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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
AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM)
ASTM-B339
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Pig Tin
ASTM-B545
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Tin, Electrodeposited Coatings of
(ASTM documents may be obtained online at https://www.astm.org or from American Society
for Testing and Materials, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959.)
SOCIETY OF AUTOMOTIVE ENGINEERS (SAE)
SAE-AS5202
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Port or Fitting End, Internal Straight Thread
(SAE documents may be obtained online at https://www.sae.org/ or from SAE World
Headquarters, 400 Commonwealth Drive, Warrendale, PA 15096-0001 USA.)
2.4 Order of Precedence. Unless otherwise noted herein or in the contract, in the event
of a conflict between the text of this document and the references cited herein, the text of this
document takes precedence. Nothing in this document, however, supersedes applicable laws and
regulations unless a specific exemption has been obtained.
3. REQUIREMENTS
3.1 Qualification. This specification defines the design, performance, and test
requirements for an AAU-34B/A Altimeter with automatic pressure standby. This specification
also provides for a similar design Altimeter AAU-34C/A which incorporates (NVIS Green A)
night vision compatible integral lighting and "blue filtered" white lighting. This specification
makes provision for qualification testing of the altimeter with its optional battery module.
Altimeters furnished under this specification shall be products that are authorized by the
qualifying activity for listing on the applicable qualified products list before contract award (see
4.4 and 6.4). Battery modules shall meet the applicable requirements of this specification.
3.2 Nonstandard parts. Standard MS and AN parts shall be used where they suit the
purpose. When no standard part is available, a nonstandard part may be used with prior approval
of the procuring activity. When dual sources for parts or components are not available, prior
approval of the procuring activity is required for use of sole source items.
3.3 Microelectronic Devices. Microelectronic devices shall meet the requirements of
MIL-PRF-38535 (monolithic) and MIL-PRF-38534 (hybrid) and be listed on the associated
Qualified Manufacturers Listing (QML).
3.4 Materials.
3.4.1 Nonmagnetic materials. Nonmagnetic materials shall be used for all parts of the
altimeter, except where magnetic materials are essential. The extent to which magnetic materials
are required shall be reported to the procuring activity.
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