SA2705WE
Installation of Systron-Donner Model8160-20-P1 rate sensors in Sperry SP-77 autopilot as a replacement for Sperry or Smiths rate gyros. Held by Systron-Donner CORP, which holds 2 approved modifications in all. Last revised July 15, 1974. System: flight controls.
What it applies to
- Kind of product
- Aircraft
- Design holder
- The Boeing Company; The Boeing Company; The Boeing Company
- Models
- 737-100 Series, 737-200 Series, 737-200C Series
- Type certificates
- A16WE, A16WE, A16WE
- On this site
- Boeing 737 2,893 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.