# N27WP: 2019 William M Oprendek PITTS S1S - Status: Valid registration - Airframe: [William M Oprendek PITTS S1S](https://openairdocs.org/model/william-m-oprendek-pitts-s1s) (registry code 05632LV, 1 seats) - Engine: [Superior IO-360 series](https://openairdocs.org/engine/superior-io-360-series) (registry code 59251) - Data sheets: [TCDS E00001SC](https://openairdocs.org/tcds/E00001SC) (Superior Air Parts Inc.) (OpenAirDocs) - Serial number: S1SS-4 - Year built: 2019 - Type: Fixed wing single engine - Engine type: Reciprocating - Airworthiness: Experimental, amateur built - Airworthiness date: May 13, 2020 - Certificate issued: November 12, 2025 - Expires: November 30, 2032 - Mode S code: A2A625 - Owner type: Individual - FAA registry: https://registry.faa.gov/AircraftInquiry/Search/NNumberResult?nNumberTxt=27WP - Page: https://openairdocs.org/aircraft/N27WP From the FAA registry file of October 24, 2026. ADs below are matched by the registry's airframe and engine model codes. They may apply; each AD's applicability can narrow it by serial number, part number or installed equipment. This is not a compliance determination. The registry lists only the engine series, so ADs for every Superior IO-360 model are included. ## ADs that may apply (OpenAirDocs): 3 in force ### Matched by airframe (William M Oprendek PITTS S1S) None in force. ### Matched by engine (Superior IO-360 series) - [AD 2020-25-12](https://openairdocs.org/ad/2020-25-12): Reciprocating Engine Power Section · Superior Air Parts IO-360-A1A1, IO-360-A1A2, IO-360-A2A1 and 146 more. Effective Jan 15, 2021 - [AD 2012-03-06](https://openairdocs.org/ad/2012-03-06): Fuel servo diaphragm · Continental Motors 6-260-A, 6-285-A, 6-285-B and 482 more. Effective Feb 24, 2012 - [AD 2009-02-03](https://openairdocs.org/ad/2009-02-03): Fuel injection servos · Lycoming Engines AEIO-320-D1B, AEIO-320-D2B, AEIO-320-E1A and 261 more. Effective Feb 9, 2009 ### Historical (superseded or no longer in force) - [AD 2011-15-10](https://openairdocs.org/ad/2011-15-10) (historical): Fuel servos · Lycoming Engines AEIO-320-D1B, AEIO-320-D2B, AEIO-320-E1A and 256 more. Effective Aug 16, 2011 - [AD 2008-08-14](https://openairdocs.org/ad/2008-08-14) (historical): Fuel injection servo plugs · Superior Air Parts AEIO-320-D1B, AEIO-320-D2B, AEIO-320-E1A and 242 more. Effective Apr 29, 2008 - [AD 2008-06-51](https://openairdocs.org/ad/2008-06-51) (historical): Fuel injection servo plugs · Lycoming Engines AEIO-320-D1B, AEIO-320-D2B, AEIO-320-E1A and 235 more ## Information bulletins (advisory) (1 in force) - [SAIB NE-09-04](https://openairdocs.org/saib/NE-09-04): Fuel Control/Reciprocating Engines. Issued Jan 10, 2009 ## NTSB investigations None matched to N27WP. ## FAA accident and incident reports None matched to N27WP. ## Service difficulty reports None filed for this aircraft. Matched to this aircraft by N-number and event date, checked against the reported serial number, make and model. ## Service difficulty reports on N27WP not matched to an aircraft (2) They name N27WP, but no registry record covers the date, the aircraft registered then was built later, or the report describes another aircraft. - [SDR 2009FA0001025](https://openairdocs.org/sdr/2009FA0001025), Dec 7, 2009: OUTFLOW VALVE. DEFECTIVE. DURING APPROACH AT 4000MSL THE PILOT LOST PRESSURIZATION CONTROL IN THE AUTO AND MANUAL MODE. A "MAX DIFF" CAS MESSAGE WAS DISPLAYED. - [SDR 20000517SH001](https://openairdocs.org/sdr/20000517SH001), Feb 24, 2000: SENSOR. LOOSE. FLIGHT CREW REPORTED ENCOUNTERING COMPRESSOR STALLS AND AIRCRAFT YAW TO LEFT CLIMBING THROUGH FL 230. LEFT ENGINE CONTROLS MOVED TO FLIGHT IDLE AND SHUT DOWN LT ## STCs that may be installed (OpenAirDocs) (4) Approved for this aircraft's airframe or engine model, in force first, then newest. The registry doesn't record which STCs an aircraft has; its records do. ### Approved for the engine (Superior IO-360 series) - [STC SE04651CH](https://openairdocs.org/stc/SE04651CH): To allow use of l00R grade aviation fuel meeting Swift Fuel, LLC specification SPEC-l00R-22. Swift Fuels LLC - [STC SE04349CH](https://openairdocs.org/stc/SE04349CH): Installation of SureFly electronic ignition. SureFly Partners Ltd. Lists IO-360-A1A1 - [STC SE04577CH](https://openairdocs.org/stc/SE04577CH): Install an electronic engine ignition system. Electroair Acquisition Corp. Lists IO-360-A1A1 - [STC SE02409AK](https://openairdocs.org/stc/SE02409AK): Installation of the Superior Air Parts Cold Air Induction System (CAIS). Wattum Aircraft Services ## Earlier aircraft with N27WP The FAA can reassign an N-number once a registration is cancelled. These aircraft carried N27WP before. - [Cancelled 2020-04-09](https://openairdocs.org/deregistered/N27WP-2020-04-09): Dennis Harvan WOLF PITTS S1-SX, S/N S1-SX-001. Owner: [Harvan Dennis E](https://openairdocs.org/faa-owner/HARVAN%20DENNIS%20E), [Califon, NJ](https://openairdocs.org/faa-place/NJ/Califon) ## Related - Other William M Oprendek PITTS S1S aircraft: https://openairdocs.org/model/william-m-oprendek-pitts-s1s/aircraft.md - The Superior IO-360 series engine: https://openairdocs.org/engine/superior-io-360-series.md --- 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.