SA4091NM
Intallation of Honeywell vertical speed indicator/traffic resolution advisory (VSI/TRA) displays. (DHC-8 -102, -103) STC SA4593NM-D is required. Held by Learjet INC, which holds 538 approved modifications in all. Last revised March 7, 2002. System: instruments and avionics.
What it applies to
- Kind of product
- Aircraft
- Design holder
- Bombardier-Rotax GmbH
- Models
- DHC-8
- Type certificate
- A13NM
- On this site
- Bombardier DHC-8 Dash 8 and Q400 58 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 21, 2026.