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Flight crew of a B757 were confused on descent request resulting in starting their descent only a short descent prior to the fix after ATC inquired about when they were going to descend. After descending at high rate, ATC stopped their descent for traffic passing below them which they observed on their TCASII.
| Attributes | |
| ACN | 417805 |
| Time | |
| Date | 199810 |
| Day | Tue |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : ard |
| State Reference | PA |
| Altitude | msl bound lower : 23600 msl bound upper : 24000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Dusk |
| Aircraft 1 | |
| Controlling Facilities | artcc : zdc |
| Operator | common carrier : air carrier |
| Make Model Name | B757 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | descent other |
| Route In Use | arrival other arrival star : star enroute airway : j51 |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| ASRS Report | 417805 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument |
| ASRS Report | 417800 |
| Events | |
| Anomaly | altitude deviation : undershoot altitude deviation : crossing restriction not met non adherence : clearance other anomaly other |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued new clearance other |
| Consequence | Other |
| Miss Distance | vertical : 1800 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
First officer, PF, received clearance for somto at 13000 ft and speed 320+ KTS. 5 mi prior to somto, ZNY questioned start of descent. Descent commenced 4.6 mi to somto. Descent required speed brake and speed increase (VV2 and 4500 ft). ZNY directed 180 degree heading and new altitude clearance to FL220. Passing FL238, ZNY directed leveloff to FL240. TCASII alert sounded (VFR condition) with resolution with traffic at approximately FL220. We corrected altitude to FL240, descending no lower than FL236.
Original NASA ASRS Text
Title: FLC OF A B757 WERE CONFUSED ON DSCNT REQUEST RESULTING IN STARTING THEIR DSCNT ONLY A SHORT DSCNT PRIOR TO THE FIX AFTER ATC INQUIRED ABOUT WHEN THEY WERE GOING TO DSND. AFTER DSNDING AT HIGH RATE, ATC STOPPED THEIR DSCNT FOR TFC PASSING BELOW THEM WHICH THEY OBSERVED ON THEIR TCASII.
Narrative: FO, PF, RECEIVED CLRNC FOR SOMTO AT 13000 FT AND SPD 320+ KTS. 5 MI PRIOR TO SOMTO, ZNY QUESTIONED START OF DSCNT. DSCNT COMMENCED 4.6 MI TO SOMTO. DSCNT REQUIRED SPD BRAKE AND SPD INCREASE (VV2 AND 4500 FT). ZNY DIRECTED 180 DEG HDG AND NEW ALT CLRNC TO FL220. PASSING FL238, ZNY DIRECTED LEVELOFF TO FL240. TCASII ALERT SOUNDED (VFR CONDITION) WITH RESOLUTION WITH TFC AT APPROX FL220. WE CORRECTED ALT TO FL240, DSNDING NO LOWER THAN FL236.
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.