TM 1-1500-204-23-4
(2) Cleaning. Clean all exposed surfaces
with a cloth moistened in drycleaning solvent, Federal
Specification P-D-680, Type II, and wipe dry with a dry
clean cloth.
(3) Operating procedures. Refer to TM 55-
4920-229-12 for proper operating procedures.
(4) Maintenance. Maintenance of the
Scorsby base is as follows:
NOTE
The oil in gear reducer should
flow slightly when petcock is
opened.
(a) When oil does not flow, add oil,
Federal Specification VV-L-1071, until proper level is
reached.
(b) Lubricate two ball joints which
support head of Scorsby base with grease, MIL-G-
23827.
e. Pitot Static System Tester. The tester is a
portable, self contained vacuum and pressure tester
whose purpose is the testing of aircraft altimeters, rate
of climb indicators, and fuel pressure gauges.
(1)
Inspection.
Inspect
for
defects,
damaged leads, broken connections, and evidence of
leakage.
WARNING
Drycleaning solvent is flammable
and solvent vapors are toxic. Use
P-D-680, Type 11 Solvent in a
well-ventilated area. Keep away
from
open
flames.
Avoid
prolonged solvent contact with
skin.
(2) Cleaning. Clean with a cloth moistened
in drycleaning solvent, Federal Specification P-D-680,
Type II, and wipe dry with a clean cloth.
(3) Operating procedures. Refer to TM 55-
4920-231-14 for proper operating procedures.
(4) Safety practices. Secure all connections
to prevent leakage or loosening due to vibration.
Remove sleeve from pitot tube and secure all
connections to prevent leakage or loosening due to
vibration.
(5) Maintenance. To ensure that the
equipment is ready for operation at all times it must be
inspected systematically so that defects may be
discovered and corrected before they can result in
serious damage or failure. Defects discovered during
operation of unit will be noted for future correction to be
made as soon as operation has ceased, or operation will
be stopped if defect will cause damage to equipment,
should operation be continued. After operation, services
will be performed at intervals based on normal operation
of equipment, reducing interval to compensate for
abnormal
conditions.
Defects
or
unsatisfactory
operation beyond the scope of the operator to correct
must be reported at earliest opportunity. Maintenance
procedures are covered in applicable maintenance
manuals.
f. Jetcal System Tester. A jetcal tester, as shown
in figure 4-6, is a portable instrument made of
aluminum, stainless steel, and plastic. The major
components of the analyzer are the thermocouple, rpm,
Exhaust Gas Temperature (EGT) indicator, resistance,
and insulation check circuits, and the potentiometer,
temperature regulators, meters, switches, and all the
necessary cables, probes, and adapters for performing
all tests. The jetcal tester is used to analyze turbine
engines.
(1) Purpose and uses. The jetcal tester
may be used to:
·
Functionally check the aircraft
EGT system for error without
running
the
engine
or
disconnecting the wiring.
·
Check individual thermocouples
before placement in a parallel
harness.
·
Check each engine thermocouple
in
a
parallel
harness
for
continuity.
·
Check the thermocouples and
parallel harness for accuracy.
·
Check the resistance of the EGT
circuit.
·
Check the insulation of the EGT
circuit for shorts to ground, or for
shorts between leads.
·
Check EGT indicators (either in or
out of the aircraft) for error.
·
Determine engine rpm with an
accuracy of ( 0.1) percent during
engine runup. Added to this is the
checking and troubleshooting of
the aircraft tachometer system.
Change 3 4-7
