Products: Castleberry Model 377-4M Tester
The Model 377-4M Tester is a compact, portable and precise tester, complete with vacuum-pressure pump, valves, hoses, electric cord and monitoring instruments. All components are contained within the fiberglass case, 10 inches high, 15 inches wide and 15 inches deep, weighing 30 pounds.
The 377-4M can be used by one technician for all test procedures right on the aircraft or on the test bench.
The 377-4M produces precise and controlled pressures, pitot and static, that are normally sensed by airborne flight instruments. Through adapter fittings and hose connections, the precise pressures generated by the tester can be applied to the aircraft’s normal pitot and static lines or directly to a specific instrument to check for proper operation.
The 377-4M supplies both positive and negative pressure (vacuum). Self-test of the 377-4M can be made quickly and easily at any time.
Instruments used in the 377-4M are highly accurate and sensitive. These instruments are calibrated and certified to FAA Standards under controlled environmental conditions, thus providing a reliable testing standard.
A dry pump is used in the 377-4M which allows it to be carried, stored or operated in any position without fear of fluid contamination of instruments.
Static and pitot pressures are controlled by micro metering valves adjustable at the front panel. These valves also act as shut-off values to isolate the aircraft systems and the tester instruments from the testers pressure sources. This isolation provides a means of checking for system leakage by observing a drop in the altimeter and/or airspeed instruments in the 377-4M over a period of time.
Electrical circuit wiring is fused using a 3 ampere fuse to prevent electrical damage to the tester.
Test connection plug fittings are provided with a dual purpose, dust caps to prevent contamination within the 377-4M and to seal the outlet connections ports to make pre-test self-checks to the Tester possible.
Hoses and fittings furnished with the 377-4M allow interconnections with the aircraft’s pitot and static ports. Optional adapters and fittings are available on request.
The pump motor operates on 115/110 volts AC, 50/60 cycles or optional 230/220 volts AC 50/60 cycles single phase.
Three precise instruments are used in the typical 377-4M tester. All functions are clearly labeled on the tester’s control panel and instruments dials.
- The airspeed (Pitot pressure monitor) dial is calibrated to read indicated airspeed in knots and/or miles per hour depending on choice.
- The altimeter (static pressure monitor) dial is calibrated to indicate altitude in feet.
- The climb (static pressure rate of change monitor) dial is calibrated to indicate altitude rate of change in fee per minute.
