C560 crew had instrument problems. Captain had altitude deviation.

Attributes
ACN	424362
Time
Date	199901
Day	Fri
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : lit
State Reference	AR
Altitude	msl bound lower : 2000 msl bound upper : 2300
Environment
Flight Conditions	IMC
Light	Night
Aircraft 1
Operator	general aviation : corporate
Make Model Name	Citation V
Navigation In Use	Other
Route In Use	enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	Other
Function	flight crew : captain oversight : pic
Experience	flight time last 90 days : 120 flight time total : 7800 flight time type : 350
ASRS Report	424362
Person 2
Affiliation	Other
Function	flight crew : first officer
Qualification	pilot : commercial
Events
Anomaly	aircraft equipment problem : critical altitude deviation : excursion from assigned altitude other anomaly other other spatial deviation
Independent Detector	other controllera other flight crewa
Consequence	Other
Supplementary
Air Traffic Incident	Pilot Deviation

Narrative:

While descending into lit we encountered IMC, rime ice, rain, and moderate chop. As I turned to a heading with the autoplt direct lit the attitude indicator remained in a bank. Xchking, I noticed the RMI's were 55 degrees off headings. I switched to #2 and corrected the course. The autoplt and flight director were kicked off. I continued to have problems with the altitude select and autoplt as I attempted to re-engage it. It was during radar vectors to the approach and descent to 2300 ft that we noticed our altitude at 2000 ft MSL. We stopped the descent and climbed to 2300 ft MSL. ATC noted our altitude deviation at the time we noticed. We were thankful for their backup during a time of flight director problems in our cockpit. This occurred at the end of a 13 hour crew day, bad WX, instrument problems, and lack of crew rest. The first officer (PNF) in the right seat, had only 4 hours of rest due to inability to go to sleep the night before. We were tired from a trip lit-orl-lit. We had not eaten in about 7 hours.

Original NASA ASRS Text

Title: C560 CREW HAD INST PROBS. CAPT HAD ALTDEV.

Narrative: WHILE DSNDING INTO LIT WE ENCOUNTERED IMC, RIME ICE, RAIN, AND MODERATE CHOP. AS I TURNED TO A HDG WITH THE AUTOPLT DIRECT LIT THE ATTITUDE INDICATOR REMAINED IN A BANK. XCHKING, I NOTICED THE RMI'S WERE 55 DEGS OFF HDGS. I SWITCHED TO #2 AND CORRECTED THE COURSE. THE AUTOPLT AND FLT DIRECTOR WERE KICKED OFF. I CONTINUED TO HAVE PROBS WITH THE ALT SELECT AND AUTOPLT AS I ATTEMPTED TO RE-ENGAGE IT. IT WAS DURING RADAR VECTORS TO THE APCH AND DSCNT TO 2300 FT THAT WE NOTICED OUR ALT AT 2000 FT MSL. WE STOPPED THE DSCNT AND CLBED TO 2300 FT MSL. ATC NOTED OUR ALTDEV AT THE TIME WE NOTICED. WE WERE THANKFUL FOR THEIR BACKUP DURING A TIME OF FLT DIRECTOR PROBS IN OUR COCKPIT. THIS OCCURRED AT THE END OF A 13 HR CREW DAY, BAD WX, INST PROBS, AND LACK OF CREW REST. THE FO (PNF) IN THE R SEAT, HAD ONLY 4 HRS OF REST DUE TO INABILITY TO GO TO SLEEP THE NIGHT BEFORE. WE WERE TIRED FROM A TRIP LIT-ORL-LIT. WE HAD NOT EATEN IN ABOUT 7 HRS.

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.