# STC SA3937NM - Type: Supplemental type certificate - Status: Current, Amended - Holder: California Precision Hydraulics Inc, United States - Description: Installation of Bell Industries Piston-Shoe Sub-assembly, Part No. 700001 as a replacement part for Sundstrand Part No. 728638, 700631, or SD1334 when used in Sundstrand Model No. 60AGD04 Constant Speed Drives (CSD). Part No. 700001 to be in accordance with Bell Industries Drawing No. 700001-A, -C, -D, -H, -J, and -L, Revision "A", dated December 17, 1984, or later FAA approved revisions. See continuation sheet. - Applied: February 3, 1988 - Status date: October 7, 2003 - Product: Aircraft, Large Multi-Engine - Certification basis: Part 21 - Data sheets: [TCDS A6WE](https://openairdocs.org/tcds/A6WE) - Certificate PDF: https://openairdocs.org/files/sha256/21/25/2125c276a9664cb4647cbf4ff99d1c5899878a815d28543c2abf21e51d78b89c - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/C5BCCA361051E83586256E7E006BB5F2.0001 - DRS record last changed: December 6, 2025 - Page: https://openairdocs.org/stc/SA3937NM ## ADs that name it (0) None. ## Approved models (4) - McDonnell Douglas Corporation DC-9-51 ([TCDS A6WE](https://openairdocs.org/tcds/A6WE)) - McDonnell Douglas Corporation DC-9-81 ([TCDS A6WE](https://openairdocs.org/tcds/A6WE)) - McDonnell Douglas Corporation DC-9-82 ([TCDS A6WE](https://openairdocs.org/tcds/A6WE)) - McDonnell Douglas Corporation MD-88 ([TCDS A6WE](https://openairdocs.org/tcds/A6WE)) ## 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 SA3937NM This Certificate issued to Part 4b* of the Civil Air Regulations. *Certification basis is set forth in Type Certificate Data Sheet (TCDS) Installation of Bell Industries Piston-Shoe Sub-assembly, Part No. 700001 as a replacement part for Sundstrand Part No. 728638, 700631, or SD1334 when u sed in Sundstrand Model No. 60AGD04 Constant Speed Drives (CSD). Part No. 700001 to be in accordance with Bell Industries Drawing No. 700001-A, -C, -D, -H, -J, and -L, Revision “A”, dated December 17, 1984, or later FAA approved revisions. See continuation sheet. The approval of this change in type design appli es only to the Model No. 60AGD04 CSD installed in the above-listed airplane models. This approval should not be extended to aircraft of these models that incorporate any other previously approved modificati on unless it is determined the interrelationship between this change and any other modification will introduce no adverse effect on the airworthiness of these aircraft. If the holder agrees to permit another person to use this certificate to alter their airplane, the holder shall give the other person written evidence of that permission. **CALIFORNIA PRECISION HYDRAULICS, INC.** 5330 Derry Avenue, Suite B Agoura Hills, California 91301 A6WE McDonnell Douglas DC-9-50, DC-9-81, DC-9-82, MD-88 Date of application : February 3, 1988 Date of issuance : August3 1988 Date reissued : November 4, 1993, December 6, 1996 Date amended : June 19, 2003, October 7, 2003 By direction of the Administrator /s/ Thomas A. Enyart ( Signature) Manager, Propulsion Branch Los Angeles Aircraft Certification Office ( Title) NOTE: **DO NOT DELETE THIS PAGE.** **DO NOT ADD ANY DATA TO THIS PAGE.** **THIS PAGE IS FOR PAGE NUMBERING PURPOSES, PLEASE DISCARD PRINTED COPY.** Number SA3937NM Date of Application: February 3, 1988 Date Issued: August 3, 1988 Date Reissued: November 4, 1993, ownership change Date Reissued: December 6, 1996, address change Date Amended: June 19, 2003, to add model MD-88 Date Amended: October 7, 2003, to add P/N SD1334 Revision Log: Page No. 1 2 3 Rev. No. 2 - 2 Description of Type Design Change - continued: California Precision’s Drawing No. 700001-A, -C, -D, -H, -J, and -L Piston-Shoe Sub-assembly (formerly Bell Industries) consists of: 700001-63 Shoe, Revision “A”, dated December 20, 1984, or later FAA approved revision. 700001-62A, -62C, -62D, -62H, -62J, and -62L Piston, Revision “A”, dated April 27, 1987, or later FAA approved revision. 700001-62 ( ) Piston, consists of: 700001-62-1 Sleeve, Revision “N/C”. dated Apr il 23, 1987, or later FAA approved revision. 700001-62-2 Core, Revision “N/C”, dated April 23, 1987, or later FAA approved revision. NOTE: Letter code designations A, C, D, H, J, and L denote piston diameter variations which are used on installation to obtain acceptable piston to cylinder bore clearance. A copy of this certificate must be maintained as part of the permanent records of the modified airplane. -END- ## Every issue (1) - October 7, 2003: Amended, Current. [certificate](https://openairdocs.org/files/sha256/21/25/2125c276a9664cb4647cbf4ff99d1c5899878a815d28543c2abf21e51d78b89c) --- OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.