Here's the relevant part of CS22 regarding airspeed indicators:
CS 22.1323 Air-speed indicating system
(a) The air-speed indicating system must be
calibrated to indicate true air-speed at sea-level
in standard atmosphere with a maximum pitot-
static error not exceeding ± 8 km/h or ± 5%
whichever is greater, throughout the following
speed range 1·2 VS to VNE, and with wing-flaps
neutral and air brakes closed.
(b) Calibration must be made in flight.
(c) The air-speed indicating system must be
suitable for speeds between VS0 and at least 1·05 times VNE
So a glider like that ASH31Mi with a Vne of
152KIAS needs an ASI capable of reading to at
least 159.6 KIAS so the standard Winter ASI which
reads to 160 knots would be adequate.
So what is the overwhelming reason for Australia to do something different?
Mike
Borgelt Instruments - design & manufacture of
quality soaring instrumentation since 1978
www.borgeltinstruments.com
tel: 07 4635 5784 overseas: int+61-7-4635 5784
mob: 042835 5784 : int+61-42835 5784
P O Box 4607, Toowoomba East, QLD 4350, Australia
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