SA00556AT
Installation of Appalachian Accessories carbon steel brake discs, P/N AA-27A. Held by Aviation Products, INC, which holds 64 approved modifications in all. Last revised January 24, 1995. System: landing gear.
What it applies to
- Kind of product
- Aircraft
- Design holder
- Alliance Aircraft Group LLC; Alliance Aircraft Group LLC; Alliance Aircraft Group LLC; The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company; Navion Aircraft Company Ltd.; Navion Aircraft Company Ltd.; Navion Aircraft Company Ltd.; Navion Aircraft Company Ltd.; Navion Aircraft Company Ltd.; Navion Aircraft Company Ltd.
- Models
- H-295 (USAF U-10D), H-395 (USAF L-28A or U-10B), H-391 (USAF YL-24), T337E, 337, T188C, A188B, 188, 188A, 188B, A188, A188A, Navion E, Navion F, Navion D, Navion B, Navion A (L-17C), Navion A (L-17B)
- Type certificates
- 1A8, 1A8, 1A8, A6CE, A6CE, A9CE, A9CE, A9CE, A9CE, A9CE, A9CE, A9CE, A-782, A-782, A-782, A-782, A-782, A-782
- On this site
- Cessna 188 33 registered
Cessna 337 Skymaster 370 registered
Cessna A188 251 registered
Cessna T188 42 registered
Cessna T337 193 registered
Helio H-295 54 registered
Helio H-391 16 registered
Helio H-395 17 registered
Navion NAVION B 42 registered
Navion NAVION D 5 registered
Navion NAVION F 6 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.