A descending MD90, while on the localizer on approach to san, overshoots its initial altitude.

Attributes
ACN	437840
Time
Date	199905
Day	Tue
Local Time Of Day	1801 To 2400
Place
Locale Reference	intersection : reebo
State Reference	CA
Altitude	msl bound lower : 1850 msl bound upper : 2000
Environment
Flight Conditions	IMC
Light	Night
Aircraft 1
Controlling Facilities	tracon : sct.tracon
Operator	common carrier : air carrier
Make Model Name	MD-90 Series (DC-9-90) Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	ils localizer only : 27 other
Flight Phase	descent : approach
Route In Use	approach : instrument non precision
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : multi engine pilot : instrument pilot : commercial
Experience	flight time last 90 days : 210 flight time total : 6000
ASRS Report	437840
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	altitude deviation : overshoot non adherence : clearance
Independent Detector	atc equipment : msaw other controllera other flight crewa
Resolutory Action	controller : issued advisory flight crew : returned to original clearance
Supplementary
Problem Areas	Aircraft Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

On descent to cross reebo at 2000 ft the aircraft descended 150 ft low. Approach control advised us that a low altitude warning had gone off. We had already corrected back up the 150 ft to 2000 ft.

Original NASA ASRS Text

Title: A DSNDING MD90, WHILE ON THE LOC ON APCH TO SAN, OVERSHOOTS ITS INITIAL ALT.

Narrative: ON DSCNT TO CROSS REEBO AT 2000 FT THE ACFT DSNDED 150 FT LOW. APCH CTL ADVISED US THAT A LOW ALT WARNING HAD GONE OFF. WE HAD ALREADY CORRECTED BACK UP THE 150 FT TO 2000 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.