SE5511NM
Installation of compressor discharge pressue (PC) valve. Held by Bell Helicopter Textron INC., which holds 366 approved modifications in all. Last revised May 29, 2013. System: engine.
What it applies to
- Kind of product
- Engine
- Design holder
- Rolls-Royce Corporation; Rolls-Royce Corporation; Rolls-Royce Corporation; Rolls-Royce Corporation; Rolls-Royce Corporation; Rolls-Royce Corporation; Rolls-Royce Corporation; Rolls-Royce Corporation; Rolls-Royce Corporation; Rolls-Royce Corporation; Rolls-Royce Corporation
- Models
- 250-C20, 250-C20B, 250-C20C (T63-A-720), 250-C20F, 250-C20J, 250-C20R, 250-C20R/1, 250-C20R/2, 250-C20R/4, 250-C20S, 250-C20W
- Type certificates
- E4CE, E4CE, E4CE, E4CE, E4CE, E4CE, E4CE, E4CE, E4CE, E4CE, E4CE
- 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 21, 2026.