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are on the door.
The circuits for the lights are in the proximity switch electronics
unit (PSEU).
The door warning annunciator module contains the amber
lights. It is on the P5 forward overhead panel.
Operation
The sensor senses the proximity or absence of the actuator and
provides the signal to the switch card. The switch card uses this
signal for the warning light to come on or go out.
The forward access door and the EE compartment door share
the same door warning light. A microswitch is at each access
door.
When a warning light comes on, the MASTER CAUTION and
DOORS annunciator also come on.
When the cargo door is unlatched, the switch card enables
cargo compartment lights.
See the cargo compartment lights section. (SECTION 33-36)
DOORS - DOOR WARNING SYSTEM - FUNCTIONAL DESCRIPTION
EFFECTIVITY
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Purpose
The flight lock logic monitors the airplane systems and sends a
signal when the emergency exit door should be locked or
unlocked.
General Description
All of these conditions cause the emergency exit doors to lock:
* Three or more of the entry/service doors are closed
* Either engine is running
* Air ground logic is in the AIR MODE or both the left and right
thrust levers are advanced more than 53 degrees (TRA).
The flight lock logic is a part of the proximity switch electronic
unit (PSEU).
Training Information Point
The engine running signal comes from the display electronic
unit (DEU). There is an engine running signal when these
conditions occur:
* Engine start lever is in idle
* Electronic engine control (EEC) discrete is set to RUN, or N2
more than 50 percent (if the digital data bus is invalid).
DOORS - DOOR WARNING SYSTEM - EMERGENCY EXIT DOOR - FLIGHT LOCK LOGIC
EFFECTIVITY
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DOORS - DOOR WARNING SYSTEM - EMERGENCY EXIT DOOR - FLIGHT LOCK LOGIC
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Purpose
The door warning system gives the crew an indication when an
emergency exit door is not latched or in an uncommanded
condition (locked or unlocked).
Functional Description
There are two door closed switches on the frame of each
emergency exit door. One switch is on the forward portion of the
frame, the other switch is on the aft portion of the frame. When
one or the other of these switches is in a NOT CLOSED position,
an indication is provided to the flight crew.
These are the flight crew indications when a door closed switch
is in the NOT CLOSED position:
* The related overwing light on the P5-20 door warning
annunciator module comes on
* The MASTER CAUTION and DOORS annunciator lights come
on.
When the airplane is on the ground and has not started its
takeoff roll, the emergency exit doors should be unlocked. If an
emergency exit door is locked when it should be unlocked,
indication is provided to the flight crew. These are the
indications when an emergency exit door is locked when it
should be unlocked:
* The PSEU light on the P5 aft overhead panel comes on (and
is not resetable)
* The MASTER CAUTION and OVERHEAD annunciator lights
come on.
After the airplane starts its takeoff roll or is in the air, the
emergency exit doors should be locked. If an emergency exit
door is unlocked when it should be locked, indication is
provided to the flight crew. These are the indications when an
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