SA2791NM-D
Modifies the aircraft lower lobe galley lift systems by installation of dual electronic control systems. This modification installs new wiring for the alternate control system, new logic control and motor control units for both main and alternate control systems. The installation is in accordance with United Air Lines DAS 1 WE Approved Drawing List No. 2971 dated June 24, 1991 or later FAA approved revisions. Held by United Airlines INC, which holds 520 approved modifications in all. Last revised November 30, 2011. System: cabin, seats and restraints.
What it applies to
- Kind of product
- Aircraft
- Design holder
- The Boeing Company
- Models
- 747-100 Series
- Type certificate
- A20WE
- On this site
- Boeing 747 192 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.