PRESSURISATION Flashcards
HOW DOES PRESS WORK
CABIN AIR PRESS REGULATION IS DONE VIA THE AUTO CONTROL OF THE OUTFLOW VALVES DURING ALL FLT PHASES
HOW MANY OUTFLOW VALVES
4 OUTFLOW VALVES
2 FWD 2 AFT
EACH OUTFLOW VLV DRIVEN BY SINGLE ELEC MOTOR
HOW MANY OUTFLOW VLV CONTROLLERS
4 OUTFLOW VLV CONTROLLERS
ONE FOR EACH OUTFLOW VLV
OPERATE IN AUTO MODE BACKUP OR MANUAL
OUTFLOW VLV CONTROLLER
AUTO MODE
ALL 4 AUTO MANAGE CABIN ALT AND CABIN V/S
IF AUTO MODE OF 3 FAIL 1 CAN STILL CONTROL ALL OUTFLOW VLV
OUTFLOW VLV CONTROLLERS RECEIVES DATA FROM
AFDX NETWORK FMS FLT PLAN NAV SYS ADIRS LDG GEAR ENGINES AIRCOND DOORS
PSI FOR TAKEOFF AND CRZ
AUTO MODE
TAKEOFF 0.1 PSI
CRZ APPROX 8 PSI
AUTO OUTFLW VLV CTL
BEFORE TAKEOFF ROLL
ALL OUTFLW VLV OPEN TO MAKE SURE THAT THERE IS NO DIFFERENTIAL PRESS BETWEEN THE INSIDE AND OUTSIDE OF THE AIRCRAFT
AUTO CTL MODE OUTFLW VLV CNTRLR
DURING TAKEOFF ROLL
4 OUTFLW VLV CONTROLLERS PRESSURISE THE AIRCRAFT TO PROVIDE A SMOOTH VARIATION OF THE CABIN V/S AFTER LIFTOFF
DURING CLIMB IN NAV
CLIMB ALT PROFILE AND VS FUNCTION OF AIRCRAFT FLT PROFILE
DURING CLIMB HDG
CABIN ALT AND VS FUNCTION OF AIRCRAFT ALT AND VS
CABIN VS LIMITED 1000fpm
CRUISE CABIN ALT
APPROX < 7500’
DIFF PRESS 8 PSI
CABIN ALT FOR DES
CABIN VS CONTROLLED TO MAKE SURE THAT THE CABIN ALT REACHES AN ALT SLIGHTLY BELOW LDG FIELD ELEV PRIOR LDG
CABIN VS LIMITED -300fpm FOR DESCENT
AFTER LDG
WHAT HAPPENS OUTFLW VLV
ALL OUTFLOW VLV OPEN
IF ALL OUTFLW VLV CONTROLLERS FAIL
CAN BE OPERATED IN MANUAL MODE
FMS DATA IS LOST
USE CABIN PRESS INFO FROM ASSIGNED PRESS SENSORS AND EXTERNAL PRESS INFO
CABIN VS
MANUAL
ONLY USED SMOKE FUMES REMOVAL