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Penny+6iles1:;;'Jl!~~m~jf~,rli\.~'#.ftWtm¥t~MW4l~;\~,{'4~·1;.~·),!J,~IVAvionics SystemsDivisionThe value of the last vent level (ie: QFE) is stored withinthe unit. When a new vent is selected, the system firstvents to the last recorded figure. If the new QFE reading isdifferent from the stored value, the system will slowly alterthe pressures in the lines until internal and externalpressures are matched, and the unit is vented.As in the main menu, the "status" line indicates when thesystem is vented.Page 24PUB. 12119 May 1989
PennyfGilesI ". . :''J:I'NN!'jp.:-· ,,',(...ggE¥iS&~'f,i;.;,:,."\;i.::-· ':" -",' : 7Avionics SystemsDivision4.6 MAIN MENU KEY 6 - Leak Check Pressure LinesLeak checks may be carried out at any time, and at anypressures within the limits previously defined.The units displayed with the leak routine are controlled viaKey 3, "Selection of Units", in the main menu. The displayedleak-rate units are dependant upon the units selected asfollows:-PARAMETER UNITS SELECTED LEAK-RATE UNITSfeetfeet/minmm/minAltitude rob rob/mininHginHg/minpsipsi/minknotsknots/minkm/hrkm/h/minAirspeed rob rob/mininHginHg/minpsipsi/minA rapid indication as to the existence of any leakage may beobtained by selecting 4 on the main menu and entering theMeasure-Only-Mode, which will allow the monitoring ofpressure within the system.NOTE: During Leak Checks, including Measure-Only-Mode use,with altitudes above ground level, ensure that anominal positive airspeed (say 100kn) is present toavoid the possibility of Airspeed out-of-rangeconditions arising. Alternatively, engage Fixed-Wingrange, as shown in Section 4.7.3 below, to minimisethe effect.19 May 1989Rev: 1 10 Dec 1990PUB 121Page 25
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