ST00566LA-D

The modification will remove one row (six seat places) of B/E Aerospace TSO C-39b seats in the forward area of economy class on our B737-200 series aircraft. When removed, the forward five rows of economy seats aft of the class divider will be relocated, increasing the seat pitch from 31 to 35 inches. The final seat configuration count will be 8F/95Y. The installation is in accordance with DAS-1-WE Approved United Air Lines Master Document List No. 00566 dated January 30, 2000, 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: 737-200 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.