 |
37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
|
DC8 flight crew complies with a 'descend' TCAS RA while flying a repos flight. Temporary loss of communication with ATC may have contributed.
| Attributes | |
| ACN | 697534 |
| Time | |
| Date | 200605 |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | navaid : pdz.vortac |
| State Reference | CA |
| Altitude | msl single value : 6000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : sct.tracon tower : ont.tower |
| Operator | common carrier : air carrier |
| Make Model Name | DC-8 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 91 |
| Flight Phase | cruise : level |
| Route In Use | enroute airway : v8.airway |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | tracon : sct.tracon tower : ont.tower |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| ASRS Report | 697534 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Experience | flight time total : 12000 |
| ASRS Report | 697533 |
| Events | |
| Anomaly | conflict : airborne critical |
| Independent Detector | aircraft equipment : tcas |
| Resolutory Action | flight crew : overcame equipment problem flight crew : took evasive action flight crew : returned to original clearance |
| Miss Distance | horizontal : 0 vertical : 700 |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance ATC Human Performance Aircraft Airspace Structure |
| Primary Problem | Airspace Structure |
Narrative:
Flight was a repos to ont. At 6000 ft en route on V8 almost over pdz VOR; crew received an RA to descend. We began an immediate descend and called socal to report the RA with no response. Captain continued descent to about 5200 ft with aircraft passing overhead with 700 ft separation according to TCAS. No visual was ever obtained. Continued calls to socal were not answered using VHF #2 and resetting the frequency. Tried guard on VHF #1 several times with no response either. Eventually; we recycled the VHF #2 circuit breaker and switched to ont tower frequency on VHF #2. Tower responded immediately. No one ever responded on guard in-flight using VHF #1. VHF #1 worked first time on the ground after landing.
Original NASA ASRS Text
Title: DC8 FLT CREW COMPLIES WITH A 'DSND' TCAS RA WHILE FLYING A REPOS FLT. TEMPORARY LOSS OF COM WITH ATC MAY HAVE CONTRIBUTED.
Narrative: FLT WAS A REPOS TO ONT. AT 6000 FT ENRTE ON V8 ALMOST OVER PDZ VOR; CREW RECEIVED AN RA TO DSND. WE BEGAN AN IMMEDIATE DSND AND CALLED SOCAL TO RPT THE RA WITH NO RESPONSE. CAPT CONTINUED DSCNT TO ABOUT 5200 FT WITH ACFT PASSING OVERHEAD WITH 700 FT SEPARATION ACCORDING TO TCAS. NO VISUAL WAS EVER OBTAINED. CONTINUED CALLS TO SOCAL WERE NOT ANSWERED USING VHF #2 AND RESETTING THE FREQ. TRIED GUARD ON VHF #1 SEVERAL TIMES WITH NO RESPONSE EITHER. EVENTUALLY; WE RECYCLED THE VHF #2 CIRCUIT BREAKER AND SWITCHED TO ONT TWR FREQ ON VHF #2. TWR RESPONDED IMMEDIATELY. NO ONE EVER RESPONDED ON GUARD INFLT USING VHF #1. VHF #1 WORKED FIRST TIME ON THE GND AFTER LNDG.
Data retrieved from NASA's ASRS site as of January 2009 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.