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UF94200
EFFECTIVITY Page 306
ALL
TMUFCTC02-P03 LEVEL 3
SLATS/FLAPS ABNORMAL OPERATION (LOCKING) - UNCOMMANDED MOVEMENT
EFFECTIVITY
ALL 27-00-00 Page 7
May 31/00
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 27 FLIGHT CONTROLS
UF94200
EFFECTIVITY Page 307
ALL
SLATS/FLAPS ABNORMAL OPERATION (LOCKING)
FAILURE MONITORING
The Power Control Unit (PCU) is in operation.
The extend solenoid valve and the pressure off brake
solenoid valve are energized and the flaps extend.
Position Pick-off Unit information is used for system
monitoring.
Asymmetry is detected by SFCC1.
Once asymmetry has been detected by an SFCC, its
associated valve block is de-energized.
A "WTB arm" signal is sent to the SFCC2 flap channel
to check whether asymmetry is confirmed or not.
If the asymmetry is confirmed by SFCC2, a "WTB arm"
signal is sent to the WTB solenoids, PCUs are
de-energized and the software latched (reset on ground
only via the CFDS).
If asymmetry is not confirmed by the second computer,
the first system is considered faulty.
TMUFCTC02-T04 LEVEL 3
EFFECTIVITY
ALL 27-00-00 Page 8
May 31/00
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 27 FLIGHT CONTROLS
UF94200
EFFECTIVITY Page 308
ALL
TMUFCTC02-P04 LEVEL 3
SLATS/FLAPS ABNORMAL OPERATION (LOCKING) - FAILURE MONITORING
EFFECTIVITY
ALL 27-00-00 Page 9
May 31/00
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 27 FLIGHT CONTROLS
UF94200
EFFECTIVITY Page 309
ALL
SELF EXAMINATION
Which type of failure is detected with a position
difference between both APPUs ?
A - An asymmetry.
B - An overspeed.
C - A runaway.
Once the WTBs have been applied, is it possible to
reset them in flight ?
A - Yes, by making any new selection with
the control lever.
B - Yes, by making a reverse selection with
the control lever.
C - No, reset is possible on ground only.
How can a flap runaway be detected ?
A - By comparison between the SFCC commands
and the Asymmetry PPU signals.
B - By comparison between the SFCC commands
and the Feedback PPU signals.
C - By comparison between Asymmetry PPU and
Feedback PPU signals.
TMUFCTC02 LEVEL 3
EFFECTIVITY
ALL 27-00-00 Page 10
May 31/00
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 27 FLIGHT CONTROLS
UF94200
EFFECTIVITY Page 310
ALL
27 - FLIGHT CONTROLS
27-00-00 SLATS/FLAPS ABNORMAL OPERATION
(HALF SPEED)
CONTENTS:
Presentation
Slat Flap Control Computer (SFCC) Failure
Hydraulic Failure
Spool Valve Jam
Self Examination
TMUFCTD02 LEVEL 3
EFFECTIVITY
ALL 27-00-00 Page 1
May 31/00
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 27 FLIGHT CONTROLS
UF94200
EFFECTIVITY Page 311
ALL
SLATS/FLAPS ABNORMAL OPERATION (HALF SPEED)
PRESENTATION
We will study examples of abnormal operations which
cause the system to operate at half speed. As Slat and
Flap operation is identical, only flaps will be shown.
When half speed is detected, a level 1 caution is
generated and a fault message is displayed on the ECAM.
SLAT AND FLAP CONTROL COMPUTER (SFCC) FAILURE
In this example Slat Flap Control Computer 2 flap
channel is inoperative and Slat Flap Control Computer
1 operates normally.
Each flap channel lane of the SFCC 1, generates command
signals.
The drive commands, generated in the POWER CONTROL
UNIT control input stage, control the related solenoid
valve in the flap Power Control Unit.
Only the related green hydraulic motor is operative.
As valve block 24CV is not energized, the Pressure Off
Brake holds the output shaft of the yellow hydraulic
motor. Due to the reaction of one half of the
differential gearbox, the operative motor provides
full output torque at half speed.
TMUFCTD02-T01 LEVEL 3
EFFECTIVITY
ALL 27-00-00 Page 2
May 31/00
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 27 FLIGHT CONTROLS
UF94200
EFFECTIVITY Page 312
ALL
TMUFCTD02-P01 LEVEL 3
SLATS/FLAPS ABNORMAL OPERATION (HALF SPEED) - SFCC 2 FAILURE
EFFECTIVITY
ALL 27-00-00 Page 3
May 31/00
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 27 FLIGHT CONTROLS
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