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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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PNEUMATIC - APU BLEED SYSTEM - INTRODUCTION
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Purpose
The APU pressure relief valve protects the pneumatic ducts
from too much pressure. This can occur if the pressure
regulating function of the APU bleed system fails. Too much
pressure can rupture the ducts.
Physical Description
The APU pressure relief valve has these parts:
* Valve body
* Cap
* Jam nut
* Pressure relief vents.
Location
The APU pressure relief valve is on the APU bleed air duct. It is
in the section 48 stabilizer compartment under the catwalk.
Functional Description
The APU pressure relief valve is a spring-loaded, air operated,
pressure relief device.
The spring holds the poppet closed at pressures less than 75
psi (nominal).
Duct pressure more than 75 psi pushes the poppet off its seat.
This opens the valve. The open valve relieves duct
overpressure.
When duct pressure is less than 65 psi, the spring returns the
poppet to its seat. This closes the valve.
Training Information Point
Remove and replace the old valve packing ring and replace it
with a new packing ring when you install a new APU pressure
relief valve.
Before you install a new APU pressure relief valve, apply a thin
layer of antiseize compound to the mounting threads of the
valve. The combination of the mounting thread forces and high
duct temperatures can cause uncoated valve mounting threads
to seize in their mounting boss.
Use the valve body wrench flats when you install the valve. Do
not use a wrench on the jam nut or cap. This can have an effect
on valve spring preload.
PNEUMATIC - APU BLEED SYSTEM - APU PRESSURE RELIEF VALVE
EFFECTIVITY
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PNEUMATIC - APU BLEED SYSTEM - APU PRESSURE RELIEF VALVE
PNEUMATIC - APU BLEED SYSTEM - APU PRESSURE RELIEF VALVE
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Purpose
The DUAL BLEED light does these things:
* Tells the crew that an engine (or engines) and the APU both
supply pressure to the pneumatic manifold at the same time.
* Reminds the crew to put the thrust levers to the idle position
during DUAL BLEED conditions.
Functional Description
The DUAL BLEED indication circuit uses 28v dc electrical
power.
Power goes to the light when the bus has power. When airplane
logic supplies a ground to the circuit, the light comes on. The
circuit has two paths to ground. Both paths rely on switch and
valve position logic.
The DUAL BLEED light comes on for either of these conditions:
* Engine 1 BLEED switch ON and the APU bleed air valve open
* Engine 2 BLEED switch ON, the isolation valve OPEN, and
the APU bleed air valve open.
The DUAL BLEED light can make sure that the APU bleed air
valve is in the close position. When the APU bleed valve is open
and the engine 1 BLEED switch is ON, the DUAL BLEED light
shows the valve is not in the close position. When the APU
BLEED switch is OFF and the engine 1 BLEED switch is ON, the
DUAL BLEED light goes off when the APU bleed air valve
closes.
PNEUMATIC - APU BLEED SYSTEM - DUAL BLEED LIGHT - FUNCTIONAL DESCRIPTION
EFFECTIVITY
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PNEUMATIC - APU BLEED SYSTEM - DUAL BLEED LIGHT - FUNCTIONAL DESCRIPTION
PNEUMATIC - APU BLEED SYSTEM - DUAL BLEED LIGHT - FUNCTIONAL DESCRIPTION
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Purpose
The indicating system gives the flight crew displays of the
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