-
normal logic off, complementary logic on.
These signals let the LGCIUs supply two different types of output signal to
other aircraft systems. The two types of signal are:
-ARINC 429 data transmissions
-discrete (transistor) signals.
The normal and the complementary signals are used by the LGCIUs to supply
the ARINC 429 data transmissions. An internal microprocessor controls the
data transmissions, which are then supplied on three data buses.
The LGCIU uses only the complementary signals to supply the discrete output
signals. These discrete output signals are switched by two types of
transistor.
These are:
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Landing-Gear Position Information - Schematic
Figure 001 (SHEET 1)
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Landing-Gear Position Information - Schematic
Figure 001 (SHEET 2)
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-
transistors that change the signal to 28Vdc for ON
-
transistors that change the signal to ground for ON.
The ARINC 429 and the discrete output signals supply the same information.
Thus two signals are available where necessary.
The LGCIU supplies the signals to the other aircraft systems when the L/G is
in these positions:
-
L/G compressed - Nose, LH, RH, (LH & RH)
-
L/G extended - Nose, LH, RH, (LH & RH)
-
L/G downlocked - Nose, LH, RH, (LH & RH)
-
L/G Uplock unlocked - Nose.
Each LGCIU controls a L/G position-relay:
-
LGCIU (5GA1) controls relay 11GB
-
LGCIU (5GA2) controls relay 12GB.
Some of the relay switch contacts (which are not used in the L/G control circuits) are used to control other aircraft systems. The relays are energized when the two legs of the MLG are compressed.
The L/G control lever has two switch contacts which are not used for L/G control. These switch contacts (1 UP/1 DOWN) are used to control other aircraft systems.
4. Power Supply
____________
(Ref. Fig. 001)
R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 401-499,
The LGCIUs are supplied with electrical power through circuit breakers 1GA, 2GA, and 52GA as follows:
-
LGCIU 1 by 1GA and 52GA
-
LGCIU 2 by 2GA.
**ON A/C ALL
5. Interface
_________
The tables that follow show the aircraft systems that receive L/G position
signals from the No.1 and/or the No.2 system LGCIU(s).
The information contained in the tables is as follows:
-TABLE TITLE, the landing gear position
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-LGCIU No.1/No.2, source of the output signal and the L/G used to cause an output signal, L = LH main L/G R = RH main L/G M = LH & RH main L/G N = Nose L/G
-SIG, type of output signal, A = transistors that change the signal to 28V D.C. for on B = transistors that change the signal to ground for on B*= transistors that change the signal to ground for on with an additional ground connector. These circuits are kept in an aircraft-on-the-ground condition when ground power is supplied to the aircraft SC= special case transistor, this transistor conducts to 28V when on. It is kept in an aircraft-on-the-ground condition when ground power is supplied or when the nose landing gear is compressed
-020/021 = ARINC 429 data labels
-SI, system identification of electrical circuits.
-ATA, controlled system's ATA function
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