On 2017-04-04, Martin Gregorie  wrote:

> On Tue, 04 Apr 2017 05:30:10 +0000, Charlie Gibbs wrote:
>
>> Interesting thought: on powered planes over there with constant-speed
>> props, are the manifold pressure gauges marked in inches of mercury?
>> They are here - as well as the appropriate places in the POH.
>
> Good point. I'd guess bar in more recent types because metrication and
> because aircraft tyre pressures are often in bar, but I've never
> knowingly sat in the cockpit of anything with constant speed props.
>
> The most complex cockpit I've ridden in was on one of those six seat
> Piper PA-32 Navaho variants. There were seven of us needing to ride and I
> got offered the right-hand seat. Fun. It had an auto-pilot but I don't
> remember anything about the engine management. Would it be usual to find
> constant speed props on a PA-31?

It would be quite unusual not to.  They're on pretty much every engine
generating 200 hp or more (oh look, another Imperial unit!) and on some
smaller ones.  Once upon a time I flew aerobatics in a 150-hp Decathlon
that had a constant-speed prop.  It also had no throttle friction, and
unless you were holding it it would slowly edge back; the prop would
keep the RPM steady so you wouldn't hear anything different.  One time
I fell out of the top of a loop and upon recovering noticed that the
throttle had crept back to 15 inches, which wasn't enough power to
perform the maneuver.

>>> I know there are other things I'd expect to differ too, e.g. almost all
>>> non-US airliners will be doing Mode S with 1090ES extended squitters
>>> and I wouldn't expect any of them to have UAT systems fitted.
>>
>> As of 2020, ADS-B (either Mode S with 1090ES or UAT) will be mandatory
>> for all aircraft operating in U.S. airspace classes A, B, and C, plus
>> class E above 10,000 feet.
>>
> It seems likely that gliders will get some sort of exemption, along with
> older powered aircraft that don't have electrical systems. There's a lot
> of talk on r.a.s about what will count as the TABS-qualified position
> source. Current the best bet looks like being a Trig TT-21 or TT-22
> transponder with the new TN-72 position source.

Interestingly, there's a note going out over here recommending that
transponder-equipped gliders squawk 1202 so that ATC can easily
distinguish them from other uncontrolled VFR traffic.

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