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 C.  When all INS are operating properly, slight display variations between systems will normally be observed. This is caused by such factors as gyro drift rate variations, temperature changes and mechanical friction. Each INS produces an output voltage to indicate an INS position-comparison-warning when radial distances between the computed present position of one INS and the computed present position of the other two INS exceeded a specified distance. This distance is based on time in NAV mode and varies linearly from approximately 5 miles after 1 hour to approximately 49 miles after 10 hours in the NAV mode.
 D.  The operation of the WARN lamp indicates that a critical malfunction exists. If the WARN lamp lights during the operational test, the malfunction code analysis procedure (paragraph 3) must be performed. Performing this procedure will allow the particular malfunction to be identified and corrective action taken. The existance of noncritical malfunctions is also noted in the procedure. The malfunction code analysis procedure lists the malfunction code, pilots' action code, and recommended maintenance action. After performing the malfunction code analysis, the step at which the malfunction was encountered should be repeated before completing the simplified operational test procedure.

　
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本文鏈接地址：747飛機維護手冊AMM CHAPTER 34 - NAVIGATION 第34章導航2(141)