TM 1-1520-238-T-7
11–422
Change 5
11–122. NOE/APRCH SWITCH – DISENGAGES OR STAB POS INDICATORS DO NOT
11–122
INDICATE 25 2 (cont)
5. Apply 28 VDC to (A137) J1–A1 and 28 VDC
return to (A137) J1–B2.
Set NOE/APRCH switch to NOE/APRCH.
Remove pilot ASE panel (A137) for J1–B7 (HI)
and J1–B2 (LO) voltage measurement.
Check for 28 VDC between (A137) J1–B7 (HI)
and J1–B2 (LO).
Does NOE/APRCH switch remain set and is
voltage present?
YES
Go to step 6.
NO
Replace pilot ASE panel (A137)
(TM 1-1520-238-23).
6. Detach:
P990 from (A638)J2,
P986 from (A637)J2.
Check for short between P170–B7 and ground.
Does short exist?
YES
Repair shorted wire between:
P170–B7 and J447–A11,
P447–A11 and P485–B,
(A323)J7–B and
(A323)TB2–2–C,
(A323)TB2–2–F and
(A323)J7–C,
(A323)TB2–2–J and
(A323)J7–D,
P485–C and P990–S,
P485–D and P986–S.
Go to paragraph 11–88.
NO
Replace STAB CONT UNIT 1
(A637) or
STAB CONT UNIT 2 (A638)
(TM 1-1520-238-23).
END OF TASK
Paragraph 11–123 deleted
