MD-80 Series (DC-9-80) Undifferentiated or Other Model
Flight Crew Air Transport Pilot (ATP)
Human-Machine Interface; Situational Awareness; Workload
Deviation - Altitude Crossing Restriction Not Met; Deviation / Discrepancy - Procedural Clearance; Deviation / Discrepancy - Procedural Published Material / Policy
Aircraft; Chart Or Publication; Human Factors; Procedure
We were cleared by ATC to descend via the TAMMY FOUR RNAV STAR. We complied by crossing TAMMY between 16;000 FT and 10;000 FT; crossing at around 14;000 FT MSL. The next waypoint; ROCAB; has a crossing restriction (for aircraft landing 36L/C/R) 'at 10;000 FT' and 'at 230 KTS.' We failed to realize that ROCAB is only 2 miles from TAMMY; and we thus crossed ROCAB significantly higher than 10;000 FT. I asked for relief; but did not hear a reply. The remainder of the approach and landing was uneventful.Better attention to detail would have served me well here. But; this approach should be modified. At TAMMY Intersection; the plate should read: 'Aircraft Landing North; cross TAMMY at 10;000 FT.'
An MD80 Captain; 'descending via' the TAMMY RNAV STAR into MEM where he planned to land to the North; was surprised to have crossed TAMMY 2;000 FT below the top of its 'Between 16;000 FT and 10;000 FT' window only to find himself just two miles from ROCAB which required crossing 'at 10;000 FT' and 'at 230 KTS'.