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Flight crew descended below assigned cruise altitude in response to a TCASII RA. In addition, contact was lost with center until a change to another frequency was used.
| Attributes | |
| ACN | 288914 |
| Time | |
| Date | 199411 |
| Day | Sun |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : cvg |
| State Reference | OH |
| Altitude | msl bound lower : 27200 msl bound upper : 28000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zid |
| Operator | general aviation : corporate |
| Make Model Name | Falcon 900 |
| Operating Under FAR Part | Part 91 |
| Flight Phase | cruise other cruise other |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | climbout : intermediate altitude |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | Other |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 20 flight time total : 10000 flight time type : 1200 |
| ASRS Report | 288914 |
| Person 2 | |
| Affiliation | Other |
| Function | flight crew : first officer |
| Qualification | pilot : cfi pilot : atp |
| Experience | flight time last 90 days : 88 flight time total : 5661 flight time type : 121 |
| ASRS Report | 289097 |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude conflict : airborne less severe other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other controllera other flight crewa |
| Resolutory Action | controller : issued new clearance flight crew : took evasive action other |
| Consequence | faa : reviewed incident with flight crew |
| Miss Distance | horizontal : 30000 vertical : 0 |
| Supplementary | |
| Air Traffic Incident | other |
Narrative:
During cruise at FL280 under ind control 125.7, frequency became unusable due to a 'stuck microphone.' we switched back to last frequency (cle on 126.97). After a short time this controller issued an immediate turn 90 degree right to 270 ft. During turn, TCASII issued TA followed rapidly by RA commanding 2000 FPM descent. Following resolution at 27200 ft returned to FL280. Center returned us to previous route and issued useable frequency. I initiated phone conversation after flight with ind watch supervisor. He described conflict and radio problem just as we had observed. He stated other aircraft also responded to an RA. He thanked us for self initiated frequency change. Said this allowed old controller to issue turn which bought ATC time to sort out radio problem. He acknowledged TCASII value as backup. Alert action by my first officer to get us on usable frequency prevented potential problem from escalating. Lesson learned: if center frequency is jammed, do something on your own to re- establish contact, ie, last frequency, 121.5 etc. Supplemental information from acn 289097: I was the PNF on a da-900 flight from detroit mich (dtw) to louisville kentucky (sof).
Original NASA ASRS Text
Title: FLC DSNDED BELOW ASSIGNED CRUISE ALT IN RESPONSE TO A TCASII RA. IN ADDITION, CONTACT WAS LOST WITH CTR UNTIL A CHANGE TO ANOTHER FREQ WAS USED.
Narrative: DURING CRUISE AT FL280 UNDER IND CTL 125.7, FREQ BECAME UNUSABLE DUE TO A 'STUCK MIKE.' WE SWITCHED BACK TO LAST FREQ (CLE ON 126.97). AFTER A SHORT TIME THIS CTLR ISSUED AN IMMEDIATE TURN 90 DEG R TO 270 FT. DURING TURN, TCASII ISSUED TA FOLLOWED RAPIDLY BY RA COMMANDING 2000 FPM DSCNT. FOLLOWING RESOLUTION AT 27200 FT RETURNED TO FL280. CTR RETURNED US TO PREVIOUS RTE AND ISSUED USEABLE FREQ. I INITIATED PHONE CONVERSATION AFTER FLT WITH IND WATCH SUPVR. HE DESCRIBED CONFLICT AND RADIO PROB JUST AS WE HAD OBSERVED. HE STATED OTHER ACFT ALSO RESPONDED TO AN RA. HE THANKED US FOR SELF INITIATED FREQ CHANGE. SAID THIS ALLOWED OLD CTLR TO ISSUE TURN WHICH BOUGHT ATC TIME TO SORT OUT RADIO PROB. HE ACKNOWLEDGED TCASII VALUE AS BACKUP. ALERT ACTION BY MY FO TO GET US ON USABLE FREQ PREVENTED POTENTIAL PROB FROM ESCALATING. LESSON LEARNED: IF CTR FREQ IS JAMMED, DO SOMETHING ON YOUR OWN TO RE- ESTABLISH CONTACT, IE, LAST FREQ, 121.5 ETC. SUPPLEMENTAL INFO FROM ACN 289097: I WAS THE PNF ON A DA-900 FLT FROM DETROIT MICH (DTW) TO LOUISVILLE KENTUCKY (SOF).
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.