# STC SA1604SO

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: Phoenix Air Group Inc., United States
- Description: Installation of wing external stores attach points on the lower surface of both wings
- Applied: December 6, 1983
- Status date: May 29, 2024
- Product: Aircraft, Large Airplane
- Certification basis: Part 25
- Data sheets: [TCDS A10CE](https://openairdocs.org/tcds/A10CE)
- Certificate PDF: https://openairdocs.org/files/sha256/60/de/60de44b92aecc8152a523dd51fceba7287d55a9d2088fe8464aa254bcb95bbbf
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID137860034820240725213111.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA1604SO

## ADs that name it (0)

None.

## Approved models (6)

- Learjet Inc. Learjet 25 ([TCDS A10CE](https://openairdocs.org/tcds/A10CE))
- Learjet Inc. Learjet 25C ([TCDS A10CE](https://openairdocs.org/tcds/A10CE))
- Learjet Inc. Learjet 35 ([TCDS A10CE](https://openairdocs.org/tcds/A10CE))
- Learjet Inc. Learjet 35A (C-21A) ([TCDS A10CE](https://openairdocs.org/tcds/A10CE))
- Learjet Inc. Learjet 36 ([TCDS A10CE](https://openairdocs.org/tcds/A10CE))
- Learjet Inc. Learjet 36A ([TCDS A10CE](https://openairdocs.org/tcds/A10CE))

## What the certificate says

Read from the PDF's text layer, without the form's printed wording; the layout is lost and the order can differ. The PDF is the record.

SA1604SO Phoenix Air Group, Inc.

100 Phoenix Air Drive, S.W.

Cartersville, GA 30120 Part 25 Title 14 Code of Federal Regulations A10CE Learjet Corp 25, 25C, 35, 35A, 36, and 36A Installation of wing external stores attach points on the lower surface of both wings in accordance with Vertex Aerospace Flight International Aviation LLC Master Drawing List No. 35100 Rev. B, dated December 13, 2020.

1. Maintenance must be performed in accordance with Air Affairs Australia Pty. Ltd. Document No. TM 050-153-407 Rev. B, dated November 27, 2018.

(See Limitations and Conditions Continued on Page 3 of 3) December 6, 1983 September 14, 1987, September 21, 2022, May 29, 2024 May 23, 1984 June 18, 1984, February 27, 1985, November 26, 1999, September 18, 2017 January 13, 2021 Christina M. Underwood Manager, East Certification Branch Compliance & Airworthiness Division Aircraft Certification Service 3

SA1604SO 3

SA1604SO Date Reissued: May 29, 2024

2. The installer must determine whether this design change is compatible with previously approved modifications. This determination should include considerations of significant changes in weight distribution such as an increase in the fixed disposable weight in the fuselage.

3. If the holder agrees to permit another person to use the certificate to alter the product, the holder shall give the other person written evidence of that permission.

Certification Basis:

Based on 14 CFR §§ 21.115 and 21.101, and the FAA policy for significant changes in FAA Order 8110.48, the FAA certification basis for the Learjet Inc. Model 25, 25C, 35, 35A, 36, and 36A modification is shown on TCDS No. A10CE, Rev. No 67.

----------------------------END------------------------ 3 3

## Every issue (3)

- May 29, 2024: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/60/de/60de44b92aecc8152a523dd51fceba7287d55a9d2088fe8464aa254bcb95bbbf)
- September 21, 2022: Reissued, Historical. [certificate](https://openairdocs.org/files/sha256/b2/a0/b2a06aeef3a233143894688a6bcb03967faba17752f63f89d6bdd02c3dca4677)
- January 13, 2021: Amended, Historical. [certificate](https://openairdocs.org/files/sha256/0a/b6/0ab65789a406874c9200c3395ff05218d333f74d572f6149e2ee8d8dee0af2ae)

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