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

SA1282WE

Dual Collins AL101 radio altimeter system, dual Collins No. 51RV-1 navigation receivers and all weather landing system wiring and installation provisions. Held by Lost Birds Aviation Historical Society & Museum, which holds 2 approved modifications in all. Last revised July 2, 2002. System: instruments and avionics.

What it applies to

Kind of product
Aircraft
Design holder
Tracor Flight Systems Inc.
Models
22M
Type certificate
4A27
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.