PRESSURISATION

Question 1

HOW MANY OUTFLOW VALVES ARE THERE?

Answer 1

TWO: ONE ELECTRO-PNEUMATIC AND ONE PNEUMATIC OUTFLOW VALVES

Question 2

THE PNEUMATIC OUTFLOW VALVE:

Answer 2

IS SLAVED TO THE ELECTRO-PNEUMATIC OUTFLOW VALVE IN AUTOMATIC MODE ONLY

Question 3

IN NORMAL OPERATION, WITHOUT FAILURE, THE DIGITAL CONTROLLER USES AS REFERENCE
THE AIRCRAFT STATIC AIR PRESSURE GENERATED BY:

Answer 3

ADC 1 AND CM 1 ALTIMETER BARO SETTING

Question 4

WHAT ARE THE CORRECT INDICATIONS DURING A PRESSURISATION SYSTEM TEST?

Answer 4

THE AMBER FAULT LIGHT IN THE MAN PB
THE LANDING ELEVATION INDICATOR DISPLAYS ALTERNATIVELY 18800 AND -8800 C)
THE TEST IS INHIBITED IN FLIGHT

Question 5

IF AUTOMATIC PRESSURISATION CONTROL IS DESIRED, IN WHICH POSITION SHOULD THE
“MAN RATE KNOB” BE PLACED:

Answer 5

NORM

Question 6

WHAT DO YOU SET IN “AUTO PRESS PANEL” BEFORE EACH FLIGHT?

Answer 6

LANDING AIRPORT FIELD ELEVATION, USING QNH OR ZERO IF USING QFE

Question 7

HOW HIGH ABOVE TAKE-OFF ELEVATION CAN THE AIRCRAFT BE OPERATED WITHOUT
CANCELLING THE “AUTOMATIC RETURN” FEATURE?

Answer 7

3500 FT ABOVE TAKE-OFF FIELD ELEVATION

Question 8

THE MAXIMUM CABIN RATE OF CLIMB, UP TO 20 000 FT IN AUTO MODE IS

Answer 8

+550 FT/MIN

Question 9

WHAT IS THE MAXIMUM CABIN DIFFERENTIAL PRESSURE?

Answer 9

POSITIVE 6.35 PSI, LIMITED BY A MANOMETRIC CAPSULE
NEGATIVE 0.5 PSI, LIMITED BY A NON-RETURN VALVE

Question 10

WHAT IS THE MAXIMUM NORMAL CABIN ALTITUDE AT FL250?

Answer 10

6 740 FT

Question 11

HOW IS THE SYSTEM PROTECTED AGAINST EXCEEDING THE MAXIMUM CABIN DIFFERENTIAL
PRESSURE?

Answer 11

BOTH OUTFLOW VALVES INCORPORATE A MANOMETRIC CAPSULE (ANEROID) TO HOLD
THE VALVE OPEN SUFFICIENTLY TO PREVENT OVERPRESSURE

Question 12

IN AUTO, WHAT IS THE HIGHEST CABIN RATE OF DESCENT AVAILABLE WITH THE DESCENT
RATE PB RELEASED (NORM):

Answer 12

-400FT/MIN

Question 13

IN AUTO, WHAT IS THE HIGHEST CABIN RATE OF DESCENT AVAILABLE WITH THE DESCENT
RATE PB DEPRESSED (FAST):

Answer 13

-500 FT/MIN

Question 14

BEFORE LANDING TO AVOID A CABIN PRESSURE BUMP AT TOUCH DOWN, THE CABIN
ALTITUDE IS AUTOMATICALLY MAINTAINED AT 300 FT BELOW:

Answer 14

SELECTED LANDING ELEVATION

Question 15

AFTER LANDING THE CABIN PRESSURISATION RATE IS:

Answer 15

+550 FT/MIN

Question 16

IN CASE OF “ADC 1” FAILURE, THE DIGITAL CONTROLLER USES AS REFERENCE AIRCRAFT
STATIC AIR PRESSURE GENERATED BY:

Answer 16

ADC 2 AND 1013 HPA

Question 17

WHAT IS THE CORRECT WAY TO SWITCH FROM AUTOMATIC TO MANUAL OPERATION?

Answer 17

TURN THE CABIN PRESS RATE KNOB TO 9 O’ CLOCK POSITION, SELECT CABIN PRESS PB
AND OPERATE THE MAN RATE KNOB AS REQUIRED

Question 18

IN “MAN MODE” WHAT IS THE HIGHEST CABIN RATE OF DESCENT AND CLIMB AVAILABLE:

Answer 18

-1500FT/MIN; +2500 FT/MIN

Question 19

WHAT IS THE CORRECT WAY TO SWITCH FROM MANUAL TO AUTOMATIC OPERATION?

Answer 19

SELECT MODE SELECT PB TO AUTO AND TURN THE MAN RATE KNOB SMOOTHLY TO
NORMAL POSITION

Question 20

WHAT HAPPENS IN CASE OF LOSS OF ELECTRICAL SUPPLY TO THE “DIGITAL CONTROLLER” IN
AUTOMATIC MODE:

Answer 20

BOTH OUTFLOW VALVES GO TO FULL CLOSE

Question 21

IN CASE OF TOTAL DC ELECTRICAL POWER LOSS:

Answer 21

AUTO PRESS MODE IS LOST
MANUAL PRESS MODE AND CABIN PRESS INDICATIONS ARE STILL AVAILABLE

Question 22

THE FWS IS ACTIVATED WHEN THE CABIN ALTITUDE REACHES:

Answer 22

10 000 FT

Question 23

WHEN IS THE “DUMP” FUNCTION AVAILABLE:

Answer 23

IT ONLY WORKS IN AUTO PRESS MODE

Question 24

HOW MANY OUTFLOW VALVES ARE OPENED IN “DUMP” FUNCTION?

Answer 24

THE PNEUMATIC VALVE
&THE ELECTRO-PNEUMATIC VALVE

Question 25

SELECTING THE “DITCH MODE” WITH THE “DITCH PB”:

Answer 25

TWO ELECTRICAL MOTORS MAINTAIN BOTH OUTFLOW VALVES IN CLOSED POSITION,
REGARDLESS OF AUTO OR MANUAL PRESS MODE USE

IN ADDITION TO THE WHITE LIGHT ON DITCH PB, MASTER CAUTION FLASHES AMBER
AND AIR AMBER LIGHT ILLUMINATES ON FWS