# STC SR01839SE

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: Helicopter Transport Services LLC, United States
- Description: Remove the components from the hydraulic sled at Station 380 and install on the sled at Station 435.5, and remove the sled at Station 380,
- Applied: October 27, 2003
- Status date: January 9, 2014
- Product: Aircraft, Rotorcraft
- Certification basis: Part 21
- Data sheets: [TCDS H14NM](https://openairdocs.org/tcds/H14NM)
- Certificate PDF: https://openairdocs.org/files/sha256/ee/f5/eef54560ac0ef345ca9f0e4f87ede0d68a5f5b9814dac9031ea1ae014a306f18
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/E2858D0FFF5F778686257C5C0073A1A6.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SR01839SE

## ADs that name it (0)

None.

## Approved models (1)

- Helicopter Transport Services Inc. CH-54B ([TCDS H14NM](https://openairdocs.org/tcds/H14NM))

## 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.

Number SR01839SE

This certificate, issued to Helicopter Transport Services, LLC 14497 Keil Road NE Aurora, OR 97002

Part 21.25(a)(2) of the Federal Aviation Regulations.

Original ProductType Certificate Number: H14NM Make: Helicopter Transport Services Model: CH-54B

Description of the Type Design Change: Remove the components from the hydraulic sled at Station 380 and install on the sled at Station 435.5, and remove the sled at Station 380, in accordance with Helicopter Transport Services, Inc., (HTSI) Master Drawing List No. HTS-SLEDMDL-001, Revision IR, dated November 6, 2003, or later Federal Aviation Administration (FAA) approved revision. Record in the rotorcraft’s log book the weight and balance change provided in document HST-SLEDID-001, Revision IR, dated September 25, 2003, or later FAA-approved revision. This modification must be maintained in accordance with the already approved maintenance requirements for the hydraulic components and their installation.

Limitations and Conditions: Approval of this change in type design applies to HTSI Model CH54B rotorcraft only. This modification is transparent to the operation of the helicopter and therefore does not require a Rotorcraft Flight Manual Supplement. A copy of this certificate must be maintained as part of the permanent record of the modified helicopter.

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.

Date of application: October 27, 2003 Date reissued: January 9, 2014 Date of issuance: May 2, 2008 Date amended:

(Signature)

Manager, Seattle Aircraft Certification Office (Title)

## Every issue (2)

- January 9, 2014: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/ee/f5/eef54560ac0ef345ca9f0e4f87ede0d68a5f5b9814dac9031ea1ae014a306f18)
- May 2, 2008: Issued, Historical. [certificate](https://openairdocs.org/files/sha256/3f/d8/3fd87325385da2cee27f85f2f7c8b77486c75a80471d61e87df419b4a2330c2f)

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