# STC SE00014EN - Type: Supplemental type certificate - Status: Current, Reissued - Holder: Pratt & Whitney Engine Services Inc., United States - Description: Installation of the Pratt & Whitney Engine Services, Inc. CrossCheck Engine Monitor Kit P/N HUMS-K-071-1, Rev. A on the specified PT6A engine models and kit P/N HUMS-K-071-2 on the specified A250 engine models. - Applied: September 20, 1995 - Status date: October 22, 2007 - Product: Engine - Certification basis: Part 33 - Data sheets: [TCDS E4EA](https://openairdocs.org/tcds/E4EA), [TCDS E4CE](https://openairdocs.org/tcds/E4CE), [TCDS E1GL](https://openairdocs.org/tcds/E1GL) - Certificate PDF: https://openairdocs.org/files/sha256/4a/7a/4a7aa21e64742e0c0c8f489d855cac8edc5f7cc15f18e19e9ce7b0f1c574d722 - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID167709712220230224154541.0001 - DRS record last changed: December 5, 2025 - Page: https://openairdocs.org/stc/SE00014EN ## ADs that name it (0) None. ## Approved models (54, first 50) - Allison Engine Company Inc. 250-C20B ([TCDS E4CE](https://openairdocs.org/tcds/E4CE)) - Allison Engine Company Inc. 250-C20F ([TCDS E4CE](https://openairdocs.org/tcds/E4CE)) - Allison Engine Company Inc. 250-C20J ([TCDS E4CE](https://openairdocs.org/tcds/E4CE)) - Allison Engine Company Inc. 250-C20R ([TCDS E4CE](https://openairdocs.org/tcds/E4CE)) - Allison Engine Company Inc. 250-C20R/1 ([TCDS E4CE](https://openairdocs.org/tcds/E4CE)) - Allison Engine Company Inc. 250-C20R/2 ([TCDS E4CE](https://openairdocs.org/tcds/E4CE)) - Allison Engine Company Inc. 250-C20R/4 ([TCDS E4CE](https://openairdocs.org/tcds/E4CE)) - Allison Engine Company Inc. 250-C20W ([TCDS E4CE](https://openairdocs.org/tcds/E4CE)) - Pratt & Whitney Canada Inc. PT6A-11 ([TCDS E4EA](https://openairdocs.org/tcds/E4EA)) - Pratt & Whitney Canada Inc. PT6A-110 ([TCDS E4EA](https://openairdocs.org/tcds/E4EA)) - Pratt & Whitney Canada Inc. PT6A-112 ([TCDS E4EA](https://openairdocs.org/tcds/E4EA)) - Pratt & Whitney Canada Inc. PT6A-114 ([TCDS E4EA](https://openairdocs.org/tcds/E4EA)) - Pratt & Whitney Canada Inc. PT6A-114A ([TCDS E4EA](https://openairdocs.org/tcds/E4EA)) - Pratt & Whitney Canada Inc. PT6A-11AG ([TCDS E4EA](https://openairdocs.org/tcds/E4EA)) - Pratt & Whitney Canada Inc. PT6A-135 ([TCDS E4EA](https://openairdocs.org/tcds/E4EA)) - Pratt & Whitney Canada Inc. PT6A-135A ([TCDS E4EA](https://openairdocs.org/tcds/E4EA)) - Pratt & Whitney Canada Inc. PT6A-15AG ([TCDS E4EA](https://openairdocs.org/tcds/E4EA)) - Pratt & Whitney Canada Inc. PT6A-20 ([TCDS E4EA](https://openairdocs.org/tcds/E4EA)) - Pratt & Whitney Canada Inc. PT6A-20A ([TCDS E4EA](https://openairdocs.org/tcds/E4EA)) - Pratt & Whitney Canada Inc. PT6A-20B ([TCDS E4EA](https://openairdocs.org/tcds/E4EA)) - Pratt & Whitney Canada Inc. PT6A-21 ([TCDS E4EA](https://openairdocs.org/tcds/E4EA)) - Pratt & Whitney Canada Inc. PT6A-25 ([TCDS E4EA](https://openairdocs.org/tcds/E4EA)) - Pratt & Whitney Canada Inc. PT6A-25A ([TCDS E4EA](https://openairdocs.org/tcds/E4EA)) - Pratt & Whitney Canada Inc. PT6A-25C ([TCDS E4EA](https://openairdocs.org/tcds/E4EA)) - Pratt & Whitney Canada Inc. PT6A-27 ([TCDS E4EA](https://openairdocs.org/tcds/E4EA)) - Pratt & Whitney Canada Inc. PT6A-28 ([TCDS E4EA](https://openairdocs.org/tcds/E4EA)) - Pratt & Whitney Canada Inc. PT6A-34 ([TCDS E4EA](https://openairdocs.org/tcds/E4EA)) - Pratt & Whitney Canada Inc. PT6A-34AG ([TCDS E4EA](https://openairdocs.org/tcds/E4EA)) - Pratt & Whitney Canada Inc. PT6A-34B ([TCDS E4EA](https://openairdocs.org/tcds/E4EA)) - Pratt & Whitney Canada Inc. PT6A-36 ([TCDS E4EA](https://openairdocs.org/tcds/E4EA)) - Pratt & Whitney Canada Inc. PT6A-38 ([TCDS E4EA](https://openairdocs.org/tcds/E4EA)) - Pratt & Whitney Canada Inc. PT6A-40 ([TCDS E4EA](https://openairdocs.org/tcds/E4EA)) - Pratt & Whitney Canada Inc. PT6A-41 ([TCDS E4EA](https://openairdocs.org/tcds/E4EA)) - Pratt & Whitney Canada Inc. PT6A-41AG ([TCDS E4EA](https://openairdocs.org/tcds/E4EA)) - Pratt & Whitney Canada Inc. PT6A-42 ([TCDS E4EA](https://openairdocs.org/tcds/E4EA)) - Pratt & Whitney Canada Inc. PT6A-45A ([TCDS E4EA](https://openairdocs.org/tcds/E4EA)) - Pratt & Whitney Canada Inc. PT6A-45B ([TCDS E4EA](https://openairdocs.org/tcds/E4EA)) - Pratt & Whitney Canada Inc. PT6A-45R ([TCDS E4EA](https://openairdocs.org/tcds/E4EA)) - Pratt & Whitney Canada Inc. PT6A-50 ([TCDS E4EA](https://openairdocs.org/tcds/E4EA)) - Pratt & Whitney Canada Inc. PT6A-6 ([TCDS E4EA](https://openairdocs.org/tcds/E4EA)) - Pratt & Whitney Canada Inc. PT6A-60 ([TCDS E4EA](https://openairdocs.org/tcds/E4EA)) - Pratt & Whitney Canada Inc. PT6A-60A ([TCDS E4EA](https://openairdocs.org/tcds/E4EA)) - Pratt & Whitney Canada Inc. PT6A-61 ([TCDS E4EA](https://openairdocs.org/tcds/E4EA)) - Pratt & Whitney Canada Inc. PT6A-65AG ([TCDS E4EA](https://openairdocs.org/tcds/E4EA)) - Pratt & Whitney Canada Inc. PT6A-65AR ([TCDS E4EA](https://openairdocs.org/tcds/E4EA)) - Pratt & Whitney Canada Inc. PT6A-65B ([TCDS E4EA](https://openairdocs.org/tcds/E4EA)) - Pratt & Whitney Canada Inc. PT6A-65R ([TCDS E4EA](https://openairdocs.org/tcds/E4EA)) - Pratt & Whitney Canada Inc. PT6A-6A ([TCDS E4EA](https://openairdocs.org/tcds/E4EA)) - Pratt & Whitney Canada Inc. PT6A-6B ([TCDS E4EA](https://openairdocs.org/tcds/E4EA)) - Rolls-Royce Corporation 250-C28B ([TCDS E1GL](https://openairdocs.org/tcds/E1GL)) All 54: https://openairdocs.org/stc/SE00014EN/models.md ## What the certificate says This is OCR from the scanned FAA certificate. OCR can misread letters and numbers. United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate Number: SE00014EN This certificate issued to: to: Pratt & Whitney Engine Services, Inc. 249 Vanderbilt Ave Norwood, MA 02062 Part 33 of thie Tederut. Ariation Regulations. Original Product Type Certificate Vander: E4EA Abute : PRATT & WHITNEY CANADA PT6A (See attached list) Model: Allison A250 (Sec attached list) Description of Type Design Change: Installation of the Pratt & Whitney Engine Services, Inc. CrossCheck Engine Monitor Kit P/IN HUMS-K-071-1, Rev. A on the specified PT6A engine models and kit P/N HUMS-K-071-2 on the specified A250 engine models. Installation on the PIA engine models is to be accomplished in accordance with CrossCheck Engine Monitor Installation Manual, Version 2.1, dated March 18, 1997, and installation on the A250 engine models is to be accomplished in accordance with Installation Manual Document Number HUMS-1-071-2, Version 1.2, dated July 2, 1997. Limitations and Conditions: . 1. The CrossCheck Monitor is designed as non-essential equipment and cannot be used to replace or supplement manual recording of engine operating data required by the FAA approved operating specifications and maintenance programs. 2. This approval should not be incorporated in any engines of these models on which other previously approved modifications are incorporated, unless it is determined that the inter-relationship betwcen this change and any of those previously approved modification will introduce no adverse effect upon the airworthiness of those airctaft. 3. 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: September 20, 1995 Date Reissued: August 21, 2002, October 22, 2007 Date of Issuance: November 03,1995 Lude umended: September 09, 1997 FEDERAL AVIATION By Direction of the Administrator (Signature) Diane M. Cook TOMINSTRATO Manager, Engine Certification Branch Aircraft Certification Office (Title) any alteration of this FAA Forn 8110-2 (10-68) Page 1 of 3 United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate (Continuation Sheet) Number: SE00014EN Limitations and Conditions: CONTINUATION SHEET FOR SE00014EN PRATT & WHITNEY CANADA PTA ENGINE MODELS: PT6A-6 PT6A-45R PT6A-6A PT6A-50 PT6A-6B PT6A-60 PT6A-11 PT6A-60A PT6A-11AG PT6A-61 PT6A-15AG PT6A-62 PT6A-20 PT6A-64 PT6A-20A PT6A-65AG PT6A-20B PT6A-65AR PT6A-21 PT6A-65B PT6A-25 PT6A-65R PT6A-25A PT6A-66 PT6A-25C PT6A-67 PT6A-27 PT6A-67A PT6A-28 PT6A-67AF PT6A-34 PT6A-67AG PT6A-34AG PT6A-67B PT6A-34B PT6A-67D PT6A-36 PT6A-67R PT6A-38 PT6A-110 PT6A-40 PT6A-112 PT6A-41 PT6A-114 PT6A-41AG PT6A-114A PT6A-42 PT6A-114A PT6A-45A PT6A-135 PT6A-45AG PT6A-135A PT6A-45B Page 2 of 3 Number: SE00014EN Limitations and Conditions: **CONTINUATION SHEET FOR SE0014EN** ALLISON ENGINE MODELS A250-C20 A250-C20B A250-C20F A250-C20J A250-C20R A250-C20R/1 A250-C20R/2 A250-C20R/4 A250-C20W A250-C28B A250-C28C A250-C30 A250-C30G A250-C30P A250-C30S 4421 22 Diane M. Cook Manager, Engine Certification Branch Aircraft Certification Office Page 3 of 3 ## Every issue (1) - October 22, 2007: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/4a/7a/4a7aa21e64742e0c0c8f489d855cac8edc5f7cc15f18e19e9ce7b0f1c574d722) --- 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.