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

SA02096AK

Installation of hourmeter airspeed switch. (PA-23-250 Navy UO-1). Held by Avalaska INC, which holds 8 approved modifications in all. Last revised December 17, 1997. System: instruments and avionics.

What it applies to

Kind of product
Aircraft
Design holder
The New Piper Aircraft Inc.; The New Piper Aircraft Inc.; The New Piper Aircraft Inc.; The New Piper Aircraft Inc.; The New Piper Aircraft Inc.; The New Piper Aircraft Inc.; The New Piper Aircraft Inc.; The New Piper Aircraft Inc.; The New Piper Aircraft Inc.; The New Piper Aircraft Inc.; The New Piper Aircraft Inc.; The New Piper Aircraft Inc.; The New Piper Aircraft Inc.; The New Piper Aircraft Inc.; The New Piper Aircraft Inc.; The New Piper Aircraft Inc.; The New Piper Aircraft Inc.; The New Piper Aircraft Inc.; The New Piper Aircraft Inc.; The New Piper Aircraft Inc.; The New Piper Aircraft Inc.; The New Piper Aircraft Inc.
Models
PA-23-160, PA-E23-250, PA-23-250, PA-23-235, PA-23, PA-44-180T, PA-44-180, PA-40, PA-39, PA-30, PA-31-300, PA-31-325, PA-31, PA-31-350, PA-34-200, PA-34-200T, PA-34-220T (III), PA-34-220T (IV), PA-31T3, PA-31T, PA-31T2, PA-31T1
Type certificates
1A10, 1A10, 1A10, 1A10, 1A10, A19SO, A19SO, A1EA, A1EA, A1EA, A20SO, A20SO, A20SO, A20SO, A7SO, A7SO, A7SO, A7SO, A8EA, A8EA, A8EA, A8EA
On this site
Piper PA-23 Apache and Aztec 1,316 registered
Piper PA-30 Twin Comanche 879 registered
Piper PA-31 Navajo and Chieftain 935 registered
Piper PA-34 Seneca 998 registered
Piper PA-39 Twin Comanche C/R 82 registered
Piper PA-44 Seminole 599 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.