# STC ST729SO

- Type: Supplemental type certificate
- Status: Current, Issued
- Holder: Bellomy-Lawson Aviation Inc, United States
- Description: Removal of pressurization and cabin cooling systems.
- Status date: July 10, 1972
- Product: Aircraft, Large Multi-Engine
- Certification basis: Part 21
- Data sheets: [TCDS 6A4](https://openairdocs.org/tcds/6A4)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/7009AF59570AC97585256CC3000360E5.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/ST729SO

## ADs that name it (0)

None.

## Approved models (1)

- McDonnell Douglas Corporation DC-6B (Navy R6D-1Z) ([TCDS 6A4](https://openairdocs.org/tcds/6A4))

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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.