(f)
Data retrieval, like BITE test, can only be performed when both N1 values are below 10%.
(g)
The following tables provide labels and other information for interrogation of the EIS primary display Exceedance/Abnormal Start data on an ARINC 429 bus reader.
~..................................................................... | | | |SIGNI-| | SDI | SSM | |PARAMETER|OCTAL| RANGE |FICANT|RESOLUTION......................... | |LABEL| | BITS |(APPROX.) | 10 | 9 | 31 | 30 | 29 | .......................................................................
| N1 (L) | 346 | 256% | 13 | 0.03% | 0 | 1 | 1 | 1 | 0 |
| N1 (R) | 346 | 256% | 13 | 0.03% | 1 | 0 | 1 | 1 | 0 |
| N2 (L) | 344 | 256% | 13 | 0.03% | 0 | 1 | 1 | 1 | 0 |
| N2 (R) | 344 | 256% | 13 | 0.03% | 1 | 0 | 1 | 1 | 0 |
| EGT (L) | 345 | 2048 °C | 12 | 0.5 °C | 0 | 1 | 1 | 1 | 0 |
| EGT (R) | 345 | 2048 °C | 12 | 0.5 °C | 1 | 0 | 1 | 1 | 0 |
| FF (L) | 347 | 32768 PPH | 12 | 8 PPH | 0 | 1 | 1 | 1 | 0 |
| FF (R) | 347 | 32768 PPH | 12 | 8 PPH | 1 | 0 | 1 | 1 | 0 |
2.........….....…...........…......…..........…....…...…....…....…....1
Exceedance and Abnormal Start Mode
__________________________________
Bit 15 set to 1 (binary) Exceedance read-out
Bit 14 set to 1 (binary) Exceedance start
Bit 13 set to 1 (binary) Exceedance stop
Bit 12 Air/Ground Exceedance/Abnormal Start
Air = 1 (binary) Ground = 0 (binary) Bit 11 set to 1 (binary) Abnormal Start
Where SDI means source/destination identifier, SSM means sign status matrix, and (L) equals engine 1 and (R) equals engine 2. The following table further defines status bits 30 and 31:
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
~........................................................ | STATUS BITS | | | ............... CONDITION | DATA | | 31 | 30 | | | .......................................................... | 1 | 1 | VALID (Normal) | NORMAL | | 1 | 0 | BITE (Functionaltest) | BITE Values | | 0 | 1 | Open Circuit Input (NCD) | Zero | | 0 | 0 | Internal Fault (Data Fail) | Zero | 2......…......…............................….............1
NOTE: EGT parameters are limited to positive values.
____
(16) Internal Switch
(a)
The Primary Display has the internal switches for each engine which will enable a signal to be transmitted to N1 low idle warning system and the N2 starter disengage circuit.
(b)
N1 Low Idle Switch
1) The N1 low idle switch will close at decreasing N1 input value of 24.5 |0.1% and remain closed below this value. With an increasing N1 input value of 25.5 |0.1%, the switch will open and remain open. Once closed the switches will not open and reclose in less than one second.
(c)
N2 Starter Cutout Switch
1) The N2 starter cutout switch closes at a decreasing N2 input value of 30.4 |0.7% and remains closed below this value. With an increasing N2 input value of 46.3 |0.7% the switches will open and remain open. Once open, the switch remains open for all N2 values above 30.4 |0.7%. Once closed, the switch remains closed for all N2 values below
46.3 |0.7%.
B. Secondary Display (Fig. 5)
(1)
The EIS Secondary Display comprises two channels (left and right channels) both having independent but identical computing and signal conditioning elements.
(2)
The EIS Secondary Display is powered by 28v dc supplied from the P6-2 panel. There are six internal power supplies, one receives power from EIS SEC 1 circuit breaker for the left channel, one receives power from EIS SEC 3 circuit breaker for the right channel. The other four receive a separate 28v ac (from circuit breakers EIS SEC 2, EIS SEC 4 , EIS SEC 5, and EIS SEC 6 on P6-2 panel), which is supplied as a demodulation reference for engine oil temperature, engine oil pressure, and hydraulic oil pressure.
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