ST01706LA
B757-200PF Series, Serial No: 23723-23732, 23851, 23852, 25472-25474, 25482-27386, 27390, 27735-27737, 27739, 28267-28269, 28844 and 28845 only: Installation of the Atmospheric Water Vapor Sensing System (WVSS-II). Held by Spectrasensors INC, which holds 2 approved modifications in all. Last revised August 26, 2009. System: other and general.
What it applies to
- Kind of product
- Aircraft
- Design holder
- The Boeing Company
- Models
- 757-200PF Series
- Type certificate
- A2NM
- On this site
- Boeing 757 440 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.