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Landing gear and brakes

STC SA4-228

FAA DRS lists SA4-228 as Current · Reissued, held by Preferred Improvements LLC, for Boeing DC3A-S1C3G, Boeing DC3A-S1CG, and Boeing DC3A-S4C4G, and 7 more aircraft configurations. Recorded change: 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. Snapshot dated June 30, 2026.

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FAA-listed holder
Preferred Improvements LLC
Aircraft configurations
10
FAA revision date
FAA status
Current · Reissued

Recorded modification

What the FAA record covers

SA4-228 identifies the approval, recorded holder, named aircraft, and modification scope. It does not confirm kit availability, serial-number effectivity, data rights, price, or installation authority.

Applicability

Aircraft named in FAA DRS

Named aircraft: Boeing DC3A-S1C3G, Boeing DC3A-S1CG, and Boeing DC3A-S4C4G, and 7 more aircraft configurations. Confirm the approved model list, serial effectivity, configuration, and certificate revision.

Boeing DC3A-S1C3GA-669Boeing DC3A-S1CGA-669Boeing DC3A-S4C4GA-669Boeing DC3A-SC3GA-669Boeing DC3A-SCGA-669Boeing DC3C-R-1830-90CA-669Boeing DC3C-S1C3GA-669Boeing DC3C-S4C4GA-669Boeing DC3C-SC3GA-669Boeing DC3D-R-1830-90CA-669

Related landing gear and brakes STCs

FAA record reference

STC number
SA4-228
Product
Aircraft · Large Airplane
Country
United States
Application date
May 27, 1957
Revision date
February 25, 2016
CFR references
Part 21