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Air carrier on visual receives TCASII RA to climb. Same time must take evasive action descend due to WX balloon.
| Attributes | |
| ACN | 190000 |
| Time | |
| Date | 199109 |
| Day | Sat |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : den |
| State Reference | CO |
| Altitude | agl bound lower : 2200 agl bound upper : 2200 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tower : den |
| Operator | common carrier : air carrier |
| Make Model Name | Large Transport, Low Wing, 3 Turbojet Eng |
| Flight Phase | descent : approach |
| Route In Use | approach : visual |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | descent : approach |
| Route In Use | approach : visual |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : second officer |
| Qualification | pilot : atp pilot : flight engineer |
| Experience | flight time last 90 days : 210 flight time total : 3100 flight time type : 210 |
| ASRS Report | 190000 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude conflict : nmac non adherence : clearance other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other flight crewa |
| Resolutory Action | flight crew : took evasive action |
| Consequence | Other |
| Miss Distance | horizontal : 0 vertical : 100 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
On visual approach to den runway 26R we abruptly descended 300 ft to avoid an apparent WX balloon. The tension associated with this evasive action was exacerbated by the proximity of another aircraft on visual approach to den runway 26L, and a TCASII RA ('climb, climb'), which annunciated just prior to our evasive action. The RA was probably in response to an medium large transport conducting a simultaneous visual approach to the parallel runway. If normal operations (simultaneous visual approachs to parallel runways at denver) cause RA's, then normal operating procedures should be changed. Also, WX balloons should not be released to interfere with aircraft on approach to an airport.
Original NASA ASRS Text
Title: ACR ON VISUAL RECEIVES TCASII RA TO CLB. SAME TIME MUST TAKE EVASIVE ACTION DSND DUE TO WX BALLOON.
Narrative: ON VISUAL APCH TO DEN RWY 26R WE ABRUPTLY DSNDED 300 FT TO AVOID AN APPARENT WX BALLOON. THE TENSION ASSOCIATED WITH THIS EVASIVE ACTION WAS EXACERBATED BY THE PROX OF ANOTHER ACFT ON VISUAL APCH TO DEN RWY 26L, AND A TCASII RA ('CLB, CLB'), WHICH ANNUNCIATED JUST PRIOR TO OUR EVASIVE ACTION. THE RA WAS PROBABLY IN RESPONSE TO AN MLG CONDUCTING A SIMULTANEOUS VISUAL APCH TO THE PARALLEL RWY. IF NORMAL OPS (SIMULTANEOUS VISUAL APCHS TO PARALLEL RWYS AT DENVER) CAUSE RA'S, THEN NORMAL OPERATING PROCS SHOULD BE CHANGED. ALSO, WX BALLOONS SHOULD NOT BE RELEASED TO INTERFERE WITH ACFT ON APCH TO AN ARPT.
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.