORMANCE REDUCTIONS (EITHER TO WT AND/OR V1 SPD) WERE FOR ANTISKID INOP; BECAUSE THE INFO WAS NOT PUBLISHED IN OUR PERFORMANCE BOOK. HE CALLED DISPATCH AND ASKED THEM WHAT THE WT AND V1 PENALTIES WERE; AND ALSO INQUIRED WHERE WE COULD FIND THAT INFO FOR OURSELVES. OUR DISPATCHER ADVISED THE CAPT THERE WAS NO WT PENALTY OR V1 PENALTY FOR TKOF. I MADE A COMMENT TO THE CAPT THAT THAT COULD NOT BE TRUE; BECAUSE IF WE HAD TO REJECT THE TKOF OUR BRAKING DISTANCE HAD TO BE LONGER WITHOUT THE ANTISKID; AND OUR TKOF DECISION SPD WOULD HAVE TO COME AT A LOWER SPD. THE CAPT TOOK MY THOUGHTS INTO CONSIDERATION; AND THEN SAID IT MIGHT BE IN THE QRH. I STUDIED THE BOOK FOR SEVERAL MINS; FIRST LOOKING AT THE ANTISKID INOP CORRECTIVE ACTIONS IN THE QRH; AND THEN REVIEWING THE PERFORMANCE SECTION. THE CORRECTIVE ACTIONS DID NOT MAKE ANY REF TO WHERE PERFORMANCE DATA COULD BE FOUND; AND WHILE LOOKING AT THE V1 ADJUSTMENT CHARTS FOR TKOF IN THE BEGINNING OF THE PERFORMANCE SECTION; THERE WAS NOTHING LISTED FOR ANTISKID INOP (ONLY CORRECTIONS FOR SLOPE; WIND; AND CLEARWAY/STOPWAY). HOWEVER; IN THE PERFORMANCE SECTION I DID FIND 'ADVISORY INFO' FOR LNDG DISTANCE CORRECTION NUMBERS WITH ANTISKID INOP; BUT AGAIN NOTHING FOR TKOF. I AGAIN LOOKED AT THE INDEX OF THE PERFORMANCE SECTION; AND STILL FOUND NOTHING THAT SATISFIED MY SEARCH FOR THE INFO I NEEDED. THE CAPT THEN ASKED THE MECH IF HE HAD ANY INFO ABOUT PERFORMANCE REDUCTIONS. THE MECH LEFT THE FLT DECK FOR A FEW MINS AND PLACED A PHONE CALL (I DO NOT KNOW WHO HE CALLED). HE RETURNED TO THE COCKPIT AND ASSURED US THAT THERE WAS NO PERFORMANCE REDUCTION. I AGAIN POSED THE QUESTION TO THE CAPT AND MECH ABOUT THE NEED FOR A REDUCED V1 SPD AND I QUESTIONED THE MECH ABOUT HIS FINDINGS. HOWEVER; THE CAPT WAS SATISFIED WITH THE INFO PROVIDED TO HIM BY THE MECH; AND PREVIOUSLY; OUR DISPATCHER. THE PERFORMANCE DATA WAS COMPLETED WITHOUT IMPOSING ANY RESTRS TO WT OR V1 SPD. 3 DAYS AFTER RETURNING FROM THIS FLT; I WAS READING THROUGH THE QRH AND FINALLY FOUND A SMALL SECTION ON TKOF PENALTIES FOR ANTISKID INOP IN THE BACK OF THE PERFORMANCE SECTION. I MUST HAVE OVERLOOKED IT; AS IT WAS SEVERAL PAGES BEHIND THE ANTISKID INOP PENALTIES FOR LNDG SECTION; AND WAS NOT CLRLY INDICATED IN THE INDEX OF THE QRH. THIS POSSIBLE OVERWT TKOF COULD HAVE BEEN AVOIDED IF THE FLT CREW RECEIVED ACCURATE INFO FROM DISPATCH AND THE MECH; AND IF I READ THE PERFORMANCE SECTION OF THE QRH A LITTLE MORE THOROUGHLY. ALSO; NEITHER THE MEL; NOR THE ANTISKID INOP CORRECTIVE ACTION SECTION OF THE QRH ADVISED THE CREW TO LOOK IN THE QRH TO FIND THE PENALTIES ASSOCIATED WITH THE ANTISKID INOP. SEEING THAT THE ANTISKID SECTION OF OUR QRH IS NOT A MEMORY ITEM; I WOULD HOPE THAT SOME DIRECTION WOULD BE GIVEN AS TO WHERE THE PENALTIES WOULD BE LOCATED AFTER THE SYS BECAME INOP.

Data retrieved from NASA's ASRS site as of January 2009 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.