Air carrier flight crew descends too early on approach to ama in IMC conditions, and violates prohib...

Attributes
ACN	463586
Time
Date	200002
Day	Thu
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : ama.airport
State Reference	TX
Altitude	msl single value : 4265
Environment
Flight Conditions	Mixed
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Small Transport
Operating Under FAR Part	Part 121
Navigation In Use	ils localizer & glide slope : 22
Flight Phase	descent : approach
Route In Use	approach : instrument precision
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 200 flight time total : 8500 flight time type : 3000
ASRS Report	463586
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : multi engine pilot : instrument pilot : commercial
Events
Anomaly	airspace violation : entry altitude deviation : crossing restriction not met altitude deviation : excursion from assigned altitude non adherence : clearance non adherence : far non adherence : published procedure
Independent Detector	other controllera
Resolutory Action	none taken : anomaly accepted
Consequence	faa : reviewed incident with flight crew
Supplementary
Problem Areas	Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

While on the lda DME approach to runway 22 we were cleared to intercept and cleared for the approach. Told to maintain 5000 ft until established. We were established and descended to MDA. ATC called and said we were too low because of a prohibited area on the approach, we need to be at 5000 ft. Why did approach not inform us of this problem?

Original NASA ASRS Text

Title: ACR FLC DSNDS TOO EARLY ON APCH TO AMA IN IMC CONDITIONS, AND VIOLATES PROHIBITED AREA.

Narrative: WHILE ON THE LDA DME APCH TO RWY 22 WE WERE CLRED TO INTERCEPT AND CLRED FOR THE APCH. TOLD TO MAINTAIN 5000 FT UNTIL ESTABLISHED. WE WERE ESTABLISHED AND DSNDED TO MDA. ATC CALLED AND SAID WE WERE TOO LOW BECAUSE OF A PROHIBITED AREA ON THE APCH, WE NEED TO BE AT 5000 FT. WHY DID APCH NOT INFORM US OF THIS PROB?

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.

Air carrier flight crew descends too early on approach to ama in IMC conditions, and violates prohibited area.