ST00504LA
Modification of Litton LTN-92 and LTN-72 Inertial Navigation Systems (INS) to implement the Area Navigation (RNAV) updating capability. Held by Northrop Grumman Systems Corporation, which holds 62 approved modifications in all. Last revised February 22, 2016. System: instruments and avionics.
What it applies to
- Kind of product
- Aircraft
- Design holder
- The Boeing Company; The Boeing Company; The Boeing Company; The Boeing Company
- Models
- 747-100 Series, 747-200B Series, 747-200C Series, 747-200F Series
- Type certificates
- A20WE, A20WE, A20WE, 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 7, 2026.