Laversab 6600 User Manual page 14

Caution: Before opening the "Ps1 Vent" valve, both the "Ps2 Vent" and "Pt Vent"
valves must be completely open.
Caution: Do not over-tighten the valve as this may damage the seat of the valve.
[12] Secondary Static Vent (Ps2 Vent) :
In the event that the 6600 is in-operable due to a malfunction or due to loss of power, it is
possible to vent the Ps2 system manually. This is done using the metering valve labeled "Ps2
Vent". This valve is a positive shut-off valve. Opening this valve slowly will cross-bleed the
Ps2 output to the Ps1 output of the 6600. While venting, care must be taken to ensure that the
maximum climb rate of the aircraft connected to the tester is not exceeded. Also, the "Pt
Vent" may need to be used to maintain the airspeed within limits of the indicator on the
aircraft.
The Secondary Static (Ps2) and Pitot (Pt) ports are referenced to the Primary Static (Ps1) port.
The "Ps2 Vent" and "Pt Vent" valves are used to cross-bleed to the Primary Static (Ps1) ports.
Therefore the manual vent valves must be opened in sequence. First open the "Ps2 Vent"
valve, then the "Pt Vent" valve and last, the "Ps1 Vent" valve.
Caution: Before opening the "Ps1 Vent" valve, both the "Ps2 Vent" and "Pt Vent"
valves must be completely open.
Caution: Do not over-tighten the valve as this may damage the seat of the valve.
[13] Pitot Vent (Pt Vent) :
In the event that the 6600 is in-operable due to a malfunction or due to loss of power, it is
possible to vent the Pitot system manually. This is done using the metering valve labeled "Pt
Vent". This valve is a positive shut-off valve. Opening this valve slowly will cross-bleed the
Pt output to the Ps1 output of the 6600. While venting, care must be taken to maintain the
airspeed within limits of the indicator on the aircraft.
The Secondary Static (Ps2) and Pitot (Pt) ports are referenced to the Primary Static (Ps1) port.
The "Ps2 Vent" and "Pt Vent" valves are used to cross-bleed to the Primary Static (Ps1) ports.
Therefore the manual vent valves must be opened in sequence. First open the "Ps2 Vent"
valve, then the "Pt Vent" valve and last, the "Ps1 Vent" valve.
Caution: Before opening the "Ps1 Vent" valve, both the "Ps2 Vent" and "Pt Vent"
valves must be completely open.
Caution: Do not over-tighten the valve as this may damage the seat of the valve.
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