Military C130 trainee descended prematurely during a non precision practice approach causing the training captain to take control of the aircraft and climb back to initial approach altitude. Near the same time, approach controller queried their altitude.

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Attributes
ACN	477410
Time
Date	200006
Day	Fri
Local Time Of Day	0601 To 1200
Place
State Reference	LA
Altitude	msl bound lower : 1650 msl bound upper : 2000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	other
Make Model Name	Hercules (C-130)
Operating Under FAR Part	Part 91
Route In Use	approach : instrument non precision
Flight Plan	IFR
Aircraft 2
Flight Phase	descent : approach
Route In Use	arrival : on vectors
Person 1
Affiliation	government : military
Function	flight crew : captain instruction : instructor oversight : pic
Qualification	pilot : military pilot : atp
Experience	flight time last 90 days : 200 flight time total : 3000 flight time type : 1900
ASRS Report	477410
Person 2
Affiliation	government : military
Function	flight crew : first officer instruction : trainee
Qualification	pilot : military
Events
Anomaly	altitude deviation : overshoot non adherence : published procedure
Independent Detector	aircraft equipment other aircraft equipment : altimeter other flight crewa
Resolutory Action	controller : issued alert flight crew : returned to assigned altitude none taken : anomaly accepted
Supplementary
Problem Areas	Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

The pilot under instruction, being cleared for the approach, began a descent when he thought he was on a published segment of the nbg tac 22. However, his CDI was bugged improperly from the previous approach at a nearby airport (lakefront). When I, as the instructor, took controls we had already descended to 1650 ft MSL (approximately 350 ft low). ATC queried our altitude. The biggest problem was time compression due to multiple approachs to multiple fields within close proximity. We should have had more of a straight-in to get set up -- blame on us and ATC.

Original NASA ASRS Text

Title: MIL C130 TRAINEE DSNDED PREMATURELY DURING A NON PRECISION PRACTICE APCH CAUSING THE TRAINING CAPT TO TAKE CTL OF THE ACFT AND CLB BACK TO INITIAL APCH ALT. NEAR THE SAME TIME, APCH CTLR QUERIED THEIR ALT.

Narrative: THE PLT UNDER INSTRUCTION, BEING CLRED FOR THE APCH, BEGAN A DSCNT WHEN HE THOUGHT HE WAS ON A PUBLISHED SEGMENT OF THE NBG TAC 22. HOWEVER, HIS CDI WAS BUGGED IMPROPERLY FROM THE PREVIOUS APCH AT A NEARBY ARPT (LAKEFRONT). WHEN I, AS THE INSTRUCTOR, TOOK CTLS WE HAD ALREADY DSNDED TO 1650 FT MSL (APPROX 350 FT LOW). ATC QUERIED OUR ALT. THE BIGGEST PROB WAS TIME COMPRESSION DUE TO MULTIPLE APCHS TO MULTIPLE FIELDS WITHIN CLOSE PROX. WE SHOULD HAVE HAD MORE OF A STRAIGHT-IN TO GET SET UP -- BLAME ON US AND ATC.

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.