SA3928SW-D
Installation of a single or Litton LTN-311 Omega /VLF navigation system (ONS), including software program 311-04-03A, in aircraft with analog flight instruments (Non-EFIS aircraft). Held by American Airlines INC, which holds 377 approved modifications in all. Last revised April 19, 1993. System: instruments and avionics.
What it applies to
- Kind of product
- Aircraft
- Design holder
- The Boeing Company; The Boeing Company
- Models
- DC-9-82 (MD-82), DC-9-83 (MD-83)
- Type certificates
- A6WE, A6WE
- On this site
- Mcdonnell Douglas DC-9 93 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.