EMB120 altitude deviation on approach to fat.

Attributes
ACN	458180
Time
Date	199912
Day	Tue
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : fat.airport
State Reference	CA
Altitude	msl bound lower : 1700 msl bound upper : 2300
Environment
Flight Conditions	Mixed
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : fat.tracon tracon : p31.tracon
Operator	common carrier : air carrier
Make Model Name	Brasilia EMB-120 All Series
Operating Under FAR Part	Part 121
Navigation In Use	ils localizer & glide slope : 29r
Flight Phase	descent : approach
Route In Use	arrival star : altta 6
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : multi engine pilot : cfi pilot : atp pilot : commercial
Experience	flight time last 90 days : 270 flight time total : 5100 flight time type : 1300
ASRS Report	458180
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	altitude deviation : overshoot non adherence : published procedure non adherence : clearance
Independent Detector	other flight crewa
Resolutory Action	flight crew : became reoriented none taken : detected after the fact
Supplementary
Problem Areas	Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Altta 6 arrival cleared for approach. Approach plate indicates leveloff at 2300 ft until stori, then down to 1700 ft. We descended through 2300 ft to 1700 ft. We overlooked the stepdown and focused on GS intercept of 1700 ft.

Original NASA ASRS Text

Title: EMB120 ALTDEV ON APCH TO FAT.

Narrative: ALTTA 6 ARR CLRED FOR APCH. APCH PLATE INDICATES LEVELOFF AT 2300 FT UNTIL STORI, THEN DOWN TO 1700 FT. WE DSNDED THROUGH 2300 FT TO 1700 FT. WE OVERLOOKED THE STEPDOWN AND FOCUSED ON GS INTERCEPT OF 1700 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.