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37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
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DC9-30. PF, first officer, misunderstood cleared altitude and was continuing descent through the assigned 6000 ft. TCASII alerted to an aircraft at 5000 ft when reporter was descending through 5700 ft. Flight crew took evasive action and climbed out of TCASII RA. When traffic alert first alerted flight crew, they were looking out to make visual contact and descended through assigned.
| Attributes | |
| ACN | 346500 |
| Time | |
| Date | 199609 |
| Day | Fri |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : pit |
| State Reference | PA |
| Altitude | msl bound lower : 5700 msl bound upper : 6500 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : pit tracon : lax |
| Operator | common carrier : air carrier |
| Make Model Name | DC-9 30 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 200 flight time total : 10000 |
| ASRS Report | 346500 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : flight engineer pilot : cfi pilot : atp |
| Experience | flight time last 90 days : 300 flight time total : 10000 flight time type : 3000 |
| ASRS Report | 346564 |
| Events | |
| Anomaly | altitude deviation : overshoot conflict : airborne less severe non adherence : clearance other anomaly other |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : took evasive action |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Descent to 6000 ft heading 220 degrees. First officer understood a turn to 270 degrees and descent, thought to 4000 ft. Disconnecting autoplt and started a turn! At this time, captain noted aircraft at 800 ft below our aircraft, first officer diverted attention outside to make visual contact with aircraft. Captain then noted we were descending just as TCASII issued a 'climb' alert. We climbed to 6500 ft before returning to 6000 ft.
Original NASA ASRS Text
Title: DC9-30. PF, FO, MISUNDERSTOOD CLRED ALT AND WAS CONTINUING DSCNT THROUGH THE ASSIGNED 6000 FT. TCASII ALERTED TO AN ACFT AT 5000 FT WHEN RPTR WAS DSNDING THROUGH 5700 FT. FLC TOOK EVASIVE ACTION AND CLBED OUT OF TCASII RA. WHEN TFC ALERT FIRST ALERTED FLC, THEY WERE LOOKING OUT TO MAKE VISUAL CONTACT AND DSNDED THROUGH ASSIGNED.
Narrative: DSCNT TO 6000 FT HDG 220 DEGS. FO UNDERSTOOD A TURN TO 270 DEGS AND DSCNT, THOUGHT TO 4000 FT. DISCONNECTING AUTOPLT AND STARTED A TURN! AT THIS TIME, CAPT NOTED ACFT AT 800 FT BELOW OUR ACFT, FO DIVERTED ATTN OUTSIDE TO MAKE VISUAL CONTACT WITH ACFT. CAPT THEN NOTED WE WERE DSNDING JUST AS TCASII ISSUED A 'CLB' ALERT. WE CLBED TO 6500 FT BEFORE RETURNING TO 6000 FT.
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.