Instruments; General Description; Instrument System Maintenance - Thrush Aircraft S2R–T660 Maintenance Manual

THRUSH AIRCRAFT INC - T660 TURBO THRUSH
AIRCRAFT MAINTENANCE MANUAL

INSTRUMENTS

SECTION EIGHT

GENERAL DESCRIPTION

The standard instruments are located on three panels in the cockpit. An upper panel, a left lower panel, and a
right lower panel. The left lower panel contains a clock, oil temperature gauge, oil pressure gauge, fuel
pressure gauge, air filter Delta "P" gauge, hour meter, airframe related electrical switches and fuel quantity
gauge. The right lower panel contains the voltmeter, ammeter, and circuit breakers. The upper instrument
panel contains the gas generator percent tachometer (Ng), propeller tachometer (Np), torque pressure gauge,
ITT (T5) indicator, boom pressure gauge, air speed indicator, altimeter, fluid compass, engine warning lights,
stall warning light and bank indicator. All instruments are lighted with a post light or internally lighted and
controlled with rheostats located on the left lower panel.
Optional instruments and gauges are available upon request. A few of the optional instruments are hopper
™ ™ ™
quantity, Shadin Miniflo fuel flow, Micronair chemical flow meter, Crophawk chemical flow meter, encoding
alt., artificial horizon, electric turn and bank, vertical speed, and directional gyro.

INSTRUMENT SYSTEM MAINTENANCE

Unless otherwise specified, field maintenance of instrument systems is limited to removal and replacement of
defective instruments and transmitters; authorized in-service adjustment of transmitters and instruments; and
repair of instrument systems between the instrument and signal source (transducer). Reliability of the various
instruments and related systems can be sustained by routine inspection of electrical wiring for chafing, and
electrical connections for security. All fluid pressure, pitot pressure, and static line connections must be tight at
all times and lines must be correctly routed and secured. Electrical wiring must be free from chafing, properly
connected and secured. Instrument ports and lines disconnected during system maintenance must be capped
or plugged immediately to prevent the entrance of foreign material and consequent instrument malfunction.
Maintenance procedures pertaining to a specific instrument or system are contained in subsequent
paragraphs. As a general rule, it is recommended that the instrument signal source and means of transmission to
the instrument be rung out before changing an instrument. If a new instrument or a transducer is available, it may
be expedient to utilize them in the system as required to determine if the malfunction is in the instrument, signal
source or interconnecting line.
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Effective: 12/17/03