SA2958SW
Addition of Hydro Seal Fluid Additive to landing gear shock struts. Held by Granville Lasseter/Dba Granville'S Aircraft Strut Sealant, which holds 27 approved modifications in all. Last revised August 8, 1980. System: landing gear.
What it applies to
- Kind of product
- Aircraft
- Design holder
- Beechcraft Corporation; Beechcraft Corporation; Beechcraft Corporation; Beechcraft Corporation; Beechcraft Corporation; Beechcraft Corporation
- Models
- D18C, D18S, E18S-9700, E18S, G18S, H18
- Type certificates
- A-765, A-765, A-765, A-765, A-765, A-765
- On this site
- Beechcraft D18 55 registered
Beechcraft E18 58 registered
Beechcraft G18 23 registered
Beechcraft H-18 29 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.