MD88 altitude deviation 55 mi northwest of crg.

Attributes
ACN	449724
Time
Date	199909
Day	Tue
Local Time Of Day	0601 To 1200
Place
Locale Reference	navaid : crg.vortac
State Reference	FL
Altitude	msl bound lower : 11200 msl bound upper : 12000
Environment
Flight Conditions	Mixed
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : jax.tracon
Operator	common carrier : air carrier
Make Model Name	MD-88
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	descent : approach descent : intermediate altitude
Route In Use	arrival star : 388
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 160 flight time total : 6100 flight time type : 1687
ASRS Report	449724
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument pilot : multi engine
ASRS Report	449710
Events
Anomaly	aircraft equipment problem : critical altitude deviation : undershoot non adherence : far non adherence : clearance
Independent Detector	aircraft equipment : altitude alert other flight crewa other flight crewb
Resolutory Action	flight crew : returned to assigned altitude
Supplementary
Problem Areas	Flight Crew Human Performance Aircraft
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

ZJX had given restr of 12000 ft at oneel fix. Handoff to approach (jax) occurred just as we approached fix. Aircraft was engaged (autoplt) with 12000 ft armed. At 12000 ft aircraft continued descent through 12000 ft. Autoplt disengaged and climbed back to 12000 ft. Approach 'check-in' with descent to 2000 ft commenced. Normal approach and landing at jax. Lessons learned: all the neat gadgets can sometimes bite you! This time, we're in a relatively sparse area, with no conflicting traffic. The civet 4 at lax would have been totally different. I guess that's why we must be always vigilant -- at all times!

Original NASA ASRS Text

Title: MD88 ALTDEV 55 MI NW OF CRG.

Narrative: ZJX HAD GIVEN RESTR OF 12000 FT AT ONEEL FIX. HDOF TO APCH (JAX) OCCURRED JUST AS WE APCHED FIX. ACFT WAS ENGAGED (AUTOPLT) WITH 12000 FT ARMED. AT 12000 FT ACFT CONTINUED DSCNT THROUGH 12000 FT. AUTOPLT DISENGAGED AND CLBED BACK TO 12000 FT. APCH 'CHK-IN' WITH DSCNT TO 2000 FT COMMENCED. NORMAL APCH AND LNDG AT JAX. LESSONS LEARNED: ALL THE NEAT GADGETS CAN SOMETIMES BITE YOU! THIS TIME, WE'RE IN A RELATIVELY SPARSE AREA, WITH NO CONFLICTING TFC. THE CIVET 4 AT LAX WOULD HAVE BEEN TOTALLY DIFFERENT. I GUESS THAT'S WHY WE MUST BE ALWAYS VIGILANT -- AT ALL TIMES!

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.