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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
the liquid crystal display shall be 1.5 ± .5FL. AAU-34C/A altimeters shall also incorporate
NVIS Type I, Class A, "Green A" night vision compatible lighting that meets the requirements
of MIL-L-85762 except the luminance level shall be 1.0 ± .5FL. The altimeter lighting shall
operate on 5V AC or DC power. Lighting acceptability of production altimeters with red and/or
white lighting shall be based on visual comparison with a prime standard. Acceptability of NVIS
lighted production altimeters shall be by a method approved by the procuring activity. Prior to
fabrication of qualification units, the method of lighting shall also be approved by the procuring
activity. Deviations from the applicable lighting specification requirements shall be submitted to
the procuring activity for approval.
3.5.4 Dial. The dial or dial assembly shall be securely retained in the instrument by
positive means of alignment and shall be of sufficient thickness that warping or distortion does
not result when the instrument is subjected to the environmental conditions specified herein. The
display assembly shall be a shop-replaceable unit (SRU) removable at depot (overhaul) without
damage.
3.5.5 Static connection. The static pressure connection (port) shall be in accordance with
SAE-AS5202-06 and located as shown on FIGURE 1. A 150-wire mesh filter screen (either
stainless steel or monel) shall be firmly installed in the static connection to prevent dirt particles
from entering the sensor. For storage, shipping and handling purposes, a plug of acceptable
material and design shall be provided. Each plug may incorporate a vent consisting of a hole at
least 1/16 inch in diameter. The plug may also incorporate suitable filtering material to prevent
the entry of particles which the supplier considers would be detrimental to the performance of
the instrument.
3.5.6 Electrical receptacle (altimeter). The electrical receptacle for interface of the
altimeter with aircraft wiring shall conform to MIL-DTL-83723 Series III and located as shown
on FIGURE 1. It shall mate with connector MS24266-R16T-24SN. The electrical connections
to the receptacle shall be as shown on FIGURE 3. The receptacle shall be provided with a
suitable cap for shipping, handling and storage purposes. Altimeters shall be tested and
delivered with suitable cover plate for the battery module receptacle to protect the instrument
from damage as a result of exposure to the service conditions and tests specified herein as well as
for shipping and handling. The cover plate shall be removable for installation of a battery
module if required. The cover for the battery receptacle is subject to the prior approval of the
government.
3.5.6.1 Electrical receptacle (battery module). An electrical receptacle as shown in
FIGURES 1 and 3 and approved by the procuring activity shall be provided to interface the
altimeter with the battery module connector (header type) 86098-16-D-05. The module header
meets the requirements of Defense Electronics Supply Center, OH, Drawing 86098-16-D-05.
When the module is mounted to the altimeter, the electrical connector shall mate with the
receptacle of the altimeter and provide the power, signal, and returns identified by FIGURE 3
and 3.5.8.
3.5.7 Battery Module Interface. The altimeter shall be designed to operate with a battery
module installed on the rear of the case. The mechanical and electrical interfaces shall conform
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