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 E.  When you do a BITE test, the EIS does a test of different circuits. If a test is successful, the applicable LCD pointer and digital display will move from minimum to maximum value. The over limit lights will come on when the displays exceed the limit values. After the maximum value is reached, the displays will move to a set value until you release the test switch. The EIS will show digital fault codes if a failure is found. When you release the test switch, the displays will go back to their pretest values.
 F.  If a BITE test failure occurs in the EIS Primary Display, a fault code will be shown on the digital display of the failed engine parameter(s) during the BITE sequence.
 G.  If a BITE test failure occurs in the EIS Secondary Display, a fault code will be shown on engine oil quantity (OIL QTY) digital counters during the BITE sequence.
 H.  The Abnormal Start Advisory is indicated by the flashing of the EGT gage digital counter on the primary display. The EGT gage digital counter flashes two times per second to indicate conditions that may lead to an abnormal engine start. If an Abnormal Start Advisory occurs, you must continue to monitor other engine indications and abort the start if necessary.
 2.  EIS Primary Display and Secondary Display Tests_______________________________________________
 A.  Do a BITE test per 31-42-00/501, Engine Instrument System -Adjustment/Test on:

 EIS Primary Display
 EIS Secondary Display

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH EIS ú

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A 737-300/400/500MAINTENANCE MANUAL
 ~.................................................................... | CAUSE | FAILURE INDICATION | ...................................................................... | Input power below 18v dc | All displays blank during undervoltage | | or loss of power for less | condition and reappear at their pre-| | than 2 seconds | undervoltage condition when power is | | | reapplied and reaches 18v dc or more. | ...................................................................... | Input power below 18v dc | All displays blank and 1 second after | | or loss of power for more | power is reapplied and reaches 18v dc | | than 2 seconds | or more all displays reappear at their | | | minimum value and slew up to their pre-| | | undervoltage value. | ...................................................................... | Loss of analog signal | The affected display(s) move to the | | i.e. open circuit input | lowest position, wait for 2 seconds, | | | and blank if a pointer and show dashes | | | if a counter. | ...................................................................... | Short to ground of analog | The affected display(s) move to the | | high signals | lowest position, wait for 2 seconds, | | (For Eng. Oil Press, Oil | and blank if a pointer and show dashes | | Temp, Oil Qty, and Vib) | if a counter. | ......................................................................
 | Loss of digital input  | Dashes show across the display  |
 | data validity  | horizontal centerline.  |
 | (SSM=01 and illegal  |  |
 |  message combination)  |  |

 ...................................................................... | Incorrect parity of | The TMA or TAT display blanks. | | digital input data or | | | loss of digital input | | ...................................................................... | SSM set to 11 (TMA only) | The TMA display blanks. | ...................................................................... | SSM set to no computed | The TAT display shows dashes. | | data | | ...................................................................... | SSM set Data Fail | The TAT display blanks. | 2...........................…........................................1
 Table A: EIS Failure Indication

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 ENGINE INSTRUMENT SYSTEM - MAINTENANCE PRACTICES
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