TM 55-1520-240-T118-1.3 GLOBAL POSITIONING SYSTEM VISUAL CHECK (Continued)18-1.313.Set the GPS CDU Data switch (10) to STAT. Liftswitch guard and toggle the Zeroize switch (17).14.Set the GPS CDU DATA switch (10) to STAT.Insert a Data Loader Module which containsalmanac information into the Data LoaderReceptacle (19) located on shelf five of the cabinavionic/electronic compartment. Leave in for atleast 20 seconds, then remove Data LoaderModule.15.With the GPS CDU Data switch (10) still at STAT,slew (11) down to page 2 and compare theAlmanac Age located on display (6) line 2 with theage recorded earlier in step 7.16.Turn the GPS CDU Mode switch (7) to OFF.Leave OFF for a few minutes then turn back ONwith the Mode switch (7) in the NAV position.17. Stop APU. Refer to task 15-1.4.FOLLOW-ON MAINTENANCE:TM 55-1520-240-23:Battery DisconnectedElectrical Power OffThe CDU data display (6), line 2 shall displayZEROED. If ZERO FAIL is displayed, go to task181.12.No error messages shall be displayed on the CDUdata display (6). If an error message is displayed, goto task 18-1.6.The two values shall be different if the Almanacstored in the Data Loader Module has beensuccessfully loaded into the GPS system. If theAlmanac Age is the same as before loading data withthe Data Module, go to task 18-1.8.After warmup and test completion, GNAV shallappear on CDU data display (6) line 1. This meansthat the previously loaded almanac has been storedby the GPS receiver (9). If COLD appears on CDUdata display (6) line 1 instead, go to task 18-1.13.GO TO NEXT PAGE18-16 Change 18
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