Narrative:

Inbound to stl on the moduc arrival. Instructed to depart burck on 360 degree heading. After burck received clearance to 7000' and new heading of 010 degree. Began IFR approach check. Received new heading of 350 degree, completed the turn and resumed IFR approach check. Received new heading of 330 degree to intercept 30L-lda and descent to 5500. Initiated turn and descent and once again attempted to finish IFR approach check but localizer came alive almost immediately simultaneously with wake turbulence. Increased rate of turn and added power (less than usual because we were also assigned 170 KTS till cards). The captain was completing the IFR check when the altitude alerter went off (at 5300'). Recovered without going below 5200'. Simultaneously with the altitude alert ATC called with an altitude reminder and a new heading of 270 degree to rejoin the lda. Contributing factors: high workload. The need to complete the IFR checklist prior to the IAF and constantly receiving heading, altitude and speed changes. High traffic density at stl causing the radio to be going continuously. Late turn on to the final necessitating abnormal maneuvering to capture the course. Late descent causing course capture and level off to occur simultaneously. Wake turbulence encounter. How it was discovered: I think the altitude beep at 5800' may have been obscured by the 'landing gear' voice warning when the radar altimeter was tested. Failure to realize how close we were to the course and altitude. Factors affecting human performance: possible fatigue. This was the morning of the 5TH day of a 5-DAY trip with long duty days.

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Original NASA ASRS Text

Title: COMMUTER LTT ALT DEVIATION OVERSHOT IN DESCENT AND TRACK DEVIATION INTERCEPTING LOC.

Narrative: INBND TO STL ON THE MODUC ARRIVAL. INSTRUCTED TO DEPART BURCK ON 360 DEG HDG. AFTER BURCK RECEIVED CLRNC TO 7000' AND NEW HDG OF 010 DEG. BEGAN IFR APCH CHECK. RECEIVED NEW HDG OF 350 DEG, COMPLETED THE TURN AND RESUMED IFR APCH CHECK. RECEIVED NEW HDG OF 330 DEG TO INTERCEPT 30L-LDA AND DESCENT TO 5500. INITIATED TURN AND DSCNT AND ONCE AGAIN ATTEMPTED TO FINISH IFR APCH CHECK BUT LOC CAME ALIVE ALMOST IMMEDIATELY SIMULTANEOUSLY WITH WAKE TURBULENCE. INCREASED RATE OF TURN AND ADDED POWER (LESS THAN USUAL BECAUSE WE WERE ALSO ASSIGNED 170 KTS TILL CARDS). THE CAPT WAS COMPLETING THE IFR CHECK WHEN THE ALT ALERTER WENT OFF (AT 5300'). RECOVERED WITHOUT GOING BELOW 5200'. SIMULTANEOUSLY WITH THE ALT ALERT ATC CALLED WITH AN ALT REMINDER AND A NEW HDG OF 270 DEG TO REJOIN THE LDA. CONTRIBUTING FACTORS: HIGH WORKLOAD. THE NEED TO COMPLETE THE IFR CHECKLIST PRIOR TO THE IAF AND CONSTANTLY RECEIVING HDG, ALT AND SPEED CHANGES. HIGH TFC DENSITY AT STL CAUSING THE RADIO TO BE GOING CONTINUOUSLY. LATE TURN ON TO THE FINAL NECESSITATING ABNORMAL MANEUVERING TO CAPTURE THE COURSE. LATE DSCNT CAUSING COURSE CAPTURE AND LEVEL OFF TO OCCUR SIMULTANEOUSLY. WAKE TURBULENCE ENCOUNTER. HOW IT WAS DISCOVERED: I THINK THE ALT BEEP AT 5800' MAY HAVE BEEN OBSCURED BY THE 'LNDG GEAR' VOICE WARNING WHEN THE RADAR ALTIMETER WAS TESTED. FAILURE TO REALIZE HOW CLOSE WE WERE TO THE COURSE AND ALT. FACTORS AFFECTING HUMAN PERFORMANCE: POSSIBLE FATIGUE. THIS WAS THE MORNING OF THE 5TH DAY OF A 5-DAY TRIP WITH LONG DUTY DAYS.

Data retrieved from NASA's ASRS site as of August 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.