Flight crew of a B737-300 descended below assigned altitude into overlapping class D airspace during a visual approach. The tower controller intervened to remind the crew of assigned altitude to which the reporter responded to immediately by regaining assigned altitude.

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Attributes
ACN	432623
Time
Date	199903
Day	Thu
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : tpa.airport
State Reference	FL
Altitude	msl bound lower : 2400 msl bound upper : 2600
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : tpa.tower
Operator	common carrier : air carrier
Make Model Name	B737-300
Operating Under FAR Part	Part 121
Navigation In Use	ils localizer only : 36l
Flight Phase	descent : approach descent : intermediate altitude
Route In Use	approach : visual
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : instrument pilot : flight engineer pilot : commercial pilot : atp pilot : multi engine
Experience	flight time last 90 days : 240 flight time total : 13000 flight time type : 6200
ASRS Report	432623
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument pilot : multi engine
Events
Anomaly	airspace violation : entry altitude deviation : excursion from assigned altitude non adherence : clearance
Independent Detector	other controllera
Resolutory Action	controller : issued alert flight crew : exited penetrated airspace
Supplementary
Problem Areas	Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

The flight was from phl-tpa. Tpa approach control cleared us for a visual approach to runway 36L with a restr to remain at 2600 ft till north of mcdill airport. We were on a right downwind for runway 36L. Our base turn was north of mcdill. We started descending onto the localizer from 2600 ft. At about 2400 ft the tower controller told us to 'maintain 2600 ft till north and west of mcdill.' we climbed back to 2600 ft, went west of the localizer the reintercept from the west. We landed runway 36L without further confusion.

Original NASA ASRS Text

Title: FLC OF A B737-300 DSNDED BELOW ASSIGNED ALT INTO OVERLAPPING CLASS D AIRSPACE DURING A VISUAL APCH. THE TWR CTLR INTERVENED TO REMIND THE CREW OF ASSIGNED ALT TO WHICH THE RPTR RESPONDED TO IMMEDIATELY BY REGAINING ASSIGNED ALT.

Narrative: THE FLT WAS FROM PHL-TPA. TPA APCH CTL CLRED US FOR A VISUAL APCH TO RWY 36L WITH A RESTR TO REMAIN AT 2600 FT TILL N OF MCDILL ARPT. WE WERE ON A R DOWNWIND FOR RWY 36L. OUR BASE TURN WAS N OF MCDILL. WE STARTED DSNDING ONTO THE LOC FROM 2600 FT. AT ABOUT 2400 FT THE TWR CTLR TOLD US TO 'MAINTAIN 2600 FT TILL N AND W OF MCDILL.' WE CLBED BACK TO 2600 FT, WENT W OF THE LOC THE REINTERCEPT FROM THE W. WE LANDED RWY 36L WITHOUT FURTHER CONFUSION.

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.