Section Il. OPERATION UNDER UNUSUAL CONDITIONS
2-4. Preliminary Starting Procedure
b. MAG-DG toggle switch should be set to
The appropriate neutral positions for the test set
c. HDG rotary switch should be set to 0.
controls are as follows:
a. Power ON-OFF toggle switch should be set to
Toggle switch (DPDT); connects input power to test set circuitry.
ON-OFF switch S1
Toggle switch (SPDT); permits Directional Gyro CN-988(*) / ASN to be
D C - M A C switch S2
operated in the earth-rate-corrected, free-gyro (DG) mode, or in the
magnetically slaved (MAG) mode.
Controls test set magnetic heading simulator three-wire output. Selects
HDG switch S3
simulated magnetic heading outputs from 0 degrees through 330 degrees in
a. Connect test set cable W1 to 115Vac, 400Hz
No initial adjustments are required on the test set.
b. Set ON-OFF switch to ON and observe that
lamp DS1 lights.
The operating procedure for the test set when
C. Set ON-OFF switch to OFF, then attach test
checking Gyromagnetic Compass Set AN / ASN-
set cables to AN / ASN-43 components and in-
43 in a system is as follows:
dicator (ID-998(*)/ ASN or ID-1351 / A).