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cause the latch to open. When the latch is secure (closed), the
outer surface is similar in color to the adjacent structure. The
other surfaces of the latch are a bright red fluorescent color.
This permits rapid visual detection of an unsecure (open) latch.
A scupper drain on the door drains the water separator if the
ram air spray line from the water separator freezes or clogs.
Door Structure
The doors are composite construction.
Operation
You open and close the air conditioning access doors manually.
To release the latches, apply moderate thumb pressure to the
latch trigger (marked PUSH). Manually restrain the door from
free fall as you release the latches.
When the door is unlatched, ease it down and secure it in the
open position. The door has a brace that supports it in the open
position. Pull the brace from a catch on the door. Then connect
the brace to the support bracket in the air conditioning pack
compartment. Return the brace to the stowed position before
you close the door.
Training Information Point
The air conditioning access doors do not give access to the ram
air inlet ducts. The ram air inlet ducts access is through panels
outboard of the air conditioning access doors.
DOORS - SERVICE - AIR CONDITIONING ACCESS DOORS
EFFECTIVITY
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52-40-00-005
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EFFECTIVITY
GUN 201-999 52-40-00
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DOORS - SERVICE - AIR CONDITIONING ACCESS DOORS
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Purpose
The APU access door gives access to the APU and its
accessories.
Location
The APU access door is part of the lower surface of the
fuselage. It is under the horizontal stabilizer.
General Description
The APU access door has hinges on the right side. Three
latches on the left side hold the door closed. The door swings
downward as it opens.
The APU access door has these parts:
* Door frame and structure
* Hinges
* Latches
* Door support rods
* Lower APU fire detector element.
* Fire resistant liner and insulation
* Fluid drain system.
Door Frame and Structure
The door frame and structure is aluminum alloy extrusions and
clad aluminum alloy sheet. The door does not hold pressure.
Hinges
Two hinges give the door a pivot axis. You remove the hinge
pins to remove the door.
Latches
Three push-button latches hold the door closed. Moderate
pressure on the push-button trigger will cause the latch to open.
They are a fail-safe design. Failure of the trigger return
mechanism will not cause the latch to open.
When the latch is secure, the outer surface is similar in color to
adjacent structure. The other surfaces of the latch are a bright
red fluorescent color. This allows rapid visual detection of an
unsecure latch.
Door Support Rods
Door support rods hold the door in the open position. You
deploy and stow the support rods manually.
Fluid Drain System
A fluid drain system drains fluids from the APU compartment.
Fluid collects in drain cups and flows in drain lines to the drain
mast. The fluids then drain overboard through the mast.
Lower APU Fire Detection Element
The lower APU fire detector element is on the inner door liner.
DOORS - SERVICE - AUXILLIARY POWER UNIT COWL DOOR
EFFECTIVITY
GUN ALL 52-40-00
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