Air carrier medium large transport makes an unexpected missed approach as flight crew picks up an unexpected LOM signal while on a CAT ii IAP ILS where there is no LOM for FAF on rdu ILS 23R.

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Attributes
ACN	166761
Time
Date	199012
Day	Sun
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : rdu
State Reference	NC
Altitude	msl bound lower : 1740 msl bound upper : 1740
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : rdu tower : rdu
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	descent : approach
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : instrument pilot : flight engineer pilot : commercial pilot : atp
Experience	flight time last 90 days : 200 flight time total : 16000 flight time type : 5000
ASRS Report	166761
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	non adherence : published procedure other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	other
Consequence	Other
Supplementary
Primary Problem	Navigational Facility
Air Traffic Incident	Pilot Deviation other
Situations
Navigational Aid	Unspecified

Narrative:

We encountered a confusing situation on a CAT ii approach to runway 23R in rdu. The WX was approximately 2 1/4 F, RVR 2000', and we were cleared for the approach at 2200' MSL outside of prstn. We crossed bodly (7.0 DME) on the G/south at the published altitude (2140' MSL) and then at 1740' MSL (5.0 DME) we received an OM blue light and tone. We were confused since we had mentally connected bodly with an OM and had expected to see an OM at 2140' MSL (bodly) and not 1740' MSL. We initiated a go around and during the ensuing discussion realized that there is no OM on 23R. Because of the close proximity of 23R and 23L we had received the OM for 23L. After landing we discussed this with rdu tower and they confirmed that previous flts had experienced the same problem. I suggest a notation of this problem be made on the approach plate 11-1 to 23R or that the OM for 23L be decommissioned.

Original NASA ASRS Text

Title: ACR MLG MAKES AN UNEXPECTED MISSED APCH AS FLT CREW PICKS UP AN UNEXPECTED LOM SIGNAL WHILE ON A CAT II IAP ILS WHERE THERE IS NO LOM FOR FAF ON RDU ILS 23R.

Narrative: WE ENCOUNTERED A CONFUSING SITUATION ON A CAT II APCH TO RWY 23R IN RDU. THE WX WAS APPROX 2 1/4 F, RVR 2000', AND WE WERE CLRED FOR THE APCH AT 2200' MSL OUTSIDE OF PRSTN. WE CROSSED BODLY (7.0 DME) ON THE G/S AT THE PUBLISHED ALT (2140' MSL) AND THEN AT 1740' MSL (5.0 DME) WE RECEIVED AN OM BLUE LIGHT AND TONE. WE WERE CONFUSED SINCE WE HAD MENTALLY CONNECTED BODLY WITH AN OM AND HAD EXPECTED TO SEE AN OM AT 2140' MSL (BODLY) AND NOT 1740' MSL. WE INITIATED A GAR AND DURING THE ENSUING DISCUSSION REALIZED THAT THERE IS NO OM ON 23R. BECAUSE OF THE CLOSE PROX OF 23R AND 23L WE HAD RECEIVED THE OM FOR 23L. AFTER LNDG WE DISCUSSED THIS WITH RDU TWR AND THEY CONFIRMED THAT PREVIOUS FLTS HAD EXPERIENCED THE SAME PROB. I SUGGEST A NOTATION OF THIS PROB BE MADE ON THE APCH PLATE 11-1 TO 23R OR THAT THE OM FOR 23L BE DECOMMISSIONED.

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.