SH1705SO
Installation of Freon Air Conditioning System in accordance with Installation Drawing List Report No. DL-30-1, Revision B, dated November 5, 1984 and Manufacturing Drawing List, Report No. DL-30-2, Revision A, dated November 19, 1984, or later FAA approved revisions. Held by Enviro Systems INC., which holds 15 approved modifications in all. Last revised June 20, 2003. System: heating, ice protection and utility systems.
What it applies to
- Kind of product
- Aircraft
- Design holder
- Westland Helicopters Limited
- Models
- Westland 30 Series 100
- Type certificate
- H12EU
- 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 23, 2026.