TM 1-1520-238-T-7
11–418
Change 5
11–120. AUDIO TONE – IS NOT HEARD IN BOTH CREW STATIONS
11–120
Tools:
Nomenclature
Part Number
Tool Kit, Electrical
SC518099CLA06
Repairer’s
Multimeter, Digital
AN/PSM-45
Extractor, Relay
CTJ-RO6
Personnel Required:
68X
Armament/Electrical Systems Repairer
One person to assist
References:
TM 1-1520-238-T-6
TM 1-1520-238-23
TM 11-1520-238-23-2
Equipment Conditions:
Ref
Condition
TM 1-1520-238-23
Access provisions –
L200 cover removed
and L295 and L325
doors open
WARNING
Turn off power before detaching or
attaching wires and connectors. High
current 28 VDC or 115 VAC is present.
Failure to do so could result in death or
serious injury.
1. Open ENG WARN (A76)CB52 circuit breaker.
Detach:
P447 from J447,
P1077 from (A329)J1,
P491 from (A323)J6.
Check for open between:
P49–23 and P435–A5,
(A326)J7–A5 and (A326)TB1–10–G,
(A326)TB1–10–H and (A326)J2–A12,
P469–A12 and and J447–B6,
P447–B6 and P1077–M,
(A329)J1–M and (A329)XK1–8–B3,
(A329)XK1–8–B2 and (A329)J1–B,
P1077–B and P491–A4,
(A323)J6–A4 and (A323)TB2–2–H.
Does open exist?
YES
Repair open wire.
Go to paragraph 11–88.
NO
Go to step 2.
2. Check for continuity between (A329):
XK1–8–B2 and XK1–8–B3.
Does continuity exist?
YES
Go to step 3.
NO
Replace APPROACH 2 AUDIO
relay (A329)K1–8
(TM 1-1520-238-23).
3. Close ENG WARN (A76)CB52 circuit breaker.
Check for continuity between P49–26 and
ground.
Does continuity exist?
YES
Go to step 4.
NO
Refer to TM 1-1520-238-T-6 to
troubleshoot engine out warning
system.
