(e)
Repeat steps (c) and (d) for T27A bearing switch positions of 90.-TO and 270.-TO with corresponding course counter setting on AP/FD MSP. Check that HSI test displays are the same as in step (c) and (d) and that RMI VOR bearing displays follow signal generator bearing switch settings.
(f)
Check that AP/FD MSP course counters are set to 270.
(g)
Position T27A bearing switch to 270.-FROM. Check that HSI NAV flag is out of view, course deviation bar is centered and to/from indicator points to tail of course arrow.
(h)
Depress T27A TONE switch and check for 1020 Hz tone thru an interphone station with VOR/ILS monitoring.
(i)
Release T27A POWER switch.
(3) ILS Test
(a)
Tune VOR/ILS navigation systems to ILS test frequencies. Check that ADI and HSI glide slope flag and pointers appear, that HSI to/from indicator goes out-of-view, and that RMI VOR bearing pointers stow at 3 o'clock.
(b)
Position T28A Localizer Test Set and T29A Glide Slope Test Set course switches to ON COURSE and extend T28A and T29A antennas.
(c)
Hold both T28A and T29A POWER switches in ON position using switch gang bar. Check that ADI and HSI GS flags and HSI striped NAV flag go out of view and that HSI course deviation bar and ADI and HSI glide slope pointers are centered.
(d)
Position T28A course switch to LEFT and T29A course switch to UP. On ADI and HSI, check that glide slope pointers drive up to second dot and that course deviation bar drives to outer left dot.
EFFECTIVITY
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(e)
Position T28A course switch to RIGHT and T29A course switch to DOWN. On ADI and HSI, check that glide slope pointers drive down to second dot and that course deviation bar drives to outer right dot.
(f)
Position T28A and T29A course switches to ON COURSE. On ADI and HSI, check that course deviation bar and glide slope pointers center.
(g)
Position T28A and T29A delete switches to 90 cycle DELETE. On ADI and HSI, check that course deviation bar drives out past outer left dot, that glide slope pointers drive to full scale up, and that GS and NAV flags appear.
(h)
Position T28A and T29A delete switches to 150 cycle DELETE. On ADI and HSI, check that course deviation bar drives out past outer right dot, that glide slope pointers drive to full scale down, and that GS and NAV flags appear.
(i)
Release T28A and T29A delete switches. On ADI and HSI, check that GS and NAV flags disappear and that glide slope pointers and course deviation bars return to center.
(j)
Release T28A and T29A POWER switches. On ADI and HSI, check that GS and NAV flags appear.
(k)
Turn off equipment and remove electrical power if no longer required.
EFFECTIVITY
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XA 7. __________________
VOR Automatic Test (on LH airplanes only) XA A. VOR-automatic test XA (1) Very phase-modulation portion of the VOR test signal and verify XA data in the following table. Watch for periodic RMI error. XA ~êêê XA Variable Phase Signal RMI Narrow TO-FROM Dev Needle XA (Degrees) Needles (| 3.) XA è”””. XA 0 0 TO Centered XA 45 45 TO Full Right XA 90 90 *[1] Full Right XA XA 135 135 FROM Full Right XA 180 180 FROM Centered XA 225 225 FROM Full Left XA XA 270 270 *[1] Full Left XA 315 315 TO Full Left XA 0 0 TO Centered XA ééé
*[1] To-from swing shall occur between 88 and 92 degrees and between 268 and 272 degrees. XA 8. _________
ILS Tests (on LH airplanes only) XA A. Localizer Test XA (1) Set AP/FD mode selector to LAND, apply 109.10 MHz on course XA localizer signal. Tune frequency on captain's VHF NAV control panel XA to localizer signal and verify that captain's HSI deviation needle XA and ADI deviation pointer are centered. XA (2) Switch on FD. XA (3) Vary signal generator modulation controls to produce a localizer XA deviation test signal which causes a 2-dot fly-right indication on XA captain's HSI. Observe that localizer flag is out of view. XA (4) Slowly decrease test signal modulation to center deviation needle XA on HSI while observing ADI. Note that ADI localizer indication XA comes into view at approximately 1/2-dot deviation on the HSI. XA (5) Verify that LOC and runway flags are out of view. XA (6) Re-center deviation needle. XA (7) Again vary the signal modulation to produce a 2-dot fly-right XA indication on the HSI.
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