(21)
Place test set SYSTEM SELECTOR valve handle to B.

(22)
Place test set DIFFERENTIAL SELECTOR valve handle to B.

(23)
Turn test set primary regulator knob clockwise until a reading of 35 +3 psig is obtained on primary system gage.

(24)
Using the manual control rod, manually open solenoid A on pack valve.

(25)
Check that pack valve butterfly is open by observing the visual indicator.

(26)
Turn test set PRESS REG No. 1 clockwise until a reading of 8.0 +0.1 psig is obtained on GAGE No. 3.

(27)
Turn DIFF BLEED valve counterclockwise until a reading of 4.6 +0.2 inches of mercury is obtained on GAGE No. 2. Check that pack valve butterfly remains open by observing visual indicator.

(28)
Turn DIFF BLEED valve counterclockwise until a reading of 7.0 + 0.2 inches of mercury is obtained on GAGE No. 2. Check that pack valve butterfly begins to close or is closed by observing visual indicator.

(29)
Turn DIFF BLEED valve clockwise until a zero indication is obtained on GAGE No. 2.

(30)
Turn PRESS REG No. 1 clockwise until a reading of 15 + 1 psig is obtained on GAGE No. 3.

(31)
Turn DIFF BLEED valve counterclockwise until a reading of 3.6 +0.2 inches of mercury is obtained on GAGE No. 2. Check that pack valve butterfly remains open by observing visual indicator.

(32)
Turn DIFF BLEED valve counterclockwise until a reading of 5.6 +0.2 inches of mercury is obtained on GAGE No. 2. Check that pack valve butterfly begins to close or is closed by observing visual indicator.

(33)
Turn DIFF BLEED valve clockwise until a zero indication is obtained on GAGE No. 2.

(34)
Turn PRESS REG No. 1 clockwise until a reading of 23 +2 psig is obtained on GAGE No.

3.

(35)
Turn DIFF BLEED valve counterclockwise until a reading of 3.0 +0.2 inches of mercury is obtained on GAGE No. 2. Check that pack valve butterfly remains open by observing visual indicator.

(36)
Turn DIFF BLEED valve counterclockwise until a reading of 4.4 +0.2 inches of mercury is obtained on GAGE No. 2. Check that pack valve butterfly begins to close or is closed by observing visual indicator.

(37)
Turn DIFF BLEED valve clockwise until a reading of 4.0 inches of mercury is obtained on GAGE No. 2. Note position of butterfly by observing visual indicator.

(38)
Energize pack valve solenoid B (Fig. 103). Check that pack valve butterfly moves toward open or is opened.

(39)
Turn test set DIFF BLEED valve clockwise until a zero indication is observed on GAGE No. 2.

(40)
Turn PRESS REG No. 1 counterclockwise until a zero indication is observed on GAGE No. 3.

(41)
Manually close pack valve solenoid A.

(42)
Turn primary regulator knob counterclockwise until a zero indication is observed on primary system gage.

(43)
Place DIFFERENTIAL SELECTOR valve handle to OFF.

(44)
Close SHUTOFF VALVE No. 2 and 3.

(45)
Disconnect all three test hoses and stow.

(46)
Install caps on test set fittings No. 1, 5 and 6.

(47)
Remove 290166 adapters from pack valve venturi test port and downstream pressure test port and install plugs.

(48)
Remove 290395-1 adapter from pack valve filter test port and install plug.

(49)
Close test set cylinder shutoff valve.

(50)
Remove special purpose electrical cable and install solenoid A electrical connectors.

(51)
Close air conditioning equipment bay door.

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ENGINE BLEED AIR COMPRESSION CONTROL SYSTEM - SERVICING
1.  General
A.  Sensing lines are required in the compression control system to interconnect and transmit pressures between components. Since a collection of moisture in any of these lines could cause inaccurate pressure transmittals or cause the tubing to split should the moisture freeze, drain plugs are provided.
B.  Two pressure sensing lines to each pack valve and one line to each pressure transmitter are provided with a drain plug (Fig. 301).
2.  Moisture Removal
A.  Open air condition bay door to gain access to drain plugs.
B.  For pack valve sensing lines, remove drain plugs located adjacent to keel beam and inboard of the pack valve (View 2, Fig. 301).
C.  For pressure transmitter, remove drain plug from line beneath the transmitter. The transmitter is attached to the outboard side of the equipment bay near the forward end (View 1).
　
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