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back-up rings, and fitting threads with hydraulic fluid
before assembly.
When assembling hydraulic system fittings, be sure
that seals and back-up rings are properly positioned
before torquing the connection.
When installing an elbow fitting into a component, be
sure that all the threads are completely screwed into
the boss. This is to make sure that the O-ring packing
rides in the undercut, and not on the threads.
To prevent an elbow fitting from turning while its
lock-nut is being torqued, hold it with a second
wrench.
To make a stress-free installation, be sure that all
elbow-to-pipe connections are correctly aligned before
torquing the B-nuts.
Do not use pointed, sharp-edged, or steel tools to
remove or install O-ring packing, back-up rings, and
seals. Damage may occur.
Never reinstall used O-ring packing or seals. Once
they have been compressed, they will never regain their
original shape again.
Before torquing a B-nut, be sure that the tube fits
squarely into the fitting. Never force or bend a tube
to make it fit. Metal tubes dont stretch. If the piece
seems shorter upon reinstallation or after a component
change, something is wrong. Stop ! Think ! And
investigate the problem before you proceed.
Make sure that tubes are not forced into clamps or
line blocks. A stressed installation will lead to a
cracked tube at the nearest fitting or B-nut. And, you
can bet it wont be long before it happens.
If clamps or line blocks are removed so a tube or
component can be replaced, be sure that they are
reinstalled again. Tubes that are not properly
supported will vibrate. Vibration is the greatest enemy
of a hydraulic system.
It causes tubes to crack, and connections at fittings
to loosen up and leak.
When repairs are finished, always bleed the system,
and leak check your work.
We, the mechanics, have control of torquing. The lack
of proper torquing is the single greatest cause of
leaks. Those calibrated elbows are notorious for being
out of calibration. Use a torque wrench.
TMUGENF01-T01 LEVEL 1
EFFECTIVITY 29-00-00 Page 2
Oct 31/98
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 29 HYDRAULIC POWER
UF94200
EFFECTIVITY Page 220
ALL
29 - HYDRAULIC SYSTEM
29-00-00 CFDS SPECIFIC PAGE PRESENTATION
CONTENTS:
-General
-Auto Flight System (AFS)
-Flight Controls (F/CTL)
-Instruments (INST)
-Landing Gear (L/G)
TMUHYDQ02 LEVEL 3
EFFECTIVITY 29-00-00 Page 1
Aug 31/99
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 29 HYDRAULIC POWER
UF94200
EFFECTIVITY Page 221
ALL
CFDS SPECIFIC PAGE PRESENTATION
GENERAL
The CFDS SYSTEM REPORT/TEST menu does not include the
hydraulic menu page.
The purpose of this module is to present the access
to the LAST LEG REPORT of the Auto Flight, Flight
Controls, Instrument and Landing Gear systems, in case
of failure of certain hydraulic components.
The hydraulic system components monitored by the AFS,
the F/CTL, the INST and the L/G systems are :
- the pressure switches
- the pressure transmitters
- the temperature transmitters
- the quantity indicators.
AUTO FLIGHT SYSTEM (AFS)
The green pressure switch 1151GN sends a signal to the
Flight Augmentation Computer 1 (FAC1) and the yellow
pressure switch 3151GN sends a signal to FAC2.
TMUHYDQ02-T01 LEVEL 3
EFFECTIVITY 29-00-00 Page 2
Aug 31/99
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 29 HYDRAULIC POWER
UF94200
EFFECTIVITY Page 222
ALL
CFDS SPECIFIC PAGE PRESENTATION (AUTO FLIGHT SYSTEM)
TMUHYDQ02-P01 LEVEL 3
EFFECTIVITY 29-00-00 Page 3
Aug 31/99
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 29 HYDRAULIC POWER
UF94200
EFFECTIVITY Page 223
ALL
CFDS SPECIFIC PAGE PRESENTATION
FLIGHT CONTROLS (F/CTL)
The blue, yellow and green HP manifold pressure
switches (2151GN-3151GN-1151GN) send a signal to the
Elevator Aileron Computers (ELACs) and to the Spoiler
Elevator Computers (SECs).
The pressure switches (10CE2-10CE3-10CE1) belonging
to the Flight Control System send a signal to ELACs
and SECs.
The blue, yellow and green HP manifold pressure
transmitters (2065GN-3065GN-1065GN) send a signal to
the ELACs.
TMUHYDQ02-T02 LEVEL 3
EFFECTIVITY 29-00-00 Page 4
Aug 31/99
_A319/A320/A321 TECHNICAL TRAINING MANUAL
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