SR02057NY
Upgrade of the S6135-20600 series main gearbox by replacing input free-wheeling units in accordance with Carson drawing. IFWU INSTL Carson S-61 No. CHI-R-001, no revision, dated 12-15-04 and Carson Installation Instructions Report CHI-R-INSTALL, no revision, dated 12-14-04. Held by Carson Helicopters, INC, which holds 15 approved modifications in all. Last revised February 10, 2005. System: other and general.
What it applies to
- Kind of product
- Aircraft
- Design holder
- Sikorsky Aircraft Corporation; Sikorsky Aircraft Corporation; Sikorsky Aircraft Corporation; Sikorsky Aircraft Corporation
- Models
- S-61L, S-61N, S-61NM, S-61A
- Type certificates
- 1H15, 1H15, 1H15, H2EA
- On this site
- Sikorsky S-61 54 registered
- The FAA's record
- On the FAA's site
What an approved modification is
A supplemental type certificate is the FAA's approval of a change to a certified design: a new engine or propeller, avionics, an autopilot, floats, a parachute, a larger fuel tank, an ice-protection kit. The company holding it may sell the kit and the paperwork to owners of the listed models; the modification then becomes part of that aircraft's record. The FAA's list says what was approved and for which models, not how many aircraft carry it.
Source: FAA supplemental type certificates (Dynamic Regulatory System). Register counts from the FAA register of October 22, 2026.