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Embraer E-Jet speed brakes for steep glideslopes

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Embraer E-Jet speed brakes for steep glideslopes

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Old 10th Jul 2014, 20:50
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Embraer E-Jet speed brakes for steep glideslopes

Do any E-Jets that approved to operate in short fields with steep glideslopes like London City have the speed brake protection system override?

According to FCOM:
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If extended during approach, the speed brakes will automatically retract upon selection of slap/flap 2 or above.
Speed brakes will not be deployed if airspeed is below 180 KIAS, and also automatically retract if airspeed decreases below this threshold.
--

Lufthansa City Line guys somehow make the approaches with the speed brakes partially deployed in Flap Full conf.
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Old 10th Jul 2014, 21:01
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That's part of the steel g/s option offered on the -170/190, I presume Lufty ordered that option.
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Old 11th Jul 2014, 14:10
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With the steep approach option there is a new mode for the Multi function spoilers that effectively gives a final approach similar to the old direct lift control on the L1011. In fact one might assume they copied that idea after abandoning their original ventral airbrake concept ;-)
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Old 11th Jul 2014, 14:49
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The spoilers deploy, and are controlled automatically during a steep approach.

The spoiler lever stays in the closed position.

If it wasn't for the spoiler deployment, the a/c would probably do the approach at flight idle, with possible spool up problems on the go around.

Not that you'd ever have to go around somewhere like London City mind.....
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