TM 1-1520-238-T-5
7–120
7–39.
TAIL WHEEL ADVISORY LIGHT – IS NOT LIGHTED (cont)
7–39
7. Check for open between HP5–A and HP5–B.
Does open exist?
YES
Replace tail wheel lock control
valve (TM 1-1520-238-23).
NO
Go to step 8.
8. Check for open between P760–3 and ground.
Does open exist?
YES
Repair open wire between:
P760–3 and GS690–K.
Go to paragraph 7–21.
NO
Go to step 9.
9. Check for 28 VDC at P760–1.
Is voltage present?
YES
Go to step 10.
NO
Repair open wire between
P760–1 and (A402)TB2–9–B.
Go to paragraph 7–21.
10. Detach wire at XK34–A1.
Check for 28 VDC at XK34–A1.
Is voltage present?
YES
Repair open wire between:
XK34–A1 and P748–C.
Go to paragraph 7–21.
NO
Go to step 11.
11. Check for 300 to 340 ohms resistance between:
K34–X1 and K34–X2.
Is resistance present?
YES
Go to step 12.
NO
Replace relay K34.
(TM 1-1520-238-23).
12. Check for open between:
XK34–A2 and P760–1,
XK34–X1 and P760–1,
XK34–X2 and P760–2.
Does open exist?
YES
Repair open wire.
Go to paragraph 7–21.
NO
Replace tail wheel lock proximity
switch. (TM 1-1520-238-23).
END OF TASK
