A ce-650 EFIS type citation descends below the GS during a visual approach to runway 28R at cmh, oh.

Attributes
ACN	597508
Time
Date	200310
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : cmh.airport
State Reference	OH
Altitude	agl bound lower : 1500 agl bound upper : 3000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zob.artcc tower : cmh.tower
Operator	common carrier : air carrier
Make Model Name	Citation III, VI, VII
Operating Under FAR Part	Part 91
Navigation In Use	other
Flight Phase	descent : approach
Route In Use	approach : visual
Flight Plan	IFR
Person 1
Affiliation	company : corporate
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 100 flight time total : 5200 flight time type : 500
ASRS Report	597508
Person 2
Affiliation	company : corporate
Function	flight crew : first officer
Events
Anomaly	altitude deviation : overshoot altitude deviation : excursion from assigned altitude non adherence : published procedure non adherence : company policies non adherence : clearance other spatial deviation
Independent Detector	aircraft equipment other aircraft equipment : glide slope aural other flight crewa
Resolutory Action	flight crew : returned to assigned altitude flight crew : overrode automation flight crew : became reoriented
Supplementary
Problem Areas	Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Approaching cmh airport and in VFR WX and with the airport in sight, we were cleared to descend from 4000 ft to 3000 ft and were also cleared by ATC for the visual approach to runway 28R and to contact the tower. The autoplt was on and we proceeded to capture the localizer. However, when we were cleared for the visual approach, the first officer proceeded to select '0000' ft in the altitude window instead of leaving '3000' ft in order to descend and to capture the GS. (The first officer would tell me later on that he had picked up this habit in his previous job where it was customary to select '0000' altitude in the altitude window when the crew was cleared for a visual approach.) the airplane proceeded to descend until it appeared to me, and to the first officer, to be unusually low. At the same time we heard an aural 'GS' annunciator informing us that we were below the GS. I then proceeded immediately to disconnect the autoplt and to immediately climb to get back on GS. Back on the GS, we went on to land. After the flight, we discussed the situation and we decided that this whole situation could have been avoided if we had used our normal SOP's forcing both pilots to verify and confirm that the correct altitude was set in the altitude window.

Original NASA ASRS Text

Title: A CE-650 EFIS TYPE CITATION DSNDS BELOW THE GS DURING A VISUAL APCH TO RWY 28R AT CMH, OH.

Narrative: APCHING CMH ARPT AND IN VFR WX AND WITH THE ARPT IN SIGHT, WE WERE CLRED TO DSND FROM 4000 FT TO 3000 FT AND WERE ALSO CLRED BY ATC FOR THE VISUAL APCH TO RWY 28R AND TO CONTACT THE TWR. THE AUTOPLT WAS ON AND WE PROCEEDED TO CAPTURE THE LOC. HOWEVER, WHEN WE WERE CLRED FOR THE VISUAL APCH, THE FO PROCEEDED TO SELECT '0000' FT IN THE ALT WINDOW INSTEAD OF LEAVING '3000' FT IN ORDER TO DSND AND TO CAPTURE THE GS. (THE FO WOULD TELL ME LATER ON THAT HE HAD PICKED UP THIS HABIT IN HIS PREVIOUS JOB WHERE IT WAS CUSTOMARY TO SELECT '0000' ALT IN THE ALT WINDOW WHEN THE CREW WAS CLRED FOR A VISUAL APCH.) THE AIRPLANE PROCEEDED TO DSND UNTIL IT APPEARED TO ME, AND TO THE FO, TO BE UNUSUALLY LOW. AT THE SAME TIME WE HEARD AN AURAL 'GS' ANNUNCIATOR INFORMING US THAT WE WERE BELOW THE GS. I THEN PROCEEDED IMMEDIATELY TO DISCONNECT THE AUTOPLT AND TO IMMEDIATELY CLB TO GET BACK ON GS. BACK ON THE GS, WE WENT ON TO LAND. AFTER THE FLT, WE DISCUSSED THE SIT AND WE DECIDED THAT THIS WHOLE SIT COULD HAVE BEEN AVOIDED IF WE HAD USED OUR NORMAL SOP'S FORCING BOTH PLTS TO VERIFY AND CONFIRM THAT THE CORRECT ALT WAS SET IN THE ALT WINDOW.

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.