STC Holder: Preferred Improvements LLC

The Aviation DataBase -- STC Selection System
Aviation DataSource, Inc.

No. of STCs: 29

STC Holder: Preferred Improvements LLC Address: 11234 Hackett Rd, Apple Creek, OH 44606, United States		Contact us to have your company added here!
STC No.: SA03393CH	Status: Historical	App Date: 09/10/2014	Rev Date: 03/19/2018
TC Nos.: A37CE,
Models: Textron Aviation Inc.: 208
ACO: Chicago ACO Branch, Tel: +1 (847) 294-7358
Installation of a Pratt and Whitney Canada, PT6A-140 Engine

STC Holder: Preferred Improvements LLC Address: 11234 Hackett Rd, Apple Creek, OH 44606, United States		Contact us to have your company added here!
STC No.: SA211CE	Status: Current	App Date: 01/24/1964	Rev Date: 12/13/2017
TC Nos.: A-618, A-669,
Models: The Boeing Company: DC3-G102, DC3-G102A, DC3-G103A, DC3-G202A, DC3A-S1C3G, DC3A-S1CG, DC3A-S4C4G, DC3A-SC3G, DC3A-SCG, DC3C-R-1830-90C, DC3C-S1C3G, DC3C-S4C4G, DC3C-SC3G, DC3D-R-1830-90C
ACO: AIR-760: Central Certification Branch CHI
A.P.U. Installation - Ranger Andover Model V-32D-2-1.

STC Holder: Preferred Improvements LLC Address: 11234 Hackett Rd, Apple Creek, OH 44606, United States		Contact us to have your company added here!
STC No.: SA3-113	Status: Current	App Date: 09/11/1957	Rev Date: 12/13/2017
TC Nos.: A-669,
Models: The Boeing Company: DC3C-R-1830-90C, DC3C-S1C3G, DC3C-S4C4G, DC3C-SC3G
ACO: AIR-760: Central Certification Branch CHI
Installation of RCA Model AVQ-10 radar antenna swingaway mount SK10136 (SA3-65).

STC Holder: Preferred Improvements LLC Address: 11234 Hackett Rd, Apple Creek, OH 44606, United States		Contact us to have your company added here!
STC No.: SA3-139	Status: Current	App Date: 11/11/1957	Rev Date: 12/13/2017
TC Nos.: A-669,
Models: The Boeing Company: DC3C-R-1830-90C, DC3C-S1C3G, DC3C-S4C4G, DC3C-SC3G
ACO: AIR-760: Central Certification Branch CHI
Installation of standard C-47 cargo door.

STC Holder: Preferred Improvements LLC Address: 11234 Hackett Rd, Apple Creek, OH 44606, United States		Contact us to have your company added here!
STC No.: SA3-15	Status: Current	App Date: 12/05/1956	Rev Date: 12/13/2017
TC Nos.: A-618, A-669,
Models: The Boeing Company: DC3-G102, DC3-G102A, DC3-G103A, DC3-G202A, DC3A-S1C3G, DC3A-S1CG, DC3A-S4C4G, DC3A-SC3G, DC3A-SCG, DC3C-R-1830-90C, DC3C-S1C3G, DC3C-S4C4G, DC3C-SC3G, DC3D-R-1830-90C
ACO: AIR-760: Central Certification Branch CHI
Installation of wheel well enclosure doors.

STC Holder: Preferred Improvements LLC Address: 11234 Hackett Rd, Apple Creek, OH 44606, United States		Contact us to have your company added here!
STC No.: SA3-307	Status: Current	App Date: 07/03/1958	Rev Date: 12/07/2018
TC Nos.: A-618, A-669,
Models: The Boeing Company: DC3-G102, DC3-G102A, DC3-G103A, DC3-G202A, DC3A-S1C3G, DC3A-S1CG, DC3A-S4C4G, DC3A-SC3G, DC3A-SCG, DC3C-R-1830-90C, DC3C-S1C3G, DC3C-S4C4G, DC3C-SC3G, DC3D-R-1830-90C
ACO: AIR-760: Central Certification Branch CHI
Installation of 145-gallon fuel tanks. Installation of 252-gallon fuel tanks.

STC Holder: Preferred Improvements LLC Address: 11234 Hackett Rd, Apple Creek, OH 44606, United States		Contact us to have your company added here!
STC No.: SA3-307	Status: Historical	App Date: 07/03/1958	Rev Date: 12/13/2017
TC Nos.: A-618, A-669,
Models: The Boeing Company: DC3-G102, DC3-G102A, DC3-G103A, DC3-G202A, DC3A-S1C3G, DC3A-S1CG, DC3A-S4C4G, DC3A-SC3G, DC3A-SCG, DC3C-R-1830-90C, DC3C-S1C3G, DC3C-S4C4G, DC3C-SC3G, DC3D-R-1830-90C
ACO: Chicago ACO Branch, Tel: +1 (847) 294-7358
Installation of 145-gallon fuel tanks. Installation of 252-gallon fuel tanks.

STC Holder: Preferred Improvements LLC Address: 11234 Hackett Rd, Apple Creek, OH 44606, United States		Contact us to have your company added here!
STC No.: SA3-422	Status: Current	App Date: 09/18/1959	Rev Date: 12/13/2017
TC Nos.: A-618, A-669,
Models: The Boeing Company: DC3-G102, DC3-G102A, DC3-G103A, DC3-G202A, DC3A-S1C3G, DC3A-S1CG, DC3A-S4C4G, DC3A-SC3G, DC3A-SCG, DC3C-R-1830-90C, DC3C-S1C3G, DC3C-S4C4G, DC3C-SC3G, DC3D-R-1830-90C
ACO: AIR-760: Central Certification Branch CHI
Installation of bird resistant windshield.

STC Holder: Preferred Improvements LLC Address: 11234 Hackett Rd, Apple Creek, OH 44606, United States		Contact us to have your company added here!
STC No.: SA3-434	Status: Current	App Date: 09/18/1959	Rev Date: 12/13/2017
TC Nos.: A-618, A-669,
Models: The Boeing Company: DC3-G102, DC3-G102A, DC3-G103A, DC3-G202A, DC3A-S1C3G, DC3A-S1CG, DC3A-S4C4G, DC3A-SC3G, DC3A-SCG, DC3C-R-1830-90C, DC3C-S1C3G, DC3C-S4C4G, DC3C-SC3G, DC3D-R-1830-90C
ACO: AIR-760: Central Certification Branch CHI
Picture window installation and standard window modification.

STC Holder: Preferred Improvements LLC Address: 11234 Hackett Rd, Apple Creek, OH 44606, United States		Contact us to have your company added here!
STC No.: SA3-461	Status: Current	App Date: 12/18/1959	Rev Date: 12/13/2017
TC Nos.: A-618, A-669,
Models: The Boeing Company: DC3-G102, DC3-G102A, DC3-G103A, DC3-G202A, DC3A-S1C3G, DC3A-S1CG, DC3A-S4C4G, DC3A-SC3G, DC3A-SCG, DC3C-R-1830-90C, DC3C-S1C3G, DC3C-S4C4G, DC3C-SC3G, DC3D-R-1830-90C
ACO: AIR-760: Central Certification Branch CHI
Installation of electrically driven emergency hydraulic pump.

STC Holder: Preferred Improvements LLC Address: 11234 Hackett Rd, Apple Creek, OH 44606, United States		Contact us to have your company added here!
STC No.: SA3-52	Status: Current	App Date: 02/22/1955	Rev Date: 12/13/2017
TC Nos.: A-618, A-669,
Models: The Boeing Company: DC3-G102, DC3-G102A, DC3-G103A, DC3-G202A, DC3A-S1C3G, DC3A-S1CG, DC3A-S4C4G, DC3A-SC3G, DC3A-SCG, DC3C-R-1830-90C, DC3C-S1C3G, DC3C-S4C4G, DC3C-SC3G, DC3D-R-1830-90C
ACO: AIR-760: Central Certification Branch CHI
Radome installation.

STC Holder: Preferred Improvements LLC Address: 11234 Hackett Rd, Apple Creek, OH 44606, United States		Contact us to have your company added here!
STC No.: SA3-78	Status: Current	App Date: 07/26/1957	Rev Date: 12/13/2017
TC Nos.: A-618, A-669,
Models: The Boeing Company: DC3-G102, DC3-G102A, DC3-G103A, DC3-G202A, DC3A-S1C3G, DC3A-S1CG, DC3A-S4C4G, DC3A-SC3G, DC3A-SCG, DC3C-R-1830-90C, DC3C-S1C3G, DC3C-S4C4G, DC3C-SC3G, DC3D-R-1830-90C
ACO: AIR-760: Central Certification Branch CHI
Alternate Tee-Bolt radome attachment for STC SA3-52 radome installation.

STC Holder: Preferred Improvements LLC Address: 11234 Hackett Rd, Apple Creek, OH 44606, United States		Contact us to have your company added here!
STC No.: SA3074NM	Status: Current	App Date: 07/23/1985	Rev Date: 02/24/2017
TC Nos.: A-669,
Models: The Boeing Company: DC3A-S1C3G, DC3C-S1C3G
ACO: AIR-760: Central Certification Branch CHI
This modification requires that the following two (2) placards be placed on the inside of the forward (L.H.) cargo door in full view of the cargo loading crew: MAXIMUM PAYLOAD CAPACITY -7500 lbs. or less, CARGO LOADING METHOD-Refer to FAA App Oper Handbk.

STC Holder: Preferred Improvements LLC Address: 11234 Hackett Rd, Apple Creek, OH 44606, United States		Contact us to have your company added here!
STC No.: SA4-220	Status: Current	App Date: 05/03/1957	Rev Date: 07/15/2016
TC Nos.: A-618, A-669,
Models: The Boeing Company: DC3-G102, DC3-G102A, DC3-G103A, DC3-G202A, DC3A-S1C3G, DC3A-S1CG, DC3A-S4C4G, DC3A-SC3G, DC3A-SCG, DC3C-R-1830-90C, DC3C-S1C3G, DC3C-S4C4G, DC3C-SC3G, DC3D-R-1830-90C
ACO: AIR-760: Central Certification Branch CHI
Installation of tail wheel cover and fairing

STC Holder: Preferred Improvements LLC Address: 11234 Hackett Rd, Apple Creek, OH 44606, United States		Contact us to have your company added here!
STC No.: SA4-220	Status: Historical	App Date: 05/03/1957	Rev Date: 02/25/2016
TC Nos.: A-618, A-669,
Models: The Boeing Company: DC3-G102, DC3-G102A, DC3-G103A, DC3-G202A, DC3A-S1C3G, DC3A-S1CG, DC3A-S4C4G, DC3A-SC3G, DC3A-SCG, DC3C-R-1830-90C, DC3C-S1C3G, DC3C-S4C4G, DC3C-SC3G, DC3D-R-1830-90C
ACO: Chicago ACO Branch, Tel: +1 (847) 294-7358
Installation of tail wheel cover and fairing

STC Holder: Preferred Improvements LLC Address: 11234 Hackett Rd, Apple Creek, OH 44606, United States		Contact us to have your company added here!
STC No.: SA4-228	Status: Current	App Date: 05/27/1957	Rev Date: 02/25/2016
TC Nos.: A-669,
Models: The Boeing Company: DC3A-S1C3G, DC3A-S1CG, DC3A-S4C4G, DC3A-SC3G, DC3A-SCG, DC3C-R-1830-90C, DC3C-S1C3G, DC3C-S4C4G, DC3C-SC3G, DC3D-R-1830-90C
ACO: AIR-760: Central Certification Branch CHI
Main landing gear doors, actuating system, main landing gear assist bungee, oil cooler fairing and oil cooler fixed section for aircraft with Pratt & Whitney R-1830-75, -92 or -94 engines.

STC Holder: Preferred Improvements LLC Address: 11234 Hackett Rd, Apple Creek, OH 44606, United States		Contact us to have your company added here!
STC No.: SA4-230	Status: Current	App Date: 06/06/1957	Rev Date: 02/25/2016
TC Nos.: A-618, A-669,
Models: The Boeing Company: DC3-G102, DC3-G102A, DC3-G103A, DC3-G202A, DC3A-S1C3G, DC3A-S1CG, DC3A-S4C4G, DC3A-SC3G, DC3A-SCG, DC3C-R-1830-90C, DC3C-S1C3G, DC3C-S4C4G, DC3C-SC3G, DC3D-R-1830-90C
ACO: AIR-760: Central Certification Branch CHI
Installation of aileron gap closure

STC Holder: Preferred Improvements LLC Address: 11234 Hackett Rd, Apple Creek, OH 44606, United States		Contact us to have your company added here!
STC No.: ST04050CH	Status: Current	App Date: 01/16/2014	Rev Date: 02/12/2016
TC Nos.: A-669,
Models: The Boeing Company: DC3C-R-1830-90C, DC3C-S1C3G, DC3C-S4C4G, DC3C-SC3G
ACO: AIR-760: Central Certification Branch CHI
Installation of Ice Protection Systems

STC Holder: Preferred Improvements LLC Address: 11234 Hackett Rd, Apple Creek, OH 44606, United States		Contact us to have your company added here!
STC No.: ST04244CH	Status: Current	App Date: 02/01/2017	Rev Date: 01/18/2018
TC Nos.: A-669,
Models: The Boeing Company: DC3A-S1C3G, DC3A-SC3G, DC3C-R-1830-90C, DC3C-S4C4G
ACO: AIR-760: Central Certification Branch CHI
Installation and Activation of a Saab Grintek Defense Impi II Asset Tracking System

STC Holder: Preferred Improvements LLC Address: 11234 Hackett Rd, Apple Creek, OH 44606, United States		Contact us to have your company added here!
STC No.: ST04261CH	Status: Current	App Date: 06/07/2016	Rev Date: 11/20/2017
TC Nos.: A-618, A-669,
Models: The Boeing Company: DC3-G102, DC3-G102A, DC3-G103A, DC3-G202A, DC3A-S1C3G, DC3A-S1CG, DC3A-S4C4G, DC3A-SC3G, DC3A-SCG, DC3C-R-1830-90C, DC3C-S1C3G, DC3C-S4C4G, DC3C-SC3G, DC3D-R-1830-90C
ACO: AIR-760: Central Certification Branch CHI
Installation of a Gear Latch & Ground Shift system

STC Holder: Preferred Improvements LLC Address: 11234 Hackett Rd, Apple Creek, OH 44606, United States		Contact us to have your company added here!
STC No.: ST04262CH	Status: Current	App Date: 04/25/2017	Rev Date: 02/02/2018
TC Nos.: A-618, A-669,
Models: The Boeing Company: DC3-G102, DC3-G102A, DC3-G103A, DC3-G202A, DC3A-S1C3G, DC3A-S1CG, DC3A-S4C4G, DC3A-SC3G, DC3A-SCG, DC3C-R-1830-90C, DC3C-S1C3G, DC3C-S4C4G, DC3C-SC3G, DC3D-R-1830-90C
ACO: AIR-760: Central Certification Branch CHI
Install placarding to restrict total payload to a maximum of six thousand pounds (6,000 lbs)

STC Holder: Preferred Improvements LLC Address: 11234 Hackett Rd, Apple Creek, OH 44606, United States		Contact us to have your company added here!
STC No.: ST04262CH	Status: Historical	App Date: 04/25/2017	Rev Date: 12/11/2017
TC Nos.: A-618, A-669,
Models: The Boeing Company: DC3-G102, DC3-G102A, DC3-G103A, DC3-G202A, DC3A-S1C3G, DC3A-S1CG, DC3A-S4C4G, DC3A-SC3G, DC3A-SCG, DC3C-R-1830-90C, DC3C-S1C3G, DC3C-S4C4G, DC3C-SC3G, DC3D-R-1830-90C
ACO: Chicago ACO Branch, Tel: +1 (847) 294-7358
Install placarding to restrict total payload to a maximum of six thousand pounds (6,000 lbs)

STC Holder: Preferred Improvements LLC Address: 11234 Hackett Rd, Apple Creek, OH 44606, United States		Contact us to have your company added here!
STC No.: ST04263CH	Status: Current	App Date: 04/24/2017	Rev Date: 12/11/2017
TC Nos.: A-618,
Models: The Boeing Company: DC3-G102, DC3-G102A, DC3-G103A, DC3-G202A
ACO: AIR-760: Central Certification Branch CHI
Install placarding to restrict passenger count to a maximum of nineteen (19) and total payload to a maximum of seven thousand five hundred pounds (7,500 lbs)

STC Holder: Preferred Improvements LLC Address: 11234 Hackett Rd, Apple Creek, OH 44606, United States		Contact us to have your company added here!
STC No.: ST04530AT	Status: Historical	App Date: 05/07/2019	Rev Date: 12/12/2021
TC Nos.: A-669,
Models: The Boeing Company: DC3A-S1C3G, DC3C-S4C4G, DC3C-SC3G, DC3D-R-1830-90C
ACO: Chicago ACO Branch, Tel: +1 (847) 294-7358
Installation of a wingtip modification on DC3C aircraft (specific models listed)

STC Holder: Preferred Improvements LLC Address: 11234 Hackett Rd, Apple Creek, OH 44606, United States		Contact us to have your company added here!
STC No.: ST04530AT	Status: Historical	App Date: 05/07/2019	Rev Date: 12/12/2021
TC Nos.: A-669,
Models: The Boeing Company: DC3A-S1C3G, DC3C-S4C4G, DC3C-SC3G, DC3D-R-1830-90C
ACO: AIR-7C0: Chicago ACO Branch
Installation of a wingtip modification on DC3C aircraft (specific models listed)

STC Holder: Preferred Improvements LLC Address: 11234 Hackett Rd, Apple Creek, OH 44606, United States		Contact us to have your company added here!
STC No.: ST04530AT	Status: Current	App Date: 05/07/2019	Rev Date: 12/12/2021
TC Nos.: A-669,
Models: The Boeing Company: DC3A-S1C3G, DC3C-S4C4G, DC3C-SC3G, DC3D-R-1830-90C
ACO: AIR-760: Central Certification Branch CHI
Installation of a wingtip modification on DC3C aircraft (specific models listed)

STC Holder: Preferred Improvements LLC Address: 11234 Hackett Rd., Apple Creek, OH 44606		Contact us to have your company added here!
STC No.: ST04605CH	Status: Current	App Date: 03/30/2022	Rev Date: 05/22/2024
TC Nos.: A-669,
Models: The Boeing Company: DC3C-R-1830-90C, DC3C-S1C3G, DC3C-S4C4G, DC3C-SC3G
ACO: AIR-760: Central Certification Branch CHI
Installation of a Garmin GTS 8000 Traffic Alert and Collision Avoidance System (TCAS) II

STC Holder: Preferred Improvements LLC Address: 11234 Hackett Rd., Apple Creek, OH 44606		Contact us to have your company added here!
STC No.: ST04605CH	Status: Current	App Date: 03/30/2022	Rev Date: 03/21/2023
TC Nos.: A-669,
Models: The Boeing Company: DC3C-R-1830-90C, DC3C-S1C3G, DC3C-S4C4G, DC3C-SC3G
ACO: AIR-760: Central Certification Branch CHI
Installation of a Garmin GTS 8000 Traffic Alert and Collision Avoidance System (TCAS) II

STC Holder: Preferred Improvements LLC Address: 11234 Hackett Rd, Apple Creek, OH 44606, United States		Contact us to have your company added here!
STC No.: ST565CH	Status: Current	App Date: 09/09/1996	Rev Date: 03/09/2017
TC Nos.: A-669,
Models: The Boeing Company: DC3C-S1C3G, DC3C-S4C4G, DC3C-SC3G, DC3D-R-1830-90C
ACO: AIR-760: Central Certification Branch CHI
Installation of a Fairchild F800 or F1000 digital flight data recorder.