THE HOLDING PATTERN SHOWN FOR OTT ON THE RAVNN ONE RNAV ARR TO BWI IN THE FMC DATABASE FOR ONE ACR'S B737 FLEET IS NOT THE SAME AS PUBLISHED FOR THE ARR.

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THE HOLDING PATTERN CONTAINED IN THE FMC FOR OTT ON THE RAVNN1 STAR INTO BWI IS INCORRECT. THE HOLDING PATTERN CONTAINED IS THE ONE DEPICTED ON THE US HI(4) ENRTE CHART WHICH SHOWS: QUAD/RAD SW 226 INBD CRS/DIR 046 L LEG TIME 1.5 MIN. THE HOLDING PATTERN AT OTT FOR THE RAVNN1 IS DIFFERENT AND THE FMC HOLDING PATTERN SHOULD ACTUALLY SHOW: QUAD/RAD SW 234 INBD CRS/DIR 054 R LEG LENGTH 13 MI. NO PLTDEVS OR EVENTS HAVE OCCURRED DUE TO THIS ERROR IN THE FMC SOFTWARE TO MY KNOWLEDGE. HOWEVER; THERE ARE 2 SEPARATE HOLDING PATTERNS PUBLISHED FOR OTT WHICH ARE COMPLETELY DIFFERENT. THE HOLDING PATTERN DEPICTED IN THE FMC SHOULD MATCH UP WITH THE ARR ACTUALLY BEING FLOWN. MY RECOMMENDATION IS FOR THE FMC SOFTWARE TO BE UPDATED TO REFLECT THE CORRECT HOLDING PATTERN USED AT OTT ON THE RAVNN1 STAR. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: A RECENT CHK IN BOTH THE CARRIERS B737-300 AND -700 SHOWED NO CHANGE IN THE HOLDING PATTERN. THERE HAS BEEN NO FMC DATABASE REVISION SINCE THE ORIGINAL RPT. THE RPTR DID NOT INDICATE WHICH MODEL FMC IS INSTALLED IN THE ACFT.