Page A2-28
APPENDIX 2
May/12
9107
SERVICE MANUAL
Page A2-28
Oct/11
APPENDIX 2
SERVICE MANUAL
283
ISO 9650
CAUTION:
A VACUUM OF 6 PSI MUST NOT BE EXCEEDED. WORK
QUICKLY THROUGH THE FOLLOWING STEP ONCE
VACUUM IS APPLIED. THE VACUUM MUST NOT BE LEFT
ON FOR EXTENDED PERIODS OF TIME, OTHERWISE
DAMAGE WILL RESULT. IT IS RECOMMENDED THAT
THE H-PACK SHOULD NOT BE SUBJECT TO VACUUM
FOR PERIODS IN EXCESS OF 20 MINUTES.
3.3.5 Record the exact “Start Pressure”. Allow liferaft to remain
undisturbed stand for minimum 5 minutes and record “End Pressure”.
NOTE:
“End pressure” should not be corrected for atmospheric/
temperature fluctuations. During the 5 minute test it is
permissible to temporarily bung the valve body using
either the plug provided with the H-pack, or a clean
rubber bung from a standard Leafield A8 top-up valve.
If using the plug, this will form a reliable temporary seal
when hand-tightened.
3.3.6 Calculate the % gain of pressure (equal to the percentage loss of
vacuum). This is calculated as follows:
%
gain
= 100
{
(Start
Pr
essure
–
End
Pr
essure)
}
Start
Pr
essure
Exploded diagram of vacuum valve
FIGURE A1-33
