# STC SA399NW

- Type: Supplemental type certificate
- Status: Current, Issued
- Holder: Sorm Inc, United States
- Description: Modify type design by installation of Sorm Bulk Liquid Cargo Tank Assembly SI-9101
- Applied: November 5, 1976
- Status date: January 20, 1977
- Product: Aircraft, Large Airplane
- Certification basis: Part 21
- Data sheets: [TCDS 4A22](https://openairdocs.org/tcds/4A22)
- Certificate PDF: https://openairdocs.org/files/sha256/35/dd/35dd9f787eefceef6416477c06564c94b4d548f6898c74c3ecf8815ca9f03985
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/7B1692A6B5B4C80686257AD30065749B.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA399NW

## ADs that name it (0)

None.

## Approved models (2)

- Lockheed Martin Corporation 188A ([TCDS 4A22](https://openairdocs.org/tcds/4A22))
- Lockheed Martin Corporation 188C ([TCDS 4A22](https://openairdocs.org/tcds/4A22))

## What the certificate says

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

## Every issue (1)

- January 20, 1977: Issued, Current. [certificate](https://openairdocs.org/files/sha256/35/dd/35dd9f787eefceef6416477c06564c94b4d548f6898c74c3ecf8815ca9f03985)

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