ST222CH
Installation of ERDA seatfone kits, Part Numbers 210016-201, -203, 0-205, and -207, onto PTC Model 901 and 881 Aerolite 1 series aircraft seatbacks,. Held by Erda, INC., which holds 5 approved modifications in all. Last revised July 11, 1994. System: other and general.
What it applies to
- Kind of product
- Aircraft
- Design holder
- The Boeing Company; The Boeing Company; The Boeing Company; The Boeing Company; The Boeing Company; The Boeing Company
- Models
- DC-9-15, DC-9-31, DC-9-32, DC-9-33F, DC-9-34, DC-9-41
- Type certificates
- A6WE, A6WE, A6WE, A6WE, A6WE, A6WE
- On this site
- Douglas DC-9 7 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 21, 2026.