SP1051EA
Installation of Safeway de-icer overshoe P/N 5938 and Semsa lead P/N S2002. (R212/4-30-4/ 22) (R257/4-30-4/ 60). Held by Unc Accessory Service, which holds 6 approved modifications in all. Last revised April 26, 1995. System: propeller.
What it applies to
- Kind of product
- Propeller
- Design holder
- Dowty Rotol Ltd.; Dowty Rotol Ltd.
- Models
- R212/4-30-4/, R257/4-30-4/
- Type certificates
- P-899, P-899
- 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 7, 2026.