SA4445SW
Replace overspeed warning bell with overspeed clacker and add fire warning bell. Held by Bkm Systems, which holds 12 approved modifications in all. Last revised August 14, 1981. System: emergency equipment.
What it applies to
- Kind of product
- Aircraft
- Design holder
- Lockheed Martin Corporation; Lockheed Martin Corporation; Lockheed Martin Corporation; Lockheed Martin Corporation
- Models
- 1329-23A, 1329-23D, 1329-23E, 1329-25
- Type certificates
- 2A15, 2A15, 2A15, 2A15
- On this site
- Lockheed 1329 6 registered
- 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 22, 2026.