BE20, super king air pilot had altitude deviation and track deviation while attempting an autocoupled approach to runway 15 at chs.

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Attributes
ACN	565676
Time
Date	200211
Day	Sun
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : chs.airport
State Reference	SC
Altitude	msl bound lower : 1200 msl bound upper : 1600
Environment
Flight Conditions	Mixed
Aircraft 1
Controlling Facilities	tower : chs.tower
Operator	general aviation : personal
Make Model Name	Super King Air 200 HDC
Operating Under FAR Part	Part 91
Navigation In Use	ils localizer & glide slope : 15
Flight Phase	descent : approach
Route In Use	approach : instrument non precision
Flight Plan	IFR
Person 1
Affiliation	other
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : cfi
Experience	flight time last 90 days : 134 flight time total : 12000 flight time type : 130
ASRS Report	565676
Person 2
Affiliation	government : faa
Function	controller : local
Events
Anomaly	aircraft equipment problem : critical altitude deviation : excursion from assigned altitude inflight encounter : weather non adherence : far non adherence : published procedure non adherence : clearance other anomaly other other spatial deviation
Independent Detector	atc equipment : msaw other controllera
Resolutory Action	controller : issued alert flight crew : overrode automation flight crew : returned to assigned altitude flight crew : returned to intended or assigned course none taken : detected after the fact
Consequence	other
Supplementary
Problem Areas	Aircraft Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

While being vectored for the ILS approach for runway 15 at chs, the autoplt failed to couple on the approach, no capture of the GS or localizer. I had to take over manual control and finish the approach. The tower informed me at the OM that I had set off the low altitude alert. I was about 10 degrees off course and about 400 ft low when I took control. The aircraft ahead of me reported runway in sight at the OM. I also picked up visual contact at the OM and was on my assigned altitude of 1600 ft MSL. The avionics shop could not find a problem when I had it checked after landing. Their only explanation was 'it was one of those glitches in the autoplt.' if this had been hard IFR, it would have had serious consequences. In single pilot IFR conditions in this aircraft or any other, I will anticipate flight management problems and be prepared to deal with them sooner in the future.

Original NASA ASRS Text

Title: BE20, SUPER KING AIR PLT HAD ALTDEV AND TRACK DEV WHILE ATTEMPTING AN AUTOCOUPLED APCH TO RWY 15 AT CHS.

Narrative: WHILE BEING VECTORED FOR THE ILS APCH FOR RWY 15 AT CHS, THE AUTOPLT FAILED TO COUPLE ON THE APCH, NO CAPTURE OF THE GS OR LOC. I HAD TO TAKE OVER MANUAL CTL AND FINISH THE APCH. THE TWR INFORMED ME AT THE OM THAT I HAD SET OFF THE LOW ALT ALERT. I WAS ABOUT 10 DEGS OFF COURSE AND ABOUT 400 FT LOW WHEN I TOOK CTL. THE ACFT AHEAD OF ME RPTED RWY IN SIGHT AT THE OM. I ALSO PICKED UP VISUAL CONTACT AT THE OM AND WAS ON MY ASSIGNED ALT OF 1600 FT MSL. THE AVIONICS SHOP COULD NOT FIND A PROB WHEN I HAD IT CHKED AFTER LNDG. THEIR ONLY EXPLANATION WAS 'IT WAS ONE OF THOSE GLITCHES IN THE AUTOPLT.' IF THIS HAD BEEN HARD IFR, IT WOULD HAVE HAD SERIOUS CONSEQUENCES. IN SINGLE PLT IFR CONDITIONS IN THIS ACFT OR ANY OTHER, I WILL ANTICIPATE FLT MGMNT PROBS AND BE PREPARED TO DEAL WITH THEM SOONER IN THE FUTURE.

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.