Narrative:

Arena 1A (runway 15) arrival followed by 'ILS or localizer Z 15'. Received clearance 'descend via.' in a separate sentence there was also a clearance for ILS Z 15 approach. We tried to get confirmation as to what was meant by 'cleared via'. After pai VOR pilot flying went direct to a point on the final approach (lock or suli I think) and continued descent toward 2;000. Pilot not flying was monitoring arrival fixes after pai on fix page (as they had dropped out of legs page) and crosschecking their crossing altitudes. The approach has a fix 'natu' that does not appear on arrival chart. It is located outside of several fixes that do appear on arrival chart. Natu has a ball note for 'mandatory 7;000'' crossing. Mile or two outside of natu descending through 5;600 ft; ATC informed [us] we should be at 7;000. Pilot flying immediately climbed back to 7;000 ft to cross natu then continued descent. No terrain warnings received by egpws or ATC. Normal approach and landing followed. We need to get a clearer understanding of which lateral and vertical path (approach chart vs. Arrival chart) we are to be flying and have better situation awareness of the most conservative crossing restrictions depicted on the different charts.

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Original NASA ASRS Text

Title: An air carrier crew confused by ATC's SBGL ARENA 1A clearance flew direct SULI after PAI descending to 2;000 FT while observing FMC STAR constraints. However; the ILS/LOC Z Runway 15 7;000 FT NATU constraint on ILS is not shown on the FMC when following the ARENA 1A arrival; and was not observed on the approach.

Narrative: Arena 1A (RWY 15) Arrival followed by 'ILS or LOC Z 15'. Received clearance 'Descend Via.' In a separate sentence there was also a clearance for ILS Z 15 approach. We tried to get confirmation as to what was meant by 'cleared via'. After PAI VOR pilot flying went direct to a point on the final approach (LOCK or SULI I think) and continued descent toward 2;000. Pilot not flying was monitoring arrival fixes after PAI on fix page (as they had dropped out of legs page) and crosschecking their crossing altitudes. The approach has a fix 'NATU' that does not appear on Arrival chart. It is located outside of several fixes that do appear on arrival chart. NATU has a ball note for 'Mandatory 7;000'' crossing. Mile or two outside of NATU descending through 5;600 FT; ATC informed [us] we should be at 7;000. Pilot flying immediately climbed back to 7;000 FT to cross NATU then continued descent. No terrain warnings received by EGPWS or ATC. Normal approach and landing followed. We need to get a clearer understanding of which lateral and vertical path (approach chart vs. arrival chart) we are to be flying and have better situation awareness of the most conservative crossing restrictions depicted on the different charts.

Data retrieved from NASA's ASRS site as of April 2012 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.