WES -LANDING CONFIGURATION WARNING INPUTS -1

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WES -LANDING CONFIGURATION WARNING INPUTS -2

Thrust Lever Resolver Angle Input Landing Configuration Warning Test Logic Interface
The electronic engine controls (EECs) supply thrust lever All inputs that the WEUs use for landing configuration warning resolver angle (TLRA) to the WEUs. Compare logic in the WEUs go to the landing configuration warning test logic. make a true output when the TLRA is less than the glideslope power level (GSPL). The WEUs have the GSPL value in memory.
The compare logic also supplies a true output to the speed brake alert logic when the TLRA is greater than the speedbrake power level (SBPL). The WEUs have the SBPL value in memory.
Radio Altitude Input
The AIMS supplies radio altitude to the WEUs. The left WEU uses radio altitude in this priority:
*
Left

*
Right

*
Center.

The right WEU uses radio altitude in this priority:
*
Right

*
left

*
Center.

FSEU Inputs
The flap/slat electronic units (FSEUs) supply a flap lever in landing position digital discrete to the WEUs.
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WES -LANDING CONFIGURATION WARNING INPUTS -2

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WES -LANDING CONFIGURATION WARNING OPERATION

General
The WEUs make a landing configuration warning when the airplane is on approach and the landing gear is not down and locked.
There are two types of landing configuration warnings: resetable and non-resetable. Both types of warnings show the same indications. The indications are:
*
CONFIG GEAR level A message shows on the EICAS primary display.

*
Siren aural comes on

*
Master warning lights come on

Resetable Landing Configuration Warning
During a resetable landing configuration warning, the CONFIG GEAR warning message stays until you lower the landing gear. Push any master warning light to stop the siren aural and to make the warning lights go out. The siren also stops when the ground proximity gear override switch is on.
Non-resetable Landing Configuration Warning
During a non-resetable landing configuration warning, the CONFIG GEAR warning message and the siren aural stay until you lower the landing gear. Push any master warning light to make the warning lights go out. The siren also stops when the ground proximity gear override switch is on.
Landing Configuration Warning Inhibit
The landing configuration warning inhibit prevents false resetable landing configuration warnings. The inhibit starts when the nose gear not compressed signal from the PSEU goes from false to true. The inhibit stops when the airplane goes above 800 feet of radio altitude, or 140 seconds after the nose gear not compressed signal was true.
Total Inhibit
The landing configuration warning function does not operate when the landing gear goes from all gear down and locked to all gears not down and locked (landing gear transition), and the radio altitude is below 800 feet. This is to prevent false warnings when the flight crew aborts a landing below 800 feet of radio altitude.
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WES -LANDING CONFIGURATION WARNING OPERATION

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WES -SPEEDBRAKE ALERT

General
The speedbrake alert function tells the flight crew when it is not safe to extend the speedbrakes.
Conditions Monitored
The WEUs make a speedbrake alert when the speedbrake handle is past the arm position, and any of these conditions is present:
*
Flaps lever in landing position with a radio altitude of 15 feet or more

*
Radio altitude is between 15 and 800 feet

*
15 seconds after any thrust lever resolver angle (TLRA) is more than the speedbrake power level (SBPL) and the radio altitude is 15 feet or more.

Speedbrake Alert Indications
A speedbrake alert has these indications:
*
A SPEEDBRAKE EXTENDED caution message shows on the EICAS display

*
The master caution lights come on

*
A caution aural comes on.

The AIMS shows the caution message and makes the master caution lights come on. The AIMS does this only when at least two WEU channels supply a speedbrake alert digital signal.
　
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