SE5058NM
Incorporation of feather seals into platforms of the first stage nozzle guide vanes, P&W P/N 653751, 737271, 738271, 747171, 792871, 786471, and 798771. Held by Chromizing Company, which holds 3 approved modifications in all. Last revised January 1, 1960. System: engine.
What it applies to
- Kind of product
- Engine
- Design holder
- Pratt & Whitney Division; Pratt & Whitney Division; Pratt & Whitney Division
- Models
- JT8D-17, JT8D-7, JT8D-9
- Type certificates
- E2EA, E2EA, E2EA
- 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 7, 2026.