(2)
These are the tests that make up the system test:
(a)
IRU Orientation Test
(b)
Digital Air Data Computer (DADC) Interface Test
(c)
Master Dim And Test
(d)
Five Minute Time Delay Check
(e)
Ground Horn Check Thru IRS
B. References
(1)
AMM 21-58-02/501, EFIS Cooling System
(2)
AMM 21-58-03/501, Equipment Cooling System
(3)
AMM 24-22-00/201, Manual Control
(4)
AMM 34-28-01/201, Inertial Reference System
C. Access
(1)
Location Zones
101/102 Flight Compartment 205 Electronic Compartment
(2)
Access Panel
1201 Electronics Equipment Access Door
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D. Prepare for the Test
S 865-089
(1)
Supply electrical power (AMM 24-22-00/201).
S 865-090
(2)
Supply cool air to the EFIS (AMM 21-58-02/501).
S 865-091
(3)
Supply cool air to the inertial reference units (IRU's)
(AMM 21-58-03/501).
E. IRU Orientation Test
S 865-096
(1)
Set the IRS TRANSFER SWITCH on the P5-28 panel to the NORMAL position.
S 865-053
(2)
Align the IRS if it is not already aligned (AMM 34-28-01/201).
S 735-054
(3)
Do these steps to do the IRU orientation test.
(a) Compare the magnetic heading shown on the captain's EHSI with the magnetic heading shown on the standby magnetic compass. 1) Make sure that the values agree + or - 30 degrees.
NOTE: A magnetic field interference, like a hangar, can
____ cause the values to be different by more than 30 degrees.
(b) Compare the magnetic heading on the first officer's EHSI with the magnetic heading on the standby magnetic compass. 1) Make sure that the values agree + or - 30 degrees.
NOTE: A magnetic field interference, like a hangar, can
____ cause the values to be different by more than 30 degrees.
F. Digital Air Data Computer (DADC) Interface Test
S 865-055
(1) Make sure that these circuit breakers are closed:
(a) P6-1 Electronic System F/O Circuit Breaker Panel 1) N0. 2 AIR DATA AC
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(b) P18 Electronic System Captain Circuit Breaker Panel
1) TAT IND
2) NO. 1 AIR DATA AC
S 865-056
(2)
Align the IRS if it is not already aligned (AMM 34-28-01/201).
S 735-057
(3)
Do these steps to do the DADC test.
(a)
Make sure that all of the annunciators on the MSU are off.
(b)
Set the SYS DSPL switch on the ISDU to the L position.
(c)
Set the DSPL SEL switch on the ISDU to the WIND position. 1) Make sure that the right ISDU display reads 100 |2 knots.
(d)
Open the No. 1 AIR DATA AC circuit breaker on the P18 panel. 1) Make sure that the display on the ISDU turns off. 2) Make sure that the flag on the captain's VSI comes into
view.
(e)
Set the IRS TRANSFER SWITCH on the P5-28 panel to the BOTH ON L position. 1) Make sure that the flag on the first officer's VSI comes
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