TM 55-1510-215-MTF
K49. Pilot's or copilot's HSI does not display TACAN data.
a.
Defective HSI select switch panel.
b.
Defective navigation junction box.
K50. No TACAN audio heard in headsets.
a.
Defective TACAN receiver-transmitter.
b.
Defective TACAN control panel.
c.
Defective audio control panel.
d.
Defective antenna or cabling.
K51. TACAN gives improper indications in air-to-air mode.
a.
Defective TAC A/A switch.
b. Defective wiring between TAC A/A switch and
TACAN receiver-transmitter.
c.
Defective TACAN receiver-transmitter.
K52. INS inoperative.
a.
Defective circuit breaker or INS interface unit.
NOTE
INS malfunction codes and corrective actions are
listed in TM 55-1510-215-10-2.
K53. MLS fails self-test.
a.
Defective wiring.
b.
Defective control-display.
3-48
