SH2186SO
Replace existing nickel cadium battery with Teledyne Gill G-6381 series lead acid battery. Held by Teledyne Battery Products, which holds 56 approved modifications in all. Last revised April 29, 1996. System: electrical power.
What it applies to
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 5, 2026.