|37000 Feet||Browse and search NASA's
Aviation Safety Reporting System
|Local Time Of Day||1201 To 1800|
|Locale Reference||navaid : sav.vortac|
|Altitude||msl bound lower : 34000|
msl bound upper : 37000
|Operator||common carrier : air carrier|
|Make Model Name||B737-700|
|Flight Phase||cruise : enroute altitude change|
|Route In Use||enroute : on vectors|
|Affiliation||company : air carrier|
|Function||flight crew : captain|
oversight : pic
|Qualification||pilot : atp|
|Experience||flight time last 90 days : 250|
flight time total : 10080
flight time type : 6060
|Anomaly||altitude deviation : excursion from assigned altitude|
other anomaly other
|Resolutory Action||controller : issued alert|
controller : issued new clearance
none taken : detected after the fact
|Problem Areas||ATC Human Performance|
Flight Crew Human Performance
While en route from isp to jax, we were given vectors off course and told to slow as much as possible for spacing into jax. We were level at FL370. We heard ZJX give us a descent to FL250. The first officer read back 'descend to FL250' and set it in the altitude window on the MCP. I repeated what I heard, 'descend to FL250' and verified that it was set in the altitude window and commenced a 1000 FPM rate of descent. While passing through FL345, the controller told us to climb back to FL350. I verified that altitude and climbed back up. Nothing else was said of this incident and we proceeded on to jax. This must have been my mistake, but all the procedures were complied with. I just need to listen more carefully.
Original NASA ASRS Text
Title: B737-700 CREW HAD AN ALTDEV IN ZJC CLASS A AIRSPACE.
Narrative: WHILE ENRTE FROM ISP TO JAX, WE WERE GIVEN VECTORS OFF COURSE AND TOLD TO SLOW AS MUCH AS POSSIBLE FOR SPACING INTO JAX. WE WERE LEVEL AT FL370. WE HEARD ZJX GIVE US A DSCNT TO FL250. THE FO READ BACK 'DSND TO FL250' AND SET IT IN THE ALT WINDOW ON THE MCP. I REPEATED WHAT I HEARD, 'DSND TO FL250' AND VERIFIED THAT IT WAS SET IN THE ALT WINDOW AND COMMENCED A 1000 FPM RATE OF DSCNT. WHILE PASSING THROUGH FL345, THE CTLR TOLD US TO CLB BACK TO FL350. I VERIFIED THAT ALT AND CLBED BACK UP. NOTHING ELSE WAS SAID OF THIS INCIDENT AND WE PROCEEDED ON TO JAX. THIS MUST HAVE BEEN MY MISTAKE, BUT ALL THE PROCS WERE COMPLIED WITH. I JUST NEED TO LISTEN MORE CAREFULLY.
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.