SH1072SO
Installation of dust boot retainer rings (in rotor head dampers). Held by Orlando Heli Airways INC, which holds 5 approved modifications in all. Last revised May 18, 1979. System: other and general.
What it applies to
- Kind of product
- Aircraft
- Design holder
- Sikorsky Aircraft Corporation; Sikorsky Aircraft Corporation; Sikorsky Aircraft Corporation; Sikorsky Aircraft Corporation; Sikorsky Aircraft Corporation; Sikorsky Aircraft Corporation
- Models
- S-55, S-55C, S-55B, H-19A, H-19D, H-19G
- Type certificates
- 1H4, 1H4, 1H4, HR1SO, HR1SO, HR1SO
- On this site
- Sikorsky S-55 15 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 8, 2026.