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In my opinion the Best is to use this pressure switch only to
alarm. Final decision should be up to pilot discretion.
Sílvio Novelli
Lancair 320 - PP-XSN
+55 (14) 3841-2337
From: Lancair Mailing List
[mailto:lml@lancaironline.net] On Behalf Of Tom Gourley
Sent: sexta-feira, 29 de janeiro de 2010 13:32
To: lml@lancaironline.net
Subject: [LML] Re: Airspeed sensing switch needed
"I have my airspeed sensing switch set
a 90 knots, in the gear-up circuit, so that no matter where the gear switch is,
it can't raise the gear unless the airspeed is greater than 90 knots.
Same
on landing. I fi forget to put the gear switch to down, the gear will
come down anyway at 90 knots."
As
I recall Piper used to have an automatic gear extension system on the
Arrow. After some accidents caused by the gear coming down before the
pilot expected or wanted it to, and sometimes failing to retract because best
angle climb speed could be below the gear extension
speed, Piper published a service bulletin recommending disabling
the automatic gear extension system. Sounds to me like the system was too
simple, using one set airspeed below which the gear would extend if it was up,
or stay down after takeoff even though the gear switch was in the retracted
position. There was an override switch but too often the pilot
forgot about it, especially in a tense situation.
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