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B717 flight crew overshot assigned descent altitude due to forgetting assigned altitude after responding to a TCASII RA. Frequency congestion, another company aircraft with similar call sign responding to reporter's clearance and the captain being distraction by conversing with the jump seat observer.
| Attributes | |
| ACN | 535953 |
| Time | |
| Date | 200112 |
| Day | Mon |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | intersection : macey |
| State Reference | GA |
| Altitude | msl bound lower : 21000 msl bound upper : 24000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : ztl.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B717 (Formerly MD-95) |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other |
| Flight Phase | descent : intermediate altitude |
| Route In Use | arrival star : macey.macey2 |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : ztl.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : intermediate altitude |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 270 flight time total : 4000 flight time type : 1000 |
| ASRS Report | 535953 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | altitude deviation : overshoot conflict : airborne less severe non adherence : clearance aircraft equipment problem : critical |
| Independent Detector | aircraft equipment : tcas other controllera |
| Resolutory Action | controller : issued alert none taken : anomaly accepted |
| Miss Distance | vertical : 1000 |
| Supplementary | |
| Problem Areas | ATC Human Performance Flight Crew Human Performance |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | other |
Narrative:
On arrival with captain as PF and me as PNF, during descent, we received an RA as ZTL queried our assigned altitude. On the previous center frequency we received vectors and descent clearance, on a congested frequency, and had a company aircraft respond to our radio calls several times. Because of the frequency congestion, we were unable to verify our altitude when ATC queried our altitude and we received the RA. During the flight we had a cockpit jump seat rider who also noticed that the company aircraft was responding to our radio calls. Also, during the flight, the captain was describing the aircraft system to the jump seat rider. His attention was divided, although seemingly focused on talking (showing off) the 'neat' things about the B717-200. During this 'incident' we descended to the altitude I believe we were assigned (I don't remember if it was FL210 or FL220). I should have mentioned to the captain to 'back me up' on the radio more, considering the extreme radio congestion and vectors that we received which seemed out of the ordinary.
Original NASA ASRS Text
Title: B717 FLC OVERSHOT ASSIGNED DSCNT ALT DUE TO FORGETTING ASSIGNED ALT AFTER RESPONDING TO A TCASII RA. FREQ CONGESTION, ANOTHER COMPANY ACFT WITH SIMILAR CALL SIGN RESPONDING TO RPTR'S CLRNC AND THE CAPT BEING DISTR BY CONVERSING WITH THE JUMP SEAT OBSERVER.
Narrative: ON ARR WITH CAPT AS PF AND ME AS PNF, DURING DSCNT, WE RECEIVED AN RA AS ZTL QUERIED OUR ASSIGNED ALT. ON THE PREVIOUS CTR FREQ WE RECEIVED VECTORS AND DSCNT CLRNC, ON A CONGESTED FREQ, AND HAD A COMPANY ACFT RESPOND TO OUR RADIO CALLS SEVERAL TIMES. BECAUSE OF THE FREQ CONGESTION, WE WERE UNABLE TO VERIFY OUR ALT WHEN ATC QUERIED OUR ALT AND WE RECEIVED THE RA. DURING THE FLT WE HAD A COCKPIT JUMP SEAT RIDER WHO ALSO NOTICED THAT THE COMPANY ACFT WAS RESPONDING TO OUR RADIO CALLS. ALSO, DURING THE FLT, THE CAPT WAS DESCRIBING THE ACFT SYS TO THE JUMP SEAT RIDER. HIS ATTN WAS DIVIDED, ALTHOUGH SEEMINGLY FOCUSED ON TALKING (SHOWING OFF) THE 'NEAT' THINGS ABOUT THE B717-200. DURING THIS 'INCIDENT' WE DSNDED TO THE ALT I BELIEVE WE WERE ASSIGNED (I DON'T REMEMBER IF IT WAS FL210 OR FL220). I SHOULD HAVE MENTIONED TO THE CAPT TO 'BACK ME UP' ON THE RADIO MORE, CONSIDERING THE EXTREME RADIO CONGESTION AND VECTORS THAT WE RECEIVED WHICH SEEMED OUT OF THE ORDINARY.
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.