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US 4,475,196 AGranted
Instrument for locating faults in aircraft passenger reading light and attendant call control system
OwnerClair G. La Zorinventor
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OwnerClair G. La Zorinventor
Estimating the term…
A testing instrument is especially adapted for use in locating faults in the passenger reading light and flight attendant call control systems which are used in jumbo jetliners. The testing instrument includes a selection means for designating one of a plurality of series connected passenger locations. Each passenger location includes a proximately located group of two or three passenger seats. The instrument includes indicators for registering data transmitted from the passenger location to a section timer that controls input from and output to passenger locations in an aircraft cabin on a timed, multiplexed basis. The instrument also monitors transmission of data from the section timer to the selected passenger location and includes detectors for registering faults in timing and parity pulses. The instrument includes test controls to create particular conditions of the reading light and attendant call controls, and also a meter for detecting abnormalities in voltage drops at each of the serially connected passenger locations.
An instrument for locating malfunctions in a multiplexed aircraft passenger reading light and attendant call control system having a plurality of passenger locations and a section timer coupled to sequentially address said passenger locations by passing electrically encoded data to and from a seat encoder with reading light switches and an overhead decoder with reading lights located thereat, at each passenger location comprising:
In an instrument for locating malfunctions in a multiplexed aircraft passenger reading light and attendant call control system having a plurality of passenger locations controlled by a section timer for sequentially addressing said passenger locations by passing electrically encoded data to and from a seat encoder with reading light switches and attendant call switches and an overhead decoder with reading lights located thereat, at each passenger location and the seat encoders of at least some of said passenger locations are connected with the seat encoders thereof arranged in a seat encoder loop that includes a forward data line which leads from said section timer and serially connects said seat encoders and a backward data line that provides a signal path from the last of said serially connected seat encoders to said section timer, and the overhead decoders at said same passenger locations are serially connected in an overhead decoder loop, in correspondence to said seat encoder loop, in a forward data line which leads from said section timer through said serially connected overhead decoders and a backward data line that provides a signal path from the last of said serially connected overhead decoders to said section timer, connection means which couple said seat encoders and said overhead decoders to said section timer, to receive electrically encoded data from said seat encoders and to transmit electrically encoded data to said seat encoders and to said overhead decoders, and said section timer includes alternating means for cyclically coupling said section timer to the forward data lines of said data loops and alternatingly to the backward data lines of said data loops, the improvement comprising a switching means for suppressing said alternating means in said section timer and for selectively confining addressing by said section timer to said forward data lines and alternatively to said backward data lines.
Dependencies are inferred from the claim text.