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

SR04842NY

Installation of RMCI Inc. Expandable Rotorcraft Diagnostic System (XRDS). Held by Sterling Helicopter, which holds 8 approved modifications in all. Last revised March 11, 2025. System: other and general.

What it applies to

Kind of product
Aircraft
Design holder
Airbus Helicopters Deutschland GmbH (AHD); Airbus Helicopters Deutschland GmbH (AHD); Airbus Helicopters Deutschland GmbH (AHD); Airbus Helicopters Deutschland GmbH (AHD); Airbus Helicopters Deutschland GmbH (AHD); Airbus Helicopters Deutschland GmbH (AHD); Airbus Helicopters Deutschland GmbH (AHD); Airbus Helicopters Deutschland GmbH (AHD); Bell Textron Canada Limited; Bell Textron Canada Limited; Bell Textron Canada Limited; Bell Textron Canada Limited; Bell Textron Canada Limited; Bell Textron Canada Limited; Bell Textron Canada Limited; Bell Textron Canada Limited; Bell Textron Canada Limited; Bell Textron Canada Limited; Airbus Helicopters Deutschland GmbH (AHD); Bell Textron Canada Limited; Leonardo S.p.A.; Leonardo S.p.A.; Leonardo S.p.A.; Leonardo S.p.A.; Leonardo S.p.A.; Leonardo S.p.A.; Leonardo S.p.A.; Leonardo S.p.A.; Leonardo S.p.A.
Models
EC135P1, EC135P2, EC135P2+, EC135P3, EC135T1, EC135T2, EC135T2+, EC135T3, 206, 206A, 206A-1 (OH-58A), 206B, 206B-1, 206L, 206L-1, 206L-3, 206L-4, 407, EC635T2+, 505, A109, A109A, A109A II, A109C, A109K2, A109E, A109S, AW109SP, AW119 MKII
Type certificates
H88EU, H88EU, H88EU, H88EU, H88EU, H88EU, H88EU, H88EU, H2SW, H2SW, H2SW, H2SW, H2SW, H2SW, H2SW, H2SW, H2SW, H2SW, H88EU, R00008RD, H7EU, H7EU, H7EU, H7EU, H7EU, H7EU, H7EU, H7EU, H7EU
On this site
Agusta Spa A109 108 registered
Airbus Helicopters EC-135 now H135 397 registered
Bell 206 JetRanger and LongRanger 1,455 registered
Bell 407 984 registered
Bell 505 192 registered
Leonardo Spa AW109 19 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.