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ATPD-2167 5 January 1990 ii ATPD-2167
5 January 1990

ii


ATPD-2167
5 January 1990

ii
ATPD-2167
5 January 1990

ii

TABLE OF CONTENTS

(This is a hyper-linked document. Actual on file document will vary in format only)




Para. No.
Title
Page

1.
SCOPE
1

1.1
Purpose
1
1.2
General requirements
1

2.
APPLICABLE DOCUMENTS

5

2.1
Government documents
5
2.2
Other publications
6

3.
TEST METHODS
7

3.1
Temperature
7
3.2
Vibration
9
3.3
Shock
10
3.4
Humidity
15
3.5
Salt fog
19
3.6
Fungus
25
3.7
Dust and sand
34
3.8
Rain and wind
38
3.9
Solar radiation
39
3.10
Cleaning spray
45
3.11
Submergence
48
3.12
Chemicals
49
3.13
Bench handling shock
49
3.14
Temperature shock
50
3.15
Explosive atmosphere
51









ATPD-2167
5 January 1990

ii





LIST OF FIGURES


Figure No.
Title
Page

1
Peak vibration envelopes

11
2
Vibration logarithmic sweep range
12
3
Half sine shock pulse configuration
13
4
Shock measuring system frequency response
16
5
Humidity cycle
18
6
Variations of specific gravity of salt
(NaCL)

solution with temperature
22
7
Salt solution filter
24
8
Location of salt solution filter
in reservoir
24
9
Solar radiation test cycles

47
10
Explosive atmosphere air weight
- temperature

characteristics, chamber volume dependent
53
11
Explosive atmosphere fuel weight
- temperature

characteristics

56
12
Explosive atmosphere fuel weight
- temperature

characteristic correction factors
57


LIST OF TABLES


Table No.
Title
Page


I
Test fungi
30
II
Dust and sand particle size blend
36
III
Dust/quartz sand composition
36
IV
Spectral energy distribution and permitted tolerances
42







ATPD-2167
5 January 1990

1

ENVIRONMENTAL TEST METHODS

M1 TANK PROGRAM

(FOR THE M1 WEAPON SYSTEM ONLY)


1. SCOPE


1.1 Purpose. This document establishes uniform environmental test methods for
determining the resistance of land mobility vehicle equipment to the effects of natural
and induced environments peculiar to military operations. It includes environmental test
methods that will provide, as much as possible, consistently reproducible test results.
The test methods described herein are intended to be implemented by reference in
contractual documents and apply to all land mobility vehicle equipment. When it is
known that the equipment will encounter conditions more severe or less severe than the
environmental levels stated herein, the test may be modified by the applicable
document (specification, drawing, Quality Assurance Requirement (QAR), etc).


1.2 General requirements.


1.2.1 Test conditions. Unless otherwise specified herein or in the equipment
specification, measurements and tests shall be made at standard ambient conditions.
Standard ambient conditions are:



Temperature
73 ± 18 degrees Fahrenheit (°F)



Relative humidity
50 ± 30 percent



Atmospheric pressure
28.5 (+2.0, -3.0) inches of Mercury (in. Hg)


1.2.1.1 Tolerances. Unless otherwise specified, tolerance of test conditions
shall be as follows:


a.
Air temperature at the control sensor shall be ±2.5°F. The equipment
sensor response time (T) shall be 20 seconds or less. Temperature
gradient across the cross-sectional area occupied by the test item
shall not exceed 0.5°F per foot in any direction, but never more than
4°F total (equipment nonoperating).


NOTE:
(T) is the time required for the sensing system to respond to
62.3 percent of a step change in temperature in the
measured environment.



b. Pressure: When measured by devices such as manometers, ±5
percent or 0.059 inch of mercury, whichever provides the greatest ATPD-2167
5 January 1990

2
accuracy. When measured by devices such as ion gages, ±10
percent to 10-1 Torr.



c.
Relative humidity at the control sensor: ±5 percent.



d.
Vibration amplitude: ±10 percent.



e.
Vibration frequency: ±2 percent, or ±1/2 Hertz (Hz) below 25 Hz.



f.
Acceleration: ±10 percent.


1.2.1.2 Test apparatus accuracy. The accuracy of instruments and test
equipment used to control or monitor the test parameters shall be verified and shall
satisfy the requirements of
MIL-STD-45662
to the satisfaction of the procuring activity.
All instruments and test equipment used in conducting the tests specified herein shall:
conform to laboratory standards whose calibration is traceable to the prime standards at
the National Institute of Standards and Technology; and, unless otherwise specified in
the equipment specification, have an accuracy of at least one-third the tolerance for the
variable to be measured (in the event of conflict between this accuracy and a
requirement for accuracy in any one of the test methods of this document, the latter
shall govern).


1.2.2 Test temperature stabilization.


1.2.2.1 Operating. Unless otherwise specified herein or in the equipment
specification, temperature stabilization will have been attained when the temperature of
the part of the test item considered to have the longest thermal lag is changing no more
than 3.6°F per hour.


1.2.2.2 Nonoperating. Unless otherwise specified, temperature stabilization will
have been attained when the temperature of the part of the test item considered to have
the longest thermal lag reaches a temperature within 3.6°F of the prescribed
temperature, except that any critical component (e.g., battery electrolyte for engine
starting test) will be within 1.8°F. When changing temperatures, the temperature of the
chamber air may be adjusted up to 9°F beyond the desired end point for a period of
time of up to 1 hour to reduce stabilization time, provided that the stabilization
requirements of this paragraph are ultimately attained relative to the specified end point
temperature, and provided the extended chamber temperatures will not cause damage
to the test item.


1.2.3 Performance of test.


1.2.3.1 Pretest performance record. Prior to proceeding with any of the
environmental tests, the test item shall be operated under standard ambient conditions
(see 1.2.1) to obtain data for determining satisfactory operation of the item as specified ATPD-2167
5 January 1990

3
in the equipment specification. A record of specific pretest data shall be made to verify
that the test item performed within the equipment specification requirements.

NOTE: It shall be permissible during consecutive environmental tests to use
post environmental performance test data (see 1.2.3.4) as pretest
performance test data as long as the item under test has not been
mishandled and was stored under standard ambient conditions as
defined in 1.2.1.


1.2.3.2 Installation of test items in test facility. Unless otherwise specified, the
test item shall be installed in the test facility in a manner that will simulate service
usage, making connections and attaching instrumentation as necessary. Plugs, covers,
and inspection plates not used in operation, but used in servicing shall remain in place.
When mechanical or electrical connections are not used, the connections normally
protected in service shall be adequately covered. For tests where temperature values
are controlled, the test chamber shall be at standard ambient conditions when the test
item is installed. The test item may then be operated to determine that no malfunction
or damage was caused due to faulty installation or handling when operation is required
during exposure to the specified test.


1.2.3.3 Performance check during test. When operation of the test item is
required during the test exposure, suitable tests shall be performed to determine
whether the test exposure is producing changes in performance when compared with
pretest data.


1.2.3.4 Post-test data.


1.2.3.4.1 Preproduction (qualification) and initial production (first article) testing.
At the completion of each environmental test, the test item shall be inspected for
damage and tested in accordance with the equipment specification. The test results
(data) shall be compared with the pretest data obtained in accordance with 1.2.3.1.