# STC SA1024SO

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: Carpe Diem Aviation Services of Missouri, Inc. dba CD Aviation Services, United States
- Description: Installation of AiResearch TPE331-5-252K engines replacing AiResearch TPE331-5-251K engines.
- Applied: June 19, 1978
- Status date: April 6, 2026
- Product: Aircraft, Small Airplane
- Data sheets: [TCDS 2A4](https://openairdocs.org/tcds/2A4)
- Certificate PDF: https://openairdocs.org/files/sha256/78/08/7808ae098e379355932286170a3860ec4c1357acee2f05cc43579619da7905cf
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID145982464520260506170846.0001
- DRS record last changed: May 6, 2026
- Page: https://openairdocs.org/stc/SA1024SO

## ADs that name it (0)

None.

## Approved models (3)

- Twin Commander Aircraft Corporation 690 ([TCDS 2A4](https://openairdocs.org/tcds/2A4))
- Twin Commander Aircraft Corporation 690A ([TCDS 2A4](https://openairdocs.org/tcds/2A4))
- Twin Commander Aircraft Corporation 690B ([TCDS 2A4](https://openairdocs.org/tcds/2A4))

## 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.

SA1024SO Carpe Diem Aviation Services of Missouri, Inc.

dba CD Aviation Services 2707 East 32nd Street, Suite 2 Joplin, MO 64804 Part 3 the Civil Air Regulations.

2A4 Twin Commander Aircraft Corporation

1. FAA approved Airplane Flight Manual Supplement, dated May 4,1981, for the Model 690, or FAA approved Airplane Flight Manual Supplement, dated June 1. 1980, for Model 690A or Pilot's Operating Handbook Supplement, dated June 18, 1980, for Model 690B is required with this STC.

(Continued on Page 3) 6/19/1978 7/8/1985 6/30/1994 4/6/2026 9/25/1978 1/9/1978 6/18/1980 5/4/1981

for Jason S. Deutschman Acting Manager, Central Certification Branch Compliance & Airworthiness Division Aircraft Certification Service 3 Installation of AiResearch TPE 331-5-252K engines replacing AiResearch TPE 331-5-251K engines in accordance with Garrett Corporation Engineering Report No. 91878, Amendment B, or later FAA approved revision, and all listed references and bulletins therein.

690, 690A, 690B See Type Certificate Data Sheet 2A4 for complete certification basis

SA1024SO 04/06/26 3

SA1024SO 04/06/26 Limitations and Conditions (continued):

2. This approval should not be extended to other aircraft of these models on which other previously approved modifications are incorporated unless it is determined by the installer that the interrelationship between this change and any of those other previously approved modifications will introduce no adverse effect upon the airworthiness of that aircraft.

3. 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.

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## Every issue (2)

- April 6, 2026: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/78/08/7808ae098e379355932286170a3860ec4c1357acee2f05cc43579619da7905cf)
- June 30, 1994: Reissued, Historical. [certificate](https://openairdocs.org/files/sha256/85/4f/854f05c35e334232095ff66ccdc4da2da336f15ef0fcaf095d115517751c4fa2)

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