SH4027NM
Install a MS24658-21A, three position locking switch to replace the non-locked hydraulic servo switch. Held by Aero Credit Company, INC, which holds 5 approved modifications in all. Last revised May 9, 1988. System: flight controls.
What it applies to
- Kind of product
- Aircraft
- Design holder
- Agusta S.p.A.; Agusta S.p.A.
- Models
- A109AII, A109A
- Type certificates
- H7EU, H7EU
- On this site
- Agusta Spa A109 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 20, 2026.