SA2861SW
Addition of Hydro seal fluid additive to nose and main 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
- Learjet Inc.; Learjet Inc.; Learjet Inc.; Learjet Inc.; Learjet Inc.
- Models
- 23, 24, 25, 35, 36
- Type certificates
- A5CE, A10CE, A10CE, A10CE, A10CE
- On this site
- Learjet 23 6 registered
Learjet 24 16 registered
Learjet 25 23 registered
Learjet 35 161 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 19, 2026.