# STC ST424SO

- Type: Supplemental type certificate
- Status: Current, Issued
- Holder: Piedmont Aviation Inc, United States
- Description: Installation of replacement radome assembly.
- Status date: January 1, 1960
- Product: Aircraft, Large Multi-Engine
- Certification basis: Part 21
- Data sheets: [TCDS A1PC](https://openairdocs.org/tcds/A1PC)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/A0B7F87BAC0D4806862570C200618309.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/ST424SO

## ADs that name it (0)

None.

## Approved models (1)

- Mitsubishi Heavy Industries Ltd. YS-11 Series ([TCDS A1PC](https://openairdocs.org/tcds/A1PC))

---
From OpenAirDocs.org, an independent open copy of FAA and NTSB data. Only the Federal Register edition on govinfo.gov is the official legal text of an AD.