Petition number 4601-02-200606; Internal Advice; 19 CFR 177.11; Foster Wheeler Energy Corporation; Red Oak HRSG Piping Materials; Red Oak HRSG Project; 19 USC 1520(c)(1); Mistake of Fact; ITT Corp. v. United States, 24 F.3d 1384, 1387 (Fed Cir. 1994); Hambro Automotive Corporation v. United States, 66 CCPA 113, 118, C.A.D. 1231, 603 F.2d 850 (1979); Concentric Pumps, Ltd., v. United States, 10 CIT 505, 508, 643 F Supp. 623 (1986); C.J. Tower & Sons of Buffalo, Inc. v. United States, 68 Cust. Ct. 17, 22; C.D. 4327, 336 F. Supp. 1395, 1399 (1972), aff’d 61 CCPA 90, C.A.D. 1129, 499 F.2d 1277 (1974); PPG Industries, Inc. v. United States, 4 CIT 143, 147-148 (1982); Taban Co. V. United States, 960 F. Supp. 326, 334-35 (Ct. Int’l Trade 1997); Zaki Corp. v. United States, 960 F. Supp. 350, 359-360 (Ct. Int’l Trade 1997); Bar Bea Truck Leasing Co., Inc. v. United States, 5 CIT 124, 126 (1983).Dear Sir/Madam: