Air carrier large transport altitude deviation excursion from clearance altitude. The flight crew started a descent to MDA before crossing the FAF at san.

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Attributes
ACN	192628
Time
Date	199110
Day	Wed
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : san
State Reference	CA
Altitude	msl bound lower : 1800 msl bound upper : 2000
Environment
Flight Conditions	IMC
Light	Night
Aircraft 1
Controlling Facilities	tower : san
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other Other
Flight Phase	descent : approach
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : flight engineer pilot : commercial pilot : atp
Experience	flight time last 90 days : 210 flight time total : 20000 flight time type : 2300
ASRS Report	192628
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 150 flight time total : 20000 flight time type : 2400
ASRS Report	192724
Events
Anomaly	altitude deviation : excursion from assigned altitude non adherence : clearance non adherence : published procedure non adherence : far other spatial deviation
Independent Detector	atc equipment other atc equipment : unspecified
Resolutory Action	other
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Tower called aircraft to warn of a low altitude alert outside the final approach fix. The FMS map mode showed us inside 'reebo' the FAF and therefore we were descending to localizer mins. Tower advised us that we were low. There seemed to be a difference of 2 mi between localizer FAF and FMS FAF. Solution should be 1 pilot must display raw data on HSI for all nonprecision approachs. Supplemental information from acn 192724. Used dir/intc page on FMS to clean up map display. Reebo (the FAF) dropped off the map display and F/a appeared. (F/a is preset fix the computer shows 8 mi from selected runway). Reebo (FAF) is 5.1 mi from runway. We started to MDA 2.9 mi early and the approach controller called it.

Original NASA ASRS Text

Title: ACR LGT ALTDEV EXCURSION FROM CLRNC ALT. THE FLC STARTED A DSCNT TO MDA BEFORE XING THE FAF AT SAN.

Narrative: TWR CALLED ACFT TO WARN OF A LOW ALT ALERT OUTSIDE THE FINAL APCH FIX. THE FMS MAP MODE SHOWED US INSIDE 'REEBO' THE FAF AND THEREFORE WE WERE DSNDING TO LOC MINS. TWR ADVISED US THAT WE WERE LOW. THERE SEEMED TO BE A DIFFERENCE OF 2 MI BTWN LOC FAF AND FMS FAF. SOLUTION SHOULD BE 1 PLT MUST DISPLAY RAW DATA ON HSI FOR ALL NONPRECISION APCHS. SUPPLEMENTAL INFO FROM ACN 192724. USED DIR/INTC PAGE ON FMS TO CLEAN UP MAP DISPLAY. REEBO (THE FAF) DROPPED OFF THE MAP DISPLAY AND F/A APPEARED. (F/A IS PRESET FIX THE COMPUTER SHOWS 8 MI FROM SELECTED RWY). REEBO (FAF) IS 5.1 MI FROM RWY. WE STARTED TO MDA 2.9 MI EARLY AND THE APCH CTLR CALLED IT.

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.