ST505SO
Manufacture of Nordskog storage units in accordance with Nordskog drawings 1-209, Rev. B and 1-210, Rev. B and their installation in accordance with NAL E.O. P-2350-01 and P-2350-00-06, Rev. B respectively. (747-100 SERIES -135). Held by National Airlines, INC, which holds 4 approved modifications in all. Last revised May 23, 1972. System: other and general.
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.