Table 1-2.--Troubleshooting Wheel Brake System
Probable Cause
Isolation Procedure
Remedy
Brake accumulator does not become charged
Brake accumulator charge
Check that pressure gauge reads 800 psi.
Charge brake accumulator.
pressure low
Pressure gauge
Replace pressure gauge with one known to
If trouble is corrected,
operate properly. (Refer to WP084 00.)
discard defective gauge.
Brake selector-valve rigging
Check selector-valve rigging. (Refer to
Rig selector valve.
WP082 00.)
.....
Brake accumulator
Replace accumulator with one known to
operate properly. (Refer to WP083 00.)
.....
Brake cycles gauge
Replace gauge with one known to operate
properly. (Refer to WP086 00.)
.....
Thermal relief valve
Replace relief valve with one known to
operate properly. (Refer to WP087 00.)
trouble analysis sheets is shown in tables 1-2 and 1-3.
Table 1-3.--Troubleshooting Emergency/Parking Brake System
The sheets used with the checkout procedures relate to
checkout procedures by direct reference or to dis-
crepancies occurring in flight or during ground opera-
tions. Each table provides a remedy for each symptom.
When the remedy is as simple as replacing a
component or making an adjustment, this fact is so
stated. When the remedy requires further analysis, the
entry in the REMEDY column will be a reference to an
applicable paragraph, figure, or possibly another
manual. See tables 1-1 and 1-2.
Each trouble analysis procedure provides
preliminary data, such as tools and equipment,
manpower requirements, and material. In the block
type of troubleshooting sheets, the procedure is
arranged in the order of most likely occurrence. The
sheet contains a NO-YES response to direct
maintenance personnel through a logical series of steps.
These directed responses assist in isolating the
malfunction. When the requirements of a step are
satisfactory, you go to the YES column and perform the
referenced step. When the requirements of a step are
not satisfactory, you go to the NO column and perform
the referenced step. This method is continued until the
malfunction is isolated and corrected. The original
checkout procedure must then be repeated to ensure
that the malfunction has been corrected.
TROUBLESHOOTING PROCEDURES
Troubleshooting procedures are similar in
practically all applications, whether they are
mechanical, hydraulic, pneumatic, or electrical. These
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