SE00028EN

Installation of Pratt & Whitney Engine Services Inc. SmartCycle Plus Engine Monitoring System, P/N EMU-K-010-1 on specified T53 engine models. Held by Pratt & Whitney Engine Services INC., which holds 48 approved modifications in all. Last revised October 27, 2007. System: engine.

What it applies to

Kind of product: Engine
Design holder: Ozark Aeroworks LLC; Ozark Aeroworks LLC; Ozark Aeroworks LLC; Ozark Aeroworks LLC; Ozark Aeroworks LLC
Models: T5309A, T5309B, T5309C, T5311A, T5311B
Type certificates: E1EA, E1EA, E1EA, E1EA, E1EA
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.