SA2691CE
This modification consists of the following: 1. Hydraulic pump replacement 2. relocated battery 3. change generator to alternator 4. add oil tank heater 5. recover control surface 6. decorative plating-landing gear 7. Modified front and rear Inst. panel 8. added carburetor & cylinder gages 9. added hourmeter 10. added strobe lights 11. changed engine air filter bracket. Held by Suburban Air INC. Last revised February 7, 1991. System: engine.
What it applies to
- Kind of product
- Aircraft
- Design holder
- The Boeing Company
- Models
- AT-6D (SNJ-5)
- Type certificate
- A-2-575
- 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 20, 2026.