Narrative:

Taking off from runway 31 on bilka 1 departure. Conditions were VFR, ceiling and visibility basically unlimited. First officer's leg. Observed 1 aircraft depart to the south off runway 13, prior to our pushout, but we were given runway 31. Cleared for takeoff on runway 31 by bjx tower, with no reports of any other aircraft in the pattern or area. Told to contact leon approach when airborne. Normal takeoff up to 1000 ft AGL. At 1000 ft AGL/7000 ft MSL -- just after calling for 'half rate -- flaps up -- climb power' as the captain switched to approach control, we got a TCASII RA to 'descend now -- descend' with vsi red and green arcs and a yellow RA symbol on the TCASII/radar screen at approximately 11 O'clock position and slightly high. First officer started to descend, as captain picked up the traffic visually. We cleared the traffic without any problems. The traffic was a DC9, as I recall, that appeared to be doing a downwind entry to runway 31. Once again, we received no warning or advisory from tower of any other traffic in the area prior to takeoff. Commercial flight manual, part ii, domestic coverage page for leon, mexico, cautions that 'airspace is uncontrolled below FL200 except at and below 11000 ft MSL within 10 NM of bjx VOR. Be heads-up for aircraft not in contact with ATC.' my experience at bjx/leon seems to indicate that it may be uncontrolled, even in the air traffic area/class D airspace.

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Original NASA ASRS Text

Title: A MD80 FLT CREW EXPERIENCES A TCASII RA ON TKOF.

Narrative: TAKING OFF FROM RWY 31 ON BILKA 1 DEP. CONDITIONS WERE VFR, CEILING AND VISIBILITY BASICALLY UNLIMITED. FO'S LEG. OBSERVED 1 ACFT DEPART TO THE S OFF RWY 13, PRIOR TO OUR PUSHOUT, BUT WE WERE GIVEN RWY 31. CLRED FOR TKOF ON RWY 31 BY BJX TWR, WITH NO RPTS OF ANY OTHER ACFT IN THE PATTERN OR AREA. TOLD TO CONTACT LEON APCH WHEN AIRBORNE. NORMAL TKOF UP TO 1000 FT AGL. AT 1000 FT AGL/7000 FT MSL -- JUST AFTER CALLING FOR 'HALF RATE -- FLAPS UP -- CLB PWR' AS THE CAPT SWITCHED TO APCH CTL, WE GOT A TCASII RA TO 'DSND NOW -- DSND' WITH VSI RED AND GREEN ARCS AND A YELLOW RA SYMBOL ON THE TCASII/RADAR SCREEN AT APPROX 11 O'CLOCK POS AND SLIGHTLY HIGH. FO STARTED TO DSND, AS CAPT PICKED UP THE TFC VISUALLY. WE CLRED THE TFC WITHOUT ANY PROBS. THE TFC WAS A DC9, AS I RECALL, THAT APPEARED TO BE DOING A DOWNWIND ENTRY TO RWY 31. ONCE AGAIN, WE RECEIVED NO WARNING OR ADVISORY FROM TWR OF ANY OTHER TFC IN THE AREA PRIOR TO TKOF. COMMERCIAL FLT MANUAL, PART II, DOMESTIC COVERAGE PAGE FOR LEON, MEXICO, CAUTIONS THAT 'AIRSPACE IS UNCTLED BELOW FL200 EXCEPT AT AND BELOW 11000 FT MSL WITHIN 10 NM OF BJX VOR. BE HEADS-UP FOR ACFT NOT IN CONTACT WITH ATC.' MY EXPERIENCE AT BJX/LEON SEEMS TO INDICATE THAT IT MAY BE UNCTLED, EVEN IN THE ATA/CLASS D AIRSPACE.

Data retrieved from NASA's ASRS site as of July 2007 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.