# STC SR01124LA

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: ASCENT POWER INC., United States
- Description: Installation of Pratt & Whitney PT6T-3DE, or -3DF Twin-Pac in place of PT6T-3 or PT6T-3B Twin-Pac
- Applied: December 1, 2000
- Status date: April 27, 2022
- Product: Aircraft, Rotorcraft
- Certification basis: Part 21, Part 29
- Data sheets: [TCDS H4SW](https://openairdocs.org/tcds/H4SW)
- Certificate PDF: https://openairdocs.org/files/sha256/84/fa/84fabf3464c59109f26d39cbd852452ea8c0efccfe29814b65a6fb1870a7ca16
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/02FBA9FF61F6B2288625883E004C73DF.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SR01124LA

## ADs that name it (0)

None.

## Approved models (1)

- Bell Helicopter Textron 212 ([TCDS H4SW](https://openairdocs.org/tcds/H4SW))

## 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.

FAA Form 8110-2 (4/20) SUPERSEDES PREVIOUS EDITION Page 1 of 2

Part 29* of the Federal Aviation Regulations.

*Certification basis is set forth in Type Certificate Data Sheet H4SW.

Description of Type Design Change: Installation of Pratt & Whitney PT6T-3DE, or -3DF Twin-Pac in place of PT6T-3 or PT6T-3B Twin-Pac, in accordance with Airlane Upgrades’ Installation Instruction AU-001207, Revision N/C, dated January 3, 2001, or later FAA approved revision. FAA Approved Rotorcraft Flight Manual Supplement No. AU-001206, dated January 12, 2001, or later FAA approved revision is required with this installation.

Limitations and Conditions: The installation should not be incorporated in any aircraft unless it is determined that the interrelationship between this installation and any previously approved configuration will not introduce any adverse effect upon the airworthiness of the aircraft. The limitation of the installed PT6T-3DE engine is the same performance and limits as the PT6T-3B and the limitations for installed PT6T-DF engine are: 1) the same performance and limits as the PT6T-3B, and 2) the optional OEI performance and limits of the PT6T-3DF. A copy of this STC must be included in the permanent records of the modified aircraft. If the holder agrees to permit another person to use this certificate to alter the product, the holder shall give the other person written evidence of that permission. NOTE: Noise characteristics: This installation has been determined not to increase the noise level and is not considered an “acoustical change” as defined in para. 21.93(b), Amend. 21-77 of the Federal Aviation Regulations.

Date of Application: Dec 1, 2000 Date Reissued: Oct 11, 2012, Aug 5, 2013, Oct 27, 2020, Apr 15, 2022 Date of Issuance: Jan 19, 2001 Date Amended: Oct 10, 2001, May 30, 2002 By Direction of the Administrator Signature:

Title: Aviation Safety Acting Manager, Technical & Administrative Support Section, Los Angeles ACO Branch

Number: SR01124LA This certificate issued to: ASCENT POWER INC.

485 South Rock Boulevard Reno, Nevada 84502 Original Product Type Certificate Number: *H4SW Make: Bell Model: 212

FAA Form 8110-2 (4/20) SUPERSEDES PREVIOUS EDITION Page 2 of 2 Number: SR01124LA

## Every issue (4)

- April 27, 2022: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/84/fa/84fabf3464c59109f26d39cbd852452ea8c0efccfe29814b65a6fb1870a7ca16)
- October 27, 2020: Reissued, Historical. [certificate](https://openairdocs.org/files/sha256/d4/dd/d4ddde0589a5c4a7816a5fcef912fff2692217ee73894d57aeec430be7d804b6)
- August 5, 2013: Reissued, Historical. [certificate](https://openairdocs.org/files/sha256/77/e1/77e1b0e6e990ef11ae69e114fe28379253fd33780e32825f37a0c9d9ebaa26bc)
- October 11, 2012: Reissued, Historical. [certificate](https://openairdocs.org/files/sha256/c0/a9/c0a942dba77fbe4863e18e8a8f898c21436cc87aafd01b4ce22c85918f3700a1)

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