An air carrier on the glen rose 8 arrival was held at 17;000 ft for military traffic with an expect ...

Narrative:

On glen rose nine arrival into dfw we were help up high at 17;000 ft for crossing traffic 500 below (military). As the traffic approached we received an RA to climb. After clearing conflict back on way down to 17;000 ft I misunderstood a clearance for lower to 11;000. By the time I realized the mistake I had descended to 16;700 ft before climbing back to 17;000 ft. The clearance was actually for another aircraft. I think I took it by mistake partly because I was told to expect lower when clearing traffic. I was expecting it right away because by now we were getting really close to isabl intersection with an expectation to cross that at 11;000 ft. This was going to be very difficult if descent was not initiated very soon. There was also a lot of confusion with the controller over the RA as to what we were doing. The confusion on the frequency along with the expectation of lower I believe led to the confusion and taking the wrong clearance by mistake.

Original NASA ASRS Text

Title: An Air Carrier on the Glen Rose 8 Arrival was held at 17;000 FT for military traffic with an expect 11;000 FT clearance but after the traffic caused a TCAS RA and was clear the Captain erroneously began a descent to 11;000 but was stopped by his First Officer.

Narrative: On Glen Rose Nine arrival into DFW we were help up high at 17;000 FT for crossing traffic 500 below (military). As the traffic approached we received an RA to climb. After clearing conflict back on way down to 17;000 FT I misunderstood a clearance for lower to 11;000. By the time I realized the mistake I had descended to 16;700 FT before climbing back to 17;000 FT. The clearance was actually for another aircraft. I think I took it by mistake partly because I was told to expect lower when clearing traffic. I was expecting it right away because by now we were getting really close to ISABL Intersection with an expectation to cross that at 11;000 FT. This was going to be very difficult if descent was not initiated very soon. There was also a lot of confusion with the Controller over the RA as to what we were doing. The confusion on the frequency along with the expectation of lower I believe led to the confusion and taking the wrong clearance by mistake.

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.

Attributes
ACN	976237
Time
Date	201110
Local Time Of Day	0601-1200
Place
Locale Reference	ZFW.ARTCC
State Reference	TX
Aircraft 1
Make Model Name	Large Transport Low Wing 2 Turbojet Eng
Operating Under FAR Part	Part 121
Flight Phase	Descent
Flight Plan	IFR
Aircraft 2
Make Model Name	Fighter
Operating Under FAR Part	Part 91
Flight Phase	Cruise
Person 1
Function	Captain Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Person 2
Function	First Officer Pilot Not Flying
Events
Anomaly	Deviation - Altitude Excursion From Assigned Altitude Deviation - Procedural Clearance

An air carrier on the glen rose 8 arrival was held at 17;000 ft for military traffic with an expect 11;000 ft clearance but after the traffic caused a TCAS RA and was clear the captain erroneously began a descent to 11;000 but was stopped by his first officer.