SA4-525
Installation of VIP P/N 106-1J engine mount core. Held by Vibration Isolation Products CORP, which holds 3 approved modifications in all. Last revised September 16, 1986. System: engine.
What it applies to
- Kind of product
- Aircraft
- Design holder
- Curtiss-Wright Corporation; Lockheed Aircraft Corporation; Martin-Marietta Corporation; Martin-Marietta Corporation; McDonnell Douglas Corporation; McDonnell Douglas Corporation; McDonnell Douglas Corporation; McDonnell Douglas Corporation; Tracor Flight Systems Inc.; Tracor Flight Systems Inc.; Tracor Flight Systems Inc.
- Models
- C-46/CW20-T, Navy PV-2, 404, 202, DC-6A (Navy R6D-1), DC-6A (USAF C-118A), DC-6B (Navy R6D-1Z), DC-6, 340, 440 Military C-131E, 240 Series
- Type certificates
- 2A5, LTC-13, 1A7, A-795, 6A3, 6A3, 6A4, A-781, 6A6, 6A6, A-793
- On this site
- Curtiss Wright C-46 8 registered
Douglas DC-6 17 registered
Martin 404 5 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.