TM 55-1510-220-MTF
K40.
Radar range does not vary when RANGE switch is changed to various positions.
a.
Defective radar control-indicator.
K41.
Transponder cannot be interrogated or provides unsatisfactory response.
a.
Mode C not set or defective.
b.
Encoding altimeter defective.
c.
Defective transponder.
d.
Defective antenna.
e.
Defective wiring.
3-38
