# N23DF: 1944 Beech C18S

- Status: Valid registration
- Airframe: [Beech C18S](https://openairdocs.org/model/beech-c18s) (registry code 1150902, 10 seats)
- Engine: [Pratt & Whitney R-985 series](https://openairdocs.org/engine/pratt-whitney-r-985-series) (registry code 52008)
- Data sheets: [TCDS A-757](https://openairdocs.org/tcds/A-757) (Textron Aviation Inc.) (OpenAirDocs)
- Serial number: 6220
- Year built: 1944
- Type: Fixed wing multi engine
- Engine type: Reciprocating
- Airworthiness: Standard, normal
- Airworthiness date: October 13, 1999
- Certificate issued: December 2, 2025
- Expires: December 31, 2032
- Mode S code: A20678
- Registered owner: [Simmons Aviation Services LLC](https://openairdocs.org/faa-owner/SIMMONS%20AVIATION%20SERVICES%20LLC)
- Location: [Pawcatuck, CT](https://openairdocs.org/faa-place/CT/Pawcatuck)
- Owner type: LLC
- Owner's area on the map: 41.3669° N, 71.8505° W: Placed by OpenAirDocs at the center of ZIP code 06379, within about 2 miles (OpenAirDocs). The owner's mailing address, not where the aircraft is based
- FAA registry: https://registry.faa.gov/AircraftInquiry/Search/NNumberResult?nNumberTxt=23DF
- Page: https://openairdocs.org/aircraft/N23DF

From the FAA registry file of October 21, 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 Pratt & Whitney R-985 model are included.

## ADs that may apply (OpenAirDocs): 14 in force

### Matched by airframe (Beech C18S)

- [AD 2023-10-02](https://openairdocs.org/ad/2023-10-02): Indicating/Recording System, Navigation · Boeing 18, 23, 35 and 1,060 more. Effective May 26, 2023
- [AD 75-27-09 R2](https://openairdocs.org/ad/75-27-09-R2): Wing Structure · Textron 18A, 18D, 18S (Army C-45C) and 27 more. Effective Aug 21, 1980
- [AD 77-19-07](https://openairdocs.org/ad/77-19-07): Control Column Assembly · Textron 18A, 18D, 18S (Army C-45C) and 27 more. Effective Sep 29, 1977
- [AD 65-03-01](https://openairdocs.org/ad/65-03-01): Gap Seal Strips · Recertification under subparts B &G of CAR 3 and installation… (Staggerwing Museum Foundation STC SA2-1016 or 7 others)
- [AD 53-26-01](https://openairdocs.org/ad/53-26-01): Ignition Switch · Briggs & Stratton Ignition Switches, Army AT-11, C18S and 3 more
- [AD 49-15-03](https://openairdocs.org/ad/49-15-03): Fuel Tank Vent System · Textron Army AT-11 and C18S
- [AD 48-51-01](https://openairdocs.org/ad/48-51-01): Control Wheel Shaft Inspection · Textron Army AT-11, C18S and D17S
- [AD 48-34-01](https://openairdocs.org/ad/48-34-01): Stabilizer Attachment Fittings · Textron Army AT-11, C18S, D18C and 2 more
- [AD 48-14-03](https://openairdocs.org/ad/48-14-03): Wing Center Section Spar · Textron Army AT-11 and C18S
- [AD 47-33-05](https://openairdocs.org/ad/47-33-05): Horizontal Stabilizer Spar · Textron Army AT-11, C18S and D18S
- [AD 47-33-04](https://openairdocs.org/ad/47-33-04): Fuel Leakage · Textron C18S
- [AD 47-33-03](https://openairdocs.org/ad/47-33-03): Tail Cone Drain Holes · Textron Army AT-11 and C18S
- [AD 47-06-09](https://openairdocs.org/ad/47-06-09): Landing Gear Retracting Mechanism · Textron Army AT-11 and C18S
- [AD 47-06-08](https://openairdocs.org/ad/47-06-08): Starter Solenoid and Buss Lead Wires · Textron Army AT-11 and C18S

### Matched by engine (Pratt & Whitney R-985 series)

None in force.

## Information bulletins (advisory)

None matched.

## NTSB investigations

None matched to N23DF.

## FAA accident and incident reports

None matched to N23DF.

## Service difficulty reports

None filed for this aircraft. Reports filed since November 16, 2016, when the mark's previous registration was cancelled.

## Earlier aircraft with N23DF

The FAA can reassign an N-number once a registration is cancelled. These aircraft carried N23DF before.

- [Cancelled 2016-11-16](https://openairdocs.org/deregistered/N23DF-2016-11-16): Grumman G-21A, S/N 1133, built 1942. Third renewal notice. Owner: [Worldwide Aviation Distributors Inc](https://openairdocs.org/faa-owner/WORLDWIDE%20AVIATION%20DISTRIBUTORS%20INC), [Miami, FL](https://openairdocs.org/faa-place/FL/Miami)

## Related

- Other Beech C18S aircraft: https://openairdocs.org/model/beech-c18s/aircraft.md
- STCs for the Beech C18S: https://openairdocs.org/model/beech-c18s/stcs.md
- The Pratt & Whitney R-985 series engine: https://openairdocs.org/engine/pratt-whitney-r-985-series.md

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