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Showing results for tags 'altimeter backup'.
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For many years I kept a second barometric altimeter in the panel of my "E" model just as backup. I'd scan both dials during approaches to make sure they agreed: 50 year old mechanical instruments have been known to fail. More recently I changed my practice to glance at the GPS altitude on the panel mounted WAAS box, and/or the iPad. GPS altitude is not a substitute for baro altitude, but it does give a pretty good cross-check of the mechanical instrument or the static system. Now you can use your iPhone6 (which has a pressure sensor) and some Android devices as a baro altimeter backup. Here's one example https://itunes.apple.com/us/app/barometer-for-iphone-6-6-plus/id922859877?mt=8 of an app that works as a backup altimeter (in an unpressurized cabin), can be calibrated and can be adjusted for local altimeter setting.
