PART III - AIRPLANE LEAK DOWN (NO PACK OPERATION)
CABIN TEMPERATURE ______________________________
TIME CABIN CABIN (SECONDS) (PSID) (RATE OF CHANGE)
4.5 -
10 ________ ______________
20 ________ ______________
30 ________ ______________
40 ________ ______________
50 ________ ______________
60 ________ ______________
70 ________ ______________
80 ________ ______________
90
________ ______________
100 ________ ______________
110 ________ ______________
120 ________ ______________
PRESSURE DIFFERENTIAL - PSID
4 -
3.5 -
3 -
2.5 -
2 -
1.5 -
TIME - SECONDS
Airplane Dispatch with Single Pack Operation -Confidence Check - Data Sheet
Figure 202
K19393
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S 862-004
(3) Do these steps on the Flight Management Computer (FMC) to display
the FMCS ANALOG page 1/4:
(a) Press the INIT REF function key on the CDU front panel.
(b) Push the LSK adjacent to <INDEX (LSK 6L) to show the INIT REF
INDEX 1/1 page.
(c) Push the LSK adjacent to MAINT> (LSK 6R) to show the MAINT BITE
INDEX page.
(d) Push the LSK adjacent to <FMCS (LSK 1L) to show the FMCS BITE
1/1 page.
(e) Push the LSK adjacent to <DISCRETES (LSK 4L) to show the FMCS
ANALOG DISC 1/4 page.
(f) Use the ECS PACK H/L (high flow, low flow) line entry on the
ANALOG DISC 1/4 page.
(g) The following information can be displayed on the FMC:
LEFT RIGHT
ECS PACK ON OFF
ECS PACK H/L LO HI
ISOLATION VALVE OPEN(CLOSED)
1) ECS PACK indicates if the left or right pack is on or off.
ECS PACK H/L indicates the pack is in the low flow mode or
if it has been commanded to the high flow mode. A pack can
be commanded to the high flow mode even if it is off.
ISOLATION VALVE indicates if the valve is open or closed.
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(4) Supply electrical power (AMM 24-22-00/201).
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(5) Set the RECIRC FAN switch on the air conditioning panel to AUTO.
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(6) Position the ISOLATION VALVE valve to OPEN.
S 712-007
(7) Do these steps to make sure the pack flow control and shutoff valves
operate correctly:
(a) Supply pneumatic pressure with the APU (AMM 36-05-00/201).
(b) Put the APU BLEED switch on the air conditioning panel to ON.
(c) Set the L and R PACK switches on the air conditioning panel to
AUTO.
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737-300/400/500MAINTENANCE MANUAL
(d) Disconnect the electrical connectors D454 and D500 from the left and right turbofan valves, respectively, in the air conditioning bays (AMM 21-52-71/401).
NOTE: The disconnection of the electrical connectors will
____ allow the turbofans to operate continuously with the flaps up and allow the packs to switch between "HIGH" and "LOW" flow. If the turbofans are not in operation, the packs will shut off when the pack protection switches overheat due to lack of air flow through the heat exchangers.
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