Widebody transport cleared to 6000 ft, descended to 5720 ft.

Attributes
ACN	353820
Time
Date	199611
Day	Sun
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : osi
State Reference	CA
Altitude	msl bound lower : 5720 msl bound upper : 6000
Environment
Flight Conditions	VMC
Light	Dawn
Aircraft 1
Controlling Facilities	tracon : oak tower : sfo
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	cruise other descent other
Route In Use	arrival other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : cfi pilot : atp pilot : commercial pilot : instrument pilot : flight engineer
Experience	flight time last 90 days : 195 flight time total : 15700 flight time type : 917
ASRS Report	353820
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	altitude deviation : overshoot
Independent Detector	other flight crewa
Resolutory Action	flight crew : returned to intended course or assigned course
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Descending from 8000-6000 ft, 240 KTS. Approach cleared us to descend to 4000 ft after crossing the VOR. Extremely tired crew after all night flight from sydney, approximately 15 hours. I heard clearance and repeated it to myself and was simply concentrating on flying aircraft (it was on autoplt) and descended through 6000 ft to about 5720 ft before climbing back to 6000 ft. Flying all night, lack of sleep, and tiredness all contribute to these sits. This was an augmented crew (4 pilots) and none of us caught this error.

Original NASA ASRS Text

Title: WDB CLRED TO 6000 FT, DSNDED TO 5720 FT.

Narrative: DSNDING FROM 8000-6000 FT, 240 KTS. APCH CLRED US TO DSND TO 4000 FT AFTER XING THE VOR. EXTREMELY TIRED CREW AFTER ALL NIGHT FLT FROM SYDNEY, APPROX 15 HRS. I HEARD CLRNC AND REPEATED IT TO MYSELF AND WAS SIMPLY CONCENTRATING ON FLYING ACFT (IT WAS ON AUTOPLT) AND DSNDED THROUGH 6000 FT TO ABOUT 5720 FT BEFORE CLBING BACK TO 6000 FT. FLYING ALL NIGHT, LACK OF SLEEP, AND TIREDNESS ALL CONTRIBUTE TO THESE SITS. THIS WAS AN AUGMENTED CREW (4 PLTS) AND NONE OF US CAUGHT THIS ERROR.

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.