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Incidents related to Issue 1 incident related to this issue.

Issue: planning requirements may be increased (Issue #158)
Description: Flying an automated aircraft may take more planning than flying a manual aircraft. Pilots may not plan far enough ahead to use automated systems, so safety may be compromised.

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  2. Accession Number: 410940
    Synopsis: B747-400 CAPT ATTEMPTED TO DSND USING ACFT AUTOMATION. WHEN REPROGRAMMED TO COMPLY WITH A NEW CLRNC, DSCNT WAS DELAYED EXCESSIVELY.
    Narrative: MY ACFT WAS GIVEN A XING RESTR OF A POINT ABOUT 30 MI E OF ECK VOR TO BE AT OR BELOW FL290 THEN PLT DISCRETION TO FL240. A DSCNT FROM FL390 WAS STARTED. THE FMC WAS REPROGRAMMED AT ABOUT FL300 FOR A CRUISE ALT OF FL290 SO THAT A NEW TOP OF DSCNT HAD TO BE FIGURED SO AS TO START DOWN IN TIME TO CROSS THE POLAK INTXN AT 12000 FT. THE FMC LEVELED THE ACFT OFF AT ABOUT FL296 WHILE IT COMPUTED A NEW TOP OF DSCNT POINT (APPROX 30 SECONDS). THAT 30 SECOND PERIOD WAS LONG ENOUGH FOR AN ACFT TO GET WITHIN 2000 FT OF OUR ACFT (HE WAS AT FL310). ATC WARNED US TO DSND THE OTHER 600 FT IMMEDIATELY, WHICH WE DID. I DON'T BELIEVE A VIOLATION WAS FILED BUT IT TAUGHT ME A GOOD LESSON IN USING THE FMC.
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