First officer of an medium large transport air carrier aircraft allowed the aircraft to descend below assigned altitude and the floor of the TCA during vectors to final approach.

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Attributes
ACN	251589
Time
Date	199309
Day	Sun
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : dfw
State Reference	TX
Altitude	msl bound lower : 3700 msl bound upper : 4000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : dfw
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other Other
Flight Phase	cruise other descent : approach
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 210 flight time total : 7500 flight time type : 820
ASRS Report	251589
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	airspace violation : exit altitude deviation : excursion from assigned altitude non adherence : clearance other anomaly other other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	none taken : anomaly accepted
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Vectors to visual approach. Cleared to and descending to 4000 ft. Cleared for visual approach as we approached 4000 ft. 4000 ft is floor of TCA in that area. Cautioned first officer to maintain 4000 ft until GS intercept to remain in TCA. I got busy for a second. Crosschecked altimeter, we were at 3700 ft. Cautioned first officer again. We maintained 3700 ft briefly as GS captured. Slight deviation but still a deviation. Based on conversations I've had, many flight crew members are unaware of the far requiring aircraft to stay in TCA when landing at primary airport.

Original NASA ASRS Text

Title: FO OF AN MLG ACR ACFT ALLOWED THE ACFT TO DSND BELOW ASSIGNED ALT AND THE FLOOR OF THE TCA DURING VECTORS TO FINAL APCH.

Narrative: VECTORS TO VISUAL APCH. CLRED TO AND DSNDING TO 4000 FT. CLRED FOR VISUAL APCH AS WE APCHED 4000 FT. 4000 FT IS FLOOR OF TCA IN THAT AREA. CAUTIONED FO TO MAINTAIN 4000 FT UNTIL GS INTERCEPT TO REMAIN IN TCA. I GOT BUSY FOR A SECOND. XCHKED ALTIMETER, WE WERE AT 3700 FT. CAUTIONED FO AGAIN. WE MAINTAINED 3700 FT BRIEFLY AS GS CAPTURED. SLIGHT DEV BUT STILL A DEV. BASED ON CONVERSATIONS I'VE HAD, MANY FLC MEMBERS ARE UNAWARE OF THE FAR REQUIRING ACFT TO STAY IN TCA WHEN LNDG AT PRIMARY ARPT.

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.