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 E.  An EICAS advisory and status message ENG-# START VLV will show, after a 5 second delay, when corresponding start valve position disagrees with the commanded position of the engine START switch.
 NOTE: "ENG-#" denotes engine 1, 2, 3, or 4.
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 4.  Starter QAD Adapter___________________
 A.  The starter QAD adapter housing is attached to the main gearbox and has an index pin to make sure correct installation of the starter. The starter is attached to the starter QAD adapter housing with a QAD clamp.
 5.  Autostart System________________
 A.  The autostart system, also is a backup power source for the EEC, is a function of the Supplemental Control Unit (SCU). For more data on the SCU, refer to 73-21-00, Engine Fuel and Control - Description and Operation.
 B.  The SCU supplies automatic engine start on the ground and in the air. The autostart controller in the SCU will take corrective action for all starting faults which occur.
 (1)  The autostart controller response for faults which occur during ground starts are as follows:
 ~................................................................. |STARTING |SYMPTOM SEEN BY | | |ANOMALY |AUTOSTART CONTROLLER|AUTOSTART CONTROLLER RESPONSE | ................................................................... |Hot Start |EGT more than 535°C |Stops fuel supply and ignition.| |No Light |EGT increase <28°C |Motors the engine for 30 | | | after 20 seconds |seconds, then starts fuel | | | |supply and ignition (using both| | | |ignitors). If N2>50% (starter | | | |cutout speed), the controller | | | |stops the start procedure. | ...................................................................
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
|N2<16% after|Poor cranking system|Stops the start procedure. | | 20 seconds | health | | |Hung Start |N2 increase <0.2% in| | | | 10 second intervals| | |Locked Low |N2>40% and N1<6% | | | (N1) Rotor | | | ................................................................... |Starter Duty| |Closes start valve after 5 | |Cycle Time | |minutes and stops the start | |Exceeded | |procedure. | 2............…....................…...............................1
 (2)  The autostart controller response for anomalies which occur during in-flight starts are as follows:
 ~................................................................. |STARTING |SYMPTOM SEEN BY | | |ANOMALY |AUTOSTART CONTROLLER|AUTOSTART CONTROLLER RESPONSE | ................................................................... |Surge |EGT too high for |Cycles fuel supply from "off" | | | given N2 |(for 2 seconds) to "on" (for | | | |12 seconds) until EGT decreases| | | |below the surge detect limit or| | | |until 119 seconds elapse. | ................................................................... |Hot Start |EGT exceeds 625°C |Stops fuel supply and ignition.| | | |Motors the engine for 30 | | | |seconds, then starts fuel | | | |supply and ignition (using both| | | |ignitors). If N2>50% (starter | | | |cutout speed), the controller | | | |attempts a windmill start. | ................................................................... |N2>16% after|Poor cranking system|Continues to try until the | | 20 sec | health |start is completed or until the| |No Light |EGT rise <28°C after|pilot stops the attempt. | | | 20 sec | | |Hung Start |N2 rise <0.2% in 10 | | | |second intervals | | 2............…....................…...............................1
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
C.  When the SCU finds a starting anomaly, the SCU sends fault messages to the flight deck.
 (1)  
When the autostart sequence starts the SCU first makes sure of the input from the EEC data bus. If the SCU does not get the input from the EEC data bus in a specified time limit, the SCU will stop the autostart sequence, and will send an "ENG 1 (2,3, or 4) AUTOSTART" EICAS message to the flight deck.
　
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