ST01469CH
Installation of Cook Airtomic part number AIR 22393 auxiliary power unit supply duct flex-slide joint. Held by Cook Airtomic, which holds 5 approved modifications in all. Last revised June 1, 2001. System: engine.
What it applies to
- Kind of product
- Aircraft
- Design holder
- Fokker Services; Fokker Services
- Models
- F.28 Mark 0100, F.28 Mark 0070
- Type certificates
- A20EU, A20EU
- 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 8, 2026.