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(HPSOV) in the hydromechanical unit (HMU)
* EEC channels A and B reset.
See the engine fuel and control, engine control section for more
information on the HPSOV. (SECTION 73-21)
See the engine ignition chapter for more information on the
ignition system. (CHAPTER 74)
The EEC reset feature lets the EEC operate correctly after a
software error occurs in the EEC. See the engine fuel and
control chapter for more functional description information on
the EEC. (CHAPTER 73)
See the fuel chapter for more information on the fuel system.
(CHAPTER 28)
See the common display system section for more information
on the CDS/DEU. (SECTION 31-62)
See the flight controls chapter for more information on the flight
data acquisition unit. (CHAPTER 27)
ENGINE CONTROLS - START LEVER - FUNCTIONAL DESCRIPTION
EFFECTIVITY
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ENGINE CONTROLS - START LEVER - FUNCTIONAL DESCRIPTION
ENGINE CONTROLS - START LEVER - FUNCTIONAL DESCRIPTION
EFFECTIVITY
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General
The reverse thrust interlock solenoids energize to permit
further movement of the reverse thrust levers during a T/R
deploy operation. If the reverse thrust interlock solenoid does
not energize, you cannot move the reverse thrust lever and
increase reverse thrust. The solenoids energize when the T/R
sleeves are 60% of travel to the full deploy position. Each EEC
controls one of the solenoids. See the thrust reverser control
section for more information. (SECTION 78-34)
Reverse Thrust Interlock Solenoids
There are two reverse thrust interlock solenoids, one for each
thrust lever assembly. They are a rotary solenoid type. Each
reverse thrust interlock solenoid uses a rod to operate a latch.
When you move a reverse thrust lever to the DEPLOY position,
a contour on the brake mechanism catches the latch. This stops
the rotation of the brake mechanism and limits the motion of the
reverse thrust lever and the reverse thrust lever moves enough
to operate switches to command the thrust reverser
deployment. When the EEC energizes the reverse thrust
interlock solenoid, the latch disengages. This permits the
motion of the reverse thrust lever towards the full reverse thrust
position.
Functional Description
Each solenoid connects to both channels of the EEC. The EEC
receives the T/R translating sleeves position data from the
LVDT of each sleeve. When both sleeves are at more than 60%
of deploy, the EEC energizes the solenoid. The solenoid retracts
the interlock latch. The reverse thrust lever can now move past
the deploy position so reverse thrust can increase.
ENGINE CONTROLS - REVERSE THRUST INTERLOCK SOLENOIDS
EFFECTIVITY
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ENGINE CONTROLS - REVERSE THRUST INTERLOCK SOLENOIDS
ENGINE CONTROLS - REVERSE THRUST INTERLOCK SOLENOIDS
EFFECTIVITY
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