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Arriving DC9 flight crew misinterpreted clearance and undershot crossing altitude, requiring them to make a climbing left turn to avoid traffic.
| Attributes | |
| ACN | 489102 |
| Time | |
| Date | 200010 |
| Day | Thu |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| State Reference | MN |
| Altitude | msl bound lower : 11000 msl bound upper : 12000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tower : teb.tower |
| Operator | common carrier : air carrier |
| Make Model Name | DC-9 30 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : intermediate altitude |
| Route In Use | arrival star : kaspr.kaspr 2 |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | tracon : m98.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | B727 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | climbout : intermediate altitude |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : multi engine pilot : instrument pilot : flight engineer pilot : commercial pilot : cfi pilot : atp |
| Experience | flight time last 90 days : 240 flight time total : 9100 flight time type : 1150 |
| ASRS Report | 489102 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : commercial pilot : instrument pilot : multi engine pilot : atp pilot : private |
| Experience | flight time last 90 days : 210 flight time total : 12000 flight time type : 500 |
| ASRS Report | 488957 |
| Events | |
| Anomaly | altitude deviation : crossing restriction not met altitude deviation : undershoot conflict : airborne critical non adherence : clearance non adherence : published procedure other anomaly other |
| Independent Detector | other flight crewa other flight crewb |
| Resolutory Action | controller : issued new clearance flight crew : took precautionary avoidance action |
| Miss Distance | horizontal : 15000 vertical : 1000 |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance |
| Primary Problem | Flight Crew Human Performance |
Narrative:
Flight plan included kasper 2 STAR at msp. Initial check in with msp approach cleared us to cross delzy intersection at 11000 ft and 250 KTS. Approach control then cleared us to 11000 ft which we interpreted as a cancellation of the crossing restr. Msp approach then informed us that we missed our crossing restr and we crossed delzy at approximately 14000 ft. The controller just said to verify the chart and that it wasn't a problem and handed us over to the next msp approach controller. Supplemental information from acn 488957: at 11000 ft we saw a company B727 start turn after takeoff in our direction climbing. We then got a TA then a climbing RA. We turned into the tail of the aircraft and climbed 1000 ft. The controller then issued a turn in the direction we had already started. The controller then asked if we got the frequency change and descent? We had not. In fact, at the time the frequency was rather quiet. Our judgement was we passed beyond 5 mi horizontal and vertical 1000 ft. Factors: a busy approach control frequency, a busy controller and I think he forgot about us until we called departing 11000 ft climbing to honor the RA.
Original NASA ASRS Text
Title: ARRIVING DC9 FLC MISINTERPRETED CLRNC AND UNDERSHOT XING ALT, REQUIRING THEM TO MAKE A CLBING L TURN TO AVOID TFC.
Narrative: FLT PLAN INCLUDED KASPER 2 STAR AT MSP. INITIAL CHK IN WITH MSP APCH CLRED US TO CROSS DELZY INTXN AT 11000 FT AND 250 KTS. APCH CTL THEN CLRED US TO 11000 FT WHICH WE INTERPRETED AS A CANCELLATION OF THE XING RESTR. MSP APCH THEN INFORMED US THAT WE MISSED OUR XING RESTR AND WE CROSSED DELZY AT APPROX 14000 FT. THE CTLR JUST SAID TO VERIFY THE CHART AND THAT IT WASN'T A PROB AND HANDED US OVER TO THE NEXT MSP APCH CTLR. SUPPLEMENTAL INFO FROM ACN 488957: AT 11000 FT WE SAW A COMPANY B727 START TURN AFTER TKOF IN OUR DIRECTION CLBING. WE THEN GOT A TA THEN A CLBING RA. WE TURNED INTO THE TAIL OF THE ACFT AND CLBED 1000 FT. THE CTLR THEN ISSUED A TURN IN THE DIRECTION WE HAD ALREADY STARTED. THE CTLR THEN ASKED IF WE GOT THE FREQ CHANGE AND DSCNT? WE HAD NOT. IN FACT, AT THE TIME THE FREQ WAS RATHER QUIET. OUR JUDGEMENT WAS WE PASSED BEYOND 5 MI HORIZ AND VERT 1000 FT. FACTORS: A BUSY APCH CTL FREQ, A BUSY CTLR AND I THINK HE FORGOT ABOUT US UNTIL WE CALLED DEPARTING 11000 FT CLBING TO HONOR THE RA.
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.