 |
37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
|
Air carrier X unauthorized descent to wrong altitude. Pilot deviation. Controller failed to hear readback of descent to wrong assigned altitude. Operational deviation.
| Attributes | |
| ACN | 187947 |
| Time | |
| Date | 199108 |
| Day | Sat |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : bwi |
| State Reference | MD |
| Altitude | msl bound lower : 10000 msl bound upper : 11000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | tracon : iad |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | descent other |
| Route In Use | arrival star : star |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : approach |
| Qualification | controller : radar |
| Experience | controller radar : 6 |
| ASRS Report | 187947 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | altitude deviation : overshoot non adherence : published procedure non adherence : clearance |
| Independent Detector | other controllera |
| Resolutory Action | none taken : detected after the fact |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Operational Deviation Pilot Deviation |
Narrative:
Air carrier X checked in descending to 150 in vicinity of mumsy intersection on EMI1 arrival to bwi. Aircraft was subsequently issued a clearance to 'cross ruane intersection at and maintain 110 speed your discretion.' pilot was switched to balance approach prior to ruane and was later observed descending to 100. I checked with balance and the controller said the pilot thought assigned altitude was 100. I did not hear the readback because I was having a casual conversation with a visiting center controller at the time.
Original NASA ASRS Text
Title: ACR X UNAUTH DSCNT TO WRONG ALT. PLTDEV. CTLR FAILED TO HEAR READBACK OF DSCNT TO WRONG ASSIGNED ALT. OPDEV.
Narrative: ACR X CHKED IN DSNDING TO 150 IN VICINITY OF MUMSY INTXN ON EMI1 ARR TO BWI. ACFT WAS SUBSEQUENTLY ISSUED A CLRNC TO 'CROSS RUANE INTXN AT AND MAINTAIN 110 SPD YOUR DISCRETION.' PLT WAS SWITCHED TO BAL APCH PRIOR TO RUANE AND WAS LATER OBSERVED DSNDING TO 100. I CHKED WITH BAL AND THE CTLR SAID THE PLT THOUGHT ASSIGNED ALT WAS 100. I DID NOT HEAR THE READBACK BECAUSE I WAS HAVING A CASUAL CONVERSATION WITH A VISITING CENTER CTLR AT THE TIME.
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.