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LTL TATM LTL - Vol 1
Issue 1.0
31
Helium Venting Procedures – Sheet 1
Helium Overfill Indications
:
-
low ballonet
-
high freelift
-
high helium temperature
-
high helium pressure
Before venting
Measure ballonet height and record (with balloon in low moored position)
Unmoor balloon in calm conditions
Connect battery charger to maintain power
Record unladen freelift, temperatures and pressures
Turn panel key to ‘UNLOCK’
Ballonet fan switch to ‘AUTO’
Manual Helium Valve Operation
OBSERVER TO COUNTDOWN ‘OPEN’ TIME AND MONITOR FREELIFT
OPERATOR TO CONTROL HELIUM VALVE SWITCHES
PRESS TO TEST HELIUM VALVE INDICATOR LIGHTS
L.H. HELIUM SWITCH UP TO ‘MANUAL’
R.H. HELIUM SWITCH UP TO ‘OPEN’
RED INDICATOR LIGHT ‘ON’
COUNTDOWN – 6 SECONDS
R.H. HELIUM SWITCH DOWN TO ‘CLOSE’
RED INDICATOR ‘OFF’ AFTER 4 SECONDS TRAVEL TIME
*
L.H. HELIUM SWITCH TO ‘AUTO’