747飞机维护手册AMM CHAPTER 34 - NAVIGATION 第34章导航3(43)

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 In addition, the INS stores the coordinates of airplane present position at the time the INS was last shutdown. If a present position is entered upon subsequent turn-on, and this present position differs by more than 3+3T nautical miles (where T is time in NAV mode) from the last present position, the message POS. CHG. EXC; ENT = OVR CLR = RSET appears on lines 4 and 5 of the CDU display. If the newly entered present position is correct (the INU was moved since last turnoff) the new present position can be entered by pressing ENT pushbutton. If the present position is incorrect, press CLR pushbutton, and enter correct present position.
 NOTE: On airplanes with LTN-92 INS,
____ if unreasonable entries of latitude or longitude are attempted (for example latitude entry greater than 90 degrees), the system will reject the entry when ENT is pressed and the invalid data will flash. Press CLR and re-enter correct present position.
 EFFECTIVITY

 AIRPLANES WITH LTN-72RL OR  CONFIG LTN-92 INS  01 Page 503  Apr 25/93

34-41-00
 In addition, the INS stores the coordinates of airplane
 present position at the time the INS was last shutdown. If a
 present position is entered upon subsequent turn-on, and this
 present position differs by more than 1 degree and/or 3+3T
 nautical miles (where T is time in NAV mode) from the last
 present position, the CDU WRN annunciator will flash and the
 message CHECK PPOS ENTRY will be displayed on the POSITION
 page (the STATUS page will display ENTER PPOS). If the newly
 entered present position is correct (the INU was moved since
 last turnoff), the new present position can be entered by
 pressing ENT pushbutton. If the present position is
 incorrect, press CLR pushbutton, and enter correct present
 position.
 (2)  Place mode selector switch on MSU to STBY.
 (3)  Press POS pushbutton on CDU. Verify that POSITION (OR POSITION
 DATA) page with LAT and LON prompt/display lines appears on display
 with LAT line between entry line markers.
 (4)  Press CDU 2N or 8S pushbutton to start latitude entry; N or S
 character replaces <> symbol in LAT prompt/display line and letter N
 appears following the POSITION (OR POSITION DATA) title line.
 Letter N remains while data is being entered and goes out when ENT
 is pressed.
 NOTE: The letter N following the title line in the display after____
 the initial pushbutton is pressed indicates that the display
 is prepared to accept a numerical rather than an alpha entry.
 (5)  Press CDU pushbuttons corresponding to latitude including any
 leading or trailing zeros.
 NOTE: If an invalid latitude is entered, LAT line will flash on and____
 off. Press CLR pushbutton and repeat steps (3) thru (5).
 (6)  If latitude displayed is correct, press ENT pushbutton on CDU.
 Verify that LAT line flashes and display slews up to place LON
 prompt/display line between entry line markers.
 (7)  Press CDU W4 or 6E pushbutton to start longitude entry; W or E
 character replaces <> symbol in LON prompt/display line and letter N
 appears following title line.
 (8)  Press CDU pushbuttons corresponding to longitude, including any
 leading or trailing zeros.
 NOTE: If an invalid longitude is entered, LON line will flash on____
 and off. Press CLR pushbutton and repeat steps (7) and (8).
 (9)  If longitude displayed is correct, press CDU ENT pushbutton. Verify
 that LON line flashes and GMT prompt/display line appears on
 display.

 H. INS/HSI Interface Tests
 EFFECTIVITY
 AIRPLANES WITH LTN-72RL OR  CONFIG LTN-92 INS  01 Page 504  Apr 25/93

34-41-00
 (1)  
On airplanes with LTN-72RL, ensure that present position coordinates are entered into each INS and that mode selector switch on each MSU is set to STBY. On airplanes with LTN-92, ensure that present position coordinates are entered into each INS and that mode selector switch on each MSU is set to STBY or ALIGN.

 (2)  
Place mode selector switch on each MSU to ALIGN.

 (3)  
Press STS pushbutton on each CDU. Verify that SYS STS/TEST page appears on each CDU display, with ALIGN between entry line markers. The number on ALIGN line is status number.

 (4)  
On airplanes with LTN-72RL INS, observe each INS aligns to status 40 or a lower number.

 (5)  
Slew each CDU display up until SYSTEM TEST page appears on each display.
　
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