Fitment of 'TAMAM' Standby Attitude Indicators to Macchi Aircraft.

Abstract : The Aircraft Research and Development Unit reworked Macchi MB 326H Draft Modification Order No 365 to install the 'TAMAM' Standby Attitude Indicator (SAI) in the front and rear instrument panels of Macchi aircraft. Modifications were also developed to provide independent switching and circuit protection for each SAI on the existing FIRE/OVERHEAT panel in the Right hand console of the front cockpit. RPM indicator lighting control was transferred from its individual rheostat to the panel lighting control and protection circuit. The modification was successfully test flown with particular emphasis on instrument readability, lack of conflict with the flight controls and ease of operation. Residual errors noted in the SAIs after manoeuvres were large but were immediately cancelled by operation of the caging knob. Trial flying of the installation showed the modification to be operationally acceptable and fleet wide installation was recommended.