SE539NE
Modification of compressor turbine sealing segments to incorporate honeycomb material on the inside diameter thereby providing an abradable surface for turbine blade contact. Held by Airwork Corporation, which holds 10 approved modifications in all. Last revised October 9, 1987. System: engine.
What it applies to
- Kind of product
- Engine
- Design holder
- Pratt & Whitney Canada Inc.; Pratt & Whitney Canada Inc.; Pratt & Whitney Canada Inc.; Pratt & Whitney Canada Inc.; Pratt & Whitney Division
- Models
- PT6A-34B, PT6A-34, PT6A-34AG, PT6A-36, PT6A-34
- Type certificates
- E4EA, E4EA, E4EA, E4EA, E2NE
- 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 5, 2026.