SA2432CE
Operation of airplane on unleaded automotive gasoline 87 minimum anti-knock index and leaded automotive gasoline, 88 minimum antiknock index (RON+MON)/2. Held by Petersen Aviation INC, which holds 167 approved modifications in all. Last revised December 7, 1988. System: other and general.
What it applies to
- Kind of product
- Aircraft
- Design holder
- The Waco Aircraft Company; The Waco Aircraft Company; The Waco Aircraft Company; The Waco Aircraft Company
- Models
- ZKS-6, YKS-6, YKC-S, YKC
- Type certificates
- A-533, A-533, A-533, A-533
- On this site
- Waco YKC 10 registered
Waco YKS-6 15 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.