Winter Instruments 6 FMS 421
Winter 6 FMS 421 (item 6421) is a pitot airspeed indicator, 0–300 km/h, 80 mm, with a 510° spiral scale. Supplied new with an EASA Form 1; mounts in an 80 mm panel hole.
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- 6421
- Cert
- EASA
- Condition
- New
- Certified parts with full documentation
- DHL delivery to 50+ countries
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Winter 6 FMS 421, item 6421, is a pitot airspeed indicator in an 80 mm case with a 0–300 km/h range on a 510° spiral scale that spreads out the low and medium speeds. Winter developed the 6 FMS 4 series for gliders. The instrument needs 77.5 mm behind the panel and weighs 0.205 kg.
An open diaphragm cell measures the difference between total pressure and static pressure, and a linkage and gear train drives the pointer. Indication error at room temperature is ±2 km/h up to 100 km/h and ±3 km/h above. The dial has white markings on matt black, with zero at the 6 o'clock position as standard. The same instrument in mph is item 6422 and in knots item 6423. The 510° scale takes the Winter Großkinsky flap ring (item 6001).
Winter supplies the new instrument with an EASA Form 1 and installation instructions. It mounts in an 80 mm panel hole with M4 screws on a 89 mm bolt circle. A leak test is required before first use and at least every 2 years. Item 6421 is the version without colour marking; colour-marked versions take the part number from the aircraft manufacturer's documents or Winter. Fit depends on the aircraft type and the required colour marking.
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