SA00192LA
Replacement of BTH AG4 impluse and nonimpulse magnetos with Slick Magnetos on Gipsy I, Gipsy II, and Gipsy III model engines and Gipsy major series 1 through 10MK2 model engines. Held by Moth Aircraft Company, which holds 3 approved modifications in all. Last revised September 21, 2015. System: engine.
What it applies to
- Kind of product
- Aircraft
- Design holder
- Lamon William E.; Robertson Cliff c/o Gadbois Business Management; Rust Robert E.; Rust Robert E.; Rust Robert E.; Williams Harry E.
- Models
- DHC-1B-2-S3, D.H.82A Tiger Moth, DHC-1 Chipmunk Mk 21, DHC-1 Chipmunk Mk 22, DHC-1 Chipmunk Mk 22A, DH 82A
- Type certificates
- A26NM, A8EU, A44EU, A44EU, A44EU, A5PC
- On this site
- Dehavilland DH82 13 registered
Dehavilland DHC-1 105 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 7, 2026.