SH169WE
Installation of exhaust muffler assembly. Held by Lear Avia Corporation, which holds 13 approved modifications in all. Last revised January 31, 1975. System: engine.
What it applies to
- Kind of product
- Aircraft
- Design holder
- Bell Helicopter Textron; Bell Helicopter Textron; Bell Helicopter Textron; Bell Helicopter Textron; Bell Helicopter Textron; Bell Helicopter Textron; Bell Helicopter Textron
- Models
- 47B3, 47B, 47G-2 (USAF H-13H), 47E (Navy HTL-3), 47G Series, 47D1 Series, 47H-1
- Type certificates
- H-1, H-1, H-1, H-1, H-1, H-1, H-1
- On this site
- Bell 47 478 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.