There are two NO GND SPLRS lights located on the windshield
center post. They are illuminated under the following conditions:
• Operational logic parameters are satisfied
• GND SPLR switch selected to ARMED
• Left wing, right wing, or left and right wing ground spoilers did
not deploy
The purpose of the lights is to advise the flight crew that any or all
ground spoilers did not deploy following touchdown, so that the
speed brakes may be extended as a precautionary measure. When
the NO GND SPLRS lights are activated, the MASTER WARN lights
on the pilot’s and copilot’s glareshield are illuminated and a three-
chime aural warning tone also sounds.
(3) GND SPOILER Warning Message:
The ground spoiler system is monitored by a warning circuit that will
detect certain in-flight and on-ground malfunctions within the ground
spoiler system. A red GND SPOILER warning message will be
displayed on the Crew Alerting System (CAS) should any of the
following events occur in the configuration given:
(a) In flight:
• One or both ground spoilers not fully retracted with
SPEED BRAKE handle in RETRACT detent.
• One or both solenoid-operated hydraulic control
valves electrically energized.
• One or both Weight-On-Wheels (WOW) relays in the
GROUND mode.
• One or both power lever ground idle relays energized.
• Ground spoiler pressure switch senses hydraulic
pressure.
(b) One the ground, ground spoilers not armed:
• One or both ground spoilers not fully retracted with
SPEED BRAKE handle in RETRACT detent.
• One or both solenoid-operated hydraulic control
valves electrically energized.
• One or both power lever ground idle relays energized.
• Ground spoiler pressure switch senses hydraulic
pressure.
(c) On the ground, ground spoilers armed, either power lever not
in ground idle detent:
• One or both solenoid-operated hydraulic control
valves electrically energized.
• One or both power lever ground idle relays energized.
• Ground spoiler pressure switch senses hydraulic
pressure.
• One or both ground spoilers not fully retracted.
(4) GND SPLR TEST Switch:
OPERATING MANUAL
PRODUCTION AIRCRAFT SYSTEMS 2A-27-00
Page 37
May 22/01
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