When ALL aircraft set their altimiters to the same value worldwide, they can
maintain separation anywhere regardless of the atmospheric pressure so as to
avoid collisions.
Stan Doore
On Sep 4, 2011 7:01 AM, "Michael Payne" <[email protected]> wrote:
> I believe one atmosphere is still 100 kPa, the 1013,25 comes from the
International Standard Atmosphere.
>
> Commonly referred to as the ISA it's what manufacturers use to calibrate
instruments and what aircraft makers use to calibrate the performance of
aircraft. In the aviation world we constantly refer to the temperature being
below or above ISA, the lapse rate is fixed under ISA as 1.98 C up to 36090
(11000 m) where it's supposed to be constant. Obviously in the real world it
changes which has an affect on performance.
>
> Mike Payne
>
> On 03/09/2011, at 13:57 , G. Stanley Doore wrote:
>
>> The 1013.25 mbar (101.325 kPa) pressure for altimeter settings is NOT
"arbitrary" as Kilopascal & Wiki write. The standard altimeter setting for
worldwide altimeter settings was determined from the mean surface pressure
level.
>> Stan Doore
>>
>> On Sep 3, 2011 11:36 AM, "Michael Payne" <[email protected]> wrote:
>
