TM 55-1510-215-MTF
K27. NAV warning flag on one or both HSI's remains in view when
a VOR/ILS frequency is set on VHF NAV control panel and is
being received.
a.
Defective VHF NAV receiver.
b.
Defective VHF NAV control panel.
c.
Defective navigation junction box.
d.
Defective HSI.
K28. Lateral deviation indicator on one HSI does not deflect properly.
a.
Defective HSI.
b.
Defective HSI select switch panel.
c.
Defective navigation junction box.
K29. Marker beacon indicator lights do not light.
a.
Defective marker beacon light(s).
b.
Defective VHF NAV receiver.
c.
Defective antenna or cabling.
K30. Marker beacon audio not heard in headset.
a.
Defective audio control panel.
b.
Defective MKR SENS switch.
K31. Both glideslope deviation indicators remain flagged when
glideslope is operating.
a.
Defective VHF NAV receiver.
b.
Defective glideslope antenna or cabling.
c.
Defective VHF NAV control panel.
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