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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.

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

Recorded modification

What the FAA record covers

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.

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

Buyer checks

Confirm before sourcing

  1. 01Does it cover the exact Boeing DC3A-S1C3G and Boeing DC3A-S1CG, and 8 more aircraft configurations model, serial range, and configuration?
  2. 02Which gear, wheel, brake, tire, and hydraulic configurations apply?
  3. 03Who can legally supply the design data, kit, instructions, and ICAs?
  4. 04What parts, labor, conformity, and return-to-service work are excluded?

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