The U.S. aircraft register, updated daily
Approved modifications · supplemental type certificate · current · issued

SA301NE

Installation of seats and furnishings to accommodate 30 passengers and one flight attendant. Held by Georgetown Aircraft Serv, which holds 48 approved modifications in all. Last revised November 8, 1998. System: cabin, seats and restraints.

What it applies to

Kind of product
Aircraft
Design holder
Grumman American Aviation Corporation
Models
Grumman G-111 (Albatross)
Type certificate
A22SO
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 21, 2026.