ST01691CH
Installation of a Smiths Industries combined voice and flight data recorder, model 3257A1, and optional Smiths Industries recorder control unit, model 3874C1. Held by Ge Aviation Systems LLC, which holds 2 approved modifications in all. Last revised March 17, 2008. 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
- 727-100 Series, 727-100C Series, 727-200 Series, 727-200F Series, 727 Series, 727C Series
- Type certificates
- A3WE, A3WE, A3WE, A3WE, A3WE, A3WE
- On this site
- Boeing 727 37 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 20, 2026.