AN ACI ON BOARD AN A320 STOPS THE FO DURING HIS FUEL ON BOARD CALCULATIONS WHEN HE NOTICES THAT THE FUEL FORM IS NOT BEING FILLED OUT CORRECTLY; WITH CALCULATIONS PERFORMED ON THE HANDHELD COMPUTER INSTEAD.

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AT XA15Z; FUEL CHK AT RENO. FAA WATCHED FO DO THE FUEL REASONABLENESS CHK AS PART OF OUR PREFLT PROCS. THE FAA INSPECTOR WAS NOT HAPPY THAT THE FO DID NOT ENTER ANY NUMBERS OR VALUES ON LINES 'A' AND 'B.' ALSO; FUELER DID NOT FILL IN LINE 'C.' ALL ITEMS WERE CHKED AND THE ACFT PASSED THE REASONABLENESS CHK. HOWEVER; THE FO FAILED TO WRITE THE NUMBERS IN LINE 'A' AND 'B.' THE FAA INSPECTOR WAS REFING ACR APPROVED FLT OPS MANUAL. 'ENTER THIS FIGURE AS ITEM 'A' (TOTAL METERED).' ADD ITEM 'A' TO THE BEFORE FUELING TANK QUANTITY TOTALS AND RECORD THIS TOTAL AS ITEM 'B' (TOTAL COMPUTER FUEL).' ITEM B MUST BE WITHIN 5% OR 5000 LBS (WHICH EVER IS LESS) OF ITEM 'C.' ITEM 'A' WAS ENTERED IN FO'S CALCULATOR AND RECORDED IN THE CALCULATOR'S MEMORY; BUT NOT ENTERED ON OR IN BOX 'A' OF THE FUEL FORM. BEFORE FUELING TANK QUANTITY WAS ADDED TO 'A' IN THE FO'S CALCULATOR AND A TOTAL COMPUTER FUEL WAS DISPLAYED ON THE CALCULATOR; BUT NOT ENTERED ON OR IN LINE 'B' (BOX 'B'). 'B' ON CALCULATOR WAS COMPARED TO 'C' ('C' WAS BLANK; A VALUE NOT COMPUTED BY THE FUELER). THE VALUE OF 'C' WAS READILY AVAILABLE TO THE FO BY ADDING FUEL TANK VALUES ABOVE 'C'. 'B' AND 'C' COMPARED REASONABLY SO THE 'REASONABLENESS CHK' REFERRED TO IN THE FOM WAS MET BUT THE VALUES WERE NOT RECORDED ON THE FORM 'OP76.' OUR ACTION: AN AIR SAFETY RPT WILL BE FILED BY THE FO AND ME (CAPT) TO ACR X IN AN EFFORT TO GET THE SENTENCE WORDING CHANGED TO SAY: 'ENTER THIS FIGURE ON OR IN BOX A (TOTAL METERED). ADD ITEM A TO THE BEFORE FUELING TANK QUANTITY TOTALS AND ENTER THIS TOTAL ON OR IN BOX 'B' (TOTAL COMPUTED FUEL). ENSURE BOX 'C' IS FILLED IN BY FUELER. COMPARE BOX 'B' VALUE TO BOX 'C' VALUE INSURING BOX 'B' VALUE IS WITHIN 5% OR 5000 LBS (WHICH EVER IS LESS) OF ITEM 'C.'