# STC SE4985NM - Type: Supplemental type certificate - Status: Current, Reissued - Holder: NorthPoint Aviation, United States - Description: Increase engine displacement. - Applied: May 12, 1991 - Status date: August 24, 2020 - Product: Engine - Data sheets: [TCDS E-273](https://openairdocs.org/tcds/E-273) - Certificate PDF: https://openairdocs.org/files/sha256/69/64/6964012cccd1fe5481f22a9807247aeb26f79877165078b5ba01bff58e1c8e50 - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/D0EFA3FE6F192D648625887C00113E0D.0001 - DRS record last changed: December 6, 2025 - Page: https://openairdocs.org/stc/SE4985NM ## ADs that name it (0) None. ## Approved models (6) - Teledyne Continental Motors O-470-K ([TCDS E-273](https://openairdocs.org/tcds/E-273)) - Teledyne Continental Motors O-470-L ([TCDS E-273](https://openairdocs.org/tcds/E-273)) - Teledyne Continental Motors O-470-M ([TCDS E-273](https://openairdocs.org/tcds/E-273)) - Teledyne Continental Motors O-470-R ([TCDS E-273](https://openairdocs.org/tcds/E-273)) - Teledyne Continental Motors O-470-S ([TCDS E-273](https://openairdocs.org/tcds/E-273)) - Teledyne Continental Motors O-470-U ([TCDS E-273](https://openairdocs.org/tcds/E-273)) ## 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. Part 13 of the Civil Air Regulations. Increase engine displacement in accordance with NorthPoint XP470 engine report No. 2, Revision E , dated June 15, 2020 or later FAA approved revision. Approval of this change in type design applies to the engine model listed above. This approval should not be extended to engi nes of these models on which other previously approved modifications are incorporated unless it is determined by the installer that the relationship between this change and any of these other previously approved modifications, including changes in type design, will introduce no adverse effects upon the airworthiness of that engine. A copy of this Certificate and the Continuation Sheet must be maintained as part of the permanent records for the modified engine. 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. NorthPoint Aviation 16384 Airport Road, Suite #8 Brainerd, MN 56401 E-273-35 Make : Teledyne Continental Motors Model: O-470-K, -L, -M, -R, -S, & -U Date reissued : November 20, 2003; March 21, 2019; August 24, 2020 Date amended: February 9, 1996, December 2, 2005, June 15, 2020 By direction of the Administrator (Signature) Roy E. Boffo III Manager, Propulsion and Project Management Section Chicago Aircraft Certification Office Branch Compliance and Airworthiness Division, FAA Date of application: May 12, 1991 Date of issuance: January 15, 1992 TRANSFER ENDORSEMENT Transfer the ownership of Supplemental Type Certificate Number to (Name of transferee) (Address of transferee) (Number and street) (City, State, and ZIP code) from (Name of grantor) (Print or type) (Address of grantor) (Number and street) (City, State, and ZIP code) Extent of Authority (if licensing agreement): Signature of grantor (In ink): FAA FORM 8110-2-1(10-69) PAGE 4 of 4 PAGES Number SE4985NM Date of issuance: January 15, 1992 Date Amended: February 9, 1996; December 2, 2005; June 15, 2020 Date Reissued: November 20, 2003; March 21, 2019; August 24, 2020 The conditions and limitations of Type Certificate Data Sheet No. E-273-35 apply except where superseded by the following: This Supplemental Type Certificate Addendum, which is part of STC SE4985NM, prescribes the conditions and limitations under which the product for which the STC was issued meets the airworthiness requirements of the Civil Air Regulations. A copy of this STC Addendum is required to be maintained as part of the permanent record for the modified aircraft. Teledyne Continental engine models O -470-K, -L, -M, -R, -S, and -U as modified by STC SE4985NM Engine Model: NorthPoint XP470 Rating, Takeoff 5 Minutes (NOTE 1): 235 HP @ 2700 RPM Maximum Continuous (NOTE 1): 235 HP @ 2700 RPM Fuel, aviation gasoline min. grade: 100/100LL Lubricating Oil : Per TCM specification MHS-24B for TSIO-520-C Bore and Stroke: 5.25 in * 4.00 in Displacement: 520 cu. In. Compression Ratio: 7.5 : 1 Weight (dry): Carburetion: 416 lbs. Carburetion: Marvel Schebler MA4-5 modified per NorthPoint XP470 Engine Report No. 2. Ignition, duel magnetos. Two Bendix S6RN-25 0 lbs. Eligible models and weight change One ea. Bendix S6RN-201 & -205 -1 lbs. Two Slick 662 or 680 0 lbs. Two Slick 6210 -5 lbs. FAA FORM 8110-2-1(10-69) PAGE 4 of 4 PAGES Number SE4985NM Date of issuance: January 15, 1992 Date Amended: February 9, 1996; December 2, 2005; June 15, 2020 Date Reissued: November 20, 2003; March 21, 2019; August 24, 2020 Timing: 22°BTC Spark Plugs: AC 273, 283, 2831R, 293 Champion RHB32E, RHB32N, RHB32P, RHB32S, REB32W, RHB33E Auto Lite SL350 Red Seal LJ360 Fuel Pressure Limits: 0.5 p.s.i. min. 6.0 p.s.i. max. NOTE 1 : Rating at sea level, ICAO standard atmosphere, all accessories unloaded, and horsepower measured at the propeller shaft. -----END---- ## Every issue (3) - August 24, 2020: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/69/64/6964012cccd1fe5481f22a9807247aeb26f79877165078b5ba01bff58e1c8e50) - March 21, 2019: Reissued, Historical. [certificate](https://openairdocs.org/files/sha256/1d/e2/1de21c07fd29b7edcf918a016fef310c3f5efde71c5ff740259896a600bebdfd) - March 22, 2001: Amended, Historical. [certificate](https://openairdocs.org/files/sha256/b6/0e/b60e7e50318913f3b73783772992ba96463efba2c8b202a6b70d1099efeadd9d) --- 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.