# STC ST505SO

- Type: Supplemental type certificate
- Status: Current, Issued
- Holder: National Airlines, Inc, United States
- Description: Manufacture of Nordskog storage units in accordance with Nordskog drawings 1-209, Rev. B and 1-210, Rev. B and their installation in accordance with NAL E.O. P-2350-01 and P-2350-00-06, Rev. B respectively. (747-100 SERIES -135)
- Status date: May 23, 1972
- Product: Aircraft, Large Multi-Engine
- Certification basis: Part 21
- Data sheets: [TCDS A20WE](https://openairdocs.org/tcds/A20WE)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/D49CDE4B029DB49985256CC300036058.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/ST505SO

## ADs that name it (0)

None.

## Approved models (1)

- The Boeing Company 747-100 Series ([TCDS A20WE](https://openairdocs.org/tcds/A20WE))

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