TM 55-1510-215-MTF
K54. MLS/DME annunciator does not come on when MLS
selected on HSI select switch panel or will not reset.
a.
Defective annunciator.
b.
Defective DC junction box.
K55. MLS data cannot be displayed on selected HSI.
a.
Defective HSI select switch panel.
b.
Defective navigation junction box No. 1.
c.
Defective receiver.
K56. MLS display field will not illuminate.
a.
Defective control-display.
b.
Defective lighting junction box.
c.
Defective lighting inverter.
K57. No MLS audio.
a.
Defective audio amplifier.
b.
Defective nonsecure audio junction box.
c.
Defective control-display.
d.
Defective receiver.
e.
Defective antenna or cabling.
K58. FMS inoperative.
a.
Defective circuit breaker.
b.
Defective control-display.
c.
Defective computer.
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