Jump to content

Loss of airspeed indicator on dual GI 275 install on a night takeoff in a Mooney Ovation


Fly_M20R

Recommended Posts

I am also having a GI275 installed as my AI (similar vintage Ovation as OP) to remove the vacuum systems. I've been using this relatively inexpensive Dynon as a backup, even though I've had a standby vac system. I like it because it has a long lasting battery, it is portable, snaps right in and has airspeed (obviously GPS based - but a good backup reference point), and synthetic vision.  The quality is quite good from my experience and for the price, the additional redundancy is a nice to have. 

image.thumb.png.c61f81516b8fa4f9f39f38edcbe170a3.png

 

Link to comment
Share on other sites

  • 3 weeks later...

Its a little disingenuous to title this event 'loss of airspeed indicator ...on GI 275'.   That is not what happened and this title will get web search hits.

The OP proceeded to take off without an indication of proper flying airspeed - what he should have done was abort.  On a twin you wouldn't leave the ground until above Vmc because you would likely lose your life if an engine failed.

Strike 1 - forgot the pitot cover

Strike 2 - take off without proper airspeed indication

Strike 3 ????

 

The 23 kts in not an erroneous reading.  It is the threshold Garmin decided was a useable value from the sensor.  Air Data Computers on 'big iron' often don't indicate until above 25 or 30 kts (on the digital data bus the signal status is marked NCD - no computed data).

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

×
×
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.