SA451CE
Install Hoskins Twilighter MK III Supplementary lighting system with Model E, F or P wing tip and Model C tail lights. Held by Bf Goodrich Aerospace, which holds 139 approved modifications in all. Last revised September 30, 2011. System: electrical power.
What it applies to
- Kind of product
- Aircraft
- Design holder
- The Dee Howard Company; Lockheed Aircraft Corporation; Lockheed Aircraft Corporation
- Models
- 500, Lockheed 18, Navy PV-1
- Type certificates
- A1SW, A-723, LTC-13
- 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 8, 2026.