ST04474AT
Installation of Landing System Sensor Units (GLSSU), dual CMA-5025 GPS Landing System (GLS) Control Panels, dual low profile high-speed WAAS GPS/SBAS/GNSSU antennas, LPV/LP Level of Service annunciator lights and ILS/DME-ILS/SLS switch lights. Held by Lb Aircraft Engineering INC, which holds 38 approved modifications in all. Last revised April 8, 2020. System: instruments and avionics.
What it applies to
- Kind of product
- Aircraft
- Design holder
- The Boeing Company; The Boeing Company; The Boeing Company
- Models
- 737-300 Series, 737-400 Series, 737-500 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.