SR04422CH
Installation of NASI NTEC36TM Cooling System in accordance with Master Data List (MDL) as listed on AML No. SR04422CH, or later FAA approved revision. Held by National Aircraft Service INC, which holds 16 approved modifications in all. Last revised August 27, 2019. System: other and general.
What it applies to
- Kind of product
- Aircraft
- Design holder
- Sikorsky Aircraft Corporation; Sikorsky Aircraft Corporation; Sikorsky Aircraft Corporation; Sikorsky Aircraft Corporation; Sikorsky Aircraft Corporation
- Models
- S-70, S-70C, S-70C(M), S-70C(M1), S-70A
- Type certificates
- H2NE, H3NE, H4NE, H4NE, H5NE
- On this site
- Sikorsky S-70 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 7, 2026.