I A P 2 0 2 3 . 0 0 1 - A F M / I R I S T E X A N I I P A G E | 55
FOR SIMULATION USE ONLY ā NOT A TRAINING AID
EMERGENCY EXTENSION
Emergency flap extension is enabled after the emergency landing gear extension
handle is operated. Following landing gear extension, setting either flap selector to
or LDG controls emergency flap extension to the TO or LDG position.
The emergency selector valve is solenoid operated and is located in the hydraulic
power system emergency manifold.
The flaps cannot be retracted after emergency extension until the aircraft is
serviced by maintenance.
FLAP INDICATOR
A flap indicator (see Figure 1-2) is located above the landing gear control handle on
the lower left side of the instrument panel in each cockpit. The flap position is
indicated by a pointer which points at one of three position marks. The position
marks match the flap lever markings of UP, TO (take-off), and LDG (landing).
During extension or retraction, the position pointer moves to an intermediate
position between the placarded settings to indicate flap motion.
When power is removed from the flap indicator (e.g., battery switch OFF or battery
bus failure), the position pointer moves to a position counter clockwise of the UP
position.
SPEED BRAKE SYSTEM
The speed brake control system operates a single ventral plate, located between
the flaps, through a hydraulic actuator.
The EICAS advisory SPDBRK OUT is illuminated any time the speed brake is
extended.
The speed brake is held extended or retracted by hydraulic pressure in the
actuator. The actuator incorporates an internal hydraulic uplock to keep the speed
brake retracted when the engine is off.
A system of cables, pulleys, and push-pull flexible cables connected from the speed
brake to the elevator trim tab actuator automatically inputs pitch trim as the speed
brake is operated.
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