Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
196 words
An auxiliary power unit testing device for testing aircraft auxiliary power units having an operator directed control station connected, by a first multiwire electrical cable having at least one multipin connector, to an electronic sequencing control unit, ESCU, which is connected, by a second multiwire electrical cable having at least one multipin connector, to at least one set of compressor and generating equipment comprising line replaceable units, LRU's, said testing device comprising: A) a APU testing case, B) an open-short circuit testing means contained in said testing case for testing for open and short circuits in LRU electrical circuits by subjecting said LRU electrical circuits with short electrical pulses and detecting the resulting flowing current, C) an electrical cabling means extending from said testing case for electrically imposing said open short-circuit testing means in between said operator directed control station and said ESCU and in between said ESCU and said LRU's, and D) a selector means located on said testing case for selecting electrical circuits for electrical monitoring, said selector means comprising: 1) at least one selector switch and 2) at least one test jack means for connecting electrical monitoring equipment such as voltmeters and oscilloscopes.
Claim 2
Dependent Claim
196 words
An auxiliary power unit testing device for testing aircraft auxiliary power units having an operator directed control station connected, by a first multiwire electrical cable having at least one multipin connector, to an electronic sequencing control unit, ESCU, which is connected, by a second multiwire electrical cable having at least one multipin connector, to at least one set of compressor and generating equipment comprising line replaceable units, LRU's, said testing device comprising: A) a APU testing case, B) an open-short circuit testing means contained in said testing case for testing for open and short circuits in LRU electrical circuits by subjecting said LRU electrical circuits with short electrical pulses and detecting the resulting flowing current, C) an electrical cabling means extending from said testing case for electrically imposing said open short-circuit testing means in between said operator directed control station and said ESCU and in between said ESCU and said LRU's, and D) a selector means located on said testing case for selecting electrical circuits for electrical monitoring, said selector means comprising: 1) at least one selector switch and 2) at least one test jack means for connecting electrical monitoring equipment such as voltmeters and oscilloscopes.
Claim 3
Dependent Claim
21 words
A testing device as in claim 1 wherein said open-short circuit testing means comprises a pulse generator and two current comparators.
Claim 4
Dependent Claim
40 words
A testing device as in claim 1 and further comprising a plurality of signal buffer circuit means and a plurality of signal latch control circuit means for providing a record indicating if electrical signals are transmitted to line replaceable units.
Claim 5
Dependent Claim
19 words
A testing device as in claim 3 wherein said record is in the form of a plurality of lights.
Claim 6
Dependent Claim
16 words
A testing device as in claim 4 wherein said plurality of lights are light emitting diodes.
Claim 7
Dependent Claim
15 words
A testing device as in claim 4 wherein said plurality of lights are incandescent lamps.
Claim 8
Dependent Claim
35 words
A testing device as in claim 1 wherein said electrical cabling means provide a connection with a battery source in said auxiliary power units in order to provide power for operation of said testing device.