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MIL-PRF-83419 Altimeter, Servo Controlled, Automatic Pressure StandbyThis specification covers integrally-lighted altimeters that have an electromechanically servo driven pointer and a digital display of corrected altitude. The altimeters operate in the normal mode to display altitude transmitted by altitude computers or central air data computers. The altimeters incorporate an integral pressure sensor with electronic outputs to aid operation in the normal mode and to provide altitude inputs for the electronic display of pressure altitude when operated in the standby mode. The altimeters also incorporate an electrical output of barometric pressure setting which is required by some aircraft. A method is provided on the bezel of the altimeter for the selection of barometric setting to be displayed in either inches of mercury \(in. hg\) or millibars \(mb\). The altimeters are designed to operate from the following power sources: 115V, 400Hz \(primary\), 28V DC \(secondary\), and 18V DC \(battery mode\) from an optional rear mounted battery module. Altimeters meeting the requirements of this specification are interchangeable with AAU-19/A, AAU-19A/A, and AAU-19B/A, AAU-34/A, and AAU-37/A Altimeters.

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MIL-PRF-83419E
3.4.2 Toxic and corrosive fumes. Materials, as installed in the altimeter and under the
service conditions specified herein, shall not liberate deleterious or corrosive fumes. This shall
include any fungicidal agents that are used.
3.4.3 Protective treatment. When materials which are used in the construction of the
altimeter are subject to deterioration when exposed to climatic and environmental conditions
likely to occur during service usage, they shall be protected against such deterioration in a
manner that will in no way prevent compliance with the performance requirements of the
specification. The use of any protective coating that will crack, chip, or scale with age or
extremes of climatic or environmental conditions shall be avoided.
3.4.4 Fungus-proof materials. Materials that are nutrients for fungi shall not be used
where it is practical to avoid them. Where used and not hermetically sealed, they shall be treated
with a fungicidal agent acceptable to the procuring activity. However, if they are used in a
hermetically sealed enclosure, fungicidal treatment will not be necessary.
3.4.5 Metals. Metals shall be of the corrosion-resistant type, unless suitably protected to
resist corrosion during normal service life.
3.4.5.1 Dissimilar metals. Dissimilar metals are defined in MIL-STD-889. Unless
suitably protected against electrolytic corrosion by means of protective coating or hermetic
sealing, intimate contact of dissimilar metals shall be avoided.
3.4.6 Nonferrous metals. Nonferrous materials shall be used for all parts of the
altimeter, except where ferrous materials are essential.
3.4.6.1 Protection of nonferrous materials. Nonferrous materials contained within
hermetically sealed enclosures shall be considered suitably protected from corrosion.
Requirements specified for fungicidal and corrosion protective treatment and anodizing of
aluminum alloy parts will not be applicable for parts within hermetically sealed enclosures.
3.4.7 Recycled, recovered, or environmentally preferable materials. Recycled,
recovered, or environmentally preferable materials should be used to the maximum extent
possible, provided that the material meets or exceeds the operational and maintenance
requirements, and promotes economically advantageous life cycle costs.
3.4.8 Cementing Materials. Cases, components, or parts shall not be entirely dependent
upon cements, epoxies or related materials to maintain integrity for the service life of the
altimeter.
3.5 Design and Construction.
3.5.1 Case. The case shall consist of a body with a flange and a bezel, referencing
MS33556 for guidance, except as shown in FIGURE 1. The back of the case shall provide for
the mounting of a replaceable battery module and its electrical interface connection to the
module. The electrical receptacle for the battery module on the back of the case shall be
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