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Page Title: Table 2-1. Instrument Test Chart
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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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