Altitude deviation on descent. Flight crew misread altimeter.

Attributes
ACN	342530
Time
Date	199607
Day	Tue
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : zdc
State Reference	DC
Altitude	msl bound lower : 11000 msl bound upper : 11999
Environment
Flight Conditions	Mixed
Light	Night
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	descent other
Route In Use	enroute airway : zdc
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : cfi pilot : commercial pilot : flight engineer pilot : instrument pilot : atp
Experience	flight time last 90 days : 200 flight time total : 14000 flight time type : 8000
ASRS Report	342530
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	altitude deviation : crossing restriction not met altitude deviation : undershoot non adherence : clearance
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:

Busy talking about course problem a few mins earlier. Clearance was holey at 11000 ft. Altimeter read 11990 ft. We caught the error just past holey. Noticed few days later clrncs issued now read holey 11000 ft or above, robinsville at 8000 ft.

Original NASA ASRS Text

Title: ALTDEV ON DSCNT. FLC MISREAD ALTIMETER.

Narrative: BUSY TALKING ABOUT COURSE PROB A FEW MINS EARLIER. CLRNC WAS HOLEY AT 11000 FT. ALTIMETER READ 11990 FT. WE CAUGHT THE ERROR JUST PAST HOLEY. NOTICED FEW DAYS LATER CLRNCS ISSUED NOW READ HOLEY 11000 FT OR ABOVE, ROBINSVILLE AT 8000 FT.

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.