SA965CE
Installation of Model 1U328-001 vacuum pump and 1U292-003 suction relief valve. Held by Sigma Tek, INC, which holds 3 approved modifications in all. Last revised September 17, 1990. System: engine.
What it applies to
- Kind of product
- Aircraft
- Design holder
- The Cessna Aircraft Company
- Models
- 172L
- Type certificate
- 3A12
- On this site
- Cessna 172 Skyhawk 20,676 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 20, 2026.