ST11051SC

Upgrade of pilot and co-pilot electromechanical flight instruments (ADI and HSI) to Rogerson Kratos EFIS 520, electronic flight instrument system (EFIS) in accordance with Compliance Data List DL1769M00, Revision IR, dated December 20, 2011 or later FAA approved revision. Airplane Flight Manual Supplement 9967-0062, Revision IR, dated December 20, 2011 or later FAA approved revision, and Instructions for Continued Airworthiness 1769R33C02, Revision A, dated August 1, 2011 or later FAA accepted revision must be made available to the operator at the time of installation. Held by Vt Drb Aviation Consultants, which holds 22 approved modifications in all. Last revised March 19, 2018. System: instruments and avionics.

What it applies to

Kind of product: Aircraft
Design holder: Gulfstream Aerospace Corporation
Models: G-1159
Type certificate: A12EA
On this site: Gulfstream G-1159 Gulfstream II and III 42 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 21, 2026.