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37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
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TCASII airspace design deficiency. Reporter aircraft arriving on a radial conflict with another aircraft departing on the same radial. Reporter and other aircraft were in visual as well as radio contact and each took evasive action. Reporter recommends that flts northbound from gua file routing UR630 to bze and UB764 to preclude such conflicts.
| Attributes | |
| ACN | 360831 |
| Time | |
| Date | 199702 |
| Day | Sun |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : rab airport : aur |
| State Reference | FO |
| Altitude | msl bound lower : 11000 msl bound upper : 11000 |
| Aircraft 1 | |
| Controlling Facilities | tower : ith |
| Operator | common carrier : air carrier |
| Make Model Name | Boeing Company Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : approach descent other |
| Route In Use | arrival other enroute airway : gua |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| ASRS Report | 360831 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial |
| Events | |
| Anomaly | conflict : airborne less severe other anomaly other |
| Independent Detector | other flight crewa other other : unspecified cockpit |
| Resolutory Action | none taken : unable |
| Consequence | Other |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Intra Facility Coordination Failure |
Narrative:
Traffic conflict in the guatemala airport terminal area. On feb/xx/97, a near midair while on approach to gua. WX was partly cloudy. Flight was cleared for the VOR DME -- runway 01 while crossing rabinal VOR in a descent to 11000 ft. Outbound on the rab 184 degree radial, inbound to aur VOR, we received a TCASII alert to climbing traffic at our 12 O'clock position. An air carrier B757 departing gua on the rabinal 2 departure. Within about 2-3 mi of each other, we attained visual and radio contact and each aircraft made additional 30 degree turn- aways to attain acceptable clearance. The underlying problem is the rabinal 2 departure conflicts with the standard arrivals using gua runway 01. Both use the aur 004/rab 184 degree radials. Standard takeoff clearance from gua runway 01 has been the rabinal 2 departure with an unrestr climb to cruise altitude. This obviously conflicts with arrivals from the north over rab. I would suggest an message to warn of this problem on all gua related flts and further investigations and recommendations by our people to safeguard against this accident waiting to happen. On flts from gua we have been filed northbound on UG765. I suggest filing for UR630 to bze and UB764 northbound this will allow us to use the palma 1 departure and avoid these conflicts.
Original NASA ASRS Text
Title: TCASII AIRSPACE DESIGN DEFICIENCY. RPTR ACFT ARRIVING ON A RADIAL CONFLICT WITH ANOTHER ACFT DEPARTING ON THE SAME RADIAL. RPTR AND OTHER ACFT WERE IN VISUAL AS WELL AS RADIO CONTACT AND EACH TOOK EVASIVE ACTION. RPTR RECOMMENDS THAT FLTS NBOUND FROM GUA FILE ROUTING UR630 TO BZE AND UB764 TO PRECLUDE SUCH CONFLICTS.
Narrative: TFC CONFLICT IN THE GUATEMALA ARPT TERMINAL AREA. ON FEB/XX/97, A NEAR MIDAIR WHILE ON APCH TO GUA. WX WAS PARTLY CLOUDY. FLT WAS CLRED FOR THE VOR DME -- RWY 01 WHILE XING RABINAL VOR IN A DSCNT TO 11000 FT. OUTBOUND ON THE RAB 184 DEG RADIAL, INBOUND TO AUR VOR, WE RECEIVED A TCASII ALERT TO CLBING TFC AT OUR 12 O'CLOCK POS. AN ACR B757 DEPARTING GUA ON THE RABINAL 2 DEP. WITHIN ABOUT 2-3 MI OF EACH OTHER, WE ATTAINED VISUAL AND RADIO CONTACT AND EACH ACFT MADE ADDITIONAL 30 DEG TURN- AWAYS TO ATTAIN ACCEPTABLE CLRNC. THE UNDERLYING PROB IS THE RABINAL 2 DEP CONFLICTS WITH THE STANDARD ARRIVALS USING GUA RWY 01. BOTH USE THE AUR 004/RAB 184 DEG RADIALS. STANDARD TKOF CLRNC FROM GUA RWY 01 HAS BEEN THE RABINAL 2 DEP WITH AN UNRESTR CLB TO CRUISE ALT. THIS OBVIOUSLY CONFLICTS WITH ARRIVALS FROM THE N OVER RAB. I WOULD SUGGEST AN MESSAGE TO WARN OF THIS PROB ON ALL GUA RELATED FLTS AND FURTHER INVESTIGATIONS AND RECOMMENDATIONS BY OUR PEOPLE TO SAFEGUARD AGAINST THIS ACCIDENT WAITING TO HAPPEN. ON FLTS FROM GUA WE HAVE BEEN FILED NBOUND ON UG765. I SUGGEST FILING FOR UR630 TO BZE AND UB764 NBOUND THIS WILL ALLOW US TO USE THE PALMA 1 DEP AND AVOID THESE CONFLICTS.
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.