An air carrier B757 was cleared to descend to 14000 ft inbound to mex and saw another air carrier aircraft on their TCASII. The B757 followed the TCASII RA and climbed as they watched the other aircraft, a united states air carrier type, pass below and across their flight path. Rptrs feel the other aircraft also saw them and took appropriate action.

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Attributes
ACN	390622
Time
Date	199801
Day	Sun
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : pca
State Reference	FO
Altitude	msl bound lower : 14000 msl bound upper : 25000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : mmex
Operator	common carrier : air carrier
Make Model Name	B757 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	descent other
Route In Use	enroute airway : mmex
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	climbout : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 75 flight time total : 13000 flight time type : 700
ASRS Report	390622
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : atp
ASRS Report	391669
Events
Anomaly	conflict : airborne less severe non adherence : published procedure non adherence : required legal separation
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 24000 vertical : 1000
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

This report involves a TCASII RA while descending into mexico city. We were approaching mmx from the gulf of mexico, descending down to 14000 ft east of positive control area VOR. The controller was late in giving us clearance out of FL260 (we had to request it), and we were expediting our descent to 14000 ft. While passing through FL250 we noticed another aircraft about to climb through our altitude and flight path, approaching from our 10 O'clock position (headed northeast). We got a TCASII RA and followed its directions by initiating a slight climb. Because both aircraft saw each other early, and took appropriate action, there was no immediate threat. Had both aircraft continued on their original flight paths as cleared, however, a near miss (or hit) would have been a definite possibility.

Original NASA ASRS Text

Title: AN ACR B757 WAS CLRED TO DSND TO 14000 FT INBOUND TO MEX AND SAW ANOTHER ACR ACFT ON THEIR TCASII. THE B757 FOLLOWED THE TCASII RA AND CLBED AS THEY WATCHED THE OTHER ACFT, A UNITED STATES ACR TYPE, PASS BELOW AND ACROSS THEIR FLT PATH. RPTRS FEEL THE OTHER ACFT ALSO SAW THEM AND TOOK APPROPRIATE ACTION.

Narrative: THIS RPT INVOLVES A TCASII RA WHILE DSNDING INTO MEXICO CITY. WE WERE APCHING MMX FROM THE GULF OF MEXICO, DSNDING DOWN TO 14000 FT E OF PCA VOR. THE CTLR WAS LATE IN GIVING US CLRNC OUT OF FL260 (WE HAD TO REQUEST IT), AND WE WERE EXPEDITING OUR DSCNT TO 14000 FT. WHILE PASSING THROUGH FL250 WE NOTICED ANOTHER ACFT ABOUT TO CLB THROUGH OUR ALT AND FLT PATH, APCHING FROM OUR 10 O'CLOCK POS (HEADED NE). WE GOT A TCASII RA AND FOLLOWED ITS DIRECTIONS BY INITIATING A SLIGHT CLB. BECAUSE BOTH ACFT SAW EACH OTHER EARLY, AND TOOK APPROPRIATE ACTION, THERE WAS NO IMMEDIATE THREAT. HAD BOTH ACFT CONTINUED ON THEIR ORIGINAL FLT PATHS AS CLRED, HOWEVER, A NEAR MISS (OR HIT) WOULD HAVE BEEN A DEFINITE POSSIBILITY.

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.