NAWCAD NTWL HX-21 at Patuxent River, MD seeks follow-on Contractor Maintenance Support services for organizational-level maintenance, with limited intermediate/depot-level support, on CH-53K test aircraft, with on-site staffing estimated to increase from 62 to 75 FTEs. Work includes aircraft maintenance and logistics support, prototype component maintenance, internal/external ballast configuration, and Helicopter Support Team/external sling load duties, primarily at Patuxent River with temporary detachment sites including naval vessels, Department of War installations, and commercial facilities. Anticipated timelines include draft RFP release around May 1, 2027, final RFP release around Aug 1, 2027, award around May 1, 2028, and performance from Aug 19, 2028 through Aug 18, 2033. The anticipated contract is a C-type with firm-fixed-price labor CLINs, cost-reimbursable ODCs, and a possible cost-reimbursable performance-incentive CLIN, consisting of a 12-month base period plus four one-year options. The applicable NAICS is 488190 with a $40.0M small-business size standard, and businesses of all sizes are encouraged to respond to help determine whether a small-business set-aside is appropriate.