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Aircraft received a TCASII TA followed by an RA while on approach. The tower may have been speaking to the intruder aircraft in a foreign language.
| Attributes | |
| ACN | 429931 |
| Time | |
| Date | 199903 |
| Day | Tue |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : mroc.airport |
| State Reference | FO |
| Altitude | msl single value : 5000 |
| Environment | |
| Flight Conditions | Mixed |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tower : mroc.tower |
| Operator | common carrier : air carrier |
| Make Model Name | A300 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | ils localizer & glide slope : 10c0 other |
| Flight Phase | descent : approach |
| Route In Use | approach : instrument precision |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| ASRS Report | 429931 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument pilot : multi engine |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : published procedure |
| Independent Detector | aircraft equipment : tcas other flight crewa other flight crewb |
| Resolutory Action | flight crew : took evasive action flight crew : returned to original clearance |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
Narrative:
XA25Z, frequency 118.6, 5000 ft, mroc tower. Location: ILS approach at mroc runway 7. On localizer and GS to mroc runway 7 at about 5000 ft MSL, a TA popped up at 1-2 O'clock position at about 1/2 mi. The tower was talking to another aircraft in spanish in a very agitated fashion. The RA came up about the time we changed scales on the TCASII screen -- not 10 seconds after the TA. The RA called for a descent of 1000-1200 FPM. We were VFR below a cloud deck, which gave us the freedom to follow the RA, which of course took us below the GS. After about 10-15 seconds, the RA changed to monitor vertical speed. We never saw the other aircraft, nor did tower alert us to the intruder.
Original NASA ASRS Text
Title: ACFT RECEIVED A TCASII TA FOLLOWED BY AN RA WHILE ON APCH. THE TWR MAY HAVE BEEN SPEAKING TO THE INTRUDER ACFT IN A FOREIGN LANGUAGE.
Narrative: XA25Z, FREQ 118.6, 5000 FT, MROC TWR. LOCATION: ILS APCH AT MROC RWY 7. ON LOC AND GS TO MROC RWY 7 AT ABOUT 5000 FT MSL, A TA POPPED UP AT 1-2 O'CLOCK POS AT ABOUT 1/2 MI. THE TWR WAS TALKING TO ANOTHER ACFT IN SPANISH IN A VERY AGITATED FASHION. THE RA CAME UP ABOUT THE TIME WE CHANGED SCALES ON THE TCASII SCREEN -- NOT 10 SECONDS AFTER THE TA. THE RA CALLED FOR A DSCNT OF 1000-1200 FPM. WE WERE VFR BELOW A CLOUD DECK, WHICH GAVE US THE FREEDOM TO FOLLOW THE RA, WHICH OF COURSE TOOK US BELOW THE GS. AFTER ABOUT 10-15 SECONDS, THE RA CHANGED TO MONITOR VERT SPD. WE NEVER SAW THE OTHER ACFT, NOR DID TWR ALERT US TO THE INTRUDER.
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.