|37000 Feet||Browse and search NASA's
Aviation Safety Reporting System
|Local Time Of Day||0601 To 1200|
|Locale Reference||airport : lex|
|Altitude||msl bound lower : 11800|
msl bound upper : 12000
|Controlling Facilities||tracon : ind|
|Operator||general aviation : personal|
|Make Model Name||Small Transport, Low Wing, 2 Turbojet Eng|
|Flight Phase||cruise other|
|Function||flight crew : single pilot|
|Qualification||pilot : private|
pilot : instrument
|Experience||flight time last 90 days : 50|
flight time total : 12200
flight time type : 200
|Affiliation||government : faa|
|Function||controller : approach|
|Qualification||controller : radar|
|Anomaly||altitude deviation : overshoot|
non adherence : clearance
|Independent Detector||other controllera|
other other : unspecified cockpit
|Resolutory Action||none taken : anomaly accepted|
|Consequence||faa : reviewed incident with flight crew|
|Primary Problem||Flight Crew Human Performance|
|Air Traffic Incident||Pilot Deviation|
I had been cleared to descend to 11000' 20 mi east of lex VOR. I was flying with autoplt coupled. I selected 11000', pushed the altitude select button and started my descent. Controller form ind ATC reported traffic at 11000' at my 1 O'clock position and asked if amend my altitude to 12000'. I entered 12000' into my computer and engaged the altitude select once again. Also changed my pitch control indicator. Unbeknown to me my pitch controller indicator shut off my altitude select. I was performing my descent, checklist at the time. I then visually saw the twin engine traffic that was previously called out. I verified I had him in sight. The aircraft autoplt allowed the aircraft to descend to approximately 11800', before I noticed the altitude select button was off. I manually disengaged the autoplt and returned aircraft to 12000'. I landed in lex, then later flew to atl where I was informed to contact ind approach.
Original NASA ASRS Text
Title: PLT OF SMT TWIN JET EXCURSIONED FROM ASSIGNED ALT.
Narrative: I HAD BEEN CLRED TO DSND TO 11000' 20 MI E OF LEX VOR. I WAS FLYING WITH AUTOPLT COUPLED. I SELECTED 11000', PUSHED THE ALT SELECT BUTTON AND STARTED MY DSNT. CTLR FORM IND ATC RPTED TFC AT 11000' AT MY 1 O'CLOCK POS AND ASKED IF AMEND MY ALT TO 12000'. I ENTERED 12000' INTO MY COMPUTER AND ENGAGED THE ALT SELECT ONCE AGAIN. ALSO CHANGED MY PITCH CONTROL INDICATOR. UNBEKNOWN TO ME MY PITCH CTLR INDICATOR SHUT OFF MY ALT SELECT. I WAS PERFORMING MY DSNT, CHKLIST AT THE TIME. I THEN VISUALLY SAW THE TWIN ENG TFC THAT WAS PREVIOUSLY CALLED OUT. I VERIFIED I HAD HIM IN SIGHT. THE ACFT AUTOPLT ALLOWED THE ACFT TO DSND TO APPROX 11800', BEFORE I NOTICED THE ALT SELECT BUTTON WAS OFF. I MANUALLY DISENGAGED THE AUTOPLT AND RETURNED ACFT TO 12000'. I LANDED IN LEX, THEN LATER FLEW TO ATL WHERE I WAS INFORMED TO CONTACT IND APCH.
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.