SA5518SW
Replacement of existing engine indicators (ITT, percent fan RPM, percent turbine RPM, fuel flow, fuel quantity, oil pressure) with Howell Instruments indicators. Held by Air Carrier Electronics. Last revised February 25, 1987. System: engine.
What it applies to
- Kind of product
- Aircraft
- Design holder
- Textron Aviation Inc.; Textron Aviation Inc.
- Models
- 501, 551
- Type certificates
- A27CE, A27CE
- 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.