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Other aircraft modifications

STC ST04050CH

FAA DRS lists ST04050CH as Current · Reissued, held by Preferred Improvements LLC, for Boeing DC3C-R-1830-90C, Boeing DC3C-S1C3G, and Boeing DC3C-S4C4G, and 1 more aircraft configuration. Recorded change: Installation of Ice Protection Systems. Snapshot dated June 30, 2026.

FAA-listed holder
Preferred Improvements LLC
Aircraft configurations
4
FAA revision date
FAA status
Current · Reissued

Recorded modification

What the FAA record covers

Installation of Ice Protection Systems.

ST04050CH 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 DC3C-R-1830-90C, Boeing DC3C-S1C3G, and Boeing DC3C-S4C4G, and 1 more aircraft configuration. Confirm the approved model list, serial effectivity, configuration, and certificate revision.

Boeing DC3C-R-1830-90CA-669Boeing DC3C-S1C3GA-669Boeing DC3C-S4C4GA-669Boeing DC3C-SC3GA-669

Buyer checks

Confirm before sourcing

  1. 01Does it cover the exact Boeing DC3C-R-1830-90C and Boeing DC3C-S1C3G, and 2 more aircraft configurations model, serial range, and configuration?
  2. 02Which configuration, parts, installation data, limitations, and ICAs 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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