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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
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Fire Resistant Liner and Insulation
The inner surface of the door is fire resistant. The inside surface
is covered with an insulating blanket and a titanium fire wall
liner.
Operation
To open the APU access door, do these steps:
* Push the latch trigger buttons to open the latches. This
causes the latches to release and the latch handles to come
out of fair with the door skin. This disengages the latch hooks
and their door frame fittings. Hold the door while you pull on
the latch handles.
* Lower the door manually to the open position.
* Secure the door in the open position with the door support
rods.
To close the door, do these steps:
* Return the door support rods to their stowed position.
* Move the door to the closed position.
* Use the latch handles to mate the latch hooks with their door
frame fittings.
* Push the latch handles to fair with the door skin. This
secures the latches. Only hand pressure is required to close
the latches.
DOORS - SERVICE - AUXILLIARY POWER UNIT COWL DOOR
EFFECTIVITY
GUN ALL 52-40-00
Page 20
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
52-40-00-010
DOORS - SERVICE - AUXILLIARY POWER UNIT COWL DOOR
DOORS - SERVICE - AUXILLIARY POWER UNIT COWL DOOR
EFFECTIVITY
GUN ALL 52-40-00
Page 21
D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
52-40-00-010
Purpose
The refueling station access door does these things:
* Gives access to the wing pressure fueling manifold and the
P15 fueling panel
* Enables the P15 fueling panel controls and indications
* Controls the refueling station access door flood lights.
Location
The refueling station access door is on the leading edge of the
right wing, outboard of the engine.
General Description
The refueling station access door hinges on its forward edge. It
is held closed by four push-button latches on its aft edge. It
swings downward and is held in the fully open position by a
latching telescopic rod. You must release the catch on the rod
before you close the door.
See the the fuel chapter for more information on fueling
indication and control. (CHAPTER 28)
Operational Displays
When the refueling station access door opens, the flood lights
on the door come on.
When it is open, the refueling station access door enables the
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