TM5-4220-231-14&P
TROUBLESHOOTING- (Con't)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE
ACTION
3. DACC SECONDARY
AIR SUPPLY SIDE MALFUNCTIONS.
Step 1. Ensure
HP air is reaching
the DACC by opening
HP supply valve on DASS.
Step 2. Open secondary
side HP inlet valve on DACC, and observe
the HP IN gage
reading on the
secondary
air supply side of the DACC. The gage should read the same
as the HP gage on
the DASS.
If not, check the HP IN Gage
Isolation valve for the Secondary
HP Supply side
of the
DACC.
Open
isolation valve.
If HP IN gage on the DACC Secondary
HP supply side still does not register the same
pressure
as the HP gage on the DASS, the secondary
side HP IN gage on the DACC is
faulty.
Replace
HP IN gage.
If the HP IN gage indicates
normal operating
pressure,
go to Step 3.
Step 3. Open
regulator
1/4 turn, and read LP OUT gage on Secondary
side of DACC.
Check
secondary
HP Supply side LP OUT Gage
Isolation valve on DACC.
Open isolation valve.
If LP OUT gage does not indicate normal operating
pressure,
either the regulator
is faulty
or the LP OUT gage is faulty.
Go to Step 4.
Step 4. To test Secondary
HP Supply side LP OUT gage on the DACC, open LP OUT valve and read
LP pressure
gage on VTA panel.
If LP gage on the VTA panel indicates
pressure,
but LP OUT gage on the Secondary
HP
Supply side of the DACC still indicates
no pressure,
LP OUT gage on DACC is faulty.
Replace
LP OUT gage.
If gage on VTA does
not indicate
pressure,
the regulator
on DACC is faulty.
Request
intermediate
direct support.
If LP gage indicates
normal operating
pressure,
go to Step 5.
Step 5. Open LP OUT valve on the DACC Secondary
HP Supply side.
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