Altitude deviation.

Attributes
ACN	289818
Time
Date	199411
Day	Sun
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : oxi airport : ord
State Reference	IL
Altitude	msl bound lower : 12200 msl bound upper : 13000
Environment
Flight Conditions	VMC
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 other
Route In Use	enroute airway : zau
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : flight engineer pilot : atp
Experience	flight time last 90 days : 220 flight time total : 9000 flight time type : 800
ASRS Report	289818
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	altitude deviation : excursion from assigned altitude altitude deviation : overshoot non adherence : clearance non adherence other other anomaly other
Independent Detector	other controllera
Resolutory Action	flight crew : became reoriented flight crew : returned to intended course or assigned course other
Consequence	faa : reviewed incident with flight crew
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Holding off and on for ord. Descended from FL230 to 13000 ft to hold at halie intersection. Due to a distraction from flight attendant, we neglected to reset altimeters passing FL180 from 29.92 to 29.20. Extremely low pressure caused us to be at 12200 ft when we thought we were at 13000 ft. Controller queried us, we realized our error and climbed to 13000 ft after resetting altimeter. We didn't accomplish the approach descent checklist on descent, which would have prevented this.

Original NASA ASRS Text

Title: ALTDEV.

Narrative: HOLDING OFF AND ON FOR ORD. DSNDED FROM FL230 TO 13000 FT TO HOLD AT HALIE INTXN. DUE TO A DISTR FROM FLT ATTENDANT, WE NEGLECTED TO RESET ALTIMETERS PASSING FL180 FROM 29.92 TO 29.20. EXTREMELY LOW PRESSURE CAUSED US TO BE AT 12200 FT WHEN WE THOUGHT WE WERE AT 13000 FT. CTLR QUERIED US, WE REALIZED OUR ERROR AND CLBED TO 13000 FT AFTER RESETTING ALTIMETER. WE DIDN'T ACCOMPLISH THE APCH DSCNT CHKLIST ON DSCNT, WHICH WOULD HAVE PREVENTED THIS.

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.