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LR45 captain reported that while departing ads and descending in compliance with a TCAS RA they received a 'don't sink!' message from the GPWS.
| Attributes | |
| ACN | 1315982 |
| Time | |
| Date | 201512 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | ADS.Airport |
| State Reference | TX |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | Learjet 45 |
| Operating Under FAR Part | Part 91 |
| Flight Phase | Initial Climb |
| Route In Use | Vectors |
| Flight Plan | IFR |
| Person 1 | |
| Function | Captain Pilot Not Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) Flight Crew Instrument Flight Crew Multiengine |
| Experience | Flight Crew Last 90 Days 100 Flight Crew Total 18500 Flight Crew Type 1500 |
| Events | |
| Anomaly | Conflict Airborne Conflict Deviation - Altitude Excursion From Assigned Altitude Inflight Event / Encounter CFTT / CFIT |
Narrative:
Departing from ads we were cleared for takeoff from runway 15 and given a turn to heading 090. Our initial altitude clearance was 2000 feet. Ads is directly below the 2000 feet overhang to the dfw class B airspace. A single-engine cirrus was cleared to enter a downwind for runway 15 by the tower. We were warned of the cirrus by tower as we began the turn. Once on a heading of 090 and approaching 2000 feet; we received a TCAS TA then almost immediate RA to descend. I saw the aircraft; however the pilot flying decided to descend just in case I had the wrong plane in sight. In the meantime while following the RA our GPWS gave us a 'don't sink!' command. We were VMC and knew the terrain fairly well. However; we couldn't be sure that there wasn't a tower or unknown object which was not easily visible. We advised ATC of the RA after being switched to fort worth departure by the tower. There was not time to advise ads tower of the RA. Ultimately; it became apparent that if this had been in a lower visibility environment; things might have been even more interesting.
Original NASA ASRS Text
Title: LR45 Captain reported that while departing ADS and descending in compliance with a TCAS RA they received a 'Don't Sink!' message from the GPWS.
Narrative: Departing from ADS we were cleared for takeoff from RWY 15 and given a turn to heading 090. Our initial altitude clearance was 2000 feet. ADS is directly below the 2000 feet overhang to the DFW Class B airspace. A single-engine Cirrus was cleared to enter a downwind for runway 15 by the tower. We were warned of the Cirrus by tower as we began the turn. Once on a heading of 090 and approaching 2000 feet; we received a TCAS TA then almost immediate RA to descend. I saw the aircraft; however the pilot flying decided to descend just in case I had the wrong plane in sight. In the meantime while following the RA our GPWS gave us a 'Don't Sink!' command. We were VMC and knew the terrain fairly well. However; we couldn't be sure that there wasn't a tower or unknown object which was not easily visible. We advised ATC of the RA after being switched to Fort Worth Departure by the tower. There was not time to advise ADS tower of the RA. Ultimately; it became apparent that if this had been in a lower visibility environment; things might have been even more interesting.
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.