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DC9 cruising at FL330 in clear WX received a TCASII alert to descend. Descended to FL320 and contacted ATC to insure no other aircraft involved and returned to cruise altitude.
| Attributes | |
| ACN | 414500 |
| Time | |
| Date | 199809 |
| Day | Sat |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : sqs |
| State Reference | MS |
| Altitude | msl bound lower : 32000 msl bound upper : 33000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zme |
| Operator | common carrier : air carrier |
| Make Model Name | DC-9 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 150 flight time total : 9000 flight time type : 5000 |
| ASRS Report | 414500 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument |
| Events | |
| Anomaly | aircraft equipment problem : less severe altitude deviation : excursion from assigned altitude non adherence : clearance other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other flight crewa |
| Resolutory Action | flight crew : took evasive action flight crew : returned to intended course or assigned course other |
| Consequence | Other Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Cruising at 33000 ft, clear skies, we received an RA to descend, which we did, to 32000 ft. Notified ATC and climbed back to 33000 ft. There was no traffic. Our TCASII was apparently faulty. We turned off TCASII for remainder of flight and notified maintenance. No other aircraft involved.
Original NASA ASRS Text
Title: DC9 CRUISING AT FL330 IN CLR WX RECEIVED A TCASII ALERT TO DSND. DSNDED TO FL320 AND CONTACTED ATC TO INSURE NO OTHER ACFT INVOLVED AND RETURNED TO CRUISE ALT.
Narrative: CRUISING AT 33000 FT, CLR SKIES, WE RECEIVED AN RA TO DSND, WHICH WE DID, TO 32000 FT. NOTIFIED ATC AND CLBED BACK TO 33000 FT. THERE WAS NO TFC. OUR TCASII WAS APPARENTLY FAULTY. WE TURNED OFF TCASII FOR REMAINDER OF FLT AND NOTIFIED MAINT. NO OTHER ACFT INVOLVED.
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.