SA2777NM-D
Installation dual Mode-S/ATCRBS transponders and full Traffic Alert Collision Avoidance System (TCAS) provisions in accordance with United Ai Lines DAS-1-WE Approved Master Drawing List No. 2777 dated July 18, 1990, or later FAA approved revisions. United Air Lines Airplane Flight Manual Supplement to FAA Approved Flight Manual D6-8737-222 dated July 18, 1990, or later FAA approved revision is required as part of this installation. Held by United Airlines INC, which holds 520 approved modifications in all. Last revised November 30, 2011. System: instruments and avionics.
What it applies to
- Kind of product
- Aircraft
- Design holder
- The Boeing Company
- Models
- 737-200 Series
- Type certificate
- 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.