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When cleared to 'descend via' the kohoe RNAV STAR to den 'except maintain 270 KTS' the flight crew of an A320 was unable to comply with subsequent altitude crossing restrictions at sayge. The reporters cited the initial 270 KTS and subsequent 230 KTS ATC restrictions as primary contributing factors.
| Attributes | |
| ACN | 1067128 |
| Time | |
| Date | 201302 |
| Local Time Of Day | 1801-2400 |
| Place | |
| Locale Reference | D01.TRACON |
| State Reference | CO |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Make Model Name | A320 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Descent |
| Route In Use | STAR KOHOE ONE |
| Flight Plan | IFR |
| Person 1 | |
| Function | Pilot Not Flying First Officer |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Person 2 | |
| Function | Pilot Flying Captain |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Events | |
| Anomaly | ATC Issue All Types Deviation - Altitude Crossing Restriction Not Met Deviation - Procedural Clearance Deviation - Procedural Published Material / Policy |
Narrative:
We were cleared to 'descend via' kohoe one arrival except to maintain 270 KTS till slmon. Captain typed 270 KTS in perf page (des) of mcdu. We crossed herng at FL320 and 270 KTS in managed descent. The aircraft started a slow descent after herng and barely made kohoe at FL280 (270 KTS). To compound the situation (and we believe this to be the determining factor to the issue); ATC slowed us to 230 KTS. The aircraft performance was unable to lose 6;000 ft between kohoe and sayge (only 15 DME) with max drag (spoilers) and a change in automation to open des (because managed descent had us leveled off trying to slow to 230 KTS). We advised ATC unable to cross sayge below FL220; then advised unable to cross mokme below 17;000 ft. ATC then gave clearance to maintain 250 KTS and descend to 14;000 ft.we believe trying to slow the aircraft started a chain of events that would not allow the aircraft performance to cross at or below the crossing restrictions. The captain was using good CRM the entire time and was aware immediately that we would not be able to cross sayge below FL220 and mokme below 17;000 ft. With the experience; I would notify ATC (on future flights) that we could either give them the speed or altitudes; but not both.
Original NASA ASRS Text
Title: When cleared to 'descend via' the KOHOE RNAV STAR to DEN 'except maintain 270 KTS' the flight crew of an A320 was unable to comply with subsequent altitude crossing restrictions at SAYGE. The reporters cited the initial 270 KTS and subsequent 230 KTS ATC restrictions as primary contributing factors.
Narrative: We were cleared to 'descend via' Kohoe One Arrival EXCEPT to maintain 270 KTS till SLMON. Captain typed 270 KTS in PERF page (DES) of MCDU. We crossed HERNG at FL320 and 270 KTS in managed descent. The aircraft started a slow descent after HERNG and barely made KOHOE at FL280 (270 KTS). To compound the situation (and we believe this to be the determining factor to the issue); ATC slowed us to 230 KTS. The aircraft performance was unable to lose 6;000 FT between KOHOE and SAYGE (only 15 DME) with max drag (spoilers) and a change in automation to OPEN DES (because managed descent had us leveled off trying to slow to 230 KTS). We advised ATC unable to cross SAYGE below FL220; then advised unable to cross MOKME below 17;000 FT. ATC then gave clearance to maintain 250 KTS and descend to 14;000 FT.We believe trying to slow the aircraft started a chain of events that would not allow the aircraft performance to cross at or below the crossing restrictions. The Captain was using good CRM the entire time and was aware immediately that we would not be able to cross SAYGE below FL220 and MOKME below 17;000 FT. With the experience; I would notify ATC (on future flights) that we could either give them the speed or altitudes; but not both.
Data retrieved from NASA's ASRS site as of July 2013 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.