A pilot can only be an approved observer for take-off and landing of her/his own flight unless they are a BOM and/or CASA approved observer !
AIP GEN 3.5 4.5.2
Only for establishing
visibility for Take-Off and Landing.
CIVIL AVIATION REGULATIONS 1988 - REG 120
Weather reports not to be used if not made with authority
(1) The operator or pilot in command of an aircraft must not use weather reports of actual or forecasted meteorological conditions in the planning, conduct and control of a flight if the meteorological observations, forecasts or reports were not made with the authority of:
(a) the Director of Meteorology; or
(b) a person approved for the purpose by CASA.
Penalty: 5 penalty units.
(2) An offence against subregulation (1) is an offence of strict liability.
Note For strict liability , see section 6.1 of the Criminal Code .
However section AIP GEN 3.5 4.7.2 might allow the person on the ground to report the wind data to a remotely located approved MET observer who then could relay the info to the aircraft in flight.
