SH1599SO
Removal of main transmission oil cooler blower and associated parts. Held by Orlando Heli Airways INC, which holds 5 approved modifications in all. Last revised April 26, 1984. System: rotorcraft systems.
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; Sikorsky Aircraft Corporation; Sikorsky Aircraft Corporation; Sikorsky Aircraft Corporation; Sikorsky Aircraft Corporation
- Models
- S-55B, S-55, HRS-1/CH-19, H-19G, H-19D, CH-19E, UH-19C, YH-19A, H-19A, HRS-3/H-19B
- Type certificates
- 1H4, 1H4, HR1SO, HR1SO, HR1SO, HR1SO, HR1SO, HR1SO, HR1SO, HR1SO
- On this site
- Sikorsky S-55 15 registered
Sikorsky UH-19 7 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.