|37000 Feet||Browse and search NASA's
Aviation Safety Reporting System
|Local Time Of Day||0601 To 1200|
|Locale Reference||atc facility : fim|
|Altitude||msl bound lower : 26000|
msl bound upper : 33000
|Controlling Facilities||artcc : zla|
|Operator||general aviation : corporate|
|Make Model Name||Light Transport, Low Wing, 2 Turbojet Eng|
|Flight Phase||descent other|
|Route In Use||arrival other|
|Function||flight crew : captain|
oversight : pic
|Qualification||pilot : atp|
|Experience||flight time last 90 days : 120|
flight time total : 6000
flight time type : 290
|Function||flight crew : first officer|
|Qualification||pilot : instrument|
pilot : commercial
|Anomaly||altitude deviation : overshoot|
non adherence : clearance
other anomaly other
|Independent Detector||other flight crewa|
|Resolutory Action||controller : issued new clearance|
|Primary Problem||ATC Human Performance|
|Air Traffic Incident||Pilot Deviation|
We were cleared from FL350 to FL330 which was acknowledged by copilot. After clearance given controller advised 'maintain 2-5-0 for sep.' copilot thought center meant FL250 and acknowledged, 'roger maintain 250.' captain's (my) attention was diverted at time of last broadcast and upon returning my attention I noticed 250 in altitude select. I questioned copilot who was sure we were cleared to FL250. Our policy is to resolve crew questions with verification from ATC. We were going to call ATC when ATC called us and said we were cleared to FL290. We were going through FL290 and advised him we were cleared to FL250. He said, 'roger, cleared to 250.' problem could have been corrected by making standard calls, such as 'maintain airspeed 250,' or give us 'maintain 250 KTS, maintain FL330.' our perception was that as we were close to fillmore VOR we would get a quick descent to cross tandy at 14000'. Our crew will mutually understand and acknowledge altitude changes in the future. All crew callbacks to ATC will confirm either KTS or altitude with the speed or flight level.
Original NASA ASRS Text
Title: LTT OVERSHOT ALT INTENDED BY ARTCC DURING DESCENT.
Narrative: WE WERE CLRED FROM FL350 TO FL330 WHICH WAS ACKNOWLEDGED BY COPLT. AFTER CLRNC GIVEN CTLR ADVISED 'MAINTAIN 2-5-0 FOR SEP.' COPLT THOUGHT CENTER MEANT FL250 AND ACKNOWLEDGED, 'ROGER MAINTAIN 250.' CAPT'S (MY) ATTN WAS DIVERTED AT TIME OF LAST BROADCAST AND UPON RETURNING MY ATTN I NOTICED 250 IN ALT SELECT. I QUESTIONED COPLT WHO WAS SURE WE WERE CLRED TO FL250. OUR POLICY IS TO RESOLVE CREW QUESTIONS WITH VERIFICATION FROM ATC. WE WERE GOING TO CALL ATC WHEN ATC CALLED US AND SAID WE WERE CLRED TO FL290. WE WERE GOING THROUGH FL290 AND ADVISED HIM WE WERE CLRED TO FL250. HE SAID, 'ROGER, CLRED TO 250.' PROB COULD HAVE BEEN CORRECTED BY MAKING STANDARD CALLS, SUCH AS 'MAINTAIN AIRSPD 250,' OR GIVE US 'MAINTAIN 250 KTS, MAINTAIN FL330.' OUR PERCEPTION WAS THAT AS WE WERE CLOSE TO FILLMORE VOR WE WOULD GET A QUICK DSCNT TO CROSS TANDY AT 14000'. OUR CREW WILL MUTUALLY UNDERSTAND AND ACKNOWLEDGE ALT CHANGES IN THE FUTURE. ALL CREW CALLBACKS TO ATC WILL CONFIRM EITHER KTS OR ALT WITH THE SPD OR FLT LEVEL.
Data retrieved from NASA's ASRS site as of August 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.