ST01820CH
Installation of Aviation Communication and Surveillance System TCAS provisions. Held by Aviation Communication and Surveillance Systems (Acss) LLC, which holds 40 approved modifications in all. Last revised February 1, 2007. System: instruments and avionics.
What it applies to
- Kind of product
- Aircraft
- Design holder
- McDonnell Douglas Corporation; McDonnell Douglas Corporation; McDonnell Douglas Corporation; McDonnell Douglas Corporation; McDonnell Douglas Corporation
- Models
- DC-9-81, DC-9-82, DC-9-83, DC-9-87, MD-88
- Type certificates
- A6WE, A6WE, A6WE, A6WE, A6WE
- On this site
- Douglas DC-9 7 registered
Mcdonnell Douglas Aircraft Co MD-88 10 registered
Mcdonnell Douglas DC-9 93 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.