SA3350WE-D
The air data system is revised in accordance with United Air Lines,\nDAS-1-WE Approved Drawing List No. 3350 dated July 20, 1979, or later FAA approved revisions to the following configuration:\n1.\tThe Captain's and First Officer's altimeters are Harowe P/N 2050 Series electric indicators.\n2.\tThe No. 1 air data computer is a Honeywell P/N HG180U-742 (727-222 only) or a United Air Lines P/N 9F-9058-505 (727-22, -22C only).\n3.\tThe No. 2 air data computer is a Harowe P/N 4019-1, -2, or -5. On the 727-222 only, a Honeywell\n HG180OU-742, HG180V2-9F9058-506, HG180V1-9F9057-504. 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; The Boeing Company; The Boeing Company
- Models
- 727-200 Series, 727 Series, 727C Series
- Type certificates
- 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.