A B737-400 on approach to clt, nc, has a 30 degree bank commanded by the autoflt system. Flight crew has difficulty disconnecting the autoplt but when it is disconnected, they encounter a TCASII RA.

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Attributes
ACN	407712
Time
Date	199806
Day	Mon
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : clt
State Reference	NC
Altitude	msl bound lower : 4000 msl bound upper : 4000
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	tracon : clt
Operator	common carrier : air carrier
Make Model Name	B737-400
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	descent : approach
Route In Use	arrival other
Flight Plan	IFR
Aircraft 2
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : cfi pilot : atp
Experience	flight time last 90 days : 200 flight time total : 13000 flight time type : 3500
ASRS Report	407712
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	aircraft equipment problem : less severe other anomaly other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : returned to intended course or assigned course flight crew : became reoriented flight crew : regained aircraft control
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

Approaching clt terminal area off of the majic arrival we were given a vector of 210 degrees to intercept the localizer back course runway 23 approach. We were 16.5 mi from the clt VORTAC and leveling at 4000 ft MSL. The runway and airport environment were in sight at this time and course was slowly intercepting when the aircraft banked suddenly to the left in a 30 degree bank opposite of intended path. Mode control panel was set up on level change for descent and heading for roll at the time. Aircraft autoplt failed to disconnect on the yoke until 6-10 attempts were made. ATC ordered an immediate climb to 5000 ft MSL, which was then followed by a TCASII alert. I climbed immediately at that time to avoid the conflict. I applied firewall power and a 30 degree pitch attitude. Subsequently, a routine approach and landing was made. An appropriate logbook entry was made upon arrival at the gate.

Original NASA ASRS Text

Title: A B737-400 ON APCH TO CLT, NC, HAS A 30 DEG BANK COMMANDED BY THE AUTOFLT SYS. FLC HAS DIFFICULTY DISCONNECTING THE AUTOPLT BUT WHEN IT IS DISCONNECTED, THEY ENCOUNTER A TCASII RA.

Narrative: APCHING CLT TERMINAL AREA OFF OF THE MAJIC ARR WE WERE GIVEN A VECTOR OF 210 DEGS TO INTERCEPT THE LOC BACK COURSE RWY 23 APCH. WE WERE 16.5 MI FROM THE CLT VORTAC AND LEVELING AT 4000 FT MSL. THE RWY AND ARPT ENVIRONMENT WERE IN SIGHT AT THIS TIME AND COURSE WAS SLOWLY INTERCEPTING WHEN THE ACFT BANKED SUDDENLY TO THE L IN A 30 DEG BANK OPPOSITE OF INTENDED PATH. MODE CTL PANEL WAS SET UP ON LEVEL CHANGE FOR DSCNT AND HEADING FOR ROLL AT THE TIME. ACFT AUTOPLT FAILED TO DISCONNECT ON THE YOKE UNTIL 6-10 ATTEMPTS WERE MADE. ATC ORDERED AN IMMEDIATE CLB TO 5000 FT MSL, WHICH WAS THEN FOLLOWED BY A TCASII ALERT. I CLBED IMMEDIATELY AT THAT TIME TO AVOID THE CONFLICT. I APPLIED FIREWALL PWR AND A 30 DEG PITCH ATTITUDE. SUBSEQUENTLY, A ROUTINE APCH AND LNDG WAS MADE. AN APPROPRIATE LOGBOOK ENTRY WAS MADE UPON ARR AT THE GATE.

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.