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An emb-140 flight crew failed to comply with the 6;000 ft MSL crossing restriction at butts on the aldan RNAV STAR into rdu. Task saturation due to multiple crossing restriction restraints; in particular above/below windows; was cited as the primary contributing factor.
| Attributes | |
| ACN | 1072816 |
| Time | |
| Date | 201303 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | RDU.Airport |
| State Reference | NC |
| Aircraft 1 | |
| Make Model Name | EMB ERJ 140 ER/LR |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Descent |
| Route In Use | STAR ALDAN1 |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Autoflight System |
| Person 1 | |
| Function | Pilot Not Flying First Officer |
| Qualification | Flight Crew Commercial |
| Person 2 | |
| Function | Captain Pilot Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Events | |
| Anomaly | Deviation - Altitude Crossing Restriction Not Met Deviation - Procedural Clearance Deviation - Procedural Published Material / Policy |
Narrative:
[While descending via] the aldan arrival into rdu we missed the assigned crossing restriction for the final fix of butts. We were task saturated in the cockpit and missed the crossing.although not a direct influence on this event; the new RNAV procedures that include numerous altitude 'gates' (ceiling and floors) create an extremely high workload and cause task saturation in the cockpit. The FMS does not allow for us to assign multiple restrictions to a single fix; so many of the altitudes must be manually computed for the crossings. The task saturation from these crossings contributed by condensing the time available for additional flight duties.amend the RNAV procedures to include single altitudes at fixes and not gates.
Original NASA ASRS Text
Title: An EMB-140 flight crew failed to comply with the 6;000 FT MSL crossing restriction at BUTTS on the ALDAN RNAV STAR into RDU. Task saturation due to multiple crossing restriction restraints; in particular above/below windows; was cited as the primary contributing factor.
Narrative: [While descending via] the ALDAN arrival into RDU we missed the assigned crossing restriction for the final fix of BUTTS. We were task saturated in the cockpit and missed the crossing.Although not a direct influence on this event; the new RNAV procedures that include numerous altitude 'gates' (ceiling and floors) create an extremely high workload and cause task saturation in the cockpit. The FMS does not allow for us to assign multiple restrictions to a single fix; so many of the altitudes must be manually computed for the crossings. The task saturation from these crossings contributed by condensing the time available for additional flight duties.Amend the RNAV procedures to include single altitudes at fixes and not gates.
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.