An EMB120 flight crew misinterps their clearance and overshoots their assigned altitude while 15 mi ...

Attributes
ACN	475500
Time
Date	200006
Day	Sun
Local Time Of Day	1201 To 1800
Place
Locale Reference	navaid : lhs.vortac
State Reference	CA
Altitude	msl bound lower : 12200 msl bound upper : 1300
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zla.artcc
Operator	common carrier : air carrier
Operating Under FAR Part	Part 119
Navigation In Use	other vortac
Route In Use	arrival other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : multi engine pilot : cfi
Experience	flight time last 90 days : 100 flight time total : 3700 flight time type : 1800
ASRS Report	475500
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : multi engine pilot : commercial pilot : instrument pilot : cfi
Events
Anomaly	altitude deviation : overshoot non adherence : clearance other anomaly other
Independent Detector	other controllera
Resolutory Action	controller : issued advisory flight crew : returned to assigned altitude
Consequence	faa : reviewed incident with flight crew
Supplementary
Problem Areas	Environmental Factor Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

ZLA instructed us to descend to cross 12 mi south of lhs at 12000 ft. As we descended through 12200 ft center informed us we were assigned 13000 ft. Both the first officer and I agreed we heard 12000 ft assigned and I read back 12000 ft. A factor might have been my fatigue. I had been working since XA00 and was assigned an additional round trip by scheduling. Another factor was the inexperience of my first officer. He had only worked for us for a few months. Most of our new first officer's come from flight instructor only backgrounds, and are very 'green.'

Original NASA ASRS Text

Title: AN EMB120 FLC MISINTERPS THEIR CLRNC AND OVERSHOOTS THEIR ASSIGNED ALT WHILE 15 MI NW OF LHS, CA.

Narrative: ZLA INSTRUCTED US TO DSND TO CROSS 12 MI S OF LHS AT 12000 FT. AS WE DSNDED THROUGH 12200 FT CTR INFORMED US WE WERE ASSIGNED 13000 FT. BOTH THE FO AND I AGREED WE HEARD 12000 FT ASSIGNED AND I READ BACK 12000 FT. A FACTOR MIGHT HAVE BEEN MY FATIGUE. I HAD BEEN WORKING SINCE XA00 AND WAS ASSIGNED AN ADDITIONAL ROUND TRIP BY SCHEDULING. ANOTHER FACTOR WAS THE INEXPERIENCE OF MY FO. HE HAD ONLY WORKED FOR US FOR A FEW MONTHS. MOST OF OUR NEW FO'S COME FROM FLT INSTRUCTOR ONLY BACKGROUNDS, AND ARE VERY 'GREEN.'

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.

An EMB120 flight crew misinterps their clearance and overshoots their assigned altitude while 15 mi northwest of lhs, ca.