b) Verify the following conditions: 1 INS CDU WARN lamp flashing 2 Position INS CDU Display switch to DSR TK STS and observe that
action code 07 is displayed.
NOTE: If neither condition occurs, position MSU switch to OFF, remove Attitude Slew Plug and verify that Pin A is jumpered to Pin U. Reinstall test plug and restart test.
2) Roll angles may be changed while the MSU switch is in the ALIGN position: a) Press HOLD on the INS CDU. Ensure that the button illuminates. b) Enter the roll angle on the INS CDU panel using same method as step
(4)(a)1)a).
c) Press HOLD.
3) Observe that both the ADI and the YDC BITE panel displays a nonzero roll attitude. Observe that ADI displays a nonzero value and the YDC BITE panel displays roll att +/-15° (with a tolerance a 5°).
4) At the conclusion of the simulation, position the MSU switch to OFF and remove the Attitude slew Test plug to restore the system to normal operation.
(b) If dual INS has not been installed 1) Manually tilt the vertical gyro left and observe that the ADI displays a nonzero reading and the YDC BITE panel displays nonzero roll att. 2) Manually tilt the vertical gyro right and observe that the ADI displays a nonzero reading and the YDC BITE panel displays nonzero roll att.
3) At the conclusion of the simulation, return the Captain's VG-1 vertical gyro to its original state prior to the test.
(5) Perform radio altimeter test.
NOTE: Connect the radio altimeter test set to Radio Altimeter #1 and Radio Altimeter #2, if installed.
(a)
If Radio Altimeter #2 is installed, open Radio Altimerter-2 AC circuit breaker.
(b)
Press down arrow on YDC BITE panel until the panel displays a reading for RA 1.
(c)
Using radio altimeter test set, simulate an altitude of 1400 feet. Observe that the panel displays RA1 of 1400 ± 200 feet.
(d)
Decrease simulated altitude to 750 feet. Observe that the YDC BITE panel displays RA 1 of 750 ±200 feet.
NOTE: Steps (e) through (i) apply only for aircraft with a second radio altimeter.
(e)
Press down arrow until the panel displays reading for RA 2.
(f)
Observe that the panels displays RA 2 invalid.
(g)
Close Radio Altimeter-2 circuit breaker.
(h)
Increase simulated altitude to 1400 feet. Observe that the panel displays RA 2 of 1400 ± 200 feet.
(i)
Decrease simulated altitude to 750 feet. Observe that the YDC BITE panel displays RA 2 of 750 ± 200 feet.
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May 01/99 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 22-12-01 Page 507
(6)
Perform radio altimeter flag test.
(a)
Press MENU.
(b)
Press down arrow until DISCRETE I/O? displays on the panel.
(c)
Press YES.
(d)
Press down arrow until the panel displays a reading for RA1 flag.
(e)
Observe that the panel displays RA1 flag = set.
(f)
Open Radio Altimeter 1 circuit breaker. Observe that the YDC BITE panel displays RA1 flag = not set.
(g)
Close Radio Altimeter 1 circuit breaker.
NOTE: Step (h) and (j) apply only for aircraft with a second radio altimeter.
(h)
Open Radio Altimeter 2 circuit breaker.
(i)
Press down arrow. Observe that the YDC BITE panel displays
RA2 flag = not set.
(j)
Close Radio Altimeter 2 circuit breaker. Observe that the YDC BITE panel displays RA2 flag = set.
(k)
Turn off radio altimeter test set.
(7)
Perform air speed test.
(a)
Press MENU. Observe that DISCRETE I/O? is displayed on the panel. Press up arrow and observe that ANALOG I/O? is displayed on the panel.
(b)
Press YES.
(c)
Press down arrow until the YDC BITE panel displays reading for CAS qpot.
(d)
Using air data test set, simulate airspeed of 130 KTS to Air Data Computer #1 (Ref 34-11-0, Adjustment/Test). Observe that the panel displays CAS qpot between -6.4 V and -8.4 V.
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