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REVERSE THROTTLE LEVER
INTERLOCK BAULK POSITION
In the event that a thrust reverser should become unlocked, an EICAS message will be displayed, an aural warning is generated and the thrust is retarded to Idle regardless of thrust lever position.
Volume 2 Flight Crew Operating Manual Rev 2A, Apr 11, 2005
Reverser System Lock-Out
In the event that a reverser is failed (inoperative), the affected reverser can be locked out.
GF1810_072
Each door can be fixed in the closed position by an inhibition bolt and by use of a manual inhibit lever on the isolation control unit.
When fitted, the red bolts, will protrude above the cowl surface and can be seen by the crew on walkaround. The bottom bolt is located at approximately the six o’clock position and the top bolt at the 12 o’clock position. The EICAS message will remain posted, but can be scrolled out of view.
Rev 2A, Apr 11, 2005 Flight Crew Operating Manual Volume 2
POWER PLANT
The engine starting system consists of the Starter Air Valve (SAV), interfacing with the EEC and the Air Turbine Starter (ATS). Pneumatic bleed air is routed through the SAV and drives the ATS, which in turn drives the HP compressor via the accessory gearbox.
The EEC receives start commands from the cockpit. SAV position is fed to both EEC lanes and is powered by 28VDC.
Volume 2 Flight Crew Operating Manual Rev 2A, Apr 11, 2005
POWER PLANT
STARTING AND IGNITION (CONT'D)
The EEC also controls both high energy igniter boxes for starting and relighting and the ignition system is powered by 28 VDC.
Rev 2A, Apr 11, 2005 Flight Crew Operating Manual Volume 2
POWER PLANT
Starter Air Valve (SAV)
The SAV controls the air supply to the starter motor. The SAV is controlled by either channel of the EEC from crew input.
During AUTO ground starts the EEC will, on command from the crew, open the SAV, initiate engine rotation, supply fuel and ignition and monitor engine parameters during start. The EEC will also close the SAV, disengage the starter motor and switch off ignition, at starter cutout speed.
During manual ground starts, opening and closing of the SAV and HPSOV is controlled by the crew. The EEC will control ignition sequencing, after ignition is enabled by the crew.
The SAV can also be operated manually, by ground personnel, in the event of a valve failure.
The SAV is displayed on the BLEED /ANTI-ICE synoptic, anytime an engine is not operating.
STARTER AIR VALVE
GF1810_075
Air Turbine Starter (ATS)
The ATS rotates the HP compressor to enable engine start.
The ATS comprises a single stage turbine, a tungsten cutter (to cut off turbine, if rotor bearings fail), a sprag type clutch, an output drive shaft decoupler (prevents driving the turbine, in the event the sprag clutch seizes) and an output drive shaft shear neck (protects the gearbox, in the event the starter overtorques or seizes).
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