While on approach into las vegas; flight crew experienced ambiguity in required altitudes between ST...

Narrative:

Inbound to las via GRNPA1; we were told to expect the RNAV visual 19R. The approach had been previously loaded into the FMS; planned and briefed according to procedures and company policy. We were cleared direct to trrop and after visual confirmation of the field; cleared for the RNAV visual approach to 19R. The next lower crossing restriction was eastr at 3;500 feet; so the altitude was selected in preparation for crossing trrop the intermediate fix. LNAV and VNAV were verified.trrop has an 'at or above 6;000 feet' restriction on the approach plate but not on the arrival. We discovered just prior to trrop that our altitude was approximately 5;300 feet prior to trrop and the 6;000 feet crossing restriction was no longer in the FMS for trrop. We leveled off until crossing trrop and the approach was continued normally.it is unclear; but possible; that the trrop on the arrival (with no crossing restriction) may have been incorrectly selected instead of the trrop on the approach that has the 6;000 feet restriction. ATC said nothing in regard to the altitude deviation; and terrain was not a factor. The remainder of the approach was normal.

Original NASA ASRS Text

Title: While on approach into Las Vegas; flight crew experienced ambiguity in required altitudes between STAR and RNAV Visual approach charts.

Narrative: Inbound to LAS via GRNPA1; we were told to expect the RNAV Visual 19R. The approach had been previously loaded into the FMS; planned and briefed according to procedures and Company Policy. We were cleared direct to TRROP and after visual confirmation of the field; cleared for the RNAV Visual Approach to 19R. The next lower crossing restriction was EASTR at 3;500 feet; so the altitude was selected in preparation for crossing TRROP the intermediate fix. LNAV and VNAV were verified.TRROP has an 'at or above 6;000 feet' restriction on the approach plate but not on the arrival. We discovered just prior to TRROP that our altitude was approximately 5;300 feet prior to TRROP and the 6;000 feet crossing restriction was no longer in the FMS for TRROP. We leveled off until crossing TRROP and the approach was continued normally.It is unclear; but possible; that the TRROP on the arrival (with no crossing restriction) may have been incorrectly selected instead of the TRROP on the approach that has the 6;000 feet restriction. ATC said nothing in regard to the altitude deviation; and terrain was not a factor. The remainder of the approach was normal.

Data retrieved from NASA's ASRS site 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.

Attributes
ACN	1374604
Time
Date	201607
Local Time Of Day	1801-2400
Place
Locale Reference	LAS.Airport
State Reference	NV
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Large Transport
Operating Under FAR Part	Part 121
Flight Phase	Initial Approach
Route In Use	Visual Approach STAR GRNPA1
Flight Plan	IFR
Person 1
Function	Captain
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Deviation - Altitude Crossing Restriction Not Met Deviation - Altitude Overshoot Deviation - Procedural Published Material / Policy

While on approach into las vegas; flight crew experienced ambiguity in required altitudes between STAR and RNAV visual approach charts.