need for dial altimeter?

On Sep 27, 2:57*pm, JJ Sinclair wrote:

Alas, yes they both require old fashioned dial altimiters. With todays
glass cockpits, I'm wondering if this requirement isn't outdated?
JJ

JJ - Can you, or anyone else, reference a regulation on altimeters
that includes the word DIAL.

91.205.b.2) requires for VFR flight an "altimeter"

91.205.d.5) requires for IFR flight "a sensitive altimeter adjustable
for barometric pressure".

Neither requires a dial and neither requires a mechanical instrument.

Andy

On Sep 27, 3:51*pm, Andy wrote:
On Sep 27, 2:57*pm, JJ Sinclair wrote:

Alas, yes they both require old fashioned dial altimiters. With todays
glass cockpits, I'm wondering if this requirement isn't outdated?
JJ

JJ - Can you, or anyone else, reference a regulation on altimeters
that includes the word DIAL.

91.205.b.2) *requires for VFR flight an "altimeter"

91.205.d.5) requires for IFR flight "a sensitive altimeter adjustable
for barometric pressure".

Neither requires a dial and neither requires a mechanical instrument.

Andy

I am also building a homebuilt sailplane and talked with the DAR
(designated airworthiness representative) about the instrumentation.
The answer I got was that it's pretty much up to him. I can have a
compass out of a child's toy if that's what I want and he's willing to
sign it off. Ditto for most of the other instruments.

Good point, Andy.....................maybe we can use one of the many
altitude displays available. As you may have guessed, I removed the
big dial altimeter about a year ago when I installed a transponder. I
set field elevation on the SN10 which is on the first (custom) page
and set-up to be displayed at twice normal height. When not otherwise
being used I leave the black cursor on altitude.................works
like a charm! Yes, my flight manual says I need an altimiter approved
for use on certified aircraft, but it also says I must use the Prandtl
tube, but I'm using a triple probe instead. The guy that's sign'n off
my annual condition inspections doesn't sweat the little stuff.
JJ

Andy wrote:
On Sep 27, 2:57�pm, JJ Sinclair wrote:

Alas, yes they both require old fashioned dial altimiters. With todays
glass cockpits, I'm wondering if this requirement isn't outdated?
JJ

JJ - Can you, or anyone else, reference a regulation on altimeters
that includes the word DIAL.

91.205.b.2) requires for VFR flight an "altimeter"

91.205.d.5) requires for IFR flight "a sensitive altimeter adjustable
for barometric pressure".

Neither requires a dial and neither requires a mechanical instrument.

Andy