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MECHANICS / ELECTRICS & AVIONICS COURSE 29 HYDRAULIC POWER
UF94200
EFFECTIVITY Page 215
ALL
RAT TEST
PRECAUTIONS
WARNING: PUT THE SAFETY DEVICES AND THE WARNING NOTICES
IN POSITION BEFORE YOU START A TASK ON OR
NEAR:
- THE FLIGHT CONTROLS
- THE FLIGHT CONTROL SURFACES
- THE LANDING GEAR AND THE RELATED DOORS
- COMPONENTS THAT MOVE
WARNING: MAKE SURE THAT THE TRAVEL RANGES OF THE FLIGHT
CONTROL SURFACES ARE CLEAR BEFORE YOU
PRESSURIZE/DEPRESSURIZE A HYDRAULIC SYSTEM.
WARNING: MAKE SURE THAT THE SAFETY-LOCKS ARE IN
POSITION ON THE LANDING GEAR.
WARNING: MAKE SURE THAT THE RAT TRAVEL RANGE IS CLEAR
BEFORE YOU EXTEND THE RAT.
WARNING: PLACE SAFETY BARRIERS IN POSITION AND FIT THE
RAT PROTECTIVE EQUIPMENT AS PER AMM
PROCEDURE.
WARNING: DO NOT STAND IN FRONT OF OR BESIDE THE RAT
PROPELLER ASSEMBLY DURING THE FUNCTIONAL
TEST.
NOTE: Do not operate the RAT deployment solenoids for
more than 60 sec. You can operate them more than
once, but you must then let them cool down for
30 min.
GROUND CHECKOUT UNIT PRESENTATION
The Ground checkout unit provides a visual indication
of RAT rpm and blue system pressure delivered by the
RAT during a ground check.
A cable provides electrical connection between the RAT
control panel and the connector on the ground check-out
unit.
RAT GROUND TEST MOTOR PRESENTATION
To test the RAT performance on ground, a ground test
motor must be connected to the RAT gearbox.
The RAT ground test motor is driven by a hydraulic
ground cart.
FLOW CONTROL TEST KIT PRESENTATION
To simulate aircraft hydraulic consumers during RAT
ground check, a flow control test kit must be connected
to the blue hydraulic service panel.
The flow control test kit provides visual indication
of blue system flow delivered by the RAT by means of
a flow meter.
The flow is controlled by means of a manual adjustable
flow valve.
TMUHYDU03-T01 LEVEL 3
EFFECTIVITY 29-22-00 Page 2
Jun 30/96
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 29 HYDRAULIC POWER
UF94200
EFFECTIVITY Page 216
ALL
RAT TEST - GROUND CHECK
TMUHYDU03-P01 LEVEL 3
EFFECTIVITY 29-22-00 Page 3
Jun 30/96
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 29 HYDRAULIC POWER
UF94200
EFFECTIVITY Page 217
ALL
RAT TEST
TEST OPERATION (MAIN STEPS)
To functionally check the RAT on ground it is necessary
to:
- manually deploy the RAT from the cockpit,
- connect the ground test motor to the RAT
gearbox,
- connect the ground checkout unit to the RAT
control panel,
- connect the RAT flow control test kit to the
blue ground service panel,
- spin up the RAT to 5000 rpm with flow control
test kit set to 0 l/mn.
- set flow to values given in the Aircraft
Maintenance Manual with RAT running.
- read RAT rpm and RAT delivery pressure.
The RAT operates properly either in normal pump mode
and in anti-stall mode if the recorded values are
within the tolerances given in the Aircraft Maintenance
Manual.
TMUHYDU03-T01 LEVEL 3
EFFECTIVITY 29-22-00 Page 4
Jun 30/96
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 29 HYDRAULIC POWER
UF94200
EFFECTIVITY Page 218
ALL
29 - HYDRAULIC SYSTEM
29-00-00 PREVENTING HYDRAULIC LEAKS
CONTENTS:
Preventing Hydraulic Leaks
TMUGENF01 LEVEL 1
EFFECTIVITY 29-00-00 Page 1
Oct 31/98
_A319/A320/A321 TECHNICAL TRAINING MANUAL
MECHANICS / ELECTRICS & AVIONICS COURSE 29 HYDRAULIC POWER
UF94200
EFFECTIVITY Page 219
ALL
PREVENTING HYDRAULIC LEAKS
PREVENTING HYDRAULIC LEAKS
These simple plumbing problems can also be real hard
to fix if you dont know the basic hydraulic plumbing
rules. If you dont work carefully and follow these
rules, your work may be the cause of the next hydraulic
leak that delays or cancels a flight.
Lets look at these basic hydraulic plumbing rules :
Contamination that gets into a system or collects on
sealing surfaces can cause leaks internal and external.
Hydraulic fluid itself is a contaminant. It can eat
paint and decals. When hydraulic fluid is allowed to
penetrate a composite structure, it will attack the
core material and reduce it to mush.
Once a composite assembly has been attacked, its
structural integrity will be lost.
To avoid damage caused by twisting, tearing, and
chipping, always lubricate O-rings, packing seals,
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