SA525EA-D
Convert interior passenger arrangement to the summer configuration of four first class lounge, 26 first class, and 113 tourist class seats by\nremoving the LH coat compartment, three first class double seats, and\ninstalling two additional rows of tourist class seats and a LH class divider. Held by American Airlines INC, which holds 377 approved modifications in all. Last revised April 15, 1970. System: cabin, seats and restraints.
What it applies to
- Kind of product
- Aircraft
- Design holder
- The Boeing Company
- Models
- 707-300C Series
- Type certificate
- 4A26
- On this site
- Boeing 707 9 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 23, 2026.