ST00583WI
Increase gross takeoff weight for Model 31 to the same as 31A and increase zero fuel weight from 13000 to 13500 for both Learjet Model 31 and Model 31A. Held by Learjet INC, which holds 538 approved modifications in all. Last revised October 8, 1997. System: other and general.
What it applies to
- Kind of product
- Aircraft
- Design holder
- Learjet Inc.; Learjet Inc.
- Models
- Learjet 31A, Learjet 31
- Type certificates
- A10CE, A10CE
- 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.