Altitude deviation altitude excursion from assigned. Non adherence to ATC clearance.

Attributes
ACN	316170
Time
Date	199509
Day	Tue
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : anc
State Reference	AK
Altitude	msl bound lower : 7600 msl bound upper : 8000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : anc
Operator	common carrier : air carrier
Make Model Name	B747-C/F
Operating Under FAR Part	Part 121
Navigation In Use	Other
Flight Phase	descent other
Flight Plan	IFR
Aircraft 2
Make Model Name	PA-31 Navajo Chieftan/Mojave/Navajo T1020
Operating Under FAR Part	Part 91
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
ASRS Report	316170
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 100 flight time total : 16550 flight time type : 2400
ASRS Report	316598
Events
Anomaly	altitude deviation : overshoot non adherence : clearance non adherence other other anomaly other
Independent Detector	other controllera other flight crewa
Resolutory Action	flight crew : became reoriented flight crew : returned to intended course or assigned course other
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Descended below assigned altitude. Assigned altitude was 8000 ft. Terminated descent at 7600 ft. Noticed by crew and approach control. Contributing factors: crew fatigue (night freighter) altitude setting in awi (altitude alerter) was not changed from 10000 ft to 8000 ft. Supplemental information from acn 316598: descent was noticed by crew and approach control at approximately 7500 ft MSL. Copilot was flying aircraft by hand with flight director guidance.

Original NASA ASRS Text

Title: ALTDEV ALT EXCURSION FROM ASSIGNED. NON ADHERENCE TO ATC CLRNC.

Narrative: DSNDED BELOW ASSIGNED ALT. ASSIGNED ALT WAS 8000 FT. TERMINATED DSCNT AT 7600 FT. NOTICED BY CREW AND APCH CTL. CONTRIBUTING FACTORS: CREW FATIGUE (NIGHT FREIGHTER) ALT SETTING IN AWI (ALT ALERTER) WAS NOT CHANGED FROM 10000 FT TO 8000 FT. SUPPLEMENTAL INFO FROM ACN 316598: DSCNT WAS NOTICED BY CREW AND APCH CTL AT APPROX 7500 FT MSL. COPLT WAS FLYING ACFT BY HAND WITH FLT DIRECTOR GUIDANCE.

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.