June 2011 Issue
Going Vacuumless: Say G’bye to the Pump
Aircraft originally certifi ed with vacuum systems are now legally fl ying as all-electric aircraft. A little research will show if you can, too.
From the moment light singles started shipping with no pneumatic (vacuum or pressure) instruments, itís been the dream of many an owner to yank out the maintenance-hungry vacuum pumps and replace the pneumatic instruments with electric ones. Doing away with pneumatics makes even more sense after a glass panel upgrade where the only item left is usually a vacuum-driven attitude indicator doing duty as a backup. A dry-vane vacuum pump with over 500 hours in service is of questionable reliability. Many pneumatic instruments last over 1000 hours, but thatís the exception rather than the rule. There are also the filters to check and replace.
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