The U.S. aircraft register, updated daily
Approved modifications · supplemental type certificate · current · issued

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Bendix S6LN-201 (L.H.) and S6LN-205 (R.H.) magnetos, Bendix10-87999-1 vibrator for engine starting, and AC SR47P spark plugs. Held by Fleetair. Last revised January 1, 1960. System: engine.

What it applies to

Kind of product
Engine
Design holder
Rolls-Royce Corporation
Models
Gipsy Queen 30 Mk.2
Type certificate
E-294
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.