# STC ST09053SC

- Type: Supplemental type certificate
- Status: Current, Issued
- Holder: Phil Sears & Associates, United States
- Description: Installation of a Phil Sears APU duct part number S212T3121 as a replacement for Boeing part number 212T3121 APU duct.
- Status date: June 9, 1995
- Product: Aircraft, Large Multi-Engine
- Certification basis: Part 21
- Data sheets: [TCDS A1NM](https://openairdocs.org/tcds/A1NM)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/19C9D8A665493A4985256CC300035D70.0001
- DRS record last changed: December 5, 2025
- Page: https://openairdocs.org/stc/ST09053SC

## ADs that name it (0)

None.

## Approved models (2)

- The Boeing Company 767-200 Series ([TCDS A1NM](https://openairdocs.org/tcds/A1NM))
- The Boeing Company 767-300 Series ([TCDS A1NM](https://openairdocs.org/tcds/A1NM))

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