SH2138SO
Modification of the exhaust and the addition of a muffler and re-contoured engine cowling in accordance with Farrington Aircraft Corp. installation instructions dated February 27, 1987 and Master Drawing List revised August 23, 1987. Held by Heliplane Aircraft Corporation International, which holds 7 approved modifications in all. Last revised June 27, 2011. System: engine.
What it applies to
- Kind of product
- Aircraft
- Design holder
- Air & Space America Inc.
- Models
- 18A
- Type certificate
- 1H17
- On this site
- Air & Space America Inc 18 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 7, 2026.