ST00646NY
Installation of Altimeter P/N 9D-80110-2 with Software P/N 7H-80109-7 on pilot's side only and Altitude Alerter P/N 9D-80310-2. Held by Innovative Solutions & Support, INC., which holds 6 approved modifications in all. Last revised February 5, 1999. System: instruments and avionics.
What it applies to
- Kind of product
- Aircraft
- Design holder
- McDonnell Douglas Corporation; McDonnell Douglas Corporation; McDonnell Douglas Corporation; McDonnell Douglas Corporation
- Models
- DC-9-41, DC-9-32, DC-9-31, DC-9-51
- Type certificates
- A6WE, A6WE, A6WE, A6WE
- On this site
- Mcdonnell Douglas DC-9 93 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.