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TM 55-4920-400-13
Table 2-1. Instrument Test Chart
Overpressure
S y s t e m L e a k
Safety
Max.
Instrument
Check
Release
Check
Allowable
O p e r a t i o n a l
Point
Point
Point
Leak Rate
Rate
10 in. every 15 seconds,
maximum 10 in. every 20
seconds, minimum (30-20
range)
Manifold (vacuum) 10 in.
+0, -1 in.
11 in.
l/4 in. merc.
mercury
mercury
mercury
per minute
Airspeed
400
knots
+20, -1
knots
200
knots
6 knots per
minute
35 seconds, maximum; 25
seconds, minimum (for
full scale indication)
Altitude
35,000
ft.
+5000,
-0 ft.
25,000
ft.
25 ft. per
minute
Rate-of-climb (ascending
or descending) not to ex-
ceed 5000 ft. per minute.
Rate-of-climb (ascending
or descending) not to ex-
ceed 5000 ft. per minute.
Negative altitude None
None
-1000 ft.
50 ft. per
minute
Section IV. OPERATION UNDER USUAL AND UNUSUAL CONDITIONS
2-28.
Movement of Equipment-Usual Condition.
knobs in the OFF position and the knobs turned to
open valves before starting tests.
CAUTION
2-30. Other Unusual Conditions.
Do not permit oil to enter the lines as
it will damage the control and instru-
ments (para. 2-38).
CAUTION
Contamination in the pneumatic or
lubricating systems will damage the
instruments, controls and the pump.
a. The tester can be carried from one work area
to another when the accessories are stowed in the cover
compartment which is installed on the tester, and all
access panels latched. Keep the tester in an upright po-
sition at all times when there is oil in the reservoir.
a. When operating the tester in extreme condi-
tions of snow, ice, rain, mud, dust, salt air, or similar
conditions, do everything possible to prevent foreign
material from entering the pneumatic or lubricating
systems.
b. After operation in extreme conditions, thor-
oughly clean, dry and lubricate the tester and accesso-
ries (fig. 2-1).
2-29. Extremes of Heat and Cold-Unusual Condi-
tions.
The tester is designed to operate in tempera-
tures from -40F to +160F (-40°C to +71°C). When op-
erating in high temperatures to 160°F, use extreme
caution to keep tester within operating limits. For low
temperature operating range (from +32°F to -40°F, run
the pump for at least 5 minutes with both selector valve
2-6
Change 2
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