Winter Instruments 7 FMS 441
Winter 7 FMS 441 (item 7441) is a 57 mm pitot airspeed indicator, 0–350 km/h, with a 510° spiral scale, for gliders, motor gliders and microlights. Supplied new with an EASA Form 1.
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- 7441
- Cert
- EASA
- Condition
- New
- Certified parts with full documentation
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Winter 7 FMS 441, item 7441, is a pitot airspeed indicator for gliders, motor gliders and microlights with a 0–350 km/h range in a 57 mm case. The 510° spiral scale has non-linear graduation that spreads out the low and medium speeds.
An open diaphragm capsule measures the difference between pitot (total) pressure and static pressure; a lever and gear mechanism drives the pointer. Zero is at the bottom as standard. Winter states an indication error of ±2 km/h up to 100 km/h and ±3 km/h above at room temperature, and a maximum operating altitude of 12,000 m. The 360° linear-scale version is the 7 FMS 521 (7521).
The indicator fits a 57 mm panel hole with a 67 mm hole circle for M4 screws and needs 57 mm depth behind the panel. A leak test is required before first use; Winter specifies a leak test at least every 2 years and recommends retesting after 5 years. Winter supplies the new 7 FMS 441 with an EASA Form 1 and the installation and maintenance instructions. Item 7441 is the dial without colour markings; for a marked dial the part number comes from the aircraft manufacturer’s documentation or from Winter. Fit depends on the aircraft type and any required colour markings.
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