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Non compliance with altitude awareness protocol leads to the mode control panel being set for an incorrect altitude ending in an overshoot.
| Attributes | |
| ACN | 527650 |
| Time | |
| Date | 200110 |
| Day | Mon |
| Place | |
| Locale Reference | airport : phl.airport |
| State Reference | PA |
| Altitude | msl bound lower : 24000 msl bound upper : 25000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | B737-500 |
| Flight Phase | descent : intermediate altitude ground : maintenance |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp pilot : cfi pilot : multi engine |
| Experience | flight time last 90 days : 200 flight time total : 7000 flight time type : 1400 |
| ASRS Report | 527650 |
| Events | |
| Anomaly | altitude deviation : overshoot non adherence : published procedure non adherence : clearance |
| Resolutory Action | controller : issued advisory |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
During descent to phl, center cleared us to FL250. The captain immediately started programming the FMC for the descent, but did not set the mode control panel. After a min I told him to set the MCP and I said, 'I thought we were cleared to FL240.' he said, 'we were' and I thought he was positive about the clearance. The controller told us after we descended through FL250 that we were only cleared to FL250. In hindsight I should have asked the controller what the assigned altitude was even though the captain said he was sure.
Original NASA ASRS Text
Title: NON COMPLIANCE WITH ALT AWARENESS PROTOCOL LEADS TO THE MODE CONTROL PANEL BEING SET FOR AN INCORRECT ALT ENDING IN AN OVERSHOOT.
Narrative: DURING DSCNT TO PHL, CENTER CLEARED US TO FL250. THE CAPT IMMEDIATELY STARTED PROGRAMMING THE FMC FOR THE DSCNT, BUT DID NOT SET THE MODE CONTROL PANEL. AFTER A MIN I TOLD HIM TO SET THE MCP AND I SAID, 'I THOUGHT WE WERE CLEARED TO FL240.' HE SAID, 'WE WERE' AND I THOUGHT HE WAS POSITIVE ABOUT THE CLRNC. THE CTLR TOLD US AFTER WE DSNDED THROUGH FL250 THAT WE WERE ONLY CLEARED TO FL250. IN HINDSIGHT I SHOULD HAVE ASKED THE CTLR WHAT THE ASSIGNED ALT WAS EVEN THOUGH THE CAPT SAID HE WAS SURE.
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.