# STCs that may be installed: Douglas DC-4

A list on [Douglas DC-4](https://openairdocs.org/model/douglas-dc-4.md).

In force first, then newest. The registry doesn’t record which STCs an aircraft has.

- [STC SA2622NM](https://openairdocs.org/stc/SA2622NM.md): Installation of Precise Flight Pulselite Control Unit in landing/taxi system. (767-200 B17) (DHC-8 101) · Precise Flight Inc.
- [STC SA863EA](https://openairdocs.org/stc/SA863EA.md): Incorporation of DME Corporation emergency evacuation slide lighting system · Astronics Luminescent Systems Inc
- [STC SA4-492](https://openairdocs.org/stc/SA4-492.md): Installation of VIP P/N's 104-1-B and 104-1-C engine mount cores. · FTG, Inc.
- [STC SA02268CH](https://openairdocs.org/stc/SA02268CH.md): Installation of Airwolf Filter Corp. Air Oil Separator · Airwolf Filter Corporation
- [STC SA01282NY](https://openairdocs.org/stc/SA01282NY.md): Installation of Airwolf remote mounted engine oil filter kit AFC-K015 on aircraft powered by Pratt & Whitney radial reciprocating engine Series R-985, R-1340 and R-1830. · Airwolf Filter Corporation
- [STC SA3254WE](https://openairdocs.org/stc/SA3254WE.md): Nose wheel installation. · United Aeronautical Corporation
- [STC SA3298WE](https://openairdocs.org/stc/SA3298WE.md): Bendix wheels and brakes installation. · United Aeronautical Corporation
- [STC ST334CH](https://openairdocs.org/stc/ST334CH.md): Installation of Superflite 102 fabric. · Aviation Products Systems Inc.
- [STC SA4-84](https://openairdocs.org/stc/SA4-84.md): Fiber gasket 4233666 in cowl flap actuating cylinder replaced with AN 6227-20 O ring. · Alaska Airlines Inc
- [STC SA1-115](https://openairdocs.org/stc/SA1-115.md): Installation of Chamberlain 1012 Series radomes. · Saint-Gobain Performance Plastics Corp
- [STC SA1-507](https://openairdocs.org/stc/SA1-507.md): 2012X Series radomes. · Saint-Gobain Performance Plastics Corp
- [STC SA1365GL](https://openairdocs.org/stc/SA1365GL.md): Surrendered and incorporated into STC ST334CH. · Cooper Aviation Supply Company, Inc.
- [STC SA5517NM](https://openairdocs.org/stc/SA5517NM.md): Limited to installation on serial numbers 27314 and 42994 ONLY. Installation of a Class "E" cargo compartment, removal of carburetor fluid anti-icing systems, and removal of cabin combustion heater. · Hawaii Pacific Air
- [STC SA3173WE](https://openairdocs.org/stc/SA3173WE.md): Installation of P&WA R-2000-6 engines in Douglas C54 airplanes. · Globe Air, Inc
- [STC SA1351WE](https://openairdocs.org/stc/SA1351WE.md): Replace existing fabric on wings, fuselage, empennage, and/or control surfaces, with Ceconite101 material. (262A Series -12) · Ceconite Inc
- [STC SA3423WE](https://openairdocs.org/stc/SA3423WE.md): Installation of 2000 gallon capacity external retardant tank under the fuselage at wing center section · California National Air Services, Inc.
- [STC SA3199WE](https://openairdocs.org/stc/SA3199WE.md): Cargo handling system installation. · Pemco Engineers, Inc
- [STC SA1744WE](https://openairdocs.org/stc/SA1744WE.md): Installation of oil filter assemblies. · Nelson Filter
- [STC SA196SO](https://openairdocs.org/stc/SA196SO.md): Installation of Wright Military Cyclone R-2600-35 engines (as modified per STC SE610SO or R-2600-35 engines having WAD P/N 417916 or 424010 gear boxes). · Charlotte Aircraft Corporation
- [STC SA1117WE](https://openairdocs.org/stc/SA1117WE.md): Wing flap operated aural warning system. · Potter Aircraft Svc Inc
- [STC SA7SO](https://openairdocs.org/stc/SA7SO.md): Radome and radar antennae mount provisions for up to 22-inch diameter antennae, RAC AVQ-10 or Bendix RDR-1 (X/C Band). · Tempo Design Corp
- [STC SA108SO](https://openairdocs.org/stc/SA108SO.md): B-600-1 oil separator. · Air Carrier Eng Service Inc
- [STC SA4-1399](https://openairdocs.org/stc/SA4-1399.md): Ceconite 101 covering of all fabric-covered surfaces. · Cooper Engineering Corporation
- [STC SA4-203](https://openairdocs.org/stc/SA4-203.md): Oil filter 1258-B86-C and element1258-OC on aircraft without UD3785 oil temperature regulator. · Winslow Aerofilter Corp
- [STC SA4-204](https://openairdocs.org/stc/SA4-204.md): Oil filter 1258-B-86-D and element1258-OC on aircraft with UD3785 oil temperature regulator. · Winslow Aerofilter Corp
- [STC SA4-317](https://openairdocs.org/stc/SA4-317.md): Auxiliary oil tank. · Transocean Airlines
- [STC SA4-365](https://openairdocs.org/stc/SA4-365.md): Emergency inpact light. · Transocean Airlines
- [STC SA4-372](https://openairdocs.org/stc/SA4-372.md): CO and smoke detection system in belly baggage compartments. · Twentieth Century Aircraft Co
- [STC SA4-414](https://openairdocs.org/stc/SA4-414.md): Emergency lighting. · California Eastern Aviation Inc
- [STC SA4-47](https://openairdocs.org/stc/SA4-47.md): Generator system changed from 100 ampere to 200 ampere. · California Eastern Aviation Inc
- [STC SA4-488](https://openairdocs.org/stc/SA4-488.md): Modification of bulkhead, Station 260. · Transocean Airlines
- [STC SA4-498](https://openairdocs.org/stc/SA4-498.md): Engine mount core assemblies. · Dow-Elco Inc
- [STC SA4-540](https://openairdocs.org/stc/SA4-540.md): C-O-Two smoke detector system in cargo pits. · Transocean Airlines
- [STC SA4-790](https://openairdocs.org/stc/SA4-790.md): C-O-Two smoke detector system in main cargo compartment and forward baggage compartment. · Transocean Airlines
- [STC SA4-843](https://openairdocs.org/stc/SA4-843.md): Cabin interior seating arrangement revised. · Transocean Airlines
- [STC SA4-9](https://openairdocs.org/stc/SA4-9.md): Interior arrangement for track mounted pay loader seat and new buffet. · Los Angeles Air Service
- [STC SA53SO](https://openairdocs.org/stc/SA53SO.md): B-500-1 oil separator. · Air Carrier Eng Service Inc
- [STC SA67SO](https://openairdocs.org/stc/SA67SO.md): Seat track. · Air International
- [STC SA3-258](https://openairdocs.org/stc/SA3-258.md): C-O-Two visual smoke detector, Type A1-V, P/N 74800. · Northwest Airlines Inc.
- [STC SA1-140](https://openairdocs.org/stc/SA1-140.md): Cockpit heater and air intake and blower mounting. · Butler Aviation

## The whole list in SQL

Runs in DuckDB 1.2 or later on the release's Parquet files over HTTPS:

```sql
SELECT s.stc_number, s.description, s.holder, s.status, s.status_date, m.matched_model
FROM (
  SELECT stc_number, min(matched_model) AS matched_model
  FROM 'https://openairdocs.org/data/latest/faa_aircraft_model_stc.parquet'
  WHERE aircraft_model_code IN ('3021502')
  GROUP BY stc_number
) m JOIN 'https://openairdocs.org/data/latest/faa_stc.parquet' s USING (stc_number)
ORDER BY s.status = 'Current' DESC, s.status_date DESC, s.stc_number
```

This list as a web page: https://openairdocs.org/model/douglas-dc-4/stcs

---
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.