B737 Undifferentiated or Other Model
Flight Crew Last 90 Days 210; Flight Crew Total 12000; Flight Crew Type 6000
Human-Machine Interface; Situational Awareness
ATC Issue All Types; Deviation - Altitude Crossing Restriction Not Met; Deviation / Discrepancy - Procedural Clearance; Deviation / Discrepancy - Procedural Published Material / Policy
Flight Crew Returned To Clearance
Human Factors; Procedure; Aircraft
On the GIBBZ ONE arrival into IAD; Washington Center told us to cross HESEE at FL240. The box is pre-programmed with HESEE at or above FL240; so I made the altitude hard. The box also has PHOOW at FL270; which is the fix 5.7 NM prior to HESEE. I did not take the PHOOW at FL270 out of the box. We crossed PHOOW on path at FL270; and then were immediately high for HESEE at FL240. I selected LVL change and we crossed HESEE about 250 feet high. No steep descent after PHOOW message was received.
When ATC altered the charted at or above FL240 at HESEE on the GIBBZ RNAV STAR to a hard 'at FL240' the flight crew of the B737 failed to note the crossing at FL270 at PHOOW just 5.7 NM prior to HESEE would make compliance impossible. They crossed HESEE some 250 feet high.