T-45C TS, ADV & IUT ENG-22
CNI System Malfunctions
3. Effects on flight safety
a. If undetected, an ILS localizer failure can lead to
serious navigation errors during approach
b. May require missed approach procedure
c. ILS and localizer approach capability lost
H. Marker beacon failure 1.8.1.9.11.1
1. Indications: no associated lights or aural tones
2. Verifications
a. Verify with aft seat, if available
b. Verify with other aircraft, if available
c. Check status of beacon with ATC
d. Check marker beacon light bulbs with MASTER
TEST switch
3. Effects on flight safety
a. A failed marker beacon will degrade most ILS and
LOC approaches
b. A failed marker beacon may preclude an ILS or LOC
approach
c. Possible position disorientation during approach
Original (9-98)
Page 22-15
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