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|  MIL- I-21400 (Aer)
Tube Types - The choice and application of electron tubes used in the equip-
3. 1,2
ment shall be in accordance with the following requirements and in the sequence noted:
(1) MIL-E-4682
(2) The use of any tube not meeting the requirements of (1) above shall - " .
" be approved by the Bureau of Aeronautics; however, before consider- -
`
.
ation for. approval, the "contractor shall submit the following information
(a) Quantitative data on the electrical advantages and mechanical
adequacy of the proposed tube over the most nearly equivalent
type on the acceptable listings.
Test data and performance limits of the tube which must be
maintained to insure satisfactory and reliable performance in
the equipment.
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(c) Information as to whether the tube manufacturer has received
Military or Navy qualificatiion approval for the particular tube.
.
Electron Tube Complement - A tube complement report shall be prepared .
3. 1.2.1
in accordance with Specification MIL-E-468 2 and submitted to the Bureau of Aeronautics for re-
view and approval prior to preproduction testing. The tube complement shall include all electron
tube types (including crystal diodes-and transistors) used in the equipment.
Crystal Units - The choice and application of crystal units used in the equip-
3.1.2.2
ment shall be in accordance with Specification MIL-C-3098. The use of any crystal not meeting
the requirements of MIL-C-3098 must be approved by the Bureau of Aeronautics and information
similar to that required by 3. 1.2 (2) (a), (b), and (c) shall be furnished.
Performance Objectives - Minimum size and weight, simplicity of operation,
3.1.3
ease of maintenance, and an Improvement in the performance and reliability of the specific functions
beyond the requirements of this specification are objectives which shall be considered in the pro-
duction of this equipment. Where it appears a substantial reduction in size and weight or improve-
ment in simplicity of design, performance, ease of maintenance or reliability will result from the
use of materials, parts and processes other than those specified in Specification MIL-E-5400, it
is desired their use be investigated. When investigation shows advantages can be realized, a re-
quest for approval shall be submitted to the Bureau of Aeronautics for consideration. Each request
shall be accompanied by complete supporting information.
Design and Construction
3. 2
General - This equipment shall fulfill all applicable design and construction
3. 2.1
requirements of Specification MIL-E-5400 unless otherwise specified herein.
Service Conditions - The equipment shall operate satisfactorily under any "
3. 2.2
of the environmental and mechanical service conditions or reasonable combination of these con-
ditions as specified in Specification MIL-E-5400 for Class 2 equipment.
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3.2.3 . Standard Conditions - The following conditions shall be used as a basis to .
establish normal performance requirements" and for making laboratory bench tests on the equip- .
ment: "-
Room ambient (30' C + 10 C)
Temperature
Normal ground
Altitude
None
Vibration
Room ambient up - to 90% relative humidity
Humidity
27.5 + O. 5V DC
Input voltage
4
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