Patent ID: 7176811

Claim:
Atmospheric pressure responsive aircraft auxiliary altimeter functions electrical test apparatus comprising the combination of: a test apparatus enclosure having operator test controls, audible and visual test to operator communication transducers and external instrument metering connections received therein; an array of electrical and electronic test control circuits received in said enclosure; power input and tested altimeter communicating tethers connected with said array of electrical and electronic test control circuits; said array of electrical and electronic test control circuits including: a testing mode control bistable multivibrator electronic circuit responsive to an operator test control input signal and controlling a tested altimeter power application electrical relay; an a-stable multivibrator circuit responsive to a present state of said testing mode control bistable multivibrator electronic circuit and connected to pulsate an output signal emitted by said audible test to operator communication transducers; electronic current amplifier circuits connected to increase a signal magnitude characteristic of said testing mode control bistable multivibrator electronic circuit and energize an electrical coil portion of said tested altimeter power application electrical relay and selected of said visual test to operator communication transducers; a fixed voltage output first electronic voltage regulating circuit connected intermediate a direct current aircraft power bus compatible energy source and power input terminals of said bistable multivibrator, said a-stable multivibrator circuit and said electronic current amplifier circuits in electrical energization thereof; and an output adjustable second electronic voltage regulating circuit connected intermediate said direct current aircraft power bus energy source and a tested altimeter power conveying of said tested altimeter communicating tethers in energization of a presently selected tested altimeter function.