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B757 flight crew receiving confign warning at FL370 along with TCAS RA to descend which they honor. After confign warning is silenced flight crew is informed that no traffic is nearby.
| Attributes | |
| ACN | 762146 |
| Time | |
| Date | 200711 |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : stl.airport |
| State Reference | MO |
| Altitude | msl single value : 37000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zkc.artcc tower : gjt.tower |
| Operator | common carrier : air carrier |
| Make Model Name | B757-200 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 194 flight time total : 13000 flight time type : 6330 |
| ASRS Report | 762146 |
| Events | |
| Anomaly | aircraft equipment problem : less severe altitude deviation : excursion from assigned altitude |
| Independent Detector | other flight crewa |
| Resolutory Action | controller : issued advisory flight crew : returned to assigned altitude flight crew : overcame equipment problem |
| Consequence | other |
| Supplementary | |
| Problem Areas | Aircraft Flight Crew Human Performance |
| Primary Problem | Aircraft |
Narrative:
Ground sensing switch faulted and aircraft thought it was on the ground. Flaps were up and power was at cruise so we got a very loud; non silenceable confign warning. We could not communicate with center or with each other. First officer was flying autoplt engaged. Many warnings came up on EICAS screen one of which was an RA indicating we should descend. Since we could not communicate with center because of the alarm we descended approximately 1300 ft to honor the RA. After I found the circuit breakers for the speakers we talked to center and informed them that we had received an RA and the controller said there was no aircraft in our vicinity and we immediately climbed back to FL370. Aircraft was removed from flight status for repairs.
Original NASA ASRS Text
Title: B757 FLT CREW RECEIVING CONFIGN WARNING AT FL370 ALONG WITH TCAS RA TO DESCEND WHICH THEY HONOR. AFTER CONFIGN WARNING IS SILENCED FLT CREW IS INFORMED THAT NO TRAFFIC IS NEARBY.
Narrative: GND SENSING SWITCH FAULTED AND ACFT THOUGHT IT WAS ON THE GND. FLAPS WERE UP AND PWR WAS AT CRUISE SO WE GOT A VERY LOUD; NON SILENCEABLE CONFIGN WARNING. WE COULD NOT COMMUNICATE WITH CTR OR WITH EACH OTHER. FO WAS FLYING AUTOPLT ENGAGED. MANY WARNINGS CAME UP ON EICAS SCREEN ONE OF WHICH WAS AN RA INDICATING WE SHOULD DSND. SINCE WE COULD NOT COMMUNICATE WITH CTR BECAUSE OF THE ALARM WE DSNDED APPROX 1300 FT TO HONOR THE RA. AFTER I FOUND THE CIRCUIT BREAKERS FOR THE SPEAKERS WE TALKED TO CTR AND INFORMED THEM THAT WE HAD RECEIVED AN RA AND THE CTLR SAID THERE WAS NO ACFT IN OUR VICINITY AND WE IMMEDIATELY CLBED BACK TO FL370. ACFT WAS REMOVED FROM FLT STATUS FOR REPAIRS.
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.