SA555EA-D
To comply with FAR 25.812(e), a lever lock switch will be installed at a point accessible to the forward flight attendant seat and the necessary circuitry will be installed to allow the flight attendant to turn the emergency lights "on". Held by American Airlines INC, which holds 377 approved modifications in all. Last revised January 26, 1970. System: cabin, seats and restraints.
What it applies to
- Kind of product
- Aircraft
- Design holder
- Airbus; The Boeing Company; The Boeing Company; The Boeing Company; The Boeing Company; The Boeing Company
- Models
- BAC 1-11 400 Series, 707-100 Long Body, 707-100B Long Body, 707-100B Short Body, 707-300C Series, 720B Series
- Type certificates
- A5EU, 4A21, 4A21, 4A21, 4A26, 4A28
- 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 20, 2026.