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

SR00491AT-D

Installation and operation of a Tyler Camera mount systems nose camera mount. Held by Tyler Camera Systems, which holds 21 approved modifications in all. Last revised April 3, 1995. System: other and general.

What it applies to

Kind of product
Aircraft
Design holder
Eurocopter France; Eurocopter France
Models
AS355 Series, AS-350 Series
Type certificates
H11EU, H9EU
On this site
Airbus Helicopters AS350 AStar (Écureuil), now H125 891 registered
Airbus Helicopters AS355 TwinStar 6 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.