# STC ST04437AT - Type: Supplemental type certificate - Status: Current, Issued - Holder: Chippewa Aerospace Inc, United States - Description: Replacement/Upgrade of HT1000 NPR (Nav Processor Unit) and the HT9100 NPR - Applied: August 15, 2018 - Status date: December 18, 2018 - Product: Aircraft, Large Airplane - Certification basis: Part 21, Part 25, Part 26 - Data sheets: [TCDS A53EU](https://openairdocs.org/tcds/A53EU) - Certificate PDF: https://openairdocs.org/files/sha256/8a/c8/8ac861bd2997b0ed52b812898c7ee26f369f6f783b9a6767f4424bb76cded91c - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/8F23EAD1CE7766AF8625836A004EA6C2.0001 - DRS record last changed: December 5, 2025 - Page: https://openairdocs.org/stc/ST04437AT ## ADs that name it (0) None. ## Approved models (10) - ATR - GIE Avions de Transport Régional ATR42-200 ([TCDS A53EU](https://openairdocs.org/tcds/A53EU)) - ATR - GIE Avions de Transport Régional ATR42-300 ([TCDS A53EU](https://openairdocs.org/tcds/A53EU)) - ATR - GIE Avions de Transport Régional ATR42-320 ([TCDS A53EU](https://openairdocs.org/tcds/A53EU)) - ATR - GIE Avions de Transport Régional ATR42-500 ([TCDS A53EU](https://openairdocs.org/tcds/A53EU)) - ATR - GIE Avions de Transport Régional ATR72-101 ([TCDS A53EU](https://openairdocs.org/tcds/A53EU)) - ATR - GIE Avions de Transport Régional ATR72-102 ([TCDS A53EU](https://openairdocs.org/tcds/A53EU)) - ATR - GIE Avions de Transport Régional ATR72-201 ([TCDS A53EU](https://openairdocs.org/tcds/A53EU)) - ATR - GIE Avions de Transport Régional ATR72-202 ([TCDS A53EU](https://openairdocs.org/tcds/A53EU)) - ATR - GIE Avions de Transport Régional ATR72-211 ([TCDS A53EU](https://openairdocs.org/tcds/A53EU)) - ATR - GIE Avions de Transport Régional ATR72-212 ([TCDS A53EU](https://openairdocs.org/tcds/A53EU)) ## 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. United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate Possessi on of this Supplemental Type Certificate (STC) document by persons other than the STC holder does not constitute rights to the design data nor to alter an aircraft, aircraft engine, or propeller. The STC’s supporting documentation (drawings, instructions, specifications, flight manual supplements, etc.) is the property of the ST C holder. FAA Form 8110-2 (5/14) Page 1 of 3 Number: ST04437AT This certificate issued to: Chippewa Aerospace, Inc. 490 Allied Dr. Conway, SC 29526 Part 25of the Federal Aviation Regulations. Original Product – Type Certificate Number: A53EU Make: ATR - GIE Avions de Transport Régional Model: ATR42-200, ATR42-300, ATR42-320, ATR42-500, ATR72-101, ATR72-201, ATR72- 102, ATR72-202, ATR72-211, ATR72-212 Series Description of Type Design: Replacement/Upgrade of HT1000 NPR (Nav Processor Unit) and the HT9100 NPR in accordance with Chippewa Aerospace Master Drawing List (MDL) No. 42-3461-01-0001, Rev IR, Dated August 26, 2018, or later FAA approved revision. Limitations and Conditions: This approval should not be extended to other aircraft of this model on which other previously approved modifications are incorporated, unless it is determined by the installer that the interrelationship between this change and any other previously approved modifications will produce no adverse effect upon the airworthiness of that airplane. If the holder agrees to permit another person to use this certificate to alter their product, the holder shall give the other person written evidence of that permission. (Limitations and Conditions continued on page 3 of 3.) Date of Application: August 15, 2018 Date Reissued: Date of Issuance: December 18, 2018 Date Amended: Signature Title (for) Christina Underwood, Office Manager Atlanta Aircraft Certification Office FAA Form 8110-2 (5/14) Page 2 of 3 Transfer the ownership of Supplemental Type Certificate Number: ST04437AT To (Name and address of transferee) From (Name and address of grantor) FAA Form 8110-2 (5/14) Page 3 of 3 Number: ST04437AT Instructions for Continued Airworthiness (ICA), Chippewa Aerospace Inc. Document No. 42-3461-01-0002, Rev IR, Dated August 2, 2018, or later FAA accepted revision must be made available to the operator at the time of installation. Certification Basis: Based on 14 CFR §§ 21.115 and 21.101, and the FAA policy for significant changes in FAA Order 8110.48, the certification basis for the ATR – GIE Avions de Transport Régional ATR42-200, ATR42-300, ATR42-320, ATR42-500, ATR72-101, ATR72-201, ATR72-102, ATR72-202, ATR72-211 and ATR72-212 Series aircraft is as follows: a. The type certification basis for the ATR – GIE Avions de Transport Régional ATR42-200, ATR42- 300, ATR42-320, ATR42-500, ATR72-101, ATR72-201, ATR72-102, ATR72-202, ATR72-211 and ATR72-212 airplane is shown on TCDS A53EU for parts not changed or not affected by the change. b. The certification basis for parts changed or affected by the change since the reference date of application, August 15, 2018, is based upon part 25 as amended by Amendment 25-145. Based on 14 CFR §§ 21.115 and 21.101, and the FAA policy for significant changes in FAA Order 8110.48, the certification basis for this modification was determined to be: Regulations at the latest amendment 25-0 through 25-145 §§ 25.301 §§ 25.303 §§ 25.305 §§ 25.307 §§ 25.561 §§ 25.869 §§ 25.899 §§ 25.1301 §§ 25.1307 §§ 25.1309 §§ 25.1316 §§ 25.1317 §§ 25.1351 §§ 25.1353 §§ 25.1431 §§ 25.1519 §§ 25.1525 §§ 25.1529 §§ 25.1541 14 CFR Part 26 Regulations Based on 14 CFR §21.101 (g), applicable provisions of 14 CFR Part 26 are included in the certification basis. For a future 14 CFR Part 26 amendments, the holder of this STC must demonstrate compliance with the applicable sections. As of issuance date of this STC, compliance has been found for the following regulations: 14 CFR § 26.11 and 14 CFR § 26.47. --------------------------END--------------------------- ## Every issue (1) - December 18, 2018: Issued, Current. [certificate](https://openairdocs.org/files/sha256/8a/c8/8ac861bd2997b0ed52b812898c7ee26f369f6f783b9a6767f4424bb76cded91c) --- 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.