SA1612WE
Installation of Hamilton Standard Hydromatic Full Feathering Propellers 22D30-213/6533A-12, Propeller feather system, BT-13 oil cooler and cowling and modified oil tank. Held by Walter e. Heller and Company. Last revised February 21, 1968. System: propeller.
What it applies to
- Kind of product
- Aircraft
- Design holder
- Lockheed Aircraft Corporation
- Models
- Electra 10-A (Army UC-36A; Navy R-20; and XR-20-1)
- Type certificate
- TC 551
- 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.