SA2-498
Modification of structure, systems, and equipment to incorporate cabin pressurization, wing center section extended 26 inches, and installation of rudder hydraulic boost system. Held by Sierra Industries, INC, which holds 164 approved modifications in all. Last revised December 1, 1999. System: flight controls.
What it applies to
- Kind of product
- Aircraft
- Design holder
- Air Trading Corporation
- Models
- Navy PV-1
- Type certificate
- LTC AL-13
- 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 22, 2026.