SA04392CH
Installation of dual Hartzell combustion heaters, P/N CD14193-1, in accordance with N18121 Installation Instructions, Revision New, dated May 28, 2019 or later FAA approved revision, into Boeing DC3A S/N 1997. Held by Aerometal International INC. Last revised May 20, 2019. System: other and general.
What it applies to
- Kind of product
- Aircraft
- Design holder
- The Boeing Company
- Models
- DC3A-S1CG
- Type certificate
- A-669
- The FAA's record
- On the FAA's site
What an approved modification is
A supplemental type certificate is the FAA's approval of a change to a certified design: a new engine or propeller, avionics, an autopilot, floats, a parachute, a larger fuel tank, an ice-protection kit. The company holding it may sell the kit and the paperwork to owners of the listed models; the modification then becomes part of that aircraft's record. The FAA's list says what was approved and for which models, not how many aircraft carry it.
Source: FAA supplemental type certificates (Dynamic Regulatory System). Register counts from the FAA register of October 20, 2026.