ST04373CH
Installation of an ACSS Automatic Dependent Surveillance-Broadcast (ADS-B) Out System in accordance with Aviation Communication & Surveillance Systems, LLC Index of Master Data List, Doc. No., 8921046, Revision -, dated March 25, 2019 or later FAA approved revision. Held by Aviation Communication and Surveillance Systems (Acss) LLC, which holds 40 approved modifications in all. Last revised March 28, 2019. System: instruments and avionics.
What it applies to
- Kind of product
- Aircraft
- Design holder
- The Boeing Company
- Models
- 737-400 Series
- Type certificate
- A16WE
- On this site
- Boeing 737 2,887 registered
- 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 7, 2026.