Supplemental type certificate · Onboard Systems
- Holder
- Onboard Systems · United States
- Status
- Current · Reissued
- Status date
- April 28, 1987
- Applied
- April 10, 1972
- Product
- Aircraft · Rotorcraft
- Certification basis
- Part 21
From FAA DRS, with our copy of the certificate PDF. DRS record last changed December 5, 2025.
What it approves
Installation of Chadwick electronic weighing system C-46.
What the certificate says
From the PDF’s text layer, without the form’s printed wording. Layout and order may differ; the PDF is the record.
This certificate is a scan without a text layerOpen the PDF to read it. ADs that name this STC · 0
An AD can apply because an STC is installed, or mention one in its text.
No AD in this release names this STC Approved models · 2
| Make | Model | Data sheet |
|---|
| Sikorsky Aircraft Corporation | S-55 | 1H4 |
| Sikorsky Aircraft Corporation | S-55C | 1H4 |