MD Helicopters 369D - Engine Oil Pressure and Torque Gauge Maintenance Procedures; Plenum Wall Fitting Replacement (369 D Helicopters S;N 0003 - 0232)

CSP-HMI-3MD Helicopters, Inc.
MAINTENANCE MANUAL
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95-30-00
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6. Plenum Wall Fitting Replacement (369D
Helicopters S/N 0003 − 0232)
(Ref. Figure 404) Field reports indicate that
breakage and damage to the reducer installed
on the plenum chamber pan fitting has
occurred during normal service or removal and
installation of the engine oil pressure and
torque gauge lines. Installation of new type
fittings is recommended for both the engine
torque gauge and the engine oil pressure
gauge lines, to facilitate removal and installa
tion of the tube assemblies and preclude
possible breakage or failure of the fittings.
(1). Check that all electrical power is OFF.
(2). Remove left forward engine air intake
fairing and left aft bulkhead access
cover in engine compartment.
(3). Open L/H engine compartment access
door.
(4). Disconnect pressure line nuts at
forward and aft sides of both plenum
chamber pan fittings. Cap pressure
lines.
(5). Remove existing fittings (reducers and
unions) from plenum chamber pan.
(6). Install new ASI 2-3XH2BZ-SS-T
fittings at plenum chamber pan.
(7). Uncap lines and connect forward and
aft sections of engine oil pressure gauge
and engine torque gauge lines to new
fittings.
(8). Perform pressure and leak test of both
lines between engine and gauges at 200
psi (1379 kPa).
(9). Bleed and service both lines (Ref.
Engine Oil Pressure and Torque Gauge
Lines Bleeding and Servicing).
(10). Close engine compartment access door.
Reinstall aft bulkhead access cover and
engine air intake fairing.
7. Engine Oil Pressure and Torque Gauge
Maintenance Procedures
(Ref. Sec. 95-00-00, Instrument Replacement,
Instrument Inspection and Instrument Repair)