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When all of these conditions occur, the SMYDs energize the two
solenoids. The solenoid valves send extend pressure to the
pressure-operated valves. This permits either pressureoperated
valve to send extend pressure to the full extend port
on the LE slat actuators. If one valve, solenoid, or SMYD has a
failure, the pressure still goes to the actuators.
LE AUTOSLAT SYSTEM - AUTOSLAT CONTROL VALVE
EFFECTIVITY
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LE AUTOSLAT SYSTEM - AUTOSLAT CONTROL VALVE
LE AUTOSLAT SYSTEM - AUTOSLAT CONTROL VALVE
EFFECTIVITY
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LE AUTOSLAT SYSTEM - AUTOSLAT CONTROL VALVE
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Functional Description
The SMYDs energize the solenoids in the autoslat control valve
if all these conditions are true:
* Angle-of-attack more than a limit.
* Airplane in the air
* Computed airspeed less than 230 knots
* TE flaps not up
* Autoslat function valid
The autoslat function is available if the angle-of-attack data is
valid and there are no failures to a SMYD or the autoslat valve.
The angle-of-attack data comes from the angle of airflow
sensor.
The airplane in air data comes from the PSEU.
The airspeed data comes from the air data inertial reference
units (ADIRUs).
The TE flaps not up data comes from the TE flap position
sensors. When the TE flaps are not up, the LE slats are not up.
The autoslat function can only extend the LE slats from extend
to full extend. This function can not extend the LE slats when the
LE slats are in the up position.
The angle-of-attack limit is a function of these:
* TE flap position
* Thermal anti-ice (TAI) system condition.
The SMYDs send an autoslat command at a lower angle-ofattack
if the TE flaps are at 5 than if the TE flaps are at 1.
During an autoslat command, the SMYDs also send a signal to
the FSEU for LE flaps and slats UCM logic.
The SMYDs receive thermal anti-ice system data from the
display electronics units (DEUs). The SMYDs send an autoslat
command at a lower angle-of-attack if the thermal anti-ice
system is on. This occurs when the wing anti-ice switch is on or
when one of the engine anti-ice switches are on.
See the navigation chapter for more information on the angle of
airflow sensor and the ADIRU. (CHAPTER 34)
See the landing gear chapter for more information on the PSEU.
(CHAPTER 32)
See the trailing edge flap section for more information on the
flap position sensors. (SECTION 27-51)
See the ice and rain protection chapter for more information on
the thermal anti-ice system. (CHAPTER 30)
LE AUTOSLAT SYSTEM - FUNCTIONAL DESCRIPTION
EFFECTIVITY
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Indications
When the autoslat function becomes active, the SMYDs send a
signal to the FSEU. The FSEU uses this data to inhibit the LE
FLAPS TRANSIT light during autoslat extension of the LE slats
in the air. During ground tests of the autoslat system, the LE
FLAPS TRANSIT light comes on and the LE FLAPS EXT light
goes out.
If the autoslat function is not available in one SMYD, then the
other SMYD can still operate the autoslat function. To see
indication of this condition, press the master caution recall
switch. This causes the autoslat fail light to show. If you press
the master caution reset switch, the autoslat fail light goes out of
view.
The autoslat signal is tested during each flight. Each time the TE
flaps move from 10 to 15, the SMYDs energize the solenoids in
the autoslat control valve. If the autoslat function is not available
in both SMYDs, then the autoslat fail light shows.
The autoslat signal is tested during each flight. Each time the TE
flaps move from 10 to 15, the SMYDs energize the solenoids in
the autoslat control valve. If the autoslat function is not available
in both SMYDs, then the autoslat fail light shows.
Training Information Point
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