SE02842AT
Remove drain plug, Cessna Part Number AN913-1D, from the fuel selector valve and replace with CAV-110D (CM-170) or CAV-110H-4D (CM-170L) (See page 3 for Serial Nos.). Held by Saf-Air Products INC., which holds 10 approved modifications in all. Last revised September 28, 2020. System: engine.
What it applies to
- Kind of product
- Aircraft
- Design holder
- The Cessna Aircraft Company
- Models
- 170B
- Type certificate
- A-799
- On this site
- Cessna 170 2,085 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 12, 2026.