# STC ST99CH

- Type: Supplemental type certificate
- Status: Current, Surrendered
- Holder: Snaky Creek Enterprises LLC dba Spectrum Aeromed, United States
- Description: Install air ambulance unit.
- Applied: October 29, 1991
- Status date: May 15, 2009
- Product: Aircraft, Small Multi-Engine
- Certification basis: Part 21, Part 25
- Data sheets: [TCDS A22CE](https://openairdocs.org/tcds/A22CE)
- Certificate PDF: https://openairdocs.org/files/sha256/00/be/00be928f00e2a0cef7ca0a8e8942083277f55d19eb6ce1fbe9345da42c1361dc
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/BC8649A2EB5758F9862575C200564063.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/ST99CH

## ADs that name it (0)

None.

## Approved models (3)

- Cessna Aircraft Company 500 ([TCDS A22CE](https://openairdocs.org/tcds/A22CE))
- Cessna Aircraft Company 550 ([TCDS A22CE](https://openairdocs.org/tcds/A22CE))
- Cessna Aircraft Company 560 ([TCDS A22CE](https://openairdocs.org/tcds/A22CE))

## 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.

Part 25 of the Federal Aviation Regulations. (See Type Certificate Data Sheet No. A22CE for complete certification basis)

Install air ambulance conversion in accordance with Spectrum Aeromed Inc. Master Drawing List 2009DL, Revision 2, dated November 14, 2006, or later FAA approved revisions.

1. FAA Approved Aircraft Flight Manual Supplement, 2009FMS, Revision 2, dated December 4, 2006, or later FAA approved revision is required. 2. FAA Accepted Instructions for Continued Airworthiness, Manual 2009MM, Revision 2a, dated January 17, 2007, or later FAA accepted revision is required for this modification. 3. The installer must determine whether this design change is compatible with previously approved modifications. 4. If the holder agrees to permit another person to use this certificate to alter a product, the holder must give the other person written evidence of that permission.

Snaky Creek Enterprises, LLC dba Spectrum Aeromed 1815 23rd Ave. North Fargo, ND 58102 A22CE Make : Cessna Aircraft Company Model : 500; 550; 560

Date of application : October 29, 1991

Date of issuance : August 12, 1993

Date reissued : August 6, 2007; October 23, 2008

Date amended : January 23, 2007

( Signature) Gregory J. Michalik, Senior Aerospace Engineer Airframe & Administrative Branch Chicago Aircraft Certification Office

( Title)

Original signed by:

Gregory J. Michalik

FAA FORM 8110-2-1(10-69) PAGE 2 of 2 PAGES

Number

## Every issue (3)

- May 15, 2009: Surrendered, Current. [certificate](https://openairdocs.org/files/sha256/00/be/00be928f00e2a0cef7ca0a8e8942083277f55d19eb6ce1fbe9345da42c1361dc)
- August 6, 2007: Reissued, Historical. [certificate](https://openairdocs.org/files/sha256/00/be/00be928f00e2a0cef7ca0a8e8942083277f55d19eb6ce1fbe9345da42c1361dc)
- January 23, 2007: Amended, Historical. [certificate](https://openairdocs.org/files/sha256/cb/75/cb7567d0b970b37936ba7875c09381783206647cfb99757a84ff46f17da098a2)

---
From OpenAirDocs.org, an independent open copy of FAA and NTSB data. Only the Federal Register edition on govinfo.gov is the official legal text of an AD.