FK100 flight crew descended below assigned altitude.

Attributes
ACN	462610
Time
Date	200002
Day	Sun
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : msp.airport
State Reference	MN
Altitude	msl bound lower : 6700 msl bound upper : 7000
Aircraft 1
Controlling Facilities	tracon : m98.tracon
Operator	common carrier : air carrier
Make Model Name	Fokker 100
Operating Under FAR Part	Part 121
Navigation In Use	ils localizer & glide slope : 30r
Flight Phase	descent : approach
Route In Use	approach : instrument precision arrival : on vectors
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : multi engine pilot : instrument pilot : commercial
ASRS Report	462610
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : multi engine pilot : commercial pilot : atp pilot : instrument
ASRS Report	462611
Events
Anomaly	altitude deviation : overshoot non adherence : clearance
Independent Detector	other flight crewa other flight crewb
Resolutory Action	flight crew : returned to assigned altitude none taken : detected after the fact
Supplementary
Problem Areas	Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

While being radar vectored for ILS runway 30R approach at msp, ATC assigned us 7000 ft and direct jacko. After being turned over to the final controller, we were assigned direct bonna. This threw us for a moment because it was located behind the fix that we were already cleared to. (Through approximately 10000 ft, the captain disengaged the autoplt because he had been on vacation for a while and wanted to get some hand flying in.) as I was entering bonna, the captain was monitoring the entry to ensure proper fix identify. The fix was idented by both crew members and direct to and navigation were then selected. Just about that time the altitude alert went off showing us lower than our assigned altitude. (The 1000 ft above call was made.) since the captain was making a shallow descent, a quick recovery was made and no more than a 300 ft deviation below altitude was noted. ATC had no comments and the flight continued normally. Supplemental information from acn 462611: autoplt off. Distraction while looking at approach charts.

Original NASA ASRS Text

Title: FK100 FLC DSNDED BELOW ASSIGNED ALT.

Narrative: WHILE BEING RADAR VECTORED FOR ILS RWY 30R APCH AT MSP, ATC ASSIGNED US 7000 FT AND DIRECT JACKO. AFTER BEING TURNED OVER TO THE FINAL CTLR, WE WERE ASSIGNED DIRECT BONNA. THIS THREW US FOR A MOMENT BECAUSE IT WAS LOCATED BEHIND THE FIX THAT WE WERE ALREADY CLRED TO. (THROUGH APPROX 10000 FT, THE CAPT DISENGAGED THE AUTOPLT BECAUSE HE HAD BEEN ON VACATION FOR A WHILE AND WANTED TO GET SOME HAND FLYING IN.) AS I WAS ENTERING BONNA, THE CAPT WAS MONITORING THE ENTRY TO ENSURE PROPER FIX IDENT. THE FIX WAS IDENTED BY BOTH CREW MEMBERS AND DIRECT TO AND NAV WERE THEN SELECTED. JUST ABOUT THAT TIME THE ALT ALERT WENT OFF SHOWING US LOWER THAN OUR ASSIGNED ALT. (THE 1000 FT ABOVE CALL WAS MADE.) SINCE THE CAPT WAS MAKING A SHALLOW DSCNT, A QUICK RECOVERY WAS MADE AND NO MORE THAN A 300 FT DEV BELOW ALT WAS NOTED. ATC HAD NO COMMENTS AND THE FLT CONTINUED NORMALLY. SUPPLEMENTAL INFO FROM ACN 462611: AUTOPLT OFF. DISTR WHILE LOOKING AT APCH CHARTS.

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.