Medium large transport on visual approach informed they had descended below TCA floor.

Attributes
ACN	127027
Time
Date	198911
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : mzb
State Reference	CA
Altitude	msl bound lower : 5600 msl bound upper : 5600
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	tracon : san
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	descent : approach
Route In Use	approach : visual
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : commercial pilot : atp pilot : instrument
Experience	flight time last 90 days : 210 flight time total : 7000 flight time type : 4000
ASRS Report	127027
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	other anomaly other
Independent Detector	other controllera
Resolutory Action	none taken : detected after the fact
Consequence	Other
Supplementary
Primary Problem	Ambiguous
Air Traffic Incident	other

Narrative:

We were cleared for a visibility approach runway 27 at sad by approach control. We followed the current TCA chart for that area, but nonetheless were informed we had descended below the floor of the TCA. We (both first officer and I) disagreed with the call.

Original NASA ASRS Text

Title: MLG ON VISUAL APCH INFORMED THEY HAD DESCENDED BELOW TCA FLOOR.

Narrative: WE WERE CLRED FOR A VIS APCH RWY 27 AT SAD BY APCH CTL. WE FOLLOWED THE CURRENT TCA CHART FOR THAT AREA, BUT NONETHELESS WERE INFORMED WE HAD DSNDED BELOW THE FLOOR OF THE TCA. WE (BOTH F/O AND I) DISAGREED WITH THE CALL.

Data retrieved from NASA's ASRS site as of August 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.