The U.S. aircraft register, updated daily
Approved modifications · supplemental type certificate · current · issued

SE5601SW

Replacement splined end and oil mist lubrication on accessory drive gearshaft. Held by Aviall of Texas, INC, which holds 6 approved modifications in all. Last revised December 12, 1983. 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 Canada Inc.; Pratt & Whitney Canada Inc.; Pratt & Whitney Canada Inc.; Pratt & Whitney Canada Inc.; Pratt & Whitney Canada Inc.; Pratt & Whitney Canada Inc.; Pratt & Whitney Canada Inc.; Pratt & Whitney Canada Inc.; Pratt & Whitney Division; Pratt & Whitney Division; Pratt & Whitney Division
Models
PT6A-34AG, PT6A-20, PT6A-27, PT6A-34, PT6A-25A, PT6A-36, PT6A-28, PT6A-20B, PT6A-135, PT6A-21, PT6A-25, PT6A-6, PT6A-28, PT6A-34, PT6A-27
Type certificates
E4EA, E4EA, E4EA, E4EA, E4EA, E4EA, E4EA, E4EA, E4EA, E4EA, E4EA, E4EA, E2NE, E2NE, 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.