Atx descent below crossing restr while on approach.

Attributes
ACN	293090
Time
Date	199501
Day	Mon
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : mqo
State Reference	CA
Altitude	msl bound lower : 1700 msl bound upper : 2300
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : sbp
Operator	common carrier : air taxi
Make Model Name	Light Transport, Low Wing, 2 Turboprop Eng
Flight Phase	descent : approach
Flight Plan	IFR
Person 1
Affiliation	company : air taxi
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 240 flight time total : 2700 flight time type : 800
ASRS Report	293090
Person 2
Affiliation	company : air taxi
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	altitude deviation : crossing restriction not met non adherence : published procedure 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:

On approach in to sbp while flying the localizer ii, I was the PF. Since there is no DME on the localizer approach we were using cross radials from the mqo VOR to identify step-down fixes. During the approach the PNF misidented dobra and we initiated a descent from 2300 ft. Once this mistake was realized we initiated a climb back to 2300 ft. We descended to approximately 1700 ft before corrective action was initiated.

Original NASA ASRS Text

Title: ATX DSCNT BELOW XING RESTR WHILE ON APCH.

Narrative: ON APCH IN TO SBP WHILE FLYING THE LOC II, I WAS THE PF. SINCE THERE IS NO DME ON THE LOC APCH WE WERE USING CROSS RADIALS FROM THE MQO VOR TO IDENT STEP-DOWN FIXES. DURING THE APCH THE PNF MISIDENTED DOBRA AND WE INITIATED A DSCNT FROM 2300 FT. ONCE THIS MISTAKE WAS REALIZED WE INITIATED A CLB BACK TO 2300 FT. WE DSNDED TO APPROX 1700 FT BEFORE CORRECTIVE ACTION WAS INITIATED.

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.