The U.S. aircraft register, updated daily
Approved modifications · supplemental type certificate · current · reissued

SA681CE

Installation: Wing leading edge fuel tanks Data required: Floair Document 141-3.21.1 dated June 23, 1972, and approved Airplane Flight Manual Supplement, Floair Document 141-3.91 dated July 24, 1972. Held by D'Shannon Products LTD., which holds 118 approved modifications in all. Last revised June 17, 2011. System: airframe structure.

What it applies to

Kind of product
Aircraft
Design holder
Hawker Beechcraft Corporation
Models
D55
Type certificate
3A16
On this site
Beechcraft D55 119 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 19, 2026.