SA1944NW-D
Retrofit of Smiths Industries Type 2123 fuel quantity indicators with Type 4211 capacitance trim units and a Type 4270 VTO relay module in the fuel quantity system in accordance with United Air Lines, DAS-1-WE, Approved Drawing List 1944 dated September 28, 1984, or later FAA approved revisions. Held by United Airlines INC, which holds 520 approved modifications in all. Last revised November 30, 2011. System: fuel system.
What it applies to
- Kind of product
- Aircraft
- Design holder
- The Boeing Company
- Models
- 737-100 Series
- Type certificate
- A16WE
- On this site
- Boeing 737 2,892 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.