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SOURCE INDICATOR -
ACTIVE CONTROLLER
Comes on (white) to indicate pressurization controller:
PRESSCONT1, or
PRESSCONT2, or
PRESSMAN
Active Controller’s Data
Displayed onECS pageonly.
Monitored Data
Displayed onEICAS
Primary page(MAN)
Status page(AUTO)
ITEM MONITORED DATA(LH) ACTIVE DATA(RH)
GREEN AMBER RED AMBER (------) WHITE AMBER (------)
CALT Less than 8,500 feet More than 8,500 but less than 10,000 feet More than 10,000 feet Invalid Data Increments of 100 feet Invalid Data
RATE Positive/ negative rates at 100 fpm
Invalid Data Positive/ negative rates at 100 fpm Invalid Data
P Less than 8.65 psi
More than 8.65 psi Invalid Data Increments of 0.1 psi Invalid Data
LDG ELEV
Increments of 20 feet (cyan) Invalid Data
Data measured by the monitoring source (CPAM, PRESS CONT 1, PRESS CONT 2) Data measured by the active controller (PRESS CONT 1, PRESS CONT 2)
Pressurization Synoptic Page Indications
Figure 08---60---4
Flight Crew Operating Manual MASTER
CSP A-
013
ENVIRONMENTAL CONTROL SYSTEM Vol. 1 08-
60-
7
Pressurization System REV 56, Jan 31/03
2. OUTFLOW VALVES
The dual, redundant, electro-
pneumatic outflow valves are installed on the rear pressure bulkhead,belowfloor level, andare designated astheprimaryand secondary valves. Both valves are slavedtogetherthrough apneumatic line andare electrically controlled. The valves willrespondtoeitherelectrical signals in automatic mode, ortopneumatic input signals from the manualregulators on theCABINPRESS controlpanel.
3. CABIN PRESSURE CONTROLLERS
The aircraftis equipped withdual, redundantpressure controllers, whichoperateonlyin automatic mode. All controller outputsare senttotheoutflowvalves. While onecontroller is in use,the otherupdatesautomatically. The active cabin pressure controller commandsthe outflowvalve to anominaldifferentialpressure of8.33psid. Inputsto thepressure controllers are receivedfrom air datacomputer(ADC1)normally. ADC2is thebackupto ADC1. If acontroller fails,the system willautomaticallyswitch over to the other controller. If automaticswitch-
over fails, selectthe PRESSCONTROL switchtwice. Thiswillenable theredundant controller. Ifbothpressure controllers fail, bothoutflow valves willgo to an isobaric hold mode.When the airplane is onthegroundfor3 minutes, automatic pressure controllerswitch-
over willoccur.
The pressurization system automatically maintains cabin pressure throughallphasesof flight. Typicalvalues usedin thecabin/flightaltitude schedule during manual mode are as follows:
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