# STC ST735SO

- Type: Supplemental type certificate
- Status: Current, Surrendered
- Holder: Derlan Inc, United States
- Description: Installation of protective rigid cover over the tail cone emergency evacuation slide.
- Applied: March 11, 1991
- Status date: January 21, 2003
- Product: Aircraft, Large Multi-Engine
- Certification basis: Part 21
- Data sheets: [TCDS A6WE](https://openairdocs.org/tcds/A6WE)
- Certificate PDF: https://openairdocs.org/files/sha256/5a/58/5a58c071f59f890956c15e1cec7570ffc40af1640a07a5ba969e178e10a2a29a
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/77D1552D4810FE9F86256D430064948B.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/ST735SO

## ADs that name it (1)

- [AD 2008-18-06](https://openairdocs.org/ad/2008-18-06): Tail cone slide · Protective rigid cover over the tail cone emergency evacuation… (Derlan STC ST735SO). Effective Jan 7, 2009. Named in the applicability

## Approved models (15)

- McDonnell Douglas Corporation DC-9-11 ([TCDS A6WE](https://openairdocs.org/tcds/A6WE))
- McDonnell Douglas Corporation DC-9-12 ([TCDS A6WE](https://openairdocs.org/tcds/A6WE))
- McDonnell Douglas Corporation DC-9-13 ([TCDS A6WE](https://openairdocs.org/tcds/A6WE))
- McDonnell Douglas Corporation DC-9-14 ([TCDS A6WE](https://openairdocs.org/tcds/A6WE))
- McDonnell Douglas Corporation DC-9-15 ([TCDS A6WE](https://openairdocs.org/tcds/A6WE))
- McDonnell Douglas Corporation DC-9-15F ([TCDS A6WE](https://openairdocs.org/tcds/A6WE))
- McDonnell Douglas Corporation DC-9-21 ([TCDS A6WE](https://openairdocs.org/tcds/A6WE))
- McDonnell Douglas Corporation DC-9-31 ([TCDS A6WE](https://openairdocs.org/tcds/A6WE))
- McDonnell Douglas Corporation DC-9-32 ([TCDS A6WE](https://openairdocs.org/tcds/A6WE))
- McDonnell Douglas Corporation DC-9-32F ([TCDS A6WE](https://openairdocs.org/tcds/A6WE))
- McDonnell Douglas Corporation DC-9-33F ([TCDS A6WE](https://openairdocs.org/tcds/A6WE))
- McDonnell Douglas Corporation DC-9-34 ([TCDS A6WE](https://openairdocs.org/tcds/A6WE))
- McDonnell Douglas Corporation DC-9-34F ([TCDS A6WE](https://openairdocs.org/tcds/A6WE))
- McDonnell Douglas Corporation DC-9-41 ([TCDS A6WE](https://openairdocs.org/tcds/A6WE))
- McDonnell Douglas Corporation DC-9-51 ([TCDS A6WE](https://openairdocs.org/tcds/A6WE))

## What the certificate says

The certificate is a scan without a text layer; open the PDF to read it.

## Every issue (1)

- January 21, 2003: Surrendered, Current. [certificate](https://openairdocs.org/files/sha256/5a/58/5a58c071f59f890956c15e1cec7570ffc40af1640a07a5ba969e178e10a2a29a)

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