CREATE TABLE table_30892 ("Number" TEXT, "Serial Number" FLOAT, "Into Service" TEXT, "Withdrawn" TEXT, "Scrapped" TEXT)

Name the most serial number for feb 1994
SELECT MAX("Serial Number") FROM table_30892 WHERE "Scrapped" = 'Feb 1994'
SELECT MAX("Serial Number") FROM "table_30892" WHERE "Scrapped" = 'Feb 1994'