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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).
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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
overwing door is unlocked when it should be locked:
* The related overwing light on the P5-20 door warning
annunciator module comes on
* The MASTER CAUTION and DOORS annunciator lights come
on.
The signal to lock/unlock the emergency exit door comes from
the flight lock logic in the PSEU.
When the airplane is on the ground and the thrust levers are
less than 53 degrees TRA (thrust resolver angle), the flight lock
logic in the PSEU deenergizes the flight lock relay, R742. When
R742 is deenergized, the flight lock solenoid is deenergized and
the flight lock solenoid switch is in the NOT LOCKED position.
When the airplane starts its take off roll, the flight lock logic
energizes the flight lock relay, R742. The flight lock solenoid
energizes when the R742 flight lock relay energizes and R737 or
R738 engine running relay energizes. When the flight lock
solenoid is energized, the flight lock solenoid switch is in the
LOCKED position.
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The engine running relays, R737 and R738, are energized when
the display electronic unit (DEU) sends an engine run signal.
The DEU sends an engine run signal when all of these
conditions occur:
* The engine start lever is in idle
* The electronic engine control (EEC) discrete is set to RUN, or
N2 > 50% (if the digital data bus is invalid).
The 1.5 second time delay prevents nuisance indications.
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