(l)
After system has gone on 8th-stage bleed, hold engine power setting until system stabilizes then check that duct temperature reads 36 +4 °F (2 +2°C).
(m)
Slowly decrease engine power and check that pressure indication decreases in reverse to step (l).
(n)
Move PACK switch to OFF
(o)
Move BLEED AIR switch to OFF.
(p)
Shut engine off (Ref Chapter 71, Power Plant).
501
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C. Bleed Air Compression Control System Test With APU Running
NOTE: Operate only one pack at a time when performing the following test.
(1) Test Bleed Air Compression Control System
(a)
Open air conditioning equipment bay door.
(b)
Start APU (Ref Chapter 49, APU Ignition and Starting System).
(c)
On forward overhead panel, place ISOLATION VALVE switch to OPEN, ENGINE BLEED switches OFF, APU BLEED switch ON, and PACK switch ON.
(d)
Verify that pack valve is on high airflow regulation.
NOTE: During accomplishment of 1) and 2) check that DUAL BLEED light does not come on.
1) Allow the APU exhaust gas temperature to stabilize for a minimum of two
minutes. 2) Note the APU exhaust gas temperature. 3) Remove electrical connector from APU mode solenoid (solenoid B) on the pack
valve (Fig. 502). Check that a slight drop APU exhaust gas temperature occurs.
NOTE: This verifies the operation of the APU flow mode shift to main engine flow control.
4) Reinstall electrical connector and look for slight increase in exhaust gas temperature.
NOTE: If the exhaust gas temperature does not decrease, the pack valve is to be rejected and replaced.
(e)
Move PACK switch to OFF.
(f)
Move No. 2 ENGINE BLEED switch to ON and check that DUAL BLEED light, MASTER CAUTION lights and AIR COND annunciator light come on.
(g)
Move LIGHTS switch on panel P2 to DIM and check that DUAL BLEED light dims. Move switch back to BRT and check that light returns to full brightness.
(h)
Depress either MASTER CAUTION light. Check that both MASTER CAUTION lights and AIR COND annunciator light go out, but the DUAL BLEED light remains on.
(i)
Depress either MASTER CAUTION light. Check that both MASTER CAUTION lights and all master caution annunciator lights come on but, when released, only both MASTER CAUTION lights, the AIR COND annunciator light, and the DUAL BLEED light remain on.
(j)
Move ISOLATION VALVE switch to CLOSE and check that MASTER CAUTION lights, AIR COND annunciator light and DUAL BLEED light go out.
503
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H29017 H59353
Air Supply Duct Indicated Pressure 501
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506 Pack Valve Location
Feb 15/78 Figure 502 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 21-11-0 Page 505
(k)
Move No. 2 BLEED switch to OFF and No. 1 BLEED switch to ON and check that MASTER CAUTION lights, AIR COND annunciator light and DUAL BLEED light come on.
(l)
Move ISOLATION VALVE switch to OPEN, No. 2 BLEED switch to ON and APU BLEED switch to OFF and check that MASTER CAUTION lights, AIR COND annunciator light and DUAL BLEED light go out.
(m)
Move BLEED switches to OFF and ISOLATION VALVE switch to AUTO.
(n)
Turn APU off (Ref Chapter 49, APU Ignition and Starting System).
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MODULATING AND SHUTOFF VALVE - REMOVAL/INSTALLATION
1. General
A. The modulating end shutoff valve regulates 13th stage bleed flow when 8th stage cannot meet system flow requirements.
B. The modulating and shutoff valve is located on the lower right side of each engine.
2. Remove Modulating and Shutoff Valve (See figure 401.)
A. Gain access to valve by opening right engine cowl.
B. Disconnect sensing and pressure lines.
C. Remove clamps on both sides of valve.
D. Remove valve.
3. Install Modulating and Shutoff Valve (See figure 401.)
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