SH5999SW
Installation of Marathon battery TSP or TCA 1753 or TSP or TCA 1754. Held by Marathon Power Tech CO, which holds 11 approved modifications in all. Last revised May 19, 1994. System: electrical power.
What it applies to
- Kind of product
- Aircraft
- Design holder
- MD Helicopter Inc.
- Models
- 369HS
- Type certificate
- H3WE
- On this site
- Md Helicopters Inc 369 108 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.