SA4-21
Fuel system modified to provide dual wobble pumps and suction crossfeed and attendant plumbing. Held by Staggerwing Museum Foundation INC., which holds 123 approved modifications in all. Last revised October 6, 2006. System: fuel system.
What it applies to
- Kind of product
- Aircraft
- Design holder
- Hawker Beechcraft Corporation; Hawker Beechcraft Corporation
- Models
- Army AT-11, C18S
- Type certificates
- A-2-582, A-757
- On this site
- Beechcraft C18 13 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 7, 2026.