(b)  
Set the L and R mode selectors on the mode select unit (MSU) to the ATT position.

 (c)  
Set the DSPL switch on the inertial systems display unit (ISDU) to the HDG/STS position.

 (d)  
Push and release the H key on the ISDU.

 (e)  
Put a heading of 000 degrees into the ISDU. 1) Make sure the two EHSIs show HDG, 000, and MAG.

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737-300/400/500MAINTENANCE MANUAL
 2)  Make sure the compass cards for the two RDDMIs read 000 degrees.
 NOTE: The pointers for the two RDDMIs must agree.
____

Set up the ramp test set to simulate a 0° bearing signal with a modulation of 1020Hz at a frequency of 108.00MHz.
 NOTE: When using the Instrument Flight Research NAV-401L test
____ set, the "to/from" switch must be in the "to" position.
Make sure there is no VOR sound heard when the test set and the
 receiver are tuned to different frequencies.
Make sure the compass system shows the airplanes heading.
Set a frequency of 108.0 MHz on the No. 1 VHF NAV control
 panel.
 1) Make sure the narrow pointer flags in the two RDDMIs are

 out of view. 2) Make sure the narrow pointers in the two RDDMIs show 000 |4 degrees. 3) Make sure the course deviation bar and scale show on the
 captain's EHSI.Turn the captain's course knob until the course deviation bar on the EHSI is in the center. 1) Make sure the course counter on the captain's EHSI shows
 000 |2 degrees. 2) Make sure the captain's EHSI shows TO. 3) Make sure the course deviation bar on the captain's EHSI is
 parallel to the narrow pointers in the two RDDMIs.Turn the captain's course knob until the course deviation bar is on the second dot in the left direction. 1) Make sure the course counter shows 010 |4 degrees.Turn the captain's course knob until the course deviation bar is on the second dot in the right direction. 1) Make sure the course counter shows 350 |4 degrees.Turn the captain's course knob until the course counter shows 000 degrees.Set the VOR bearing selector on the ramp test set to the radials shown in Table 502. 1) Make sure the narrow pointers in the two RDDMIs and the
 displays in the captain's EHSI agree with Table 502.
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 ~............................................................................... | Table 502 | ................................................................................. | SIMULATED VOR | POINTER | TO-FROM | COURSE | | BEARING FROM | ON | DISPLAY | DEVIATION BAR | | TEST SET | THE RDDMI | ON THE EHSI | ON THE EHSI | ................................................................................. | 180° | 180 + 4° | FROM | Centered | ................................................................................. | 135° | 135 + 4° | FROM | Full scale right | ................................................................................. | 90° | 90 | 4° | *[1] | Full scale right | ................................................................................. | 45° | 45 | 4° | TO | Full scale right | ................................................................................. | 000° | 000 | 4° | TO | Centered | ................................................................................. | 315° | 315 | 4° | TO | Full scale left | ................................................................................. | 270° | 270 | 4° | *[1] | Full scale left | ................................................................................. | 225° | 225 + 4° | FROM | Full scale left | ................................................................................. | 180° | 180 + 4° | FROM | Centered | ................................................................................. | 225° | 225 | 4° | FROM | Full scale left | ................................................................................. | 270° | 270 | 4° | *[1] | Full scale left | ................................................................................. | 315° | 315 | 4° | TO | Full scale left | ................................................................................. | 000° | 000 + 4° | TO | Centered | ................................................................................. | 45° | 45 | 4° | TO | Full scale right | ................................................................................. | 90° | 90 | 4° | *[1] | Full scale right | ................................................................................. | 135° | 135 | 4° | FROM | Full scale right | ................................................................................. | 180° | 180 + 4° | FROM | Centered | 2...................….....................….................…...................1
　
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