MIL-PRF-83419E
This specification is approved for use by all Departments and Agencies of the Department of
Defense.
1. SCOPE
1.1 Scope. This 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.
1.2 Classification. Altimeters covered by this specification will be of the following
types, as specified (see 6.2).
AAU-34B/A Altimeter - Integrally lighted, "aviation red" and "blue filtered"
white lighting.
AAU-34C/A Altimeter - (Type AAU-34B/A Altimeter with integral lighting
modified to provide night vision system (Type I, Class A, NVIS Green A)
compatible lighting and "blue filtered" white lighting).
2. APPLICABLE DOCUMENTS
2.1 General. The documents listed in this section are specified in sections 3, 4, or 5 of this
specification. This section does not include documents cited in other sections of this specification or
recommended for additional information or as examples. While every effort has been made to
ensure the completeness of these lists, document users are cautioned that they must meet all specified
requirements of documents cited in sections 3, 4, or 5 of this specification, whether or not they are
listed.
2.2 Government documents.
2.2.1 Specifications, standards, and handbooks. The following specifications, standards
and handbooks form a part of this document to the extent specified herein. Unless otherwise
specified, the issues of these documents are those cited in the solicitation or contract.
FEDERAL STANDARDS
FED-STD-H28/2
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Screw-Thread Standards for Federal Services
2
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