 |
37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
|
Multiple runway operation parallel runways air carrier X TCASII RA from air carrier Y RA ignored visual separation in use.
| Attributes | |
| ACN | 211364 |
| Time | |
| Date | 199205 |
| Day | Mon |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : den |
| State Reference | CO |
| Altitude | msl bound lower : 6000 msl bound upper : 6000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Dusk |
| Aircraft 1 | |
| Controlling Facilities | tower : den |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Transport, High Wing, 2 Turboprop Eng |
| Navigation In Use | Other Other |
| Flight Phase | climbout : initial |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | climbout : initial |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 200 flight time total : 11000 flight time type : 2000 |
| ASRS Report | 211364 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument |
| Events | |
| Anomaly | conflict : airborne less severe other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified |
| Resolutory Action | none taken : anomaly accepted |
| Consequence | Other |
| Miss Distance | horizontal : 1000 vertical : 0 |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | other |
Narrative:
Air carrier X had just taken off from den runway 8L and was accelerating and cleaning up at 500 ft AGL. We got a 'monitor vertical speed' (red arc from 0 FPM down), followed immediately by a 'climb, climb' (red arc from plus 1500 FPM down, green arc plus 1500 to plus 2500 FPM) RA due to an air carrier Y departing runway 8R and passing off our right. We were on a 065 heading, air carrier Y was on 085 heading, and passed off our right at our altitude. Traffic was not in sight prior to RA due to airframe obstruction (5 to 4 O'clock, low). Points to consider: 1) this RA occurred during a critical phase of flight. It caused more hazard due to crew distraction than it prevented. Recommend all RA's be inhibited below 1000 ft. 2) due to heavy weight and acceleration to icing speeds, the aircraft did not have enough energy margin to comply with climb RA. Recommend icing speed envelope inhibits be developed for mdt. 3) due to divergent flight paths, other traffic having us in sight, and ATC having us both in sight, this RA was not justified. Recommend immediate software fix to recognize divergent flight paths. Also, recommend operating TCASII in TA only mode within TCA and air traffic area.
Original NASA ASRS Text
Title: MULTIPLE RWY OP PARALLEL RWYS ACR X TCASII RA FROM ACR Y RA IGNORED VISUAL SEPARATION IN USE.
Narrative: ACR X HAD JUST TAKEN OFF FROM DEN RWY 8L AND WAS ACCELERATING AND CLEANING UP AT 500 FT AGL. WE GOT A 'MONITOR VERT SPD' (RED ARC FROM 0 FPM DOWN), FOLLOWED IMMEDIATELY BY A 'CLB, CLB' (RED ARC FROM PLUS 1500 FPM DOWN, GREEN ARC PLUS 1500 TO PLUS 2500 FPM) RA DUE TO AN ACR Y DEPARTING RWY 8R AND PASSING OFF OUR R. WE WERE ON A 065 HDG, ACR Y WAS ON 085 HDG, AND PASSED OFF OUR R AT OUR ALT. TFC WAS NOT IN SIGHT PRIOR TO RA DUE TO AIRFRAME OBSTRUCTION (5 TO 4 O'CLOCK, LOW). POINTS TO CONSIDER: 1) THIS RA OCCURRED DURING A CRITICAL PHASE OF FLT. IT CAUSED MORE HAZARD DUE TO CREW DISTR THAN IT PREVENTED. RECOMMEND ALL RA'S BE INHIBITED BELOW 1000 FT. 2) DUE TO HVY WT AND ACCELERATION TO ICING SPDS, THE ACFT DID NOT HAVE ENOUGH ENERGY MARGIN TO COMPLY WITH CLB RA. RECOMMEND ICING SPD ENVELOPE INHIBITS BE DEVELOPED FOR MDT. 3) DUE TO DIVERGENT FLT PATHS, OTHER TFC HAVING US IN SIGHT, AND ATC HAVING US BOTH IN SIGHT, THIS RA WAS NOT JUSTIFIED. RECOMMEND IMMEDIATE SOFTWARE FIX TO RECOGNIZE DIVERGENT FLT PATHS. ALSO, RECOMMEND OPERATING TCASII IN TA ONLY MODE WITHIN TCA AND ATA.
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.